CN110564431A - Wet garbage dehydration pyrolysis method and system - Google Patents
Wet garbage dehydration pyrolysis method and system Download PDFInfo
- Publication number
- CN110564431A CN110564431A CN201910853529.0A CN201910853529A CN110564431A CN 110564431 A CN110564431 A CN 110564431A CN 201910853529 A CN201910853529 A CN 201910853529A CN 110564431 A CN110564431 A CN 110564431A
- Authority
- CN
- China
- Prior art keywords
- dehydration
- pyrolysis
- extrusion
- flue gas
- treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000018044 dehydration Effects 0.000 title claims abstract description 353
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 353
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 233
- 239000010813 municipal solid waste Substances 0.000 title claims abstract description 183
- 238000000034 method Methods 0.000 title claims abstract description 84
- 208000005156 Dehydration Diseases 0.000 claims abstract description 352
- 238000001125 extrusion Methods 0.000 claims abstract description 204
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 125
- 239000000126 substance Substances 0.000 claims abstract description 100
- 239000007790 solid phase Substances 0.000 claims abstract description 72
- 238000001704 evaporation Methods 0.000 claims abstract description 67
- 239000012071 phase Substances 0.000 claims abstract description 38
- 239000007791 liquid phase Substances 0.000 claims abstract description 31
- 238000009833 condensation Methods 0.000 claims abstract description 28
- 230000005494 condensation Effects 0.000 claims abstract description 28
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 151
- 239000003546 flue gas Substances 0.000 claims description 148
- 239000007789 gas Substances 0.000 claims description 80
- 238000010438 heat treatment Methods 0.000 claims description 34
- 239000002699 waste material Substances 0.000 claims description 27
- 239000002918 waste heat Substances 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 24
- 239000002912 waste gas Substances 0.000 claims description 19
- 238000005485 electric heating Methods 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 description 16
- 239000002296 pyrolytic carbon Substances 0.000 description 14
- 239000000779 smoke Substances 0.000 description 13
- 208000028659 discharge Diseases 0.000 description 12
- 239000002351 wastewater Substances 0.000 description 11
- 238000003763 carbonization Methods 0.000 description 10
- 239000000446 fuel Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 238000000855 fermentation Methods 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- 244000025254 Cannabis sativa Species 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 239000004509 smoke generator Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000009264 composting Methods 0.000 description 3
- 238000004332 deodorization Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007792 gaseous phase Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001192 hot extrusion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/16—Features of high-temperature carbonising processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/14—Drying solid materials or objects by processes not involving the application of heat by applying pressure, e.g. wringing; by brushing; by wiping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method and a system for dehydrating and pyrolyzing wet garbage. The method comprises the following steps: 1) extruding the wet garbage, wherein the temperature condition of the extrusion treatment is 85-101 ℃, and the extrusion pressure condition is 5-10 MPa; 2) further improving the extrusion pressure condition to be more than 10MPa, and completing primary dehydration treatment to provide a solid phase substance obtained by primary dehydration and a liquid phase substance obtained by primary dehydration; 3) carrying out pressure relief treatment on the dehydration system subjected to primary dehydration treatment to provide a solid phase substance obtained by secondary dehydration and exhaust gas, and carrying out condensation treatment on the exhaust gas to provide first self-evaporation condensed water; 4) carrying out tertiary dehydration on the solid phase substance obtained by the secondary dehydration to provide a solid phase substance obtained by the tertiary dehydration and a gas phase substance obtained by the tertiary dehydration; 5) condensing the gas phase obtained by the third dehydration to provide second self-evaporation condensed water; 6) and carrying out pyrolysis treatment on the solid phase obtained by the three times of dehydration. The invention reduces the water content of the wet garbage after treatment to below 50 percent.
Description
Technical Field
the invention relates to the field of garbage disposal and recycling, in particular to a method and a system for dehydrating and pyrolyzing wet garbage.
Background
in 2019, 2 months, the residential housing and urban and rural construction department have held a national city domestic garbage classification conference in the Shanghai, and it is required that from 2019, cities on the national level and above need to start the domestic garbage classification work comprehensively; by the end of 2020, 46 major cities in the country are basically built into a 'garbage classification' treatment system; before 2025, the treatment system of garbage classification is built in cities at the national level and above. The housing and the urban and rural construction department show that the 46 major cities firstly try to collect, transport and process supporting facilities by 'garbage classification'. A household garbage classification collection, transportation and treatment system is firstly implemented in the Shanghai from 7/1/2019, and the garbage is divided into recoverable garbage, harmful garbage, dry garbage and wet garbage to be respectively treated.
However, once all wet garbage which is sent to the garbage incinerator in the past is separately collected, the transportation cost is high, the disposal difficulty is high, anaerobic fermentation or aerobic composting needs to be carried out after concentration, the traditional large-scale wet garbage disposal technology is not suitable for garbage disposal of all cities, and the transportation distance of the separate wet garbage anaerobic fermentation or aerobic composting in some cities is long, and the transportation cost is high.
at present, after a plurality of urban incineration facilities are built, wet garbage is dehydrated and dried and then is incinerated together with dry garbage, and the transportation energy consumption is reduced after the dehydration and drying. In addition, in many cities, the construction of large incineration plants is not suitable because the total garbage yield is only below 400t/d, but the construction of separate wet garbage anaerobic fermentation or aerobic composting is not suitable. Therefore, the method for pyrolyzing the dewatered wet garbage together with the dry garbage is the most practical method, and a simple, economical and applicable wet garbage dewatering and drying treatment facility easy to operate is needed to meet the requirement of direct pyrolysis together with the dry garbage after dewatering and drying.
Most of the existing extrusion dehydration devices utilize pure extrusion dehydration, such as a screw extrusion dehydrator and a hydraulic dehydrator, which are widely applied to dehydration operation before drying of high-humidity residue materials. However, when all the extrusion dewatering is used for wet garbage, on one hand, the moisture content is difficult to be reduced to below 50%, and the moisture content of the dewatered wet garbage can not be reduced to the moisture content entering a pyrolysis furnace. On the other hand, the use of very high dewatering pressures will extrude large amounts of "sludges", so that part of the solids is also extruded, leading to difficulties in working up.
The existing wet garbage drying and dehydrating device also uses a heat medium (steam or hot air) to evaporate water, but has high energy consumption and long time.
In addition, the problems of difficult odor control, large field odor and the like in the wet garbage dehydration in the prior art are also existed; the existing wet garbage pyrolysis has the problems of high water evaporation energy consumption, energy failure in self-balancing and the like.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a convenient, simple, economical and efficient method and system for wet waste dehydropyrolysis.
The purpose of the invention can be realized by the following technical scheme: the invention provides a wet garbage dehydration pyrolysis method, which comprises the following steps:
1) Extruding the wet garbage, wherein the temperature condition of the extrusion treatment is 85-101 ℃, the extrusion pressure condition is 5-10MPa, and the time is 10-20 min;
2) Further improving the extrusion pressure condition to be more than 10MPa, and completing primary dehydration treatment to provide a solid phase substance obtained by primary dehydration and a liquid phase substance obtained by primary dehydration;
3) Carrying out pressure relief treatment on the dehydration system subjected to the primary dehydration treatment to provide a solid phase substance obtained by secondary dehydration and exhaust gas, and carrying out condensation treatment on the exhaust gas to provide first self-evaporation condensed water;
4) Carrying out tertiary dehydration on the solid phase substance obtained by the secondary dehydration in the step 3) to provide a solid phase substance obtained by the tertiary dehydration and a gas phase substance (14) obtained by the tertiary dehydration, wherein the pressure condition of the tertiary dehydration is normal pressure;
5) Condensing the gas phase obtained by the third dehydration in the step 4) to provide second self-evaporation condensed water;
6) Carrying out pyrolysis treatment on the solid phase substance obtained by the three times of dehydration provided by the step 4).
in some embodiments of the invention, at least a portion of the flue gas generated in the pyrolysis system of step 6) is used to warm the wet waste to 85-101 ℃.
in some embodiments of the invention, at least a portion of the steam 6 generated in the pyrolysis system of step 6) is used to warm the wet waste to 85-101 ℃.
In some embodiments of the invention, the press dewatering system heats the wet waste to 85-101 ℃ by electric heating or heat transfer oil heating.
in some embodiments of the present invention, the squeezing dewatering system achieves a squeezing pressure of the wet garbage of 5-10MPa or more by hydraulic or screw squeezing.
in some embodiments of the invention, one or more of the following technical features are also included:
A1) carrying out anaerobic treatment on the liquid phase substance obtained by the primary dehydration;
A2) Recycling the drained water after the first self-evaporation condensed water and the second self-evaporation condensed water;
A3) when the temperature of the flue gas generated in the pyrolysis system is increased, the waste gas discharged by the extrusion dehydration system in the temperature increasing process is condensed and then treated by the generated flue gas.
In another aspect of the present invention, a wet garbage hydrothermal desorption system is provided, which includes:
the extrusion dehydration device is used for carrying out extrusion treatment and primary dehydration treatment on the wet garbage to provide a solid-phase substance obtained by primary dehydration and a liquid-phase substance obtained by primary dehydration, and carrying out pressure relief treatment on the extrusion dehydration device after the primary dehydration treatment to provide a solid-phase substance obtained by secondary dehydration and exhaust gas;
A vacuum suction device for performing suction treatment on the solid phase substance obtained by the secondary dehydration to provide a solid phase substance obtained by the tertiary dehydration and a gas phase substance obtained by the tertiary dehydration;
the condensing device is used for condensing the exhaust gas in the pressure relief process in the extrusion dehydration device after the primary dehydration and the gas phase obtained by the tertiary dehydration;
And the pyrolysis device is used for carrying out pyrolysis treatment on the solid-phase substance obtained by the three times of dehydration.
In some embodiments of the invention, the vacuum suction device is in communication with the discharge end of the press dewatering device; the condensing device is in fluid communication with the press dewatering device, and the vacuum suction device is in fluid communication with the condensing device; the feeding end of the pyrolysis device is communicated with a vacuum suction device.
In some embodiments of the invention, a temperature regulating device and a pressure regulating device are arranged in the extrusion dehydration device; the system further comprises a high-temperature flue gas generating device, wherein an exhaust port of the high-temperature flue gas generating device is communicated with an air inlet of the pyrolysis device, and the exhaust port of the pyrolysis device is communicated with the air inlet of the high-temperature flue gas generating device.
in some embodiments of the invention, the extrusion dehydration device is internally provided with a temperature regulation device and a pressure regulation device.
