CN112797777A - Sludge heat pump drying system and method - Google Patents
Sludge heat pump drying system and method Download PDFInfo
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- CN112797777A CN112797777A CN201911106098.8A CN201911106098A CN112797777A CN 112797777 A CN112797777 A CN 112797777A CN 201911106098 A CN201911106098 A CN 201911106098A CN 112797777 A CN112797777 A CN 112797777A
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- heat pump
- carbon dioxide
- dryer
- sludge
- drying
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- 238000001035 drying Methods 0.000 title claims abstract description 97
- 239000010802 sludge Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title abstract description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 114
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 57
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 57
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000001704 evaporation Methods 0.000 claims abstract description 18
- 230000008020 evaporation Effects 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims description 21
- 238000009413 insulation Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007791 dehumidification Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
- F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
- F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
- F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/02—Applications of driving mechanisms, not covered by another subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to the technical field of drying equipment, and discloses a sludge heat pump drying system and a method, wherein the sludge heat pump drying system comprises: a dryer and a carbon dioxide heat pump system; the carbon dioxide heat pump system comprises a compressor, an air cooling assembly, a throttle valve and an evaporation assembly which are sequentially connected, wherein the working medium of the carbon dioxide heat pump system is carbon dioxide, the air cooling assembly and the evaporation assembly are arranged in the dryer, the air cooling assembly comprises a plurality of air coolers which are connected in series, and the evaporation assembly comprises a plurality of evaporators which are connected in series. According to the sludge heat pump drying system and method provided by the invention, the carbon dioxide is arranged as the working medium of the heat pump system, the outlet air temperature higher than that of the conventional heat pump system can be obtained, and the plurality of air coolers and the plurality of evaporators are arranged, so that the heat released by the carbon dioxide can be utilized to the maximum extent, the dehumidification rate is effectively improved, the efficiency of the heat pump system is improved, and the energy is saved.
Description
Technical Field
The invention relates to the technical field of drying equipment, in particular to a sludge heat pump drying system and method.
Background
As wastes in industry and life, the main components of the sludge mainly comprise inorganic components, organic particle components, biological thallus components and other colloid components, most of the substances except some harmful substances such as heavy metals can improve the soil fertility, the heat value is higher, and the dried sludge is used for building boards, biological fertilizers, fuels and the like. Common sludge drying modes comprise high-temperature thermal drying, vacuum drying, radiation drying and the like, and the problems of large initial investment of equipment, high drying energy consumption, high operation cost and the like exist.
The low-temperature thermal drying technology represented by the heat pump sludge drying technology is a better sludge treatment means, can obviously reduce the volume of sludge, has stable product property, and has no odor and no pathogenic organisms; the sludge product after drying treatment has multiple purposes, can adapt the characteristics of the sludge to the requirements of wider treatment and disposal processes, and is a sludge treatment method which is worth popularizing.
The existing heat pump sludge drying technology is limited by the working temperature of a heat pump, and the dehumidification rate of the heat pump sludge drying technology is still to be improved.
Disclosure of Invention
The embodiment of the invention provides a sludge heat pump drying system and a sludge heat pump drying method, which are used for solving or partially solving the problem that the dehumidification rate of the existing heat pump sludge drying technology is still to be improved due to the limitation of the working temperature of a heat pump.
The embodiment of the invention provides a sludge heat pump drying system, which comprises: a dryer and a carbon dioxide heat pump system; the carbon dioxide heat pump system comprises a compressor, an air cooling assembly, a throttle valve and an evaporation assembly which are sequentially connected, wherein the working medium of the carbon dioxide heat pump system is carbon dioxide, the air cooling assembly and the evaporation assembly are arranged in the dryer, the air cooling assembly comprises a plurality of air coolers which are connected in series, and the evaporation assembly comprises a plurality of evaporators which are connected in series.
On the basis of the scheme, a plurality of layers of conveyor belts for conveying the substances to be dried are arranged in the dryer, the air cooling assembly is arranged above the uppermost conveyor belt, and the evaporation assembly is arranged below the lowermost conveyor belt.
On the basis of the scheme, the air coolers and the evaporators are arranged in a one-to-one correspondence manner from top to bottom, and the air coolers and the evaporators are uniformly distributed along the conveying direction of the conveyor belt respectively.
On the basis of the scheme, the dryer further comprises a plurality of first heat insulation layers, the first heat insulation layers divide the interior of the dryer into a plurality of sections along the conveying direction of the conveyor belt, and one air cooler and one evaporator are arranged in any section.
