CN112944368A - Industrial wastewater incineration treatment system and process - Google Patents
Industrial wastewater incineration treatment system and process Download PDFInfo
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- CN112944368A CN112944368A CN202110219731.5A CN202110219731A CN112944368A CN 112944368 A CN112944368 A CN 112944368A CN 202110219731 A CN202110219731 A CN 202110219731A CN 112944368 A CN112944368 A CN 112944368A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The invention discloses an industrial wastewater incineration treatment system and process, which relate to the technical field of industrial wastewater treatment and comprise a gasification incineration device, a heat recovery device and a water washing spray device.
Description
Technical Field
The invention relates to the technical field of industrial (coal chemical industry, biomass energy chemical industry and the like) wastewater treatment, in particular to an industrial wastewater incineration treatment system and process.
Background
Waste water incineration is a common technology, such as treatment of waste water with high salt content in acrylonitrile production process. The semi-coke wastewater is one of the wastewater which is almost the most difficult to treat in all industrial wastewater, and although the corresponding specification HJ2022-2012 coking wastewater treatment engineering specification indicates that the incineration method can be adopted, related researches and patent applications are rare. Semi-coke products are prepared from low-metamorphic coal through a dry distillation process at the temperature of 600-800 ℃, and a certain amount of wastewater is generated in the processes of gas purification, coke quenching and the like in the semi-coke production process, and is called semi-coke wastewater. The semi-coke wastewater is similar to coking wastewater, contains a large amount of monocyclic and polycyclic aromatic compounds such as phenols, benzenes, esters and the like, and azide compounds such as pyridine, quinoline, ammonia nitrogen and the like, but due to the low dry distillation temperature, the COD (chemical oxygen demand) of the semi-coke wastewater is usually about 10 times of that of the coking wastewater, the concentrations of the ammonia nitrogen and the phenols are far higher than that of the coking wastewater, the biodegradability is poor, the treatment difficulty is high, and no mature semi-coke wastewater treatment process technology with low operation cost exists at home and abroad so far. The basic idea of semi-coke wastewater treatment at present is to recover pollutants or valuable chemicals from high-concentration wastewater, and the processes comprise closed oil separation, dephenolization, ammonia distillation and the like. Generally, in the closed oil separation stage, the separation of oil, water and slag can be realized, the floating oil is periodically discharged into a recovery oil tank, the oil sludge at the bottom of the tank is periodically discharged into a sludge tank, and the wastewater is sent into a dephenolization flotation machine. The wastewater treated by the dephenolizing flotation machine is sent to a deamination tower for deamination treatment, the wastewater after physicochemical pretreatment is difficult to reach the coke quenching reuse water standard, COD and ammonia nitrogen are still high, the biochemical treatment difficulty is still high, and further adjustment or treatment is needed to improve the biodegradability.
Granted patent CN201711027093.7(2017) discloses a pretreatment and advanced treatment process for semi-coke wastewater, which comprises degreasing, deacidifying, deamination, dephenolization to obtain pretreated wastewater, and a subsequent biochemical treatment process. Granted patent CN201710776546.X (2017) discloses a method for recovering phenol and ammonia from semi-coke wastewater, which comprises the steps of firstly realizing gravity oil removal and separation recovery (upper light oil and tank bottom heavy oil) by standing, filtering effluent by a coke filter to remove oil residue, coke powder and tar pollutants, then performing extraction pre-oil removal, then removing and recovering acid gas, ammonia and phenol in the wastewater by stripping deacidification, ammonia distillation and extraction treatment, feeding the treated wastewater into a biochemical treatment system, converting phenols in an extraction phase into sodium phenolate by alkali washing treatment of a phenol-rich organic phase obtained by extraction, realizing separation of an extracting agent and phenols, and feeding a sodium phenolate solution into an acidification section to prepare crude phenol and sodium phenolate. The invention application CN201910348137.9(2019) discloses a multistage countercurrent extraction dephenolization and extraction agent negative pressure type recovery method for semi-coke wastewater. The invention application CN201911314440.3(2019) discloses a method for recovering phenol from semi-coke wastewater by using a complexing extraction agent. The invention application CN202010913955.1(2020) discloses a pretreatment method before recovery of semi-coke wastewater phenol ammonia, which comprises the steps of primary oil removal (gravity settling, prefiltering, demulsification and coalescence), deep oil removal (aeration deamination, medicine adding and mixing, standing, flat ceramic membrane and concentration and filtration), tail gas absorption treatment (a first absorption device and a second absorption device) and the like, and is used for oil removal and particle removal pretreatment before a phenol ammonia recovery section. The invention application CN202010614575.8(2020) discloses a semi-coke wastewater pretreatment method, which comprises the steps of oil removal and dust removal, extraction dephenolization and oil removal, stripping deacidification, extractant recovery, alkali addition, stripping deamination, extractant regeneration and the like.