In some embodiments of the invention, one or more of the following technical features are also included:
B1) The temperature adjusting device is a flue gas inlet channel or a water vapor inlet channel, and the extrusion dehydration device is provided with a flue gas inlet channel or a water vapor inlet channel;
B2) The temperature adjusting device is an electric heating assembly or a heat conducting oil assembly, and the electric heating assembly or the heat conducting oil assembly is arranged in the extrusion dehydration device;
B3) The exhaust port of the condensing device is communicated with the air inlet of the high-temperature flue gas generating device;
B4) Volatile matters generated in the pyrolysis device generate smoke through a high-temperature smoke generating device;
B5) When the temperature of the flue gas generated in the pyrolysis system is increased, the waste gas discharged by the extrusion dehydration device in the temperature increasing process is condensed by the condensing device and then is subjected to high-temperature flue gas treatment by the high-temperature flue gas generating device;
B6) The pyrolysis device is communicated with the waste heat boiler, and the steam pressure of water generated by the waste heat boiler is 0.3-0.5 MPa.
drawings
fig. 1 is a schematic structural diagram of a wet garbage hydrothermal dehydropyrolysis system according to embodiments 1, 5, and 7 of the present invention.
fig. 2 is a schematic structural diagram of a wet garbage hydrothermal removal system according to embodiments 2 and 6 of the present invention.
Fig. 3 is a schematic structural diagram of a wet garbage hydrothermal removal system according to embodiments 3, 4, 8, and 9 of the present invention.
FIG. 4 is a schematic view showing the operation of the press dehydrator according to the present invention.
Description of element labels:
1 Wet garbage
2 extrusion dehydration device
3 pyrolysis device
4 high-pressure flue gas generating device
5 waste heat boiler
6 steam of pyrolysis system
7 one-time dehydration
8 vacuum suction device
9 flue gas of pyrolysis system
10 condensing unit
11 first self-evaporating condensate
12 second self-evaporating condensate
13 exhaust gas
14 gas phase from three dehydrations
15 exhaust gas
Detailed Description
In the description of the present invention, it should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the technical disclosure of the present invention without affecting the function and the achievable purpose of the present invention. While the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like refer to orientations and positional relationships illustrated in the drawings, which are used for convenience in describing the invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The method and system for dehydrating and pyrolyzing wet garbage according to the present invention will be described in detail below.
The invention provides a wet garbage hydrothermal method in a first aspect, which comprises the following steps:
1) Extruding the wet garbage 1, wherein the temperature condition of the extrusion treatment is 85-101 ℃, the extrusion pressure condition is 5-10MPa, and the time is 10-20 min;
2) Further increasing the extrusion pressure condition to more than 10MPa to realize primary dehydration treatment so as to provide a solid phase substance obtained by primary dehydration and a liquid phase substance 7 obtained by primary dehydration;
3) Carrying out pressure relief treatment on the dehydration system subjected to the primary dehydration treatment to provide a solid phase substance obtained by secondary dehydration and exhaust gas 13, and carrying out condensation treatment on the exhaust gas 13 to capture and provide first self-evaporation condensed water 11;
4) carrying out tertiary dehydration on the solid phase substance obtained by the secondary dehydration in the step 3) to provide a solid phase substance obtained by the tertiary dehydration and a gas phase substance 14 obtained by the tertiary dehydration, wherein the pressure condition of the tertiary dehydration is normal pressure;
5) Condensing the gas phase substance 14 obtained by the third dehydration provided by the step 4) to capture and provide second self-evaporation condensed water;
6) Carrying out pyrolysis treatment on the solid phase substance obtained by the three times of dehydration provided by the step 4).
In the wet garbage dehydration pyrolysis method provided by the invention, the wet garbage (1) is subjected to extrusion treatment, the temperature condition of the extrusion treatment is 85-101 ℃, and in some preferred embodiments, the temperature condition of the extrusion treatment can be 85-90 ℃, 90-95 ℃ or 95-101 ℃. The extrusion pressure refers to the pressure applied to the wet waste, and the extrusion pressure condition is 5-10MPa, and in some preferred embodiments, the extrusion pressure condition can be 5-6MPa, 6-7MPa, 7-8MPa, 8-9MPa, or 9-10 MPa. The holding time at the above temperature and extrusion pressure is 10-20min, and in some preferred embodiments, the holding time may be 10-12min, 12-14min, 14-16min, 16-18min, or 18-20 min. The pressure is released and pressurized repeatedly during the holding time. The extrusion in the step 1) of the invention utilizes the principle that the internal moisture of the wet garbage 1 destroys the biomass organic matter cells under the extrusion pressure and temperature conditions because of the superposition of mechanical pressure energy and temperature rise, so that the moisture is more easily separated out, the moisture in the wet garbage 1 can be separated to the maximum extent, the moisture is directly reduced from 70-80% to below 50%, and the dehydration efficiency is higher than that of a conventional extrusion dehydrator.
Further, the primary dehydration is realized by heating the wet garbage 1 in the extrusion dehydration system to 85-101 ℃, and can be realized by three ways:
1) Heating flue gas, and using at least part of the flue gas 9 generated in the pyrolysis system in the step 6) to heat the wet garbage 1 to 85-101 ℃.
2) Heating by water vapor, and heating the wet garbage 1 to 85-101 ℃ by at least part of the water vapor 6 generated in the pyrolysis system in the step 6).
3) Wall surface heating: the extrusion dehydration system heats the wet garbage 1 to 85-101 ℃ through electric heating or heat conducting oil.
the method is based on the modes of extrusion dehydration, flue gas heating or water vapor heating, hot smoke or a small amount of water vapor is added in the extrusion process to reach a certain temperature, then the extrusion is continued, so that most of water is removed in the extrusion mode, and the removed water is water and does not carry latent heat of vaporization; rather than steam, and therefore lower energy consumption.
Further, the extrusion dehydration system enables the extrusion pressure of the wet garbage 1 to reach more than 5-10MPa through hydraulic pressure or screw extrusion.
In the wet garbage dehydration pyrolysis method provided by the invention, the step 2) is completed by further increasing the extrusion pressure to be more than 10MPa and realizes primary dehydration treatment so as to provide a solid phase substance obtained by primary dehydration and a liquid phase substance 7 obtained by primary dehydration; the invention realizes primary dehydration through the whole process of temperature rise (85-101 ℃), pressure maintaining (extrusion pressure is 5-10MPa, time is 10-20min) and pressure increasing (extrusion pressure is increased by more than 10 MPa). The liquid phase 7 obtained by primary dehydration can be anaerobic treatment or other existing organic wastewater treatment technologies in general, and can be irrigated for use after treatment.
In the wet garbage dehydration pyrolysis method provided by the invention, the dehydration system of the primary dehydration treatment is subjected to pressure relief treatment to provide a solid phase substance obtained by secondary dehydration and exhaust gas 13, and the exhaust gas 13 is subjected to condensation treatment to provide first self-evaporation condensed water 11, wherein the exhaust gas 13 usually comprises self-evaporation water vapor and a small amount of odor in the pressure relief process. The self-evaporated water vapor is condensed to become the first self-evaporated condensed water 11, and a small amount of odor can be directly discharged because the odor is in ppm level. Or may be deodorized by producing smoke.
In the wet garbage dehydration pyrolysis method provided by the invention, the step 4) is to perform three times of dehydration on the solid phase substance obtained by the secondary dehydration so as to provide the solid phase substance obtained by the three times of dehydration and the gas phase substance 14 obtained by the three times of dehydration, and the pressure condition of the three times of dehydration is normal pressure. The third dehydration of the solid phase obtained by the second dehydration means that a part of water vapor and odor are also generated in the process of transferring the solid phase obtained by the second dehydration to a pyrolysis system, and the part of water vapor and odor are the gas phase 14 obtained by the third dehydration.
in the wet garbage dehydration pyrolysis method provided by the invention, the gas phase 14 obtained by three times of dehydration is further extracted in the step 5) and then is subjected to condensation treatment to provide second self-evaporation condensed water 12. The first and second self-evaporation condensate water 11 and 12 are preferably recycled in the condenser 10. Wherein, a small amount of odor in the gas phase substance 14 obtained by the three-time dehydration is in ppm level and can be directly discharged; or may be deodorized by producing smoke.
In the wet garbage dehydration pyrolysis method provided by the invention, the step 6) is to perform pyrolysis treatment on solid-phase substances obtained by three times of dehydration. Or pyrolyzing the solid phase obtained by three times of dehydration and dry garbage together, wherein the pyrolysis temperature is 450-750 ℃, and combustible volatile matters and pyrolytic carbon are produced after pyrolysis, wherein the volatile matters comprise combustible gases such as CO and H2、CH4And CO2and oil and small amounts of water vapor, which are gases at high temperatures.
In the wet garbage dehydration pyrolysis method provided by the invention, the pyrolysis system generally comprises pyrolysis, the volatile matters or the pyrolysis carbon after the pyrolysis are combusted, and high-temperature flue gas generated after the combustion of the volatile matters or the pyrolysis carbon, in a preferred embodiment, the high-temperature flue gas belongs to flue gas of the pyrolysis system, and a part of the high-temperature flue gas can be used for heating the wet garbage 1 to 85-101 ℃, condensing waste gas discharged from the extrusion dehydration system during the heating process, and then treating the waste gas by generating flue gas. In another preferred embodiment, the high-temperature flue gas is subjected to waste heat recovery and water vapor is generated, the water vapor is the water vapor 6 in the pyrolysis system, wherein a part of the water vapor 6 is used for heating the wet garbage 1 to 85-101 ℃, and the rest part of the water vapor 6 is mainly externally used.
In a second aspect, the present invention provides a wet waste hydrothermal removal system, comprising:
The extrusion dehydration device 2 is used for carrying out extrusion treatment and primary dehydration treatment on the wet garbage 1 to provide a solid-phase substance obtained by primary dehydration and a liquid-phase substance 7 obtained by primary dehydration, and carrying out pressure relief treatment on the extrusion dehydration device 2 after the primary dehydration treatment to provide a solid-phase substance obtained by secondary dehydration and exhaust gas 13;
A vacuum suction device 8, wherein the vacuum suction device 8 is used for performing suction treatment on the solid phase substance obtained by the secondary dehydration so as to provide a solid phase substance obtained by the tertiary dehydration and a gas phase substance 14 obtained by the tertiary dehydration; the vacuum suction device 8 is communicated with the discharge end of the extrusion dehydration device 2;
The condensing device 10 is used for condensing the exhaust gas 13 in the pressure relief process in the extrusion dehydration device 2 after the primary dehydration and the gas phase 14 obtained by the tertiary dehydration, the condensing device 10 is in fluid communication with the extrusion dehydration device 2, and the vacuum suction device 8 is in fluid communication with the condensing device 10;
The pyrolysis device 3 is used for carrying out pyrolysis treatment on the solid-phase substance obtained by the three times of dehydration; the feeding end of the pyrolysis device 3 is communicated with a vacuum suction device 8.
