CN112944368B - Industrial wastewater incineration treatment system and process - Google Patents
Industrial wastewater incineration treatment system and process Download PDFInfo
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- CN112944368B CN112944368B CN202110219731.5A CN202110219731A CN112944368B CN 112944368 B CN112944368 B CN 112944368B CN 202110219731 A CN202110219731 A CN 202110219731A CN 112944368 B CN112944368 B CN 112944368B
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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 spraying 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 an industrial wastewater incineration treatment process.
Background
Waste water incineration is a relatively common technique, such as the treatment of high-salt waste water from acrylonitrile production processes. Semi-coke wastewater is one of the most difficult wastewater to treat in all industrial wastewater, and although the corresponding specification of the technical Specification of the coking wastewater treatment engineering of HJ2022-2012 indicates that the wastewater can be treated by adopting an incineration method, related researches and patent applications are not seen. Semi-coke is a semi-coke product prepared from low-metamorphic coal at 600-800 ℃ through a carbonization process, and a certain amount of wastewater, namely semi-coke wastewater, can be generated in the processes of gas purification, coke quenching and the like in the semi-coke production process. The semi-coke wastewater is similar to coking wastewater and contains a large amount of monocyclic and polycyclic aromatic compounds such as phenols, benzene, esters and the like, and azide compounds such as pyridine, quinoline, ammonia nitrogen and the like, but due to lower carbonization temperature, the COD of the semi-coke wastewater is about 10 times of that of the coking wastewater, the concentration of ammonia nitrogen and phenols is far higher than that of the coking wastewater, the biodegradability is poor, the treatment difficulty is extremely high, and no mature semi-coke wastewater treatment process technology with lower operation cost exists at home and abroad so far. The basic idea of current semi-coke wastewater treatment is mainly to recover pollutants or valuable chemicals from high-concentration wastewater, and the process comprises airtight oil removal, dephenolization, ammonia distillation and the like. In the sealed oil separation stage, oil, water and slag can be separated, the floating oil is discharged into a recovery oil tank periodically, the oil sludge at the bottom of the tank is discharged into a sludge tank periodically, and the wastewater is sent into a dephenolization flotation machine. The wastewater treated by the dephenolization flotation machine is sent into a deamination tower for deamination treatment, the wastewater after physical and chemical pretreatment hardly reaches the standard of the quenching reuse water, 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.
Patent CN201711027093.7 (2017) discloses a semi-coke wastewater pretreatment and advanced treatment process, which comprises the steps of degreasing, deacidifying, deaminizing and dephenolizing to obtain pretreated wastewater, and subsequent biochemical treatment. The patent CN201710776546.X (2017) discloses a method for recovering phenol and ammonia from semi-coke wastewater, which comprises the steps of firstly realizing gravity degreasing and separation recovery (upper light oil and tank bottom heavy oil) through standing, filtering effluent through a coke filter to remove oil residue, coke powder and tar pollutants, then entering an extraction pre-degreasing, then removing and recovering acid gas, ammonia and phenol in the wastewater through stripping deacidification, ammonia distillation and extraction treatment, entering a biochemical treatment system after treatment, converting phenols in an extraction phase into sodium phenolate through alkaline washing treatment of an extracted phenol-rich organic phase, realizing separation of an extractant and the phenols, and preparing crude phenol and sodium salt through entering an acidification section from a sodium phenolate solution. The invention application CN201910348137.9 (2019) discloses a multistage countercurrent extraction dephenolization and extractant negative pressure type recovery method of semi-coke wastewater. The invention application CN201911314440.3 (2019) discloses a method for recovering phenol from semi-coke wastewater by adopting a complexing extractant. The invention application CN202010913955.1 (2020) discloses a pretreatment method before phenol and ammonia recovery of semi-coke wastewater, which comprises the steps of preliminary oil removal (gravity sedimentation, prefiltering, demulsification and coalescence), deep oil removal (aeration deamination, dosing mixing, standing, flat ceramic membrane and concentration filtration), tail gas absorption treatment (a first absorption device and a second absorption device) and the like, and is used for pretreatment of oil removal and particle removal before a phenol and 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 and dephenolization and oil removal, steam stripping and deacidification, extractant recovery, alkali addition steam stripping and deamination, extractant regeneration and the like.