Whatever the procedure and combination thereof, it is generally considered that, due to the difficult degradation and low BOD/COD characteristics of semi-coke wastewater, the introduction of advanced oxidation technology is necessary to improve the biodegradability, such as photochemical oxidation, wet catalytic oxidation, ozone oxidation, electrochemical oxidation, Fenton oxidation, and the like. The overlong process flow causes very high equipment investment and operation cost, and exceeds the profit and loss balance point of enterprises, so that cautiously, the semi-coke wastewater is treated by chemical and biochemical means at present and meets the bottleneck which is difficult to exceed, namely, the wastewater can not be discharged up to the standard at lower cost, and very high cost must be paid. The introduction of thermal technology (gasification/pyrolysis/incineration) and the treatment of semi-coke wastewater by a more multidisciplinary fusion scheme is beneficial to simplifying the process flow and has the potential of reducing the cost, and the treatment efficiency is greatly improved. The national environmental protection standard "technical specification of coking wastewater treatment project" also gives guidance "semicoke (semi-coke) wastewater, and under the condition of reasonable technical economy, the semicoke wastewater can be treated by adopting an incineration method according to relevant regulations". However, the technical scheme related to burning of semi-coke wastewater is still relatively lacked, and the difficulty of the burning process mainly lies in several key problems of NOx emission, refractory material corrosion, slagging on the surface of a heat exchange tube and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an industrial wastewater incineration treatment system and process, which realize the treatment of waste by waste and produce certain heat energy by introducing other low-grade fuels, and utilize the rectification type drying principle to separate light components and heavy components of the wastewater in a gasification/incineration device, wherein the heavy components comprise high-boiling-point organic matters, alkali, salt and the like, the light components comprise low-boiling-point organic matters, water and the like, the organic matters are degraded into carbon dioxide, water and other small components by gasification/incineration, a large amount of water vapor is condensed and recycled to be sent to coke quenching, and the selective non-catalytic reduction SNCR principle is utilized to realize low-nitrogen combustion.
In order to achieve the aim, the invention provides a semi-coke wastewater incineration treatment system which comprises a gasification incineration device, a heat recovery device and a water washing and spraying device,
the gasification incineration device comprises a combustion tower, a blower, a fuel supply unit and a waste water supply unit, wherein the combustion tower is sequentially provided with an oxidation zone, a reduction zone, a dry distillation zone, a drying zone and an incineration zone from the lower part to the upper part, the bottom of the combustion tower is provided with a slag extractor, the fuel supply unit is used for supplying fuel to the gasification incineration device, the waste water supply unit is used for supplying waste water for incineration treatment to the gasification incineration device, and an air outlet of the blower is respectively introduced into the oxidation zone and the incineration zone so as to provide air required by gasification and incineration;
the heat recovery device comprises a boiler, the smoke generated by the incineration of the gasification incineration device is led out from a high-temperature smoke pipeline and introduced into the boiler, and the steam generated by the boiler is sent to a steam deamination working section from a steam output pipeline;
the washing spray device comprises a multistage washing spray tower, high-temperature flue gas discharged by the heat recovery device is led out from a low-temperature flue gas pipeline and is sent to the multistage washing spray tower, and the flue gas sprayed by washing is discharged through a normal-temperature flue gas pipeline.
The industrial wastewater incineration treatment system comprises a drying area, an incineration area and a wastewater supply unit, wherein the drying area is arranged above the incineration area, the wastewater supply unit comprises a lifting machine, and the lifting machine lifts fuel from the ground to a bin of the feeding machine.