In the wet garbage hydrothermal removal system provided by the invention, the system comprises an extrusion dehydration device 2, and the extrusion dehydration device 2 is used for carrying out extrusion treatment and primary dehydration treatment on wet garbage 1. The system may comprise the press dewatering device 2, which press dewatering device 2 is normally used for pressing and primary dewatering of wet waste 1. The pressing treatment is generally referred to as pressing the wet waste, thereby analyzing the water in the wet waste. In a specific embodiment of the invention, the temperature condition of the extrusion treatment in the extrusion treatment is 85-101 ℃, the extrusion pressure refers to the pressure applied to the wet garbage, the extrusion pressure condition is 5-10MPa, and the time is 10-20 min; in some preferred embodiments, the temperature conditions for the extrusion process may be 85 to 90 ℃, 90 to 95 ℃, or 95 to 101 ℃. The extrusion pressure condition can be 5-6MPa, 6-7MPa, 7-8MPa, 8-9MPa, or 9-10 MPa. The time can be 10-12min, 12-14min, 14-16min, 16-18min, or 18-20 min. The primary dewatering treatment is to discharge water by pressure and heat treatment in the press dewatering device, and in one embodiment of the present invention, the primary dewatering treatment is performed under a press pressure condition of 10MPa or more, usually 15MPa or more, or 20MPa or more, and under the press pressure condition, rapid dewatering can be achieved. The press dehydration unit 2 may be provided with a material introduction pipe so that the wet garbage 1 to be treated can be introduced into the reaction unit to be further subjected to a press treatment and/or a primary dehydration treatment. The extrusion dehydration device 2 can be a suitable extrusion dehydrator, for example, a hydraulically driven dehydrator or a screw-driven extrusion dehydrator, and any hydraulically driven dehydrator or screw extrusion dehydrator capable of providing an extrusion pressure of more than 10Mpa can be used; can be selected according to the amount of wet waste; the hydraulically driven dehydrator can also be a ring-shaped hydraulically driven dehydrator with an inner cylinder. More specifically, the screw extrusion dehydrator may be a DLLXT300-450 type available from Zhengzhou Dingli New energy technology Co., Ltd. As can be seen from FIG. 4, the operation principle of the squeezing and dewatering device 2 is that the material is fed into the squeezing and dewatering device 2, the wet garbage is put into the squeezing and dewatering device 2, then the temperature is raised to 85-101 ℃, the pressure is raised for 10-20min, and the pressure is released and pressurized repeatedly during the period, and then the pressure dewatering treatment is carried out.
Further, the extrusion dehydration device 2 may include a temperature adjusting device, the temperature adjusting device may be used for adjusting the temperature of the material in the reaction device 2, and a person skilled in the art may select a suitable temperature adjusting device for the extrusion dehydration device 2, the temperature adjusting device may be, for example, a flue gas inlet channel or a water vapor inlet channel arranged on the extrusion dehydration device 2, and the flue gas or the water vapor is introduced into the extrusion dehydration device 2 for heating; or an electric heating component or a heat conducting oil component can be arranged in the extrusion dehydration device 2; and a jacket for introducing water with proper temperature can also be introduced. Specifically, in a preferred embodiment, the temperature adjusting device controls the temperature for flue gas or water vapor, and the hot and humid extrusion dehydrator is provided with an air inlet channel for flue gas or water vapor, and the air inlet channel is communicated with the inner cavity of the extrusion dehydrator 2. Wherein the entering amount of the flue gas or the water vapor 6 is controlled by the temperature of the material close to the discharge end of the extrusion dehydration device 2, and the flue gas 9 generated in the pyrolysis system or the water vapor 6 generated in the pyrolysis system is continuously fed when the temperature of the material close to the discharge end is lower than 85 ℃; stopping when the temperature reaches 101 ℃. In another preferred embodiment, the temperature adjusting device may be an electric heating component or a heat conducting oil component, and the wet garbage 1 is heated to a temperature in the range of 85-101 ℃, and the electric heating component or the heat conducting oil component is arranged in the pressure dehydration device. The electric heating component or the heat conducting oil component can be arranged on the inner cylinder or the outer wall of the extrusion dehydration device 2.
Further, extrusion dewatering device 2 can include pressure regulating device, pressure regulating device can be arranged in adjusting reaction unit 2 and extrude the pressure that the dehydration system applyed on wet rubbish, and the suitable pressure regulating device of technical staff's selection in the field can be used for extrusion dewatering device 2, for example, can be hydraulic drive, applys pressure to extrusion pushing head or extrusion piston, specifically, for example can be close to the cylinder body that extrusion dewatering device top was fixed with the pneumatic cylinder in the extrusion dewatering device cavity, be provided with the extrusion piston on the piston rod of pneumatic cylinder, the below of extrusion piston is equipped with the dehydration jar, just the extrusion piston is in when sliding in the dehydration jar, can extrude the dehydration to the material. The pressure regulating device of the invention may also be screw driven: specifically, for example, a motor for providing power is fixed inside the cavity of the dehydration extrusion device 2, a reducer is connected to an output shaft of the motor in a transmission manner, a screw rod for providing extrusion force is connected to an output end of the reducer in a transmission manner, and wet garbage in a space between a screw shaft of the screw rod and the blades is extruded by the motor under the driving of the reducer. So that the pressing pressure applied to the wet trash 1 is in the range of 5 to 10MPa or more.
Further, the extrusion dehydration device 2 also comprises a liquid discharge port, the extrusion dehydration material is subjected to primary dehydration treatment to obtain a primary dehydrated solid phase material and a primary dehydrated liquid phase material 7, and the pressure in the extrusion dehydration device 2 is adjusted to be more than 10 MPa; under the pressure condition, the rapid dehydration can be realized, the liquid phase substance 7 obtained by the primary dehydration can be discharged through a liquid outlet, wherein the liquid phase substance 7 obtained by the primary dehydration can be treated by anaerobic treatment or other conventional organic wastewater treatment technologies in general, and can be irrigated for use after treatment.
Further, the press dewatering device 2 may also have a pressure relief opening, which may be, for example, a pressure relief valve, for relieving the pressure inside the press dewatering device 2. And (3) carrying out pressure relief treatment on the extrusion dehydration device 2 after the primary dehydration treatment through a pressure relief opening to provide a solid phase substance obtained by secondary dehydration and exhaust gas 13.
The wet garbage dehydration pyrolysis system provided by the invention further comprises a condensing device 10, wherein the condensing device 10 is used for condensing the exhaust gas 13 in the pressure relief process in the dehydration system of the primary dehydration treatment and the gas phase 14 obtained by three times of dehydration; the pressure relief port of the extrusion dehydration device 2 is communicated with the air inlet of the condensing device 10, and the condensing device 10 can be, for example, a shell and tube condenser for indirect condensation of a condenser or a spray tower condenser for direct condensation. In one embodiment of the present invention, the exhaust gas 13 during the pressure relief process in the dehydration system of the primary dehydration treatment is condensed by the condensing device 10, and the exhaust gas 13 usually comprises water vapor self-evaporated during the pressure relief process and a small amount of odor. The self-evaporating water vapor is condensed by the condenser to form a first self-evaporating condensate 11, and the first self-evaporating condensate 11 is preferably recycled in the condensing device 10. A small amount of odor was in the ppm range and could be directly discharged. Or the high-temperature flue gas generation device can be used for generating flue gas for deodorization.
the wet garbage water-removing pyrolysis system provided by the invention further comprises a vacuum suction device 8, the vacuum suction device 8 is usually positioned between the extrusion dehydration device 2 and the pyrolysis device 3, the extrusion dehydration device 2 is usually communicated with the pyrolysis device 3 through a communication pipeline, and the vacuum suction device 8 can be positioned at the discharge end of the extrusion dehydration device 2, the feed end of the pyrolysis device 3 or the communication pipeline. The suction port of the vacuum suction device 8 is communicated with the discharge end of the extrusion dehydration device 2, the exhaust port of the vacuum suction device 8 is communicated with the air inlet of the condensing device 10, the solid-phase substance obtained by secondary dehydration after pressure relief can continuously generate self-evaporated water vapor and a small amount of odor in the transmission process, the water vapor and the small amount of odor are the gas-phase substance 14 obtained by tertiary dehydration, the gas-phase substance 14 obtained by tertiary dehydration is pumped away by the vacuum suction device 8 and enters the condensing device 10 for condensation to generate second self-evaporated condensate water 12, and the second self-evaporated condensate water 12 is preferably recycled in the condensing device 10. A small amount of odor was in the ppm range and could be directly discharged. Or the high-temperature flue gas generation device 4 can be used for generating flue gas for deodorization. The vacuum suction device 8 may be, for example, an induced draft fan, an air suction pump, or the like that supplies a negative pressure of-300 Pa to-100 Pa.
the wet garbage dehydration pyrolysis system provided by the invention also comprises a pyrolysis device 3, wherein the pyrolysis device 3 is used for performing pyrolysis treatment on solid-phase substances obtained by three times of dehydration; the pyrolysis treatment generally means that the waste is placed in a completely sealed furnace and the temperature in the furnace is heated to 450 to 750 ℃. Under the conditions of high temperature and oxygen deficiency, organic matters in the garbage are decomposed to generate combustible volatile matters and pyrolytic carbon, in a further embodiment of the invention, the pyrolytic treatment is to pyrolyze solid-phase matters obtained by three times of dehydration in a pyrolysis device 3 at the temperature of 450-750 ℃ to generate combustible volatile matters and pyrolytic carbon, wherein the combustible volatile matters comprise combustible gases such as CO and H2、CH4and CO2and oil and small amounts of water vapor, which are gases at high temperatures. Pyrolysis device 3's feed end with extrusion dewatering device 2's discharge end intercommunication, vacuum suction device 8 is located between extrusion dewatering device 2 and pyrolysis device 3, in some embodiments, vacuum suction device 8 can be for extrusion dewatering device 2's discharge end, also can set up the feed end at pyrolysis device 3, be equipped with material introduction pipeline on pyrolysis device 3, material introduction pipeline and pyrolysis device 3's feed end intercommunication to can introduce the pyrolysis furnace with cubic dehydration gained solid phase thing, in order further to stand the pyrolysis and handle. The pyrolysis unit 3 may be selected from any pyrolysis carbonization unit known in the art, such as a rotary kiln type pyrolysis unit, a screw propulsion type pyrolysis unit, or a combination of both, and the like.