On the basis of the scheme, at least one fan is arranged in any interval and used for driving the drying medium in the interval to circularly flow.
On the basis of the scheme, the carbon dioxide heat pump system further comprises a heat regenerator, and a connecting pipeline between the throttle valve and the air cooler close to the throttle valve and a connecting pipeline between the compressor and the evaporator close to the compressor respectively flow through the heat regenerator to exchange heat.
On the basis of the scheme, the heat regenerator is arranged on one side of the dryer, and a second heat insulation layer is arranged between the heat regenerator and the conveyor belt and inside the dryer.
On the basis of the scheme, the surface of the evaporator is provided with a condensed water collecting disc, and the condensed water collecting discs on the surface of the evaporator are respectively communicated with a condensed water pipe.
On the basis of the scheme, the device also comprises a filter press; the outlet of the filter press is connected with the inlet of the dryer.
The embodiment of the invention provides a sludge heat pump drying method based on the sludge heat pump drying system, which comprises the following steps: heating and dehumidifying the drying medium in the dryer by using a carbon dioxide heat pump system so as to dry the substance to be dried; a multi-stage air cooler and a multi-stage evaporator are arranged in a carbon dioxide heat pump system to carry out multi-stage drying treatment on a substance to be dried; when the material to be dried is subjected to multi-stage drying treatment, circulating air is respectively formed to circularly dry the material to be dried; the running frequency of the compressor in the carbon dioxide heat pump system is 0-50 Hz.
According to the sludge heat pump drying system and method provided by the embodiment of the invention, the carbon dioxide is used as a working medium of the heat pump system, the outlet air temperature is higher than that of a conventional heat pump system, and the plurality of air coolers and the plurality of evaporators are arranged, so that the heat released by the carbon dioxide can be utilized to the maximum extent, the dehumidification rate is effectively improved, the efficiency of the heat pump system is improved, and the energy is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sludge heat pump drying system according to an embodiment of the present invention.
Description of reference numerals:
wherein, 1, a filter press; 2. an air cooler; 3. a dryer; 4. a compressor; 5. an evaporator; 6. a throttle valve; 7. a heat regenerator; 8. a first insulating layer; 9. a second thermal insulation layer; 10. a fan; 11. a substance to be dried; 12. a condensate pipe; 13. a housing.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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 in specific cases to those skilled in the art.
An embodiment of the present invention provides a sludge heat pump drying system, and referring to fig. 1, the sludge heat pump drying system includes: a dryer 3 and a carbon dioxide heat pump system; the carbon dioxide heat pump system comprises a compressor 4, an air cooling assembly, a throttle valve 6 and an evaporation assembly which are sequentially connected, wherein the working medium of the carbon dioxide heat pump system is carbon dioxide, the air cooling assembly and the evaporation assembly are arranged in the drier 3, the air cooling assembly comprises a plurality of air coolers 2 which are connected in series, and the evaporation assembly comprises a plurality of evaporators 5 which are connected in series.
In the heat pump drying system provided in this embodiment, the carbon dioxide heat pump system is adopted to heat and dehumidify the drying medium inside the dryer 3, so as to dry the substance to be dried 11. Compared with other heat pumps, the carbon dioxide heat pump has the advantages of high air outlet temperature, wide operation temperature area, strong environment adaptability and the like.
Carbon dioxide in the heat pump system is condensed at the air cooling component to release heat, and the ambient drying medium can be heated and heated; the carbon dioxide evaporates at the evaporation assembly to absorb heat of the drying medium and condense moisture in the drying medium, so that the effect of dehumidifying the drying medium is achieved; thereby realizing the drying treatment of the substance to be dried 11.
The air cooling component of the heat pump drying system is provided with a plurality of serially connected air coolers 2, so that drying media in the dryer 3 can be heated layer by layer, the outlet temperature of the air coolers 2 is reduced, and the heat of the carbon dioxide heat pump system is fully utilized; the evaporation assembly is provided with a plurality of evaporators 5 which are connected in series, and drying media in the dryer 3 can be cooled and dehumidified layer by layer, so that the dehumidification rate is improved.
The sludge heat pump drying system provided by the embodiment sets up carbon dioxide as the working medium of the heat pump system, can obtain higher air outlet temperature than the conventional heat pump system, and sets up a plurality of air coolers 2 and a plurality of evaporators 5, can furthest utilize the heat of carbon dioxide release, effectively promotes the dehumidification rate, improves the efficiency of heat pump system, the energy saving.