The industrial wastewater incineration treatment system comprises a wastewater pool, wherein the wastewater pool is led out through a main wastewater feeding pipeline, one path of wastewater is connected with a bin of a feeder through a wastewater feeding branch pipeline a via a regulating valve, and the other path of wastewater is connected with an upper furnace wall of a drying area of a gasification incineration device through a spray gun through a regulating valve via a wastewater feeding branch pipeline b.
In the system for incinerating industrial wastewater, the furnace chambers at the oxidation zone and the reduction zone are of water-cooling jacket structures, the furnace chambers at the dry distillation zone and the drying zone are of aluminum silicate ceramic fiber heat-preservation structures, and the inner walls of the dry distillation zone and the drying zone are made of carbon steel or stainless steel metal; the incineration area is configured to be a combustion chamber, the combustion chamber adopts a water-cooling jacket structure, and the combustion chamber is made of carbon steel plates.
In the above incineration system for industrial wastewater, further, the cooling water of the water-cooling jacket structure is introduced from a cooling water pipeline and softened water is used as the cooling water, and the cooling water passing through the combustion chamber is heated and then introduced into the boiler from a boiler water supply pipeline.
According to the industrial wastewater incineration treatment system, further, the wastewater feeding branch pipeline a and the wastewater feeding branch pipeline b are both provided with the heat insulation layers, and the high-temperature flue gas pipeline is provided with the heat insulation layers.
According to the industrial wastewater incineration treatment system, the boiler is a gas boiler or a waste heat boiler and is horizontal or vertical.
In the industrial wastewater incineration treatment system, the water used by the multistage water washing spray tower is process water obtained by cooling/absorbing incineration flue gas, and is recycled by a circulating water pump through a circulating water pipeline; the flue gas sprayed by washing is led out by a draught fan through a normal temperature flue gas pipeline and is sent to a coke oven chimney through a flue gas discharge pipeline.
An industrial wastewater incineration treatment process for the system as any one of the above, comprising
The fuel adopts blocky or granular agricultural and forestry wastes, and is fed by a screw conveyor, wherein the operating temperature of an oxidation area is 800-;
raw semi-coke wastewater or concentrated semi-coke wastewater pretreatment liquid from a wastewater pool enters a drying area of a gasification incineration device through a wastewater feeding pipeline, the wastewater feeding pipeline is of a double-channel design, namely a solid-liquid mixed feeding channel in front of a furnace and a direct injection feeding channel in the furnace, and the wastewater feeding proportion and the time sequence are adjusted according to the furnace temperature condition.
Compared with the prior art, the invention has the beneficial effects that: the invention realizes the treatment of waste by waste and the production of certain heat energy by introducing other low-grade fuels, and utilizes the rectification type drying principle to separate light and heavy components of the waste water in a gasification/incineration device, wherein the heavy components comprise high boiling point organic matters, alkali, salt and the like, the light components comprise low boiling point organic matters, water and the like, the organic matters are degraded into carbon dioxide, water and other small components through gasification/incineration, a large amount of water vapor is condensed and recycled to be sent to coke quenching, and the low-nitrogen combustion is realized by utilizing the selective non-catalytic reduction SNCR principle.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view showing the construction of an industrial wastewater incineration system according to the present invention.
Description of reference numerals: 101. a gasification incineration device; 102. a feeder; 103. water-cooling the combustion chamber; 104. a wastewater tank; 105. a hoist; 106. a blower; 107. a boiler; 108. a multi-stage water washing spray tower; 109. an induced draft fan; 110. a slag discharging machine; 111. a feed pump; 112. a circulation pump; 201. a main wastewater feed line; 202. a wastewater feed line a; 203. a wastewater feed line b; 204. a cooling water pipeline; 205. a boiler feed water conduit; 206. a high temperature flue gas duct; 207. a secondary air duct; 208. a primary air duct; 209. a steam output pipe; 210. a low temperature flue gas duct; 211. a circulating water pipeline; 212. a normal temperature flue gas pipeline; 213. a reclaimed water reuse pipeline; 214. a flue gas discharge duct; 301. an oxidation zone; 302. a reduction zone; 303. a dry distillation zone; 304. a drying zone; 305. an incineration zone.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
Example (b):
it should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an industrial wastewater incineration treatment system of the present invention, which proposes to treat semi-coke wastewater by an incineration process, introduce other low-grade fuels to provide a necessary heat source for incineration, achieve low NOx emission through a special design and operation mode, recover inorganic components in the wastewater or evaporated concentrated solution, reduce corrosion of refractory materials and slagging on heat exchange surfaces, and at least partially solve the bottleneck existing in the prior art and the problems that may be faced when the incineration technique is adopted in the future.