the wet garbage water-removing pyrolysis system provided by the invention also comprises a high-temperature flue gas generation device 4, wherein the high-temperature flue gas generation device 4 is used for generating flue gas from volatile matters in the pyrolysis device 3, and also can be used for treating waste gas 15 discharged by the extrusion dehydration device 2 in the heating process after being condensed by the condensation device 10 when the temperature of the flue gas generated in the pyrolysis system is raised. The high-temperature flue gas generating device 4 is a volatile combustion furnace. In order to utilize energy, the exhaust end of the pyrolysis device 3 is communicated with the air inlet end of the high-temperature flue gas generation device 4, or the discharge end of the pyrolysis device 3 is communicated with the feed end of the high-temperature flue gas generation device 4, and volatile matters or pyrolytic carbon are combusted in the high-temperature flue gas generation device 4 to generate high-temperature flue gas. The high-temperature flue gas generating device 4 comprises an air inlet channel for introducing volatile matters or waste gas into the high-temperature flue gas generating device 4 to generate high-temperature flue gas, and the generated high-temperature flue gas enters the air inlet of the pyrolysis device 3 through the air outlet of the high-temperature flue gas generating device 4.
In a preferred embodiment, the high-temperature flue gas generating device 4 utilizes high-temperature flue gas generated by burning volatile matters or pyrolytic carbon to be sent into the pyrolysis device 3 for heating and then to be discharged, at least part of flue gas 9 generated in the pyrolysis system is sent into the extrusion dehydration device 2 for temperature rise, and the rest part of the flue gas is mainly discharged outside. The waste gas 15 discharged by the extrusion dehydration device 2 in the temperature rising process is sent into the condensing device 10, a flue gas valve is arranged at the inlet of a flue gas inlet channel of the extrusion dehydration device 2, the flow of the flue gas sent into the extrusion dehydration device 2 is controlled by the temperature of the wet garbage 1 in the extrusion dehydration device 2, and when the temperature of the wet garbage 1 in the extrusion dehydration device 2 is lower than 85 ℃, the flue gas valve is opened; closing the flue gas valve when the temperature exceeds 101 ℃. The rest flue gas is discharged and treated, and the treatment mode can be selected from any existing flue gas purification technology which can realize standard emission, such as a plasma treatment technology. In addition, when the temperature of the flue gas 9 generated in the pyrolysis system is increased, the waste gas 15 in the device is sent into the high-temperature flue gas generating device 4 to be processed in the temperature increasing process of the extrusion dehydration device 2.
In another preferred embodiment, the high-temperature flue gas generating device 4 utilizes high-temperature flue gas generated by burning volatile matters or pyrolytic carbon to be sent into the pyrolysis device 3 for heating and then discharged into the waste heat boiler 5, the steam pressure generated by the waste heat boiler 5 is 0.3-0.5 MPa, preferably 0.4MPa, at least part of the steam 6 generated in the pyrolysis system is sent into the extrusion dehydration device 2 for temperature rise, and the rest part of the steam is mainly externally utilized. A steam valve is arranged at a steam inlet of the extrusion dehydration device 2, the flow of the steam sent into the extrusion dehydration device 2 is controlled by the temperature of the wet garbage 1 in the extrusion dehydration device 2, and when the temperature of the wet garbage 1 in the extrusion dehydration device 2 is lower than 85 ℃, the steam valve is opened; closing the steam valve when said temperature exceeds 101 ℃. In a third alternative embodiment, the inner wall surface or the outer cylinder of the squeezing and dewatering device 2 heats the wet garbage 1 to 85-101 ℃ through electric heating or heat conducting oil. When the temperature of the wet garbage 1 in the extrusion dehydration device 2 is lower than 85 ℃, the electric heating or the heat conduction oil heating is started; and when the temperature exceeds 101 ℃, closing the electric heating switch or the heat-conducting oil heating valve.
In the wet garbage water-removing pyrolysis system provided by the invention, the pyrolysis device 3, the high-temperature flue gas generation device 4 and the waste heat boiler 5 can be regarded as part of the pyrolysis system, and the pyrolysis system comprises the pyrolysis device 3 and the high-temperature flue gas generation device 4 and can also comprise the waste heat boiler 5.
The wet garbage dehydrating and pyrolyzing method and system provided by the invention have the beneficial effects that:
1) When the wet garbage is inconvenient to transport for a long distance and the disposal station is inconvenient to independently arrange, the invention realizes the dehydration pyrolysis disposal of the wet garbage, saves the transportation cost and a large amount of energy consumption required by drying the wet garbage before conventional pyrolysis; improving the energy self-balancing level of the pyrolysis system.
2) the wet garbage is heated and extruded by using smoke or water vapor generated by a pyrolysis system to replace the traditional direct extrusion of wet materials at normal temperature, so that the separation and mechanical separation of moisture of the wet garbage are ensured, and the moisture after the wet garbage treatment can be reduced to below 50% without very high pressure; on one hand, the safety is improved, and the energy consumption is saved; on the other hand, the difficulty of subsequent treatment caused by the extrusion of 'slurry' is avoided; and thirdly, the water is prevented from being evaporated by using a large amount of heat.
3) The garbage is heated by utilizing the smoke or steam generated in the pyrolysis system, so that the energy is saved, the self-balancing level of the energy is improved, and the aim of pyrolyzing and carbonizing wet garbage without external auxiliary energy is fulfilled.
4) The extrusion dehydration device utilizes the principle that the internal moisture of wet garbage destroys biomass organic matter cells under the conditions of pressurization and 85-101 ℃ because of the superposition of mechanical pressure energy and temperature rise, the moisture is more easily separated out, the internal moisture can be separated to the maximum extent, the moisture is directly reduced from 70-80% to below 50%, the dehydration efficiency is higher than that of a conventional extrusion dehydrator, and the device can be used in combination with a pyrolysis furnace system and can also be used alone for removing the moisture of the wet garbage; or may be used in combination with incineration.
5) The invention combines the wet-heat pressurized dehydration and the pyrolysis of the garbage, on one hand, the waste heat in the pyrolysis system is fully utilized to supply heat to the wet-heat pressurized dehydration machine, and on the other hand, the cleaning technology of the pyrolysis is fully utilized to provide a solution for the disposal of the wet garbage.
6) the invention has good dehydration effect and controllable odor overflow by reasonably selecting the heating temperature of 85-101 ℃. Meanwhile, the combination with the pyrolysis can thoroughly control and eliminate the odor.
7) The invention provides an economic outlet for the pyrolysis disposal of medium and small-sized urban garbage with daily garbage of below 400 t/d.
8) The wastewater generated by dehydration is convenient for anaerobic treatment, and the pressure is moderate, so that the 'slurry' is prevented from being extruded, and the difficulty and the occupied area of the anaerobic treatment are both greatly reduced.
The following examples are provided to further illustrate the advantageous effects of the present invention.
in order to make the objects, technical solutions and advantageous technical effects of the present invention more clear, the present invention is further described in detail below with reference to examples. However, it should be understood that the embodiments of the present invention are only for explaining the present invention and are not for limiting the present invention, and the embodiments of the present invention are not limited to the embodiments given in the specification. The examples were prepared under conventional conditions or conditions recommended by the material suppliers without specifying specific experimental conditions or operating conditions.
Furthermore, it is to be understood that one or more method steps mentioned in the present invention does not exclude that other method steps may also be present before or after the combined steps or that other method steps may also be inserted between these explicitly mentioned steps, unless otherwise indicated; it is also to be understood that a combined connection between one or more devices/apparatus as referred to in the present application does not exclude that further devices/apparatus may be present before or after the combined device/apparatus or that further devices/apparatus may be interposed between two devices/apparatus explicitly referred to, unless otherwise indicated. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
In the following examples, reagents, materials and instruments used are commercially available unless otherwise specified.
example 1
the wet garbage dehydration pyrolysis method and system shown in fig. 1 comprise wet garbage 1, an extrusion dehydration device 2, a pyrolysis device 3, a high-temperature flue gas generation device 4, a waste heat boiler 5, water vapor 6 generated by a pyrolysis system, a liquid phase substance 7 obtained by primary dehydration, a vacuum suction device 8, flue gas 9 generated by the pyrolysis system, a condensation device 10, first self-evaporation condensed water 11, second self-evaporation condensed water 12, exhaust gas 13 and a gas phase substance 14 obtained by tertiary dehydration.
