CN115401052A - Method for recycling organic waste by using coal water slurry gasification furnace - Google Patents
Method for recycling organic waste by using coal water slurry gasification furnace Download PDFInfo
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- CN115401052A CN115401052A CN202210817773.3A CN202210817773A CN115401052A CN 115401052 A CN115401052 A CN 115401052A CN 202210817773 A CN202210817773 A CN 202210817773A CN 115401052 A CN115401052 A CN 115401052A
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- 239000003245 coal Substances 0.000 title claims abstract description 139
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 239000010815 organic waste Substances 0.000 title claims abstract description 77
- 238000002309 gasification Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000004064 recycling Methods 0.000 title claims abstract description 28
- 239000002002 slurry Substances 0.000 title claims abstract description 18
- 239000003250 coal slurry Substances 0.000 claims abstract description 65
- 150000003839 salts Chemical class 0.000 claims abstract description 46
- 239000000243 solution Substances 0.000 claims abstract description 21
- 239000010865 sewage Substances 0.000 claims abstract description 20
- 239000002699 waste material Substances 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000002351 wastewater Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000012266 salt solution Substances 0.000 claims abstract description 12
- 239000010812 mixed waste Substances 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 238000003801 milling Methods 0.000 claims abstract description 5
- 230000001502 supplementing effect Effects 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims description 35
- 239000007789 gas Substances 0.000 claims description 19
- 238000002485 combustion reaction Methods 0.000 claims description 18
- 239000012855 volatile organic compound Substances 0.000 claims description 15
- 239000000654 additive Substances 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 239000003381 stabilizer Substances 0.000 claims description 5
- 238000003786 synthesis reaction Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 239000002912 waste gas Substances 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000001257 hydrogen Substances 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000005336 cracking Methods 0.000 description 5
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- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000012495 reaction gas Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000009264 composting Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 230000004151 fermentation Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/02—Fixed-bed gasification of lump fuel
- C10J3/20—Apparatus; Plants
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Liquid Carbonaceous Fuels (AREA)
Abstract
The invention discloses a method for recycling organic waste by using a coal water slurry gasification furnace, which comprises the following steps 1 to 8. And (3) inputting the organic single waste salt and the organic mixed waste salt into a sewage tank for mixing in the steps 1 to 2, and then mixing the organic process wastewater with the waste salt solution. And 5: the electromagnetic flowmeter and the regulating valve set arranged at the front end of the coal mill control the water supplementing quantity entering the coal mill from the coal milling water tank, and the step 6 is as follows: in the coal mill, the solution and the raw material coal are mixed in proportion to form coal slurry, the coal slurry is fed into a coal slurry tank by a low-pressure coal slurry pump and finally fed into a gasification furnace for treatment, and the raw materials of carbon monoxide and hydrogen for production are used in the subsequent working sections. Not only solves the problem of treatment of waste salt and waste water, reduces environmental pollution, but also saves energy and reduces production cost.
Description
Technical Field
The invention relates to a hazardous waste treatment technology, in particular to a method for recycling organic waste by using a coal water slurry gasification furnace.
Background
Organic wastes generally exist in a plurality of production fields such as pharmaceutical chemicals, fine chemicals, machining and the like, and with the development of economy, a large amount of various organic wastes are discharged every year. These organic wastes usually contain high content of nitrogen and phosphorus elements and have the characteristics of complex components, poor biodegradability and the like, and if the organic wastes are not treated properly, a series of environmental problems and social problems such as soil, water bodies, atmosphere and the like can be caused. The current recycling technology for organic waste mainly comprises: landfill treatment, incineration treatment, aerobic composting, anaerobic composting, microbial fermentation decomposition, briquetting combustion and the like, and the most direct treatment mode is gasification incineration. The prior art is as patent No. CN201410585590.9, which discloses technical details of a coal water slurry gasification process. Patent No. CN201210226764.3 discloses specific details of a coal-water slurry gasifier.
In view of this, the invention provides the technical scheme that the organic waste is converted into the synthesis raw material gas (CO + H2) by using the gasification technology, so that the organic waste is converted into useful resources and products, the organic waste is recycled, and waste is changed into valuable.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for recycling organic wastes by using a water-coal-slurry gasification furnace, which can recycle the wastes such as process wastewater, organic waste salt and the like generated by an organic device, thereby achieving the purposes of saving cost and reducing pollution.