A blue charcoal waste water incineration processing system, includes gasification incineration device 101, heat reclamation device and washing spray set, gasification incineration device 101 includes combustion tower, air-blower 106, fuel supply unit and waste water supply unit, the combustion tower is equipped with oxidation zone 301, reduction zone 302, dry distillation zone 303, dry zone 304 and burning zone 305 in proper order and the bottom of combustion tower is equipped with mucking machine 110 from lower part to upper portion, the fuel supply unit is used for providing fuel for gasification incineration device 101, waste water supply unit provides the gasification incineration device 101 with the waste water that is used for incineration disposal, the air outlet of air-blower 106 lets in respectively oxidation zone 301 and burning zone 305 to provide the required air of gasification and burning;
the heat recovery device comprises a boiler 107, the flue gas generated by the incineration of the gasification incineration device 101 is led out from a high-temperature flue gas pipeline 206 and introduced into the boiler 107, and the steam generated by the boiler 107 is sent to a steam deamination working section from a steam output pipeline 209;
the water washing spray device comprises a multi-stage water washing spray tower 108, high-temperature flue gas discharged by the heat recovery device is led out from a low-temperature flue gas pipeline 210 and is sent to the multi-stage water washing spray tower 108, and the flue gas sprayed by water washing is discharged through a normal-temperature flue gas pipeline 212.
As an alternative embodiment, in some embodiments, a feeder 102 is provided between the drying zone 304 and the incineration zone 305, and the wastewater supply unit comprises a hoist 105, and the hoist 105 lifts fuel from the ground to the silo of the feeder 102.
As an alternative embodiment, in some embodiments, the waste water supply unit comprises a waste water basin 104, the waste water basin 104 is led out through a main waste water feeding pipe 201, wherein one path of waste water is connected to the bin of the feeding machine 102 through a waste water feeding branch pipe a via a regulating valve, and the other path of waste water is connected to the upper furnace wall of the drying zone 304 of the gasification incineration device 101 through a spray gun through a regulating valve through a waste water feeding branch pipe b.
As an alternative embodiment, in some embodiments, the furnace chambers at the oxidation zone 301 and the reduction zone 302 adopt a water-cooling jacket structure, the furnace chambers at the dry distillation zone 303 and the drying zone 304 adopt an aluminum silicate ceramic fiber heat preservation structure, and the inner walls of the dry distillation zone 303 and the drying zone 304 are made of carbon steel or stainless steel metal; the incineration area 305 is configured as a combustion chamber, the combustion chamber adopts a water-cooling jacket structure, and the material of the combustion chamber is carbon steel plate.
In an alternative embodiment, in some embodiments, the cooling water of the water-cooling jacket structure is introduced from the cooling water pipeline 204 and the cooling water is softened water, and the cooling water passing through the combustion chamber is heated and then introduced into the boiler 107 from the water supply pipeline of the boiler 107.
As an alternative embodiment, in some embodiments, the wastewater feeding branch pipe a and the wastewater feeding branch pipe b are both provided with an insulating layer, and the high temperature flue gas pipe 206 is provided with an insulating layer.
As an alternative embodiment, in some embodiments, the boiler 107 is a gas boiler 107 or a waste heat boiler 107, and the boiler 107 is horizontal or vertical.
As an alternative implementation manner, in some embodiments, the water used in the multi-stage water-washing spray tower 108 is process water obtained by cooling/absorbing incineration flue gas, and is recycled by a circulating water pump through a circulating water pipeline 211; the flue gas sprayed by washing is led out by the draught fan 109 through the normal temperature flue gas pipeline 212 and is sent to the coke oven chimney through the flue gas discharge pipeline 214.
Further, the incineration area 305 is provided with a water-cooling jacket structure, the gasification oxidation area 301 can be provided with a water-cooling jacket structure or refractory materials, and the gasification incineration device 101 adopts a multiple air supply design; the heat exchange tube of the heat recovery device can adopt an acid-resistant and corrosion-resistant design, and does not need to adopt a salt-resistant and corrosion-resistant design; the multistage water-washing spray device can be made of glass fiber reinforced plastic or has a design of an anti-corrosion lining to prevent acid corrosion.
An industrial wastewater incineration treatment process for the system as any one of the above, comprising
The fuel adopts blocky or granular agricultural and forestry wastes, and is fed by a screw conveyor, wherein the operating temperature of an oxidation area is 800-;
raw semi-coke wastewater or concentrated semi-coke wastewater pretreatment liquid from a wastewater pool enters a drying area of a gasification incineration device through a wastewater feeding pipeline, the wastewater feeding pipeline is of a double-channel design, namely a solid-liquid mixed feeding channel in front of a furnace and a direct injection feeding channel in the furnace, and the wastewater feeding proportion and the time sequence are adjusted according to the furnace temperature condition.
Further, the effluent of the multi-stage water-washing spray device meets the requirement of reclaimed water recycling, and when the multi-stage water-washing spray device is used for quenching coke, the pH value, the SS, the CODCr, the ammonia nitrogen, the volatile phenol and the cyanide meet the corresponding requirement of the existing enterprise water pollutant emission concentration limit value to the indirect emission limit value in GB 16171-2012 coking chemical industry pollutant emission standard.
Furthermore, the emission concentrations of the atmospheric pollutant particles, sulfur dioxide and nitrogen oxides in the flue gas at the outlet of the multistage water washing spray device meet the corresponding requirements of the emission concentration limit values of the atmospheric pollutants of newly-built enterprises on coke oven chimneys.
Furthermore, the wastewater recovery rate is not lower than 95%, and the proportion of clean water in the wastewater recycled by reclaimed water is used as a calculation basis.
Further, the system thermal efficiency, namely the proportion of the total low-level calorific value of the fuel and the wastewater converted by the heat recovery device (boiler) is not less than 60%.
Furthermore, the gasified solid residue is fished by a wet method, and a small amount of water is recycled by using reclaimed water of a multi-stage water washing and spraying device.
The invention is further illustrated by the following examples.
Example one
A semi-coke waste water incineration treatment system. As shown in figure 1, a gasification incineration device 101 for burning salix mongolica (a desertification control plant, which needs to be regularly stubbled and rejuvenated) agricultural and forestry waste is designed to consume 2 tons/hour after receiving basic salix mongolica fuel; the height of the main body of the gasification incineration device 101, namely the distance from the lower edge of the sleeve of the feeder 102 to the upper edge of the slag extractor 110 is 8.5m, and the fuel is lifted to a storage bin of the feeder 102 from the ground by a bucket elevator 105; the inner diameter of the hearth section of the main body of the gasification incineration device 101, namely the inner diameter of the oxidation zone 301, the reduction zone 302, the dry distillation zone 303 or the drying zone 304 is 2.6 m; the hearths at the oxidation zone 301 and the reduction zone 302 adopt water-cooling jacket structures, the hearths at the dry distillation zone 303 and the drying zone 304 adopt aluminum silicate ceramic fiber heat-preservation structures, and the inner walls of the hearths are made of carbon steel or stainless steel metal; the combustion chamber 103 is of a water-cooling jacket structure, the material is a carbon steel plate, the height of the combustion chamber 103 is 3.6m, jacket water is introduced from a cooling water pipeline 204, and the cooling water is softened water; the air needed for gasification and incineration is provided by a blower 106 and is introduced into the oxidation zone 301 and the incineration zone 305 through a primary air pipeline 208 and a secondary air pipeline 207, and the primary air pipeline 208 and the secondary air pipeline 207 can adopt independent blowers; the wastewater pool 104 is a common wastewater pool in a plant area, the main wastewater feeding pipeline 201 is laid with a heat insulation layer, the main wastewater feeding pipeline 201 is connected with a branch wastewater feeding pipeline a202 and a branch wastewater feeding pipeline b203 through a tee joint, the branch wastewater feeding pipelines a and b are laid with the heat insulation layer, the branch wastewater feeding pipeline a is connected with a bin of the feeder 102 through a regulating valve, waste water is fed into the bin, and the waste water is discharged into the bin through the regulating valveThe water feeding branch pipelines b are connected with the upper furnace wall of the drying area 304 of the gasification incineration device 101 through regulating valves by spray guns, and the number of the spray guns is 1 or more; the method comprises