The wet garbage 1 is sent into an extrusion dehydration device 2, the extrusion dehydration device 2 is selected from a hydraulic drive dehydrator, the hydraulic pressure is within the range of 5-20MPa, the dehydrated wet garbage and dry garbage are pyrolyzed and carbonized together or separately in a pyrolysis device 3 to generate combustible volatile matters and pyrolytic carbon, the energy utilization is carried out by utilizing the prior art, and an optional utilization mode is that the wet garbage is combusted in a high-temperature flue gas generation device 4 to generate high-temperature flue gas. The pyrolysis apparatus 3 may be selected from any pyrolysis carbonization apparatus in the prior art, such as a rotary kiln type pyrolysis apparatus, a screw propulsion type pyrolysis apparatus, and the like. The high-temperature flue gas generating device 4 utilizes high-temperature flue gas generated by burning volatile matters or pyrolytic carbon to be sent into the pyrolysis device 3 for heating and then discharged into the waste heat boiler 5, the pressure of water vapor 6 generated by the waste heat boiler 5 is 0.4Mpa, the water vapor is mainly sent to the outside for utilization, a small part of the water vapor is sent into the extrusion dehydration device 2, the flow rate of the steam sent into the extrusion dehydration device 2 is controlled by utilizing the temperature of wet garbage in the extrusion dehydration device, and when the temperature is lower than 85 ℃, a steam valve is opened; closing the steam valve when said temperature exceeds 101 ℃. And applying a hydraulic pressure of 5-10MPa to the extrusion dehydration device 2, repeatedly releasing and pressurizing for 20min, raising the hydraulic extrusion pressure to 18MPa, and only generating a liquid phase substance 7 (wastewater) obtained by primary dehydration without generating waste gas 13 in the process. The wastewater can be discharged after anaerobic treatment by adopting the prior art. After 2 dehydration through extrusion dewatering device, the sample detection, find that wet rubbish moisture reduces to about 42%, exhaust gas 13 among the pressure release process gets into condensing equipment 10 and condenses and produces first self evaporation comdenstion water 11, the feed end of pyrolysis device 3 is sent to the obtained solid phase thing after the secondary dehydration, feed end department at pyrolysis device 3 is equipped with vacuum suction device 8, vacuum suction device 8 is taken away the obtained gaseous phase thing 14 of the in-process cubic dehydration of the obtained solid phase thing after the secondary dehydration after the pressure release and is transported to pyrolysis device 3 and is sent into condensing equipment 10, the first self evaporation comdenstion water 11 that produces after the condensation is handled with second self evaporation comdenstion water 12 together, send into the circulating water and continue to use in condenser 10. The solid phase matter obtained by the three-time dehydration is sent to the pyrolysis device 3 for pyrolysis to generate combustible volatile matters and pyrolytic carbon, energy utilization is carried out by utilizing the prior art, a selectable utilization mode is that the solid phase matter is combusted in the high-temperature flue gas generation device 4 to generate high-temperature flue gas, and the high-temperature flue gas generated by the combustion of the volatile matters or the pyrolytic carbon is sent to the pyrolysis device 3 for heating and then is discharged into the waste heat boiler 5 to realize circulation.
Wherein the condensing device is an STBF-3 spray tower type condenser provided by Guangzhou environmental protection Limited Corp, and the vacuum suction device 8 is a draught fan with negative pressure of-100 Pa; the pyrolysis device 3 can be selected from any pyrolysis carbonization device in the prior art, such as a rotary kiln type pyrolysis device, a spiral propulsion type pyrolysis device and the like, and the high-temperature flue gas generation device is an existing mature combustion furnace and is designed and manufactured according to the output of volatile matters.
In the embodiment, the waste heat boiler 5 is adopted, on one hand, steam is generated for industrial production, and on the other hand, the non-condensable odor generated by the extrusion dehydration device 2 is thoroughly avoided. The whole system has no peculiar smell and odor. The pyrolysis system does not require external auxiliary fuel for normal operation.
Example 2
The wet garbage dehydration pyrolysis method shown in fig. 2 comprises wet garbage 1, an extrusion dehydration device 2, a pyrolysis device 3, a high-temperature flue gas generation device 4, a liquid phase substance obtained by primary dehydration 7, a vacuum suction device 8, flue gas 9 generated by a pyrolysis system, a condensing device 10, first self-evaporation condensed water 11, second self-evaporation condensed water 12, exhaust gas 13, a gas phase substance obtained by tertiary dehydration 14 and waste gas 15.
In the embodiment, the wet garbage 1 is sent into an extrusion dehydration device 2, the extrusion dehydration device 2 is selected from a hydraulic drive dehydrator, the hydraulic pressure is 5-20MPa, a small part of hot smoke 9 is fed into the extrusion dehydration device 2 in the initial stage, the flow rate of the hot smoke is controlled by the temperature of the wet garbage in the extrusion dehydration device 2, when the temperature of the garbage is lower than 85 ℃, a valve on a large smoke pipeline is opened, and the flow rate of the smoke introduced into the extrusion dehydration device 2 is increased; because the flue gas is introduced into the extrusion dehydration device 2, a small amount of waste gas 13 which can exist in the extrusion dehydration device 2 is sent into the condensing device 10 by the waste gas 15; and when the temperature of the garbage is lower than 101 ℃, closing a valve on the flue gas pipeline and stopping introducing the flue gas. The extrusion pressure is 5-10MPa, and repeated pressure release and pressurization are performed, and after maintaining for 20min, the extrusion pressure is increased to 10-20MPa for primary dehydration, and the water content is reduced to below 45%. The treatment technique of the liquid phase 7 obtained by primary dehydration can be selected from the existing anaerobic fermentation technique or the existing other organic wastewater treatment technique. After entering the condensing device 10, the exhaust gas 13 in the pressure relief process generates first self-evaporation condensed water 11; the obtained solid phase thing of secondary dehydration sends the feed end of pyrolysis device 3 to, be equipped with vacuum suction device 8 at the feed end of pyrolysis device 3, 2 pressure release back extrusion dewatering device three times dehydration gained gaseous phase thing 14 are taken away and are sent into condensing equipment 10, second self-evaporation comdenstion water 12 that condensing equipment 10 produced is together with first self-evaporation comdenstion water 11, supply condensing equipment 10 cycle use after cooling in the system, three times dehydration gained solid phase thing is together with dry rubbish or alone with wet rubbish in pyrolysis carbonization in pyrolysis device 3, produce combustible volatile and pyrolytic carbon, utilize prior art to carry out the energy utilization, a selectable utilization mode is burning at high temperature flue gas generating device 4, produce high temperature flue gas. The high-temperature flue gas is sent into the pyrolysis device 3 to be heated, and then the discharged flue gas is the flue gas 9 in the pyrolysis system, wherein a small part of the flue gas is sent into the extrusion dehydration device 2, as described above. Most of the waste water is discharged after being treated by the prior art.
Wherein the condensing device 10 is selected from a condenser for direct or indirect condensation, such as a tubular condenser selected from Wuxi Youngong Chundao chemical equipment manufacturing limited company or a vertical PP double-layer band demister spray tower selected from Jiangsu Zhongming environmental protection technology limited company; the vacuum suction device 8 is a draught fan with negative pressure of-100 Pa; the pyrolysis apparatus 3 may be selected from any pyrolysis carbonization apparatus in the prior art, such as a rotary kiln type pyrolysis apparatus, a screw propulsion type pyrolysis apparatus, and the like. The high-temperature flue gas generation device 4 is selected from a combustion furnace.
The pyrolysis system does not require external auxiliary fuel for normal operation. Compared with the embodiment 1, the embodiment does not use the waste heat boiler 5, which saves the investment of the waste heat boiler 5, but needs to send the waste gas 15 discharged from the damp and hot extrusion dehydrator 2 to the condenser 10 for condensation and further to the high temperature flue gas generator 4 for treatment. The whole system has no peculiar smell and odor.
Example 3
The wet garbage dehydration pyrolysis method shown in fig. 3 comprises wet garbage 1, an extrusion dehydration device 2, a pyrolysis device 3, a high-temperature flue gas generation device 4, a liquid phase substance obtained by primary dehydration 7, a vacuum suction device 8, flue gas 9 generated by a pyrolysis system, a condensing device 10, first self-evaporation condensed water 11, second self-evaporation condensed water 12, exhaust gas 13 and a gas phase substance obtained by tertiary dehydration 14.
in this embodiment, the wet waste 1 is fed into an extrusion dehydration unit 2, and the extrusion dehydration unit 2 is selected from a ring-shaped hydraulically-driven dehydrator with an inner cylinder, and the hydraulic pressure is 5-20 MPa. The inner cylinder of the extrusion dehydration device 2 is provided with an electric heating device, the temperature of the wet garbage in the extrusion dehydration device 2 is heated to 85-101 ℃ through the wall of the inner cylinder, and extrusion pressure is applied to 5-10MPa for 15-20min, and repeated actions of pressure release and pressurization are carried out in the process; the extrusion pressure was then increased to above 10 MPa. Collecting the liquid phase substance 7 obtained by primary dehydration, and discharging after anaerobic treatment. After the primary dehydration of the extrusion dehydration device 2, sampling detection shows that the moisture content is reduced to below 48%, the exhaust gas 13 generated in the pressure relief process enters a condensing device 10 to be condensed to obtain first self-evaporation condensed water 11, the solid phase obtained by the secondary dehydration is sent to the feeding end of the pyrolysis device 3, a vacuum suction device 8 is arranged at the feeding end of the pyrolysis device 3, the vacuum suction device 8 is a negative pressure draught fan of-130 Pa, and the gas phase 14 obtained by the tertiary dehydration is pumped away and sent into the condensing device 10. The first self-evaporation condensate water 11 and the second self-evaporation condensate water 12 generated after condensation are cooled in the system and then recycled for circulation of the spray tower type condensing device. The solid phase material obtained by the three times of dehydration and the dry garbage are pyrolyzed and carbonized together or separately in the pyrolysis device 3 to generate combustible volatile matters and pyrolytic carbon, the energy utilization is carried out by utilizing the prior art, and one optional utilization mode is that the combustible volatile matters and the pyrolytic carbon are combusted in the high-temperature flue gas generating device 4 to generate high-temperature flue gas. The high-temperature flue gas generated by the high-temperature flue gas generator 4 is sent into the pyrolysis device 3 for heating and then discharged for outward discharge treatment. The system is simple, and the pyrolysis system does not need external auxiliary fuel during normal operation.
wherein the condensing unit 10 is selected from a spray tower condenser in which water and gas are directly or indirectly contacted; the vacuum suction device 8 is a draught fan with negative pressure of-130 Pa; the pyrolysis apparatus 3 may be selected from any pyrolysis carbonization apparatus in the prior art, such as a rotary kiln type pyrolysis apparatus, a screw propulsion type pyrolysis apparatus, and the like. The high-temperature flue gas generation device 4 is selected from a combustion furnace.
the whole system has no peculiar smell. No odor is overflowed.
example 4
The wet garbage dehydration pyrolysis method shown in fig. 3 comprises wet garbage 1, an extrusion dehydration device 2, a pyrolysis device 3, a high-temperature flue gas generation device 4, a liquid phase substance obtained by primary dehydration 7, a vacuum suction device 8, flue gas 9 generated by a pyrolysis system, a condensing device 10, first self-evaporation condensed water 11, second self-evaporation condensed water 12, exhaust gas 13 and a gas phase substance obtained by tertiary dehydration 14.