The technical scheme of the invention is realized as follows:
a method for recycling organic waste by using a coal water slurry gasification furnace is characterized by comprising the following steps:
step 1: organic single waste salt is separated out from the filter, the organic waste salt enters a first dissolving tank, raw water is added into the first dissolving tank according to a certain proportion, and the organic waste salt is sent into a sewage tank by a first self-priming pump after being fully dissolved;
step 2: separating organic waste salt from the organic mixed waste salt in a coarse filter, allowing the organic waste salt to enter a second dissolving tank, opening a raw water valve to introduce raw water into the second dissolving tank, introducing the organic waste salt into a sewage tank through a second self-priming pump after the organic waste salt is fully dissolved, and mixing the organic waste salt with the organic waste salt solution obtained in the step 1;
and step 3: when the liquid level of the solution in the sewage tank reaches a set value, the solution in the sewage tank is conveyed into a coal grinding water tank through the cooperation of a third self-sucking pump and a conveying pipeline;
and 4, step 4: the solution in the coal grinding water tank is sent into a coal feeding pipe of a coal grinding machine of a gasification device through the cooperation of a coal grinding water pump and a conveying pipeline thereof, wherein waste gas generated in the coal grinding water tank is conveyed to a VOC (volatile organic compound) processing unit of the gasification device through a breather valve and a pipeline thereof;
and 5: the electromagnetic flow meter and the regulating valve set are arranged at the front end of the coal mill and used for controlling the water supplementing quantity entering the coal mill from the coal milling water tank;
step 6: in a coal mill, mixing an organic waste salt solution and raw coal in proportion to form coal slurry, and feeding the coal slurry into a coal slurry tank by using a low-pressure coal slurry pump;
and 7: opening an additive inlet valve of the coal slurry tank, adding the additive, and forming coal slurry meeting the combustion requirement of the gasification furnace under the action of a coal slurry tank stirrer and the additive;
and 8: and (4) sending the mixture into a gasification furnace through a high-pressure coal slurry pump, and combusting to generate synthesis gas for a subsequent device to use.
In the method for recycling the organic waste by using the coal water slurry gasification furnace, before the step 4, the organic process wastewater is conveyed into a coal grinding water tank through a conveying pipeline, and after the organic process wastewater and the organic waste salt are fully mixed, the step 4 is carried out.
In the method for recycling the organic waste by using the water-coal-slurry gasification furnace, a control valve is arranged between the high-pressure coal-slurry pump and the gasification furnace, and the feeding amount in the furnace is adjusted by the control valve.
In the method for recovering organic waste by using the coal water slurry gasification furnace, the coal grinding machine is also provided with a gasification coal bin and a weighing coal feeder at the coal feeding pipe, and raw material coal is supplied into the coal grinding machine through the gasification coal bin and the weighing coal feeder.
In the method for recycling organic wastes by using the water-coal-slurry gasification furnace, the ratio of the feeding amount of the organic waste salt solution to the feeding amount of the raw material coal in the step 6 is 7: 20, wherein the feeding amount of the solution is controlled by the regulating valve group, and the feeding amount of the raw material coal is controlled by the weighing coal feeder, so that the uniform flow of the solution is ensured, and the water-coal-slurry required by the combustion of the gasification furnace is finally met.
In the method for recycling organic waste by using the coal water slurry gasification furnace, the additives in the step 7 are a dispersing agent and a stabilizing agent, wherein the dispersing agent mainly has the functions of changing the hydrophilicity of the coal surface, reducing the interfacial tension of coal water and fully wetting and uniformly dispersing coal particles in a small amount of water, and the stabilizing agent mainly has the function of stably suspending coal particles in water without generating hard precipitation.
In the method for recycling the organic waste by using the water-coal-slurry gasification furnace, the top of the coal grinding water tank is provided with a VOC gas outlet pipeline, a breather valve is arranged on the pipeline, and gas at the outlet of the breather valve is led to a VOC treatment unit in the device, so that the problem of equipment overpressure possibly caused by evaporation in the coal grinding water tank can be solved, and meanwhile, the problems of environmental pollution and peculiar smell caused by the VOC gas can be solved.
In the method for recycling organic waste by using the water-coal-slurry gasification furnace, the self-priming pumps are all provided with self-priming buffer tanks in a matching way, and before the self-priming pumps are started, the self-priming buffer tanks are filled with water, so that the pump is prevented from being damaged by the vacuum operation of the self-priming pumps due to the insufficient self-priming capability.
In the method for recycling the organic waste by using the coal water slurry gasification furnace, the organic process wastewater and the organic waste salt solution are used as the water supplement of the coal mill and are finally sent to the gasification furnace to be burned to generate the synthesis gas, so that the raw water consumption of the coal mill is reduced, the effective utilization of the waste is realized, and the resource utilization of the waste is realized.
In the method for recycling organic wastes by using the water-coal-slurry gasification furnace, the stirrer is arranged in the coal grinding water tank, and the stirrer in the coal grinding water tank is driven to rotate by the motor, so that the aim is to promote the friction and collision among material particles by the stirring blades of the stirrer, fully mix various sewage entering the coal grinding water tank, effectively prevent the mixed liquid from precipitating at the bottom of the tank, and ensure that the mixed liquid can be uniformly conveyed to the next process.
In the method for recycling organic waste by using the water-coal-slurry gasification furnace, the step 8 is specifically that the reaction process of the water-coal-slurry entering the gasification furnace in the gasification furnace can be divided into three reaction sections: a pyrolysis zone, a combustion zone and a gasification zone.
In the method for recovering organic waste by using the coal water slurry gasification furnace, the cracking zone mainly carries out evaporation of water in the coal water slurry, removal of volatile matters and thermal cracking.
In the method for recovering organic waste by using the water-coal-slurry gasification furnace, the combustion zone mainly carries out combustion reaction, combustible gas generated in the cracking zone and a small amount of reaction gas sucked from the backflow zone are generated in the combustion reaction.
In the method for recovering organic waste by using the water-coal-slurry gasification furnace, the reaction of the coal coke and the water vapor, the coal coke and the CO mainly occur in the gasification area 2 And the like.
The method for recycling the organic waste by using the water-coal-slurry gasification furnace has the following beneficial effects that: the method aims at mixing organic single waste salt and organic mixed waste salt which are input into a sewage pool, new waste cannot be generated due to the mixing, organic process wastewater and a waste salt solution are mixed and then sent into a coal mill to be used as added water, and finally sent into a gasification furnace to be treated, and industrial raw materials of carbon monoxide and hydrogen are produced and used in the subsequent working section, so that the treatment of the waste salt and the wastewater is solved, the environmental pollution is reduced, the energy is saved, and the production cost is reduced.
Drawings
FIG. 1 is a process flow diagram of the method for recycling organic waste using a coal water slurry gasifier according to the present invention;
the reference numbers are given as: 1-a filter, 2-a first dissolving tank, 3-a first self-sucking pump, 4-a sewage tank, 5-a coarse filter, 6-a second dissolving tank, 7-a second self-sucking pump, 8-a third self-sucking pump, 9-a coal grinding water tank, 10-a breather valve, 11-a coal grinding water pump, 12-an electromagnetic flow meter, 13-a regulating valve group, 14-a weighing coal feeder, 15-a gasified coal bunker, 16-a coal grinder, 17-a low-pressure coal slurry pump, 18-a coal slurry tank stirrer, 19-a coal slurry tank, 20-a high-pressure coal slurry pump and 21-a gasification furnace.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in figure 1, the method for recycling organic wastes by using the water-coal-slurry gasification furnace comprises an organic single waste salt device and an organic mixed waste salt device. The organic single waste salt device is used for separating out organic waste salt in the process waste, and the organic mixed waste salt device is used for separating the organic waste salt in the process waste by force. Wherein, the single useless salt device of organic mainly comprises filter 1, first dissolving tank 2 and first self priming pump 3, and the useless salt device of organic mixture mainly comprises coarse filter 5, second dissolving tank 6 and second self priming pump 7. The filter 1 is connected with a first dissolving tank 2, and the first dissolving tank 2 is communicated with a sewage tank 4 through a first self-priming pump 3. The coarse filter 5 is connected with a second dissolving tank 6, and the second dissolving tank 6 is communicated with the sewage tank 4 through a second self-priming pump 7.
In this embodiment, the wastewater tank 4 is connected with a pulverized coal water tank 9 through a third self-priming pump 8. The self priming pump is all supporting to be set up from inhaling the buffer tank, opens at the self priming pump before, will inhale the buffer tank full water from inhaling, prevents that the self priming pump from leading to pump vacuum operation harm machine pump because of inhaling the ability not enough from. The top of the coal grinding water tank 9 is provided with a VOC gas outlet pipeline, and a breather valve 10 is arranged on the pipeline. The outlet gas of the breather valve 10 is led to a VOC treatment unit in the device, so that the problem of equipment overpressure possibly caused by evaporation in the coal grinding water tank can be solved, and meanwhile, the problems of environmental pollution and peculiar smell caused by the VOC gas can be solved. The inside agitating unit that is equipped with of coal grinding basin 9 rotates through agitating unit in the motor drive coal grinding basin 9, and its aim at, stirring vane through agitating unit promotes the friction collision between the material granule, makes the intensive mixing that gets into all kinds of sewage in the coal grinding basin, and the effectual deposit that prevents to mix the liquid at the tank bottom ensures that mixed liquid can carry next process uniformly.
In this embodiment, a coal mill water pump 11 is connected to the coal mill water tank 9, and the solution in the coal mill water tank 9 is fed to a coal mill 16 through the coal mill water pump 11. The coal grinding water pump 11 is also connected with an electromagnetic flowmeter 12 and an adjusting valve group 13. The amount of the solution entering a coal mill 16 from a coal milling water tank 9 is controlled by an adjusting valve group 13, and the ratio of the solution feeding amount to the raw coal feeding amount can be controlled by the cooperation of an electromagnetic flow meter 12 and the adjusting valve group 13. The electromagnetic flowmeter 12 can ensure the solution flow to be uniform, and finally meet the coal water slurry required by the