Regardless of the operation and combination thereof employed, studies generally suggest that the introduction of advanced oxidation techniques has a great necessity to enhance biodegradability, such as photochemical oxidation, wet catalytic oxidation, ozone oxidation, electrochemical oxidation, fenton oxidation, and the like, due to the recalcitrance of semi-coke wastewater and the low BOD/COD characteristics. The overlong process flow leads to very high equipment investment and running cost and exceeds the profit and loss balance point of enterprises, so that the current treatment of semi-coke wastewater by chemical and biochemical means can be cautiously said to meet the bottleneck that is almost difficult to surmount, namely, the wastewater can not reach the standard to be discharged with lower cost, and extremely high cost is required. The introduction of thermal technology (gasification/pyrolysis/incineration) and the treatment of semi-coke wastewater by a more disciplinary fusion scheme are helpful to simplify the process flow and have the potential to reduce the cost, and the treatment efficiency is greatly improved. The national environmental protection standard of coking wastewater treatment engineering technical Specification also gives a guidance opinion of semicoke (semi coke) wastewater, and under the condition of reasonable technical economy, the wastewater can be treated by adopting an incineration method according to relevant regulations. However, the technical scheme of Guan Lantan wastewater incineration is relatively lacking, and the difficulties of the incineration process mainly lie in the key problems of NOx emission, refractory corrosion, slag bonding on the surface of the 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 the production of certain heat energy by introducing other low-grade fuels, and utilize the rectification type drying principle to realize the separation of light and heavy components 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 then reclaimed water is recycled for coke quenching, and the low-nitrogen combustion is realized by utilizing the selective non-catalytic reduction SNCR principle.
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 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 carbonization 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 communicated with the oxidation zone and the incineration zone so as to supply air required by gasification and incineration;
the heat recovery device comprises a boiler, the flue gas generated by the incineration of the gasification incineration device is led out from a high-temperature flue gas pipeline and is led into the boiler, and the steam generated by the boiler is sent to a steam deamination working section from a steam output pipeline;
the water washing spray device comprises a multi-stage water washing spray tower, and the high-temperature flue gas after heat release of the heat recovery device is led out from a low-temperature flue gas pipeline and is sent to the multi-stage water washing spray tower, and the flue gas after water washing spray is discharged through a normal-temperature flue gas pipeline.
The industrial wastewater incineration treatment system as described above, further, a feeder is provided between the drying zone and the incineration zone, and the wastewater supply unit includes a lifter that lifts fuel from the ground to a bin of the feeder.
The industrial wastewater incineration treatment system as described above, further, the wastewater supply unit includes a wastewater tank which is led out through a wastewater feed main pipe, wherein one path of wastewater is connected with a bin of the feeder through a wastewater feed 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 feed branch pipe b.
The industrial wastewater incineration treatment system further comprises a water-cooling jacket structure for the hearth at the oxidation zone and the reduction zone, an aluminum silicate ceramic fiber heat-insulating structure for the hearth at the carbonization zone and the drying zone, and carbon steel or stainless steel metal for the inner walls of the carbonization zone and the drying zone; the burning zone is configured as a combustion chamber, the combustion chamber adopts a water-cooling jacket structure, and the combustion chamber is made of carbon steel plates.
According to the industrial wastewater incineration treatment system, further, the cooling water of the water cooling jacket structure is introduced from the cooling water pipeline, softened water is adopted as the cooling water, and the cooling water passing through the combustion chamber is heated and then introduced into the boiler from the boiler water supply pipeline.
The industrial wastewater incineration treatment system further comprises the wastewater feeding branch pipeline a and the wastewater feeding branch pipeline b which are respectively laid with an insulation layer, and the high-temperature flue gas pipeline is laid with the insulation layers.
The industrial wastewater incineration treatment system further comprises a gas boiler or a waste heat boiler, wherein the boiler is horizontal or vertical.