In this embodiment, the wet garbage 1 is fed into the extrusion dehydration device 2, the extrusion dehydration device 2 is selected from a dehydrator driven by a screw to extrude, and finally the extrusion pressure reaches the range of 5-15 MPa. An electric heating component or a heat conducting oil heating component is arranged on the outer wall surface of the spiral, and the temperature of the wet garbage in the extrusion dehydration device 2 is heated to 99-101 ℃ through the heating of the whole outer cylinder wall. And applying a pressing pressure of 10MPa for 10min, repeatedly releasing and pressurizing, and increasing the pressing pressure to 15MPa for dewatering. And collecting the liquid phase substance 7 obtained by primary dehydration, and discharging after anaerobic treatment. The moisture content reduces to below 45% after damp and hot extrusion dehydration, exhaust gas 13 that the extrusion dewatering device 2 pressure release in-process produced gets into condensing equipment 10, the postcondensation obtains first self evaporation comdenstion water 11, the feed end of pyrolysis device 3 is sent to the solid-phase thing that the secondary dewaters, feed end department at pyrolysis device 3 is equipped with vacuum suction device 8, vacuum suction device 8 is the negative pressure draught fan of-130 Pa, take away the gaseous phase thing 14 that the tertiary dehydration that will further produce after the pressure release and send into condensing equipment 10, condensing equipment 10 is the shell and tube condenser, first self evaporation comdenstion water 11 that produces after the condensation and second self evaporation comdenstion water 12 are used for shell and tube condenser's circulation. The treatment technology of the liquid phase substance 7 obtained by primary dehydration can be selected from the existing anaerobic fermentation technology or the existing other organic wastewater treatment technologies, and a small amount of residual odor can be sent to the high-temperature flue gas generating device 4. The solid phase substance obtained by the three times of dehydration and the dry garbage are pyrolyzed and carbonized in the pyrolysis device 3 together or independently to generate combustible volatile matters and pyrolytic carbon, the energy utilization is carried out by utilizing the prior art, and an optional utilization mode is that the solid phase substance is combusted in the high-temperature flue gas generation device 4 to generate high-temperature flue gas. The pyrolysis apparatus 3 may be selected from any pyrolysis carbonization apparatus in the prior art, such as a rotary kiln type pyrolysis apparatus, a screw propulsion type pyrolysis apparatus, and the like. The high-temperature flue gas generated by the high-temperature flue gas generator 4 is sent into the pyrolysis device 3 to be heated and then is discharged to the outside to be subjected to waste heat utilization, and the whole system is very simple. The liquid phase material 7 obtained by primary dehydration generated by the extrusion dehydration device 2 is treated anaerobically, and the first self-evaporation condensed water 11 and the second self-evaporation condensed water 12 generated after condensation are treated together and sent into the circulating water to be continuously used in the condensation device 10. Compared with the previous embodiment, the system of the embodiment is simplest, and the whole system has no peculiar smell and odor. The pyrolysis system does not require external auxiliary fuel for normal operation.
Wherein the condensing device 10 is selected from a tube condenser of Wuxi Youda chemical plant manufacturing Limited; the vacuum suction device 8 is a negative pressure draught fan with-130 Pa; the pyrolysis apparatus 3 may be selected from any pyrolysis carbonization apparatus in the prior art, such as a rotary kiln type pyrolysis apparatus, a screw propulsion type pyrolysis apparatus, and the like. The high-temperature flue gas generation device 4 is selected from a combustion furnace.
Example 5
Garbage is classified and collected in a certain area of a certain city to generate 100t/d of wet garbage, and no planning field is available for building anaerobic treatment facilities. By adopting the wet garbage dehydration pyrolysis method and system treatment shown in fig. 1, the moisture content of wet garbage 1 is analyzed to be 80%, the extrusion dehydration device 2, the pyrolysis device 3, the high-temperature flue gas generation device 4, the waste heat boiler 5, the steam 6 generated by the pyrolysis system, the liquid phase substance 7 obtained by primary dehydration, the vacuum suction device 8, the flue gas 9 generated by the pyrolysis system, the condensing device 10, the first self-evaporation condensed water 11, the second self-evaporation condensed water 12, the exhaust gas 13 and the gas phase substance 14 obtained by tertiary dehydration are analyzed.
The extrusion dehydration device 2 is selected from a hydraulic drive dehydrator, and the hydraulic pressure is 5-20 MPa. The device is provided with a 40t/d pyrolysis device 3, the pyrolysis device 3 is selected from a spiral propelling type pyrolysis device, the high-temperature flue gas generation device 4 is selected from a combustion furnace, and the generated high-temperature flue gas is used for heating. The vacuum suction device 8 is a negative pressure draught fan with the pressure of-130 Pa, the condensing device 10 is selected from a tube type condenser of Wuxi Yongda chemical equipment manufacturing limited company, a waste heat boiler 5 is arranged, and the steam pressure generated by using high-temperature flue gas 9 as a heat source is 0.4 MPa; heating the wet garbage 1 after feeding to 95-99 ℃ in an extrusion dehydration device 2 with a steam input hole, maintaining for 15min under 5-10MPa, repeatedly releasing pressure and pressurizing during the process, then increasing the pressure to 20MPa for primary dehydration to reduce the water content to about 48%, introducing exhaust gas 13 in the pressure releasing process of the extrusion dehydration device 2 into a condensing device 10 (a tubular condenser of Wuxi Yongda chemical equipment manufacturing limited company) for condensation to generate first self-evaporation condensed water 11, sending a solid phase substance obtained by secondary dehydration to the feeding end of a pyrolysis device 3, arranging a vacuum suction device 8 at the feeding end of the pyrolysis device, pumping a gas phase substance 14 obtained by third dehydration further generated in the process of sending the solid phase substance obtained by secondary dehydration to the pyrolysis device 3, condensing the gas phase substance 14 obtained by third dehydration to generate second self-evaporation condensed water 12, the second self-evaporating condensate 12 produced after condensation is treated together with the first self-evaporating condensate 11 and fed into the circulating water for further use in the condensation device 10. Solid phase substances obtained by three times of dehydration are independently pyrolyzed and carbonized in a pyrolysis furnace 3, generated volatile matters are combusted in a high-temperature smoke generator 4, the generated high-temperature smoke is sent into a pyrolysis device 3 to be heated and then discharged into a waste heat boiler 5, water vapor 6 generated in a part of pyrolysis system is sent into an extrusion dehydration device 2 to be used for heating and heating wet garbage in the extrusion dehydration device 2, the flow rate of the vapor sent into the extrusion dehydration device 2 is controlled by utilizing the temperature of the wet garbage in the extrusion dehydration device 2, and when the temperature is lower than 95 ℃, a vapor valve is opened greatly; closing the steam valve when said temperature exceeds 99 ℃. No waste gas is generated in the process, and only 63 tons/d of waste water (carrying 1.46 tons of silt and the like) is generated. The first self-evaporation condensed water 11 can be discharged after anaerobic treatment, the generated methane is used by the high-temperature smoke generator 4, and compared with the anaerobic treatment facility independently constructed by wet garbage of 100t/d, the anaerobic treatment of the waste water reduces the required site and investment by more than 65%. And no biogas residue treatment. The pyrolysis system does not require external auxiliary fuel for normal operation.
The whole system has no peculiar smell. No odor.
Example 6
The yield of domestic garbage in a certain county is 200t/d, and the scale of incineration disposal facilities is too small; the amount of the screened organic garbage is 80t/d, and the water content is 75 percent. The scale of anaerobic treatment facilities is small. The wet garbage dehydration pyrolysis method and the system as shown in figure 2 are adopted to dehydrate 80t/d organic garbage and then pyrolyze the organic garbage together with oversize dry garbage. The system comprises wet garbage 1, an extrusion dehydration device 2, a pyrolysis device 3, a high-temperature flue gas generation device 4, a liquid phase substance 7 obtained by primary dehydration, a vacuum suction device 8, flue gas 9 generated by a pyrolysis system, a condensation device 10, first self-evaporation condensed water 11, second self-evaporation condensed water 12, exhaust gas 13, a gas phase substance 14 obtained by tertiary dehydration and waste gas 15.
In the embodiment, the undersize organic garbage 1 is sent into an extrusion dehydration device 2, and the extrusion dehydration device 2 is selected from a hydraulic drive dehydrator, and the hydraulic pressure is 5-20 MPa. When feeding materials, the organic garbage 1 is mixed with the flue gas 9 with waste heat near an inlet, finally the mixture is heated to 95-99 ℃ in an extrusion dehydration device 2, the mixture is maintained for 15min under 5-10MPa, repeated actions of pressure release and pressurization are carried out in the process, then the pressure is increased to 20MPa for dehydration, the moisture content is reduced to be below 49% after the wet-heat extrusion dehydration, the discharged gas 13 in the pressure relief process of the extrusion dehydration device 2 enters a condensing device 10 for condensation to generate first self-evaporation condensed water 11, and the garbage 38t/d of solid phase substances obtained by secondary dehydration is sent to the feed end of a pyrolysis device 3 and is pyrolyzed together with oversize substances after being mixed. And a vacuum air extractor 8 is arranged behind the discharge end of the extrusion dehydration device 2, a gas phase 14 obtained by three times of dehydration after pressure release is further extracted, the gas phase enters a condenser 10 for condensation, then second self-evaporation condensate water 12 and first self-evaporation condensate water 11 are recycled, and waste gas 15 in the extrusion dehydration device 2 enters a condensing device for condensation in the flue gas temperature rise process, and then is further sent into the high-temperature flue gas generation device 4 for treatment. The pyrolysis unit 3 may be selected from rotary kiln type pyrolysis units of the prior art. The high-temperature flue gas generated by the high-temperature flue gas generating device 4 is sent into the pyrolysis furnace 3 to be heated and then discharged, and a part of the flue gas is discharged for treatment; a small part of the waste is directly introduced into the extrusion dehydration device 2, the flow rate of the waste is controlled by the temperature of the organic waste in the extrusion dehydration device 2, when the temperature of the waste is lower than 85 ℃, a valve on a large flue gas pipeline is opened, and the flow rate of the flue gas introduced into the extrusion dehydration device 2 is increased; and when the temperature of the garbage is lower than 95 ℃, closing a valve on the flue gas pipeline and stopping introducing the flue gas. Heating the garbage to 95-99 ℃. And then exhausting, collecting and spraying, and discharging the non-condensable gas after plasma deodorization. Collecting the liquid phase substance 7 obtained by primary dehydration, wherein the total amount is 42t/d, and discharging after anaerobic treatment. The generated biogas is utilized by the high temperature flue gas generator 4. Compared with the construction of pyrolysis and anaerobic treatment facilities after the garbage separation of 200t/d, the required site and investment of the treatment process are reduced by more than 25 percent. And the problem of biogas residue treatment is avoided. The pyrolysis system does not require external auxiliary fuel for normal operation.