the following steps that flue gas generated by incineration is led out from a high-temperature flue gas pipeline 206 and introduced into a boiler 107, an insulating layer is laid on the high-temperature flue gas pipeline 206, the high-temperature flue gas pipeline 206 is as short as possible under the condition that space allows, the boiler 107 can be a gas boiler or a waste heat boiler, the boiler 107 can be horizontal or vertical, and the rated evaporation capacity of the boiler 107 is 6 tons/hour; after being heated, the cooling water in the water-cooled combustion chamber 103 is introduced into the boiler 107 from a boiler water supply pipeline 205 through a water supply pump 111; steam generated by the boiler is sent to a steam deamination section from a steam output pipeline 209; the high-temperature flue gas after heat release is led out from a low-temperature flue gas pipeline 210 and sent to a multi-stage washing spray tower 108, wherein the multi-stage washing spray tower is 4 stages; the water used by the multistage water washing spray tower 108 is process water obtained by cooling/absorbing incineration flue gas, and is recycled through a circulating water pipeline 211 by a circulating water pump 112; the flue gas after being washed and sprayed is led out by an induced draft fan 109 through a normal temperature flue gas pipeline 212 and is sent to a coke oven chimney through a flue gas discharge pipeline 214, and the rated flow of the induced draft fan 109 is 15000m3/h。
Example two
A burning treatment process of semi-coke wastewater. As shown in figure 1, when the gasification incineration device 101 for burning the agricultural and forestry waste salix mongolica receives the fuel consumption of the salix mongolica at 2t/h, the operation temperature of an oxidation zone 301 is 890 ℃, the temperature of air flow above a drying zone is 110 ℃, the temperature of an incineration zone is 1100 ℃, and the air volume of a primary air pipeline 208 is 2100m3H, secondary air pipeline 207 air volume 8050m3And h, the water outlet temperature of the jacket of the water-cooled combustion chamber 103 is 85 ℃, the outlet temperature of the flue gas of the boiler 107 is displayed at the position of a low-temperature flue gas pipeline 210, and the outlet temperature of the flue gas of the multistage water-washing spray tower 108 is displayed at the position of a normal-temperature flue gas pipeline 212, wherein the outlet temperature of the flue gas of the multistage water-washing. Raw semi-coke wastewater from the wastewater pool 104 enters a drying area 304 of the gasification incineration device 101 through a wastewater main feeding pipe 201 and a wastewater feeding pipe a202, the other path of wastewater enters the drying area 304 of the gasification incineration device 101 through a wastewater feeding pipe b203, the proportion of the wastewater entering the gasification incineration device 101 through the wastewater feeding pipe b203 is 5-20%, and the raw water is automatically adjusted or manually adjusted according to the temperature of air flow above the drying area 304And (5) adjusting. The contents of COD, ammonia nitrogen, volatile phenol, oil and cyanide in the semi-coke wastewater are 35000mg/L, 4000mg/L, 3600mg/L, 1450mg/L and 24mg/L respectively, and the pH value is 8.1. The contents of COD, ammonia nitrogen, volatile phenol, oil and cyanide in the effluent of the multi-stage washing spray tower 108 sampled by the reclaimed water recycling pipeline 213 are respectively 90mg/L, 15mg/L, 0.5mg/L, 4.0mg/L and 0.1mg/L, and the pH value is 6.7. The emission concentrations of the particulate matters, the sulfur dioxide and the nitrogen oxides monitored by the smoke discharge pipeline 214 are 25mg/L, 42mg/L and 135 mg/L. The wastewater recovery ratio was 95%, and the system thermal efficiency was 62%.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (9)
1. An industrial waste water incineration treatment system, which comprises a gasification incineration device, a heat recovery device and a water washing and spraying device, and is characterized in that,
the gasification incineration device comprises a combustion tower, a blower, a fuel supply unit and a waste water supply unit, wherein the combustion tower is sequentially provided with an oxidation zone, a reduction zone, a dry distillation zone, a drying zone and an incineration zone from the lower part to the upper part, the bottom of the combustion tower is provided with a slag extractor, the fuel supply unit is used for supplying fuel to the gasification incineration device, the waste water supply unit is used for supplying waste water for incineration treatment to the gasification incineration device, and an air outlet of the blower is respectively introduced into the oxidation zone and the incineration zone so as to provide air required by gasification and incineration;
the heat recovery device comprises a boiler, the smoke generated by the incineration of the gasification incineration device is led out from a high-temperature smoke pipeline and introduced into the boiler, and the steam generated by the boiler is sent to a steam deamination working section from a steam output pipeline;
the washing spray device comprises a multistage washing spray tower, high-temperature flue gas discharged by the heat recovery device is led out from a low-temperature flue gas pipeline and is sent to the multistage washing spray tower, and the flue gas sprayed by washing is discharged through a normal-temperature flue gas pipeline.