The industrial wastewater incineration treatment system further comprises a multistage water washing spray tower, wherein the water used by the multistage water washing spray tower is process water obtained by cooling/absorbing incineration flue gas, and the process water is recycled through a circulating water pipeline by a circulating water pump; the flue gas after washing and spraying 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 a system as described in any one of the above, comprising
The fuel adopts massive or granular agricultural and forestry waste, the feed is carried out by a screw conveyor, the running temperature of an oxidation zone is 800-900 ℃, the temperature of airflow above a drying zone is 100-120 ℃, the temperature of an incineration zone is 1100-1300 ℃, the air supply part is the oxidation zone and the incineration zone, the water-cooling jacket water outlet temperature of the incineration zone is 70-90 ℃, the flue gas outlet temperature of a boiler is 130-160 ℃, and the flue gas outlet temperature of a multi-stage water-washing spray device is less than or equal to 50 ℃;
raw water of semi-coke wastewater or semi-coke wastewater pretreatment concentrated liquid from a wastewater tank enters a drying area of the gasification incineration device through a wastewater feeding pipeline, wherein the wastewater feeding pipeline is of a double-channel design, namely a stokehole solid-liquid mixed feeding channel and a direct injection feeding channel in a furnace, and the wastewater feeding proportion and 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 using waste and produces a certain heat energy by introducing other low-grade fuels, utilizes the rectification type drying principle to realize the separation of light and heavy components of 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 then recycled, and the recycled water can 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 of the embodiments of the present invention, the following description will briefly explain the drawings needed in the embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an industrial wastewater incineration treatment system according to the present invention.
Reference numerals illustrate: 101. a gasification incineration device; 102. a feeder; 103. a water-cooled 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 extractor; 111. a water feed pump; 112. a circulation pump; 201. a main wastewater feed pipe; 202. a waste water feeding pipeline a; 203. a wastewater feed line b; 204. a cooling water pipe; 205. a boiler feed water pipe; 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 pipe; 212. a normal temperature flue gas pipeline; 213. a reclaimed water recycling 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 following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Examples:
it should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations 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 or inherent to such process, method, article, or apparatus.
It is to be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like are directional or positional relationships as indicated based on the drawings, merely to facilitate describing the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an industrial wastewater incineration treatment system according to the present invention, in which an incineration process is adopted to treat semi-coke wastewater, other low-grade fuels are introduced to provide necessary heat sources for incineration, low NOx emission is achieved through a special design and operation mode, and inorganic components in wastewater or evaporated concentrate are recovered, so that refractory corrosion and heat exchange surface slagging are reduced, and the problems of the prior art, which may be faced with in the future, and the bottleneck existing in the prior art can be at least partially solved.
The semi-coke wastewater incineration treatment system comprises a gasification incineration device 101, a heat recovery device and a water washing spraying device, wherein the gasification incineration device 101 comprises a combustion tower, a blower 106, a fuel supply unit and a wastewater supply unit, the combustion tower is sequentially provided with an oxidation zone 301, a reduction zone 302, a carbonization zone 303, a drying zone 304 and an incineration zone 305 from the lower part to the upper part, the bottom of the combustion tower is provided with a slag extractor 110, the fuel supply unit is used for supplying fuel to the gasification incineration device 101, the wastewater supply unit is used for supplying wastewater for incineration treatment to the gasification incineration device 101, and an air outlet of the blower 106 is respectively communicated with the oxidation zone 301 and the incineration zone 305 so as to supply air required by gasification and incineration;
the heat recovery device comprises a boiler 107, wherein flue gas generated by the incineration of the gasification incineration device 101 is led out from a high-temperature flue gas pipeline 206 and is led into the boiler 107, and 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, and the high-temperature flue gas after heat release of 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 after water washing spray 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 waste water supply unit comprises a hoist 105, the hoist 105 lifting fuel from the ground to a silo of the feeder 102.
As an alternative embodiment, in some embodiments the waste water supply unit comprises a waste water basin 104, which waste water basin 104 is led out through a waste water feed main pipe 201 and wherein one waste water is connected to the silo of the feeder 102 via a regulating valve through a waste water feed branch pipe a and the other waste water is connected to the upper furnace wall of the drying zone 304 of the gasification incinerator 101 via a regulating valve through a spray gun through a waste water feed branch pipe b.
As an alternative embodiment, in some examples, the hearths at the oxidation zone 301 and the reduction zone 302 are in a water-cooling jacket structure, the hearths at the carbonization zone 303 and the drying zone 304 are in an aluminum silicate ceramic fiber heat-insulating structure, and the inner walls of the carbonization zone 303 and the drying zone 304 are made of carbon steel or stainless steel metal; the incineration zone 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.
As an alternative embodiment, in some examples, the cooling water of the water-cooling jacket structure is introduced from the cooling water pipe 204 and the cooling water is softened water, and the cooling water passing through the combustion chamber is heated and then introduced from the water supply pipe of the boiler 107 to the boiler 107.
As an alternative embodiment, in certain examples, both the waste water feed branch conduit a and the waste water feed branch conduit b are insulation coated, and the high temperature flue gas conduit 206 is insulation coated.
As an alternative embodiment, in some examples, 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 the process water obtained by cooling/absorbing the incineration flue gas, and the process water is recycled through the circulating water pipe 211 by the circulating water pump; the flue gas after water washing and spraying is led out by the induced draft fan 109 through the normal temperature flue gas pipeline 212 and is sent to a 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 multi-time air supply design; the heat recovery replacement heat pipe 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 materials or is provided with a corrosion-resistant lining to prevent acid corrosion.
An industrial wastewater incineration treatment process for a system as described in any one of the above, comprising
The fuel adopts massive or granular agricultural and forestry waste, the feed is carried out by a screw conveyor, the running temperature of an oxidation zone is 800-900 ℃, the temperature of airflow above a drying zone is 100-120 ℃, the temperature of an incineration zone is 1100-1300 ℃, the air supply part is the oxidation zone and the incineration zone, the water-cooling jacket water outlet temperature of the incineration zone is 70-90 ℃, the flue gas outlet temperature of a boiler is 130-160 ℃, and the flue gas outlet temperature of a multi-stage water-washing spray device is less than or equal to 50 ℃;
raw water of semi-coke wastewater or semi-coke wastewater pretreatment concentrated liquid from a wastewater tank enters a drying area of the gasification incineration device through a wastewater feeding pipeline, wherein the wastewater feeding pipeline is of a double-channel design, namely a stokehole solid-liquid mixed feeding channel and a direct injection feeding channel in a furnace, and the wastewater feeding proportion and time sequence are adjusted according to the furnace temperature condition.
Further, the effluent of the multi-stage water washing spray device meets the reclaimed water recycling requirement, and pH, SS, CODCr, ammonia nitrogen, volatile phenol and cyanide of the multi-stage water washing spray device meet the corresponding requirements of the water pollutant emission concentration limit of the existing enterprise on the indirect emission limit of the GB 16171-2012 coking chemical industry pollutant emission standard when the multi-stage water washing spray device is used for quenching.
Further, the emission concentration of the atmospheric pollutant particles, sulfur dioxide and nitrogen oxides of the flue gas at the outlet of the multistage water washing spray device meets the corresponding requirements of the atmospheric pollutant emission concentration limit value of a new enterprise on a coke oven chimney.
Further, the recovery ratio of the wastewater is not lower than 95%, and the clear water proportion in the wastewater recovered by reclaimed water recycling is used as a calculation basis.
Further, the ratio of the total low-level heating value of the fuel and the wastewater which are recovered by the heat recovery device (boiler) of the system heat efficiency is not less than 60 percent.
Further, the gasified solid residues are fished by adopting a wet method, and a small amount of water required is recycled by adopting water in a multi-stage water washing spray device.
The application of the invention is further illustrated by the following examples.
Example 1
A semi-coke wastewater incineration treatment system. As shown in fig. 1, a gasification incineration device 101 for combusting agricultural and forestry waste salix psammophila (a sand control plant, which needs to be periodically stumping and rejuvenating) receives the fuel design consumption of the salix psammophila by 2 tons/hour; the main body of the gasification incineration device 101 is at a height of 8.5m from the lower edge of a sleeve of the feeder 102 to the upper edge of the slag extractor 110, and a bucket elevator 105 is used for lifting fuel from the ground to a bin of the feeder 102; air flowThe inner diameter of the main body of the chemical incineration device 101, namely the inner diameter of the section of the hearth at the oxidation zone 301, the reduction zone 302, the carbonization zone 303 or the drying zone 304 is 2.6m; the hearths at the oxidation area 301 and the reduction area 302 adopt water-cooling jacket structures, the hearths at the carbonization area 303 and the drying area 304 adopt aluminum silicate ceramic fiber heat-preserving structures, and the inner wall is made of carbon steel or stainless steel metal; the combustion chamber 103 adopts a water-cooling jacket structure, the material is carbon steel plate, the height of the combustion chamber 103 is 3.6m, the jacket is filled with water from a cooling water pipeline 204, and the cooling water adopts softened water; air required for gasification and incineration is provided by the 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, wherein the primary air pipeline 208 and the secondary air pipeline 207 can also adopt independent blowers; the wastewater pool 104 is a factory public wastewater pool, the wastewater main feeding pipeline 201 is provided with an insulation layer, the wastewater main feeding pipeline 201 is connected with a wastewater main feeding pipeline a202 and a wastewater main feeding pipeline b203 through a tee joint, the wastewater main feeding pipelines a and b are provided with insulation layers, the wastewater main feeding pipeline a is connected with a feed bin of the feeder 102 through a regulating valve, the wastewater main feeding pipeline b is connected with an upper furnace wall of a drying area 304 of the gasification incineration device 101 through a spray gun through a regulating valve, and the spray gun is 1 or more; the flue gas generated by incineration is led out from a high-temperature flue gas pipeline 206 and is led into a boiler 107, the high-temperature flue gas pipeline 206 is laid with an insulation layer, 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 the cooling water of the water-cooled combustion chamber 103 is heated, the cooling water 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 is sent to a multi-stage water washing spray tower 108, wherein the multi-stage water washing spray tower is 4 stages; the multi-stage water washing spray tower 108 uses water as process water obtained by cooling/absorbing incineration flue gas, and the process water is recycled through a circulating water pipe 211 by a circulating water pump 112; the flue gas after washing and spraying is led out by a draught 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 draught fan 109Rated flow 15000m 3 /h。
Example two
A blue charcoal waste water incineration treatment process. As shown in FIG. 1, the gasification incineration device 101 for the fuel agricultural and forestry waste salix psammophila receives the fuel consumption of the basic salix psammophila 2t/h, the operation temperature of the oxidation zone 301 is 890 ℃, the air flow temperature above the drying zone is 110 ℃, the incineration zone is 1100 ℃, and the air quantity of the primary air pipeline 208 is 2100m 3 /h, the air quantity of the secondary air pipeline 207 is 8050m 3 And/h, the jacket water outlet temperature of the water-cooled combustion chamber 103 is 85 ℃, the low-temperature flue gas pipeline 210 shows the flue gas outlet temperature 142 ℃ of the boiler 107, and the normal-temperature flue gas pipeline 212 shows the flue gas outlet temperature 45 ℃ of the multi-stage water-washing spray tower 108. The raw water of the semi-coke wastewater from the wastewater pool 104 enters the drying area 304 of the gasification incineration device 101 through the main wastewater feeding pipeline 201 and the wastewater feeding pipeline a202, the other path of wastewater enters the drying area 304 of the gasification incineration device 101 through the wastewater feeding pipeline b203, the proportion of the wastewater entering the gasification incineration device 101 through the wastewater feeding pipeline b203 is 5-20%, and the wastewater is automatically or manually adjusted according to the temperature of the airflow above the drying area 304. The contents of COD, ammonia nitrogen, volatile phenol, oil and cyanide in the raw water of 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 COD, ammonia nitrogen, volatile phenol, oil and cyanide contents of the effluent of the multistage water 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 flue gas discharge pipeline 214 monitors the discharge concentration of the particulate matters, sulfur dioxide and nitrogen oxides of 25mg/L, 42mg/L and 135mg/L. The recovery ratio of the waste water is 95%, and the thermal efficiency of the system is 62%.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. An industrial wastewater incineration treatment process is used for an industrial wastewater incineration treatment system, the system comprises a gasification incineration device, a heat recovery device and a washing spray 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 carbonization 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 communicated with the oxidation zone and the incineration zone so as to supply air required by gasification and incineration;
the heat recovery device comprises a boiler, the flue gas generated by the incineration of the gasification incineration device is led out from a high-temperature flue gas pipeline and is led into the boiler, and the steam generated by the boiler is sent to a steam deamination working section from a steam output pipeline;
the water washing spray device comprises a multi-stage water washing spray tower, and the high-temperature flue gas after heat release of the heat recovery device is led out from a low-temperature flue gas pipeline and is sent to the multi-stage water washing spray tower, and the flue gas after water washing spray is discharged through a constant-temperature flue gas pipeline;
the waste water supply unit comprises a waste water pond, the waste water pond is led out through a waste water feeding main pipeline, one waste water is connected with a feed bin of the feeder through a waste water feeding branch pipeline a by a regulating valve, and the other waste water is connected with an upper furnace wall of a drying area of the gasification incineration device through a spray gun through a regulating valve by a waste water feeding branch pipeline b; the hearth at the oxidation area and the reduction area adopts a water-cooling jacket structure, the hearth at the carbonization area and the drying area adopts an aluminum silicate ceramic fiber heat insulation structure, and the inner walls of the carbonization area and the drying area are made of carbon steel or stainless steel metal; the incineration area is configured as a combustion chamber, the combustion chamber adopts a water-cooling jacket structure, the combustion chamber is made of carbon steel plates, the water used by the multi-stage water-washing spray tower 108 is process water obtained by cooling/absorbing incineration flue gas, and the process water is recycled through a circulating water pipeline by a circulating water pump; the flue gas after washing and spraying 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;
the process comprises the following steps:
the fuel adopts massive or granular agricultural and forestry waste, the feed is carried out by a screw conveyor, the running temperature of an oxidation zone is 800-900 ℃, the temperature of airflow above a drying zone is 100-120 ℃, the temperature of an incineration zone is 1100-1300 ℃, the air supply part is the oxidation zone and the incineration zone, the water-cooling jacket water outlet temperature of the incineration zone is 70-90 ℃, the flue gas outlet temperature of a boiler is 130-160 ℃, and the flue gas outlet temperature of a multi-stage water-washing spray device is less than or equal to 50 ℃;
raw water of semi-coke wastewater or semi-coke wastewater pretreatment concentrated liquid from a wastewater tank enters a drying area of the gasification incineration device through a wastewater feeding pipeline, wherein the wastewater feeding pipeline is of a double-channel design, namely a stokehole solid-liquid mixed feeding channel and a direct injection feeding channel in a furnace, and the wastewater feeding proportion and time sequence are adjusted according to the furnace temperature condition.
2. The industrial wastewater incineration treatment process according to claim 1, wherein a feeder is provided between the drying zone and the incineration zone, and the wastewater supply unit includes a lifter that lifts fuel from the ground to a silo of the feeder.
3. The industrial wastewater incineration treatment process according to claim 1, wherein cooling water of the water-cooling jacket structure is introduced from a cooling water pipe and softened water is adopted 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 pipe.
4. The industrial wastewater incineration treatment process according to claim 1, wherein the wastewater feed branch pipe a and the wastewater feed branch pipe b are each laid with an insulation layer, and the high-temperature flue gas pipe is laid with an insulation layer.
5. The industrial wastewater incineration treatment process according to claim 1, wherein the boiler is a gas boiler or a waste heat boiler and the boiler is horizontal or vertical.
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| JPH11287416A (en) * | 1998-03-31 | 1999-10-19 | Mitsubishi Materials Corp | Kiln type gasification incinerator |
| CN1587812A (en) * | 2004-10-15 | 2005-03-02 | 丁宝太 | Destructive gasifying incinerator |
| CN205332223U (en) * | 2016-01-18 | 2016-06-22 | 北京光耀环境工程有限公司 | Heat conduction formula garbage pyrolytic gasifier |
| CN105889949B (en) * | 2016-04-19 | 2017-11-10 | 山东聊城中盛蓝瑞化工有限公司 | A kind of organic wastewater burns gasification system and burns gasification process |
| CN106398773A (en) * | 2016-11-18 | 2017-02-15 | 北京金泰瑞和工程科技有限公司 | Pressurized gasification system for fixed bed |
| CN106318467A (en) * | 2016-11-18 | 2017-01-11 | 北京金泰瑞和工程科技有限公司 | Gasification reactor and gasification system |
| CN107655010B (en) * | 2017-10-18 | 2024-04-05 | 厦门东江环保科技有限公司 | Industrial waste dry distillation gasification pyrolysis treatment system |
| CN109945211B (en) * | 2019-02-20 | 2021-04-30 | 上海电力学院 | Burning treatment method and system for semi-coke pyrolysis waste gas and waste liquid |
| CN109825315A (en) * | 2019-03-14 | 2019-05-31 | 石欣 | A kind of cooling coke and sewage gasification burning processing unit and method |
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