The whole system has no peculiar smell and no odor emission.
Wherein the condensing device 10 is selected from a tube condenser of Wuxi Youda chemical plant manufacturing Limited; the vacuum suction device 8 is a negative pressure draught fan with-130 Pa; the pyrolysis apparatus 3 may be selected from any pyrolysis carbonization apparatus in the prior art, such as a rotary kiln type pyrolysis apparatus, a screw propulsion type pyrolysis apparatus, and the like. The high-temperature flue gas generation device 4 is selected from a combustion furnace.
example 7
The yield of the household garbage and the garden garbage in a vegetable field of a certain area is 120t/d, and the comprehensive water content is 78%. The scale of anaerobic treatment facilities is small, and part of garden garbage is not easy to be subjected to anaerobic fermentation. The wet garbage dehydration pyrolysis method shown in figure 1 is adopted, organic garbage 1 of 120t/d is dehydrated and then pyrolyzed together with dry garbage of oversize. The wet garbage hydrothermal dehydration decomposition system shown in fig. 1 comprises wet garbage 1, an extrusion dehydration device 2, a pyrolysis device 3, a high-temperature flue gas generation device 4, a waste heat boiler 5, water vapor 6 generated by a pyrolysis system, a liquid phase substance 7 obtained by primary dehydration, a vacuum suction device 8, flue gas 9 generated by the pyrolysis system, a condensation device 10, first self-evaporation condensed water 11, second self-evaporation condensed water 12, exhaust gas 13 and a gas phase substance 14 obtained by tertiary dehydration. And additionally arranging 1 crusher for crushing garden garbage.
the extrusion dehydration device 2 is selected from a hydraulic drive dehydrator, and the hydraulic pressure is 5-20 MPa. The device is matched with a set of 50t/d pyrolysis device 3, the pyrolysis device 3 is selected from rotary kiln pyrolysis devices, a high-temperature flue gas generating device 4 is used as a combustion furnace, high-temperature flue gas which can be generated is used for heating, a vacuum suction device 8 is a negative pressure induced draft fan with-130 Pa, and a condensing device 10 is a shell and tube condenser. Arranging a waste heat boiler 5, wherein the steam pressure of water generated by using high-temperature flue gas 9 as a heat source is 0.5 MPa; heating the fed wet garbage 1 in an extrusion dehydration device 2 with a steam input hole to 95-99 ℃, maintaining the temperature for 20min under 5-10MPa, repeatedly releasing pressure and pressurizing during the period, then increasing the pressure to 20MPa for dehydration to reduce the water content to about 48%, allowing the discharged gas 13 in the pressure releasing process of the extrusion dehydration device 2 to enter a condensing device 10 for condensation to obtain first self-evaporation condensate water 11, conveying the garbage of the solid phase obtained by secondary dehydration to the feeding end of a pyrolysis device 3, arranging a vacuum suction port 8 at the feeding end of the pyrolysis device 3, pumping away the garbage of the solid phase obtained by secondary dehydration after further pressure releasing in a gas phase 14 obtained by three times of dehydration in the process of conveying the garbage of the solid phase obtained by secondary dehydration to the pyrolysis device 3, condensing the gas phase 14 obtained by three times of dehydration to obtain second self-evaporation condensate water 12, and the first self-evaporation condensate water 11 for recycling in a tubular condenser, the liquid phase material 7 obtained by primary dehydration is sent to anaerobic treatment. The dehydrated wet garbage is independently pyrolyzed and carbonized in the pyrolysis device 3, the generated volatile matter is combusted in the high-temperature flue gas generator 4, the generated high-temperature flue gas is sent into the pyrolysis furnace 3 to be heated and then is discharged into the waste heat boiler 5, and water vapor 6 generated in a part of pyrolysis system is sent into the extrusion dehydration device 2 to be used for heating and warming the wet garbage in the extrusion dehydration device 2. The process generates no waste gas, and only generates 71 tons/d (carrying 1.77 tons of solid) of liquid phase material 7 waste water obtained by primary dehydration. The waste water can be discharged after anaerobic treatment, the generated marsh gas is used by the high-temperature smoke generating device 4, and compared with the anaerobic treatment facility independently constructed by wet garbage of 120t/d, the anaerobic treatment of the waste water reduces the required site and investment by more than 65 percent. And the biogas residue treatment is not needed, and the whole system has no peculiar smell and odor. The pyrolysis system does not require external auxiliary fuel for normal operation.
Example 8
The yield of wet domestic garbage in a certain area is 50t/d, and the comprehensive water content is 80%. And 30t/d of papermaking waste. In the wet waste dehydration pyrolysis system shown in fig. 3, wet waste 1 is dehydrated by the squeezing and dehydrating device 2 and then pyrolyzed together with paper-making waste. The generated gas is sent to a steam boiler of a paper mill for utilization. No steam is used on site.
In this embodiment, the wet waste 1 is fed into the extrusion dehydration unit 2, the extrusion dehydration unit 2 is selected from a screw-driven extrusion dehydrator, and the highest pressure applied to the wet waste reaches 15 MPa. An electric heating component is arranged on the outer wall surface of the spiral, the temperature of the wet garbage in the extrusion dehydration device 2 is heated to 99-101 ℃ through the outer cylinder wall, the garbage stays for 20min under the pressure of about 5MPa, and the repeated actions of pressure release and pressurization are carried out during the process, then, the driving power is increased to extrude the garbage to be 15MPa, the moisture content is reduced to be below 50% after the wet heat extrusion dehydration, the exhaust gas 13 enters a condensing device 10 (the condensing device is a condenser) to be condensed in the pressure relief process to generate first self-evaporation condensed water 11, the solid phase substance obtained by the secondary dehydration is sent to the feeding end of a pyrolysis device 3, a vacuum air extractor 8 is arranged at the feeding end of the pyrolysis device 3, the vacuum air extractor 8 is a draught fan with the negative pressure of 130Pa, the gas phase substance 14 obtained by the third dehydration and further generated by the solid phase substance obtained by the secondary dehydration after the pressure relief is pumped away, and the condensed second self-evaporation condensed water 12 and the first self-evaporation condensed water 11 are recycled. The liquid phase material 7 obtained by primary dehydration is sent to anaerobic treatment, and the odor is sent to a high-temperature smoke generator 4 (the high-temperature smoke generator is a combustion furnace designed according to the output of volatile matters) or directly discharged outside. The solid phase substance obtained by the third dehydration and the paper making garbage are pyrolyzed and carbonized in the pyrolysis device 3, the pyrolysis device 3 can be selected from a rotary kiln type pyrolysis device in the prior art, and the disposal capacity is designed to be 50 t/d. The high-temperature flue gas generated by the high-temperature flue gas generator 4 is sent to the pyrolysis device 3 for heating and then discharged to a flue gas heat recovery device of a paper mill, and the combustible gas generated by the system is purified and then sent to a steam boiler of the paper mill for combustion. The generated waste water is collected, about 31 tons (containing 1 ton of solid matters such as silt) is discharged after anaerobic treatment, and the methane generated by anaerobic treatment is recycled to a steam boiler of a paper mill. The system is simple, and the whole system has no peculiar smell. No odor. The pyrolysis system does not require external auxiliary fuel for normal operation.
Example 9
The total amount of green grass harvested in summer in a certain airport is 180t/d, and the comprehensive water content is 85 percent. The wet garbage dewatering and pyrolyzing method as shown in FIG. 3 is adopted, green grass is coarsely chopped and dewatered by an extrusion dewatering device 2, and then pyrolyzed, and the produced biochar is utilized on the spot in an airport. The occupation of land is desirably small. No steam is used on site.
In the embodiment, the wet garbage 1 is fed into an extrusion dehydration device 2, the extrusion dehydration device 2 is selected from a ring-shaped hydrodynamically-driven extrusion dehydrator, an electric heating component is arranged in an inner cylinder, and finally the highest pressure applied to the wet garbage reaches 10 MPa. The temperature of the green grass is heated to 99-101 ℃ through the inner cylinder wall, the green grass stays for 10min under the pressure of about 10MPa, pressure releasing and pressurizing are carried out repeatedly during the process, then the driving power is increased to extrude the green grass to be 20MPa, the moisture content is reduced to 45% after the green grass is dewatered through damp-heat extrusion, the exhaust gas 13 enters a condensing device 10 (the condensing device is a spray tower type condenser) in the pressure relief process to be condensed to generate first self-evaporation condensate water 11, the solid phase obtained by secondary dewatering is sent to the feeding end of a pyrolysis device 3, a vacuum suction device 8 is arranged at the feeding end of the pyrolysis device 3, the vacuum suction device 8 is a negative pressure draught fan with the pressure of-130 Pa, and the gas phase 14 obtained by the tertiary dewatering is pumped away and sent to the condensing device 10. The first self-evaporation condensate water 11 and the second self-evaporation condensate water 12 generated after condensation are cooled in the system and then recycled for circulation of the spray tower type condensing device. And feeding the solid phase obtained by the third dehydration into a pyrolysis device 3 for pyrolysis and carbonization, wherein the pyrolysis device 3 can be selected from a spiral propulsion type pyrolysis device in the prior art, and the disposal capacity is designed to be 50 t/d. The high-temperature flue gas generated by the high-temperature flue gas generating device 4 is sent into the pyrolysis device 3 to be heated and then discharged, and the combustible gas generated by the system is purified and then sent into the high-temperature flue gas generating device 4 to be combusted so as to supply heat for the pyrolysis system. The generated waste water is about 130 tons/day and is used for irrigating the lawn of the airport on site. The system is simple, and the whole system has no peculiar smell. No odor. The pyrolysis system does not require external auxiliary fuel for normal operation.