Further, the drying medium is a gaseous medium which is brought into contact with the substance to be dried 11 inside the dryer 3 to dry it; the drying medium may be air, etc., without limitation.
In addition to the above embodiment, the dryer 3 is provided with a plurality of conveyor belts for conveying the material 11 to be dried, the air cooling unit is provided above the uppermost conveyor belt, and the evaporation unit is provided below the lowermost conveyor belt. The dryer 3 is a multi-layer belt dryer 3. The top of the dryer 3 is provided with an inlet for the substance 11 to be dried and the bottom with an outlet.
The air cooling assembly is arranged at the top of the dryer 3, so that the material to be dried 11 with large water content just entering the dryer 3 is in a higher temperature range, which is beneficial to improving the drying efficiency. With evaporation assembly setting in the bottom of desiccator 3, reducible humiture influence to 3 inside waiting to dry material 11 places of desiccator is favorable to keeping the temperature of the inside drying medium of desiccator 3 when guaranteeing the dehumidification rate, improves drying efficiency.
In addition to the above embodiment, the plurality of air coolers 2 and the plurality of evaporators 5 are further arranged in a one-to-one correspondence manner, and the plurality of air coolers 2 and the plurality of evaporators 5 are respectively and uniformly distributed along the conveying direction of the conveyor belt. The conveying direction of the conveyor belt, i.e., the distribution length direction of the material to be dried 11 inside the dryer 3, i.e., the plurality of air coolers 2 and the plurality of evaporators 5 are uniformly distributed in the length direction of the material to be dried 11, respectively. The drying medium can be uniformly heated, cooled and dehumidified, and the drying efficiency and the dehumidification rate can be improved.
On the basis of the above embodiment, further, the dryer further includes a plurality of first heat insulation layers 8, the plurality of first heat insulation layers 8 divide the inside of the dryer 3 into a plurality of sections along the conveying direction of the conveyor belt, and one air cooler 2 and one evaporator 5 are included in any one section.
The air coolers 2 and the evaporators 5 are arranged in a one-to-one vertical correspondence. Each air cooler 2 and its corresponding evaporator 5 are a pair of heat pump assemblies, i.e. a first insulating layer 8 is provided between any adjacent two pairs of heat pump assemblies. I.e. a plurality of first insulating layers 8 are arranged at intervals along the length of the conveyor belt. The first heat insulation layer 8 penetrates through the multilayer conveyor belt and the carbon dioxide heat pump system in the height direction; also running through the conveyor belt in the width direction; the first heat insulation layer 8 can be fixedly connected with the inner wall of the dryer 3.
The plurality of first heat insulating layers 8 divide the inner space of the dryer 3 into a plurality of partitioned sections, each having one air cooler 2 at the top and one evaporator 5 at the bottom. A separate drying medium circulation can be formed in each compartment. The plurality of zones may form a multi-stage drying of the substance 11 to be dried. The heat of the carbon dioxide is fully utilized, and the drying efficiency is improved. The first heat insulating layer 8 is formed of a heat insulating material, and the provision of the first heat insulating layer 8 is also advantageous in maintaining the temperature of the drying medium in each section to sufficiently dry the substance to be dried 11.
On the basis of the above embodiment, further, at least one fan 10 is arranged in any one of the sections, and the fan 10 is used for driving the drying medium located in the section to circularly flow. The drying medium in each interval formed by the first heat insulation layer 8 in a separating mode is driven to circularly flow by the fan 10, the drying medium can be contacted with the substance 11 to be dried for multiple times in a circulating mode, and meanwhile, the drying medium is contacted with the air cooler 2 and the evaporator 5 for multiple times, so that the substance 11 to be dried in each interval can be dried for multiple times in a circulating mode, and the drying efficiency is improved.
Further, one fan 10 may be provided at the top and bottom of each section, respectively, to form a circulation flow of the drying medium in the section. The fan 10 may be fixed by the first insulation layer 8.
On the basis of the above embodiment, further, the carbon dioxide heat pump system further includes a regenerator 7, and the connection pipeline between the throttle valve 6 and the air cooler 2 close to the throttle valve 6 and the connection pipeline between the compressor 4 and the evaporator 5 close to the compressor 4 respectively flow through the regenerator 7 for heat exchange.
The air cooler 2 near the throttle valve 6 is the final stage air cooler 2, and the evaporator 5 near the compressor 4 is the final stage evaporator 5. The carbon dioxide flowing out of the final stage air cooler 2 and the carbon dioxide flowing out of the final stage evaporator 5 exchange heat in the regenerator 7. The carbon dioxide flowing out of the final stage air cooler 2 transfers heat to the carbon dioxide flowing out of the final stage evaporator 5, so that the temperature of the carbon dioxide entering the compressor 4 can be increased, the temperature of the carbon dioxide entering the throttle valve 6 can be reduced, the efficiency of the heat pump system can be improved, the full utilization of energy can be realized, and energy can be saved.
On the basis of the above embodiment, further, the regenerator 7 is disposed on one side of the dryer 3, and a second heat insulation layer 9 is disposed between the regenerator 7 and the conveyor belt and inside the dryer 3. The second heat insulation layer 9 separates the heat regenerator 7 from the material 11 to be dried on the conveyor belt, which is beneficial to maintaining the temperature of the drying medium around the material 11 to be dried and ensures the drying efficiency.
Further, referring to fig. 1, the regenerator 7, the throttle 6, and the compressor 4 may be provided outside the dryer 3; so as to reduce the occupied space of the internal installation of the drying machine 3 and avoid the influence on the internal environment of the drying machine 3. A housing 13 may also be provided to enclose the dryer 3, regenerator 7, throttle 6 and compressor 4, so as to increase the integrity of the drying system for ease of installation.
On the basis of the above embodiment, further, the surface of the evaporator 5 is provided with a condensed water collecting plate, and the condensed water collecting plates on the surface of the plurality of evaporators 5 are respectively communicated with the condensed water pipes 12. The drying medium contacts with the evaporator 5, and the moisture in the drying medium is condensed on the surface of the evaporator 5 to form condensed water, and the condensed water flows into the collecting tray and is collected in the condensed water pipe 12 to be discharged out of the dryer 3.
Further, the drying system further comprises a filter press 1; the outlet of the filter press 1 is connected to the inlet of the dryer 3. The filter press 1 can pre-treat the substance 11 to be dried to reach a moisture content suitable for the treatment of the dryer 3, which is beneficial to improving the drying efficiency.
On the basis of the foregoing embodiments, further, the present embodiment provides a heat pump drying method based on the heat pump drying system of any of the foregoing embodiments, the heat pump drying method including: heating and dehumidifying the drying medium in the dryer 3 by using a carbon dioxide heat pump system to dry the substance 11 to be dried; a multi-stage air cooler 2 and a multi-stage evaporator 5 are arranged in a carbon dioxide heat pump system to carry out multi-stage drying treatment on a substance to be dried 11; when the substance 11 to be dried is subjected to multi-stage drying treatment, circulating air is respectively formed to circularly dry the substance 11 to be dried; the compressor 4 in the carbon dioxide heat pump system operates at a frequency of 0-50 Hz.
On the basis of the above embodiment, further, a heat pump drying system is used for sludge drying, the heat pump drying system comprises a filter press 1, a multi-layer belt dryer 3 and a carbon dioxide heat pump system, wherein an outlet of the filter press 1 is connected with an inlet of the multi-layer belt dryer 3 through a conveying device; the carbon dioxide heat pump system comprises a compressor 4, a first air cooler 2, a second air cooler 2, a third air cooler 2, a throttle valve 6, a first evaporator 5, a second evaporator 5 and a third evaporator 5 which are connected in sequence; the outlet of the third air cooler 2 exchanges heat with the outlet of the third evaporator 5 through a heat exchanger. The heat-resistant air conditioner further comprises 6 high-temperature-resistant circulating fans 10, heat insulation materials are arranged between each pair of the air coolers 2 and the evaporators 5, and condensed water generated after dehumidification of the evaporators 5 is collected together and then discharged out of the system.
The present embodiment provides a heat pump drying method using the heat pump drying system according to the above embodiment, including: utilizing a carbon dioxide heat pump system to generate hot air with the temperature of more than 100 ℃; the running frequency of the compressor 4 in the carbon dioxide heat pump system can be between 0 and 50 Hz; the heat generated by the carbon dioxide is fully utilized by the three-stage air cooler 2, the outlet temperature of the air cooler 2 is reduced as much as possible, and the circulation efficiency is improved; and circularly drying the oil sludge on the conveying belt by using a high-temperature resistant fan 10 between heat insulating materials.
Firstly, sludge with the water content of 80-90 percent can be mechanically compressed and filtered to be 50-80 percent of cake-shaped or strip-shaped by a filter press 1 and then is conveyed to the inlet of a multi-layer belt dryer 3 by a conveying device. Then the compressor 4 is turned on, the carbon dioxide heat pump system is started, and the compressor 4 can operate at the variable frequency of 0-50 Hz. The heat in the air cooler 2 is continuously exchanged by a high temperature resistant circulation fan 10 between heat insulating materials to form a high temperature heat pump and circulates between the multi-layer belt dryers 3. The condensed water in the evaporator 5 is discharged out of the system via a pipe. The dried sludge is transported out of the system (not shown in fig. 1) via a transport mechanism.
The air outlet temperature of the heat pump drying system is higher than that of a conventional heat pump drying system, and the heat released by carbon dioxide can be utilized to the maximum extent, so that the efficiency of the carbon dioxide heat pump system is effectively improved, and the energy is saved; the heat exchange capacity of the carbon dioxide gas cooler 2 is fully utilized, the outlet temperature of the gas cooler 2 is reduced, the efficiency of the carbon dioxide heat pump is improved, and the energy consumption is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A sludge heat pump drying system is characterized by comprising: a dryer and a carbon dioxide heat pump system; the carbon dioxide heat pump system comprises a compressor, an air cooling assembly, a throttle valve and an evaporation assembly which are sequentially connected, wherein the working medium of the carbon dioxide heat pump system is carbon dioxide, the air cooling assembly and the evaporation assembly are arranged in the dryer, the air cooling assembly comprises a plurality of air coolers which are connected in series, and the evaporation assembly comprises a plurality of evaporators which are connected in series.
2. The sludge heat pump drying system of claim 1, wherein the dryer is internally provided with a plurality of layers of conveyor belts for conveying the materials to be dried, the air cooling assembly is arranged above the uppermost conveyor belt, and the evaporation assembly is arranged below the lowermost conveyor belt.
3. The sludge heat pump drying system of claim 2, wherein the plurality of air coolers and the plurality of evaporators are arranged in a one-to-one correspondence in a vertical direction, and the plurality of air coolers and the plurality of evaporators are respectively and uniformly distributed along a conveying direction of the conveyor belt.
4. The sludge heat pump drying system according to claim 2 or 3, further comprising a plurality of first heat insulating layers dividing the inside of the dryer into several sections in the conveying direction of the conveyor belt, and one air cooler and one evaporator are included in any one section.
5. The sludge heat pump drying system according to claim 4, wherein at least one fan is arranged in any one interval, and the fan is used for driving the drying medium in the interval to circularly flow.
6. The sludge heat pump drying system according to claim 2 or 3, wherein the carbon dioxide heat pump system further comprises a regenerator through which a connection pipe between the throttle valve and the air cooler near the throttle valve and a connection pipe between the compressor and the evaporator near the compressor respectively exchange heat.
7. The sludge heat pump drying system of claim 6, wherein the heat regenerator is arranged at one side of the dryer, and a second heat insulation layer is arranged between the heat regenerator and the conveyor belt and inside the dryer.
8. The sludge heat pump drying system of any one of claims 1 to 3, wherein a condensate collecting tray is provided on the surface of the evaporator, and the condensate collecting trays on the surface of the evaporator are respectively communicated with a condensate pipe.
9. The sludge heat pump drying system according to any one of claims 1 to 3, further comprising a filter press; the outlet of the filter press is connected with the inlet of the dryer.
10. A sludge heat pump drying method based on the sludge heat pump drying system of any one of claims 1 to 9, characterized by comprising:
heating and dehumidifying the drying medium in the dryer by using a carbon dioxide heat pump system so as to dry the substance to be dried;
a multi-stage air cooler and a multi-stage evaporator are arranged in a carbon dioxide heat pump system to carry out multi-stage drying treatment on a substance to be dried;
when the material to be dried is subjected to multi-stage drying treatment, circulating air is respectively formed to circularly dry the material to be dried;
the running frequency of the compressor in the carbon dioxide heat pump system is 0-50 Hz.
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| CN201911106098.8A CN112797777B (en) | 2019-11-13 | 2019-11-13 | Sludge heat pump drying system and method |
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| CN201911106098.8A CN112797777B (en) | 2019-11-13 | 2019-11-13 | Sludge heat pump drying system and method |
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