2. The industrial wastewater incineration treatment system according to claim 1, wherein a feeder is provided between the drying zone and the incineration zone, and the wastewater supply unit includes a hoist that lifts fuel from the ground to a bin of the feeder.
3. The industrial wastewater incineration treatment system according to claim 1, wherein the wastewater supply unit includes a wastewater tank, the wastewater tank is led out through a main wastewater feeding pipe, wherein one path of wastewater is connected with a bin of the feeder through a wastewater feeding branch pipe a via a regulating valve, and the other path of wastewater is connected with an upper furnace wall of a drying zone of the gasification incineration device through a spray gun through a regulating valve through a wastewater feeding branch pipe b.
4. The industrial wastewater incineration treatment system according to claim 1, wherein the furnaces at the oxidation zone and the reduction zone are of water-cooling jacket structures, the furnaces at the dry distillation zone and the drying zone are of aluminum silicate ceramic fiber heat preservation structures, and the inner walls of the dry distillation zone and the drying zone are made of carbon steel or stainless steel metal; the incineration area is configured to be a combustion chamber, the combustion chamber adopts a water-cooling jacket structure, and the combustion chamber is made of carbon steel plates.
5. The industrial wastewater incineration treatment system according to claim 4, wherein the cooling water of the water cooling jacket structure is introduced from a cooling water pipeline and softened water is used as the cooling water, and the cooling water passing through the combustion chamber is heated and then introduced into the boiler from a boiler water supply pipeline.
6. The incineration disposal system for industrial wastewater according to claim 4, wherein the wastewater feeding branch pipe a and the wastewater feeding branch pipe b are each provided with an insulating layer, and the high temperature flue gas pipe is provided with an insulating layer.
7. The incineration disposal system for industrial wastewater according to claim 1, wherein the boiler is a gas boiler or a waste heat boiler and the boiler is horizontal or vertical.
8. The industrial wastewater incineration disposal system according to claim 1, wherein the water used by the multistage water washing spray tower 108 is process water obtained by cooling/absorbing incineration flue gas, and is recycled by a circulating water pump through a circulating water pipeline; the flue gas sprayed by washing is led out by a draught fan through a normal temperature flue gas pipeline and is sent to a coke oven chimney through a flue gas discharge pipeline.
9. An industrial wastewater incineration disposal process for use in the system of any one of claims 1 to 8, comprising
The fuel adopts blocky or granular agricultural and forestry wastes, and is fed by a screw conveyor, wherein the operating temperature of an oxidation area is 800-;
raw semi-coke wastewater or concentrated semi-coke wastewater pretreatment liquid from a wastewater pool enters a drying area of a gasification incineration device through a wastewater feeding pipeline, the wastewater feeding pipeline is of a double-channel design, namely a solid-liquid mixed feeding channel in front of a furnace and a direct injection feeding channel in the furnace, and the wastewater feeding proportion and the time sequence are adjusted according to the furnace temperature condition.
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