The wet garbage dehydrating and pyrolyzing method can be applied to cities for implementing garbage classified collection to treat wet garbage; and can also be used for treating all garbage in small and medium-sized cities. Can also be used for treating traditional Chinese medicine residues, biogas residues after anaerobic fermentation, biomass agricultural and forestry wastes and the like. Preferably, wet garbage such as kitchen garbage is treated. In addition, the extrusion dehydration device can be combined with a combustion furnace, the wet garbage is deeply dehydrated and then is sent into the combustion furnace, and particularly, the pyrolysis gasification combustion furnace which is currently used in villages and towns is favorable for increasing the stability and reliability of combustion, more effectively reduces pollutants, and saves investment and operation cost.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. a method for dehydrating and pyrolyzing wet garbage, comprising the steps of:
1) extruding the wet garbage (1), wherein the temperature condition of the extrusion treatment is 85-101 ℃, the extrusion pressure condition is 5-10MPa, and the time is 10-20 min;
2) further increasing the extrusion pressure to above 10MPa to complete primary dehydration treatment to provide a solid phase substance obtained by primary dehydration and a liquid phase substance (7) obtained by primary dehydration;
3) carrying out pressure relief treatment on the dehydration system of the primary dehydration treatment to provide a solid phase substance obtained by secondary dehydration and exhaust gas (13), and carrying out condensation treatment on the exhaust gas (13) to provide first self-evaporation condensed water (11);
4) Carrying out tertiary dehydration on the solid phase substance obtained by the secondary dehydration in the step 3) to provide a solid phase substance obtained by the tertiary dehydration and a gas phase substance (14) obtained by the tertiary dehydration, wherein the pressure condition of the tertiary dehydration is normal pressure;
5) Condensing the gas phase (14) obtained by the third dehydration provided by the step 4) to provide second self-evaporation condensed water (12);
6) Carrying out pyrolysis treatment on the solid phase substance obtained by the three times of dehydration provided by the step 4).
2. The wet refuse dehydrolysis method according to claim 1, wherein at least a portion of the flue gas (9) generated in the pyrolysis system of step 6) is used to raise the temperature of the wet refuse (1) to 85-101 ℃.
3. The wet refuse dehydrolysis method according to claim 1, wherein at least a portion of the water vapor (6) generated in the pyrolysis system of step 6) is used to raise the temperature of the wet refuse (1) to 85-101 ℃.
4. The wet waste dewatering and pyrolysis method according to claim 1, characterized in that the press dewatering system heats the wet waste (1) to 85-101 ℃ by electric heating or heat conducting oil heating.
5. The wet waste dewatering and pyrolysis method according to claim 1, characterized in that the pressing pressure of the wet waste (1) is up to 5-10MPa by the pressing system through hydraulic or screw pressing.
6. The wet refuse dehydrolysis process according to claims 1 and 2, further comprising one or more of the following technical features:
A1) Carrying out anaerobic treatment on the liquid phase substance (7) obtained by the primary dehydration;
A2) recycling the drained water after the first self-evaporation condensed water (11) and the second self-evaporation condensed water (12);
A3) When the temperature of the flue gas (9) generated in the pyrolysis system is increased, the waste gas (15) discharged by the extrusion dehydration system in the temperature increasing process is condensed and then treated by the generated flue gas.
7. a wet-waste hydrothermal system for use in the method of any one of claims 1 to 6, comprising: the extrusion dehydration device (2), the extrusion dehydration device (2) is used for extruding and primary dehydration treatment of the wet garbage (1) to provide a solid phase material obtained by primary dehydration and a liquid phase material (7) obtained by primary dehydration, and the extrusion dehydration device (2) after the primary dehydration treatment is subjected to pressure relief treatment to provide a solid phase material obtained by secondary dehydration and exhaust gas (13);
a vacuum suction device (8), wherein the vacuum suction device (8) is used for sucking the solid phase substance obtained by the secondary dehydration to provide a solid phase substance obtained by the tertiary dehydration and a gas phase substance (14) obtained by the tertiary dehydration;
The condensing device (10) is used for condensing the exhaust gas (13) in the pressure relief process in the extrusion dehydration device (2) after the primary dehydration and the gas phase (14) obtained by the tertiary dehydration;
And the pyrolysis device (3) is used for carrying out pyrolysis treatment on the solid-phase substance obtained by the three times of dehydration.
8. The wet refuse hydrothermal dehydropyrolysis system according to claim 7, wherein the vacuum suction device (8) is in communication with a discharge end of the extrusion dehydration device (2); the condensing device (10) is in fluid communication with the press dewatering device (2), and the vacuum suction device (8) is in fluid communication with the condensing device (10); the feeding end of the pyrolysis device (3) is communicated with a vacuum suction device (8).
9. The wet refuse hydrothermal dehydropyrolysis system according to claim 7, wherein the extrusion dehydration apparatus (2) is internally provided with a temperature adjusting apparatus and a pressure adjusting apparatus; the system further comprises a high-temperature flue gas generation device (4), wherein an exhaust port of the high-temperature flue gas generation device (4) is communicated with an air inlet of the pyrolysis device (3), and an exhaust port of the pyrolysis device (3) is communicated with an air inlet of the high-temperature flue gas generation device (4).
10. the wet refuse hydrothermal dehydropyrolysis system of claim 8, further comprising one or more of the following technical features:
B1) The temperature adjusting device is a flue gas inlet channel or a water vapor inlet channel, and the extrusion dehydration device (2) is provided with a flue gas inlet channel or a water vapor inlet channel;
B2) The temperature adjusting device is an electric heating assembly or a heat conducting oil assembly, and the electric heating assembly or the heat conducting oil assembly is arranged in the extrusion dehydration device;
B3) An air outlet of the condensing device (10) is communicated with an air inlet of the high-temperature flue gas generating device (4);
B4) volatile matters generated in the pyrolysis device (3) generate flue gas through a high-temperature flue gas generation device (4);
B5) When the temperature of the flue gas (9) generated in the pyrolysis system is increased, the waste gas (15) discharged by the extrusion dehydration device (2) in the temperature increasing process is condensed by the condensing device (10) and then is subjected to high-temperature flue gas treatment by the high-temperature flue gas generating device (4);
B6) The pyrolysis device (3) is communicated with the waste heat boiler (5), and the steam pressure of water generated by the waste heat boiler (5) is 0.3-0.5 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910853529.0A CN110564431B (en) | 2019-09-10 | 2019-09-10 | Wet garbage dehydration pyrolysis method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910853529.0A CN110564431B (en) | 2019-09-10 | 2019-09-10 | Wet garbage dehydration pyrolysis method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110564431A true CN110564431A (en) | 2019-12-13 |
| CN110564431B CN110564431B (en) | 2024-07-12 |
Family
ID=68778836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910853529.0A Active CN110564431B (en) | 2019-09-10 | 2019-09-10 | Wet garbage dehydration pyrolysis method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110564431B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112013638A (en) * | 2020-07-30 | 2020-12-01 | 国网山东省电力公司电力科学研究院 | Garbage drying system and method utilizing flue gas waste heat |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101850351A (en) * | 2010-05-10 | 2010-10-06 | 中国科学院广州能源研究所 | Novel method for generating electricity by pyrolysis and incineration of waste |
| CN102578688A (en) * | 2012-03-15 | 2012-07-18 | 唐清波 | Processing equipment and processing technique for poultry feather protein powder |
| WO2013052583A2 (en) * | 2011-10-04 | 2013-04-11 | Lenew Holdings, Inc. | Systems and methods for converting sewage sludge into a combustible fuel |
| CN104508093A (en) * | 2012-05-17 | 2015-04-08 | 河在炫 | Environmentally friendly and high efficiency solid fuel production method using high-water-content organic waste, and combined heat and power system using same |
| CN106122969A (en) * | 2016-06-29 | 2016-11-16 | 中环蓝天（厦门）物联网科技有限公司 | One way of life rubbish thermal source combined drying technique |
-
2019
- 2019-09-10 CN CN201910853529.0A patent/CN110564431B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101850351A (en) * | 2010-05-10 | 2010-10-06 | 中国科学院广州能源研究所 | Novel method for generating electricity by pyrolysis and incineration of waste |
| WO2013052583A2 (en) * | 2011-10-04 | 2013-04-11 | Lenew Holdings, Inc. | Systems and methods for converting sewage sludge into a combustible fuel |
| CN102578688A (en) * | 2012-03-15 | 2012-07-18 | 唐清波 | Processing equipment and processing technique for poultry feather protein powder |
| CN104508093A (en) * | 2012-05-17 | 2015-04-08 | 河在炫 | Environmentally friendly and high efficiency solid fuel production method using high-water-content organic waste, and combined heat and power system using same |
| CN106122969A (en) * | 2016-06-29 | 2016-11-16 | 中环蓝天（厦门）物联网科技有限公司 | One way of life rubbish thermal source combined drying technique |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112013638A (en) * | 2020-07-30 | 2020-12-01 | 国网山东省电力公司电力科学研究院 | Garbage drying system and method utilizing flue gas waste heat |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110564431B (en) | 2024-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103449701B (en) | Method and device for refinery sludge carbonization treatment and carbon recovery | |
| CN101844859B (en) | Complete steam low-temperature thermally tempering and drying device and method for sludge | |
| CN105180170B (en) | A kind of MSW cooperates with burning electricity generation system | |
| CN1863606B (en) | Thermolysis of organic waste in a ball furnace | |
| CN106746468A (en) | A kind of sludge treating system and handling process | |
| CN102537973A (en) | Novel process for pyrolysis of solid wastes | |
| WO2016091169A1 (en) | Method and apparatus for disposing organic refuse | |
| CN109028079B (en) | System for pyrolysis and gasification of biomass waste and cascade utilization of waste heat thereof | |
| CN101457147A (en) | No-oxygen pyrolysis gasification processing device of urban domestic garbage and technique thereof | |
| CN109485228A (en) | A kind of synergic processing process that sludge is combined with rubbish | |
| JP4404867B2 (en) | Waste treatment equipment | |
| CN110052481A (en) | A kind of kitchen and rubbish from cooking drying process device and method | |
| CN107777853A (en) | Double dry method sludge treatment equipments | |
| CN216521686U (en) | Industrial treatment device for kitchen garbage | |
| CN201753303U (en) | Steam low-temperature quenching and tempering complete sludge drying device | |
| CN110564431B (en) | Wet garbage dehydration pyrolysis method and system | |
| CN201852110U (en) | Sludge low-temperature themolysis incineration system | |
| KR101051093B1 (en) | High Function Organic Sludge Dryer Using Water-In-oil Evaporation Technology at Normal Pressure | |
| CN214400192U (en) | Municipal sludge pyrolysis treatment system | |
| CN211771073U (en) | Wet garbage dehydration pyrolysis system | |
| CN210304995U (en) | Kitchen and kitchen garbage drying treatment device | |
| CN209685556U (en) | A kind of organic sludge as resources utilizes total system | |
| CN101613613B (en) | Efficient heat energy utilization method used during fast thermal cracking of straw | |
| CN203411452U (en) | Sludge carbonization and carbon recovery device for oil refinery | |
| CN110526543A (en) | A kind of system and method coupling coal-fired incineration disposal suitable for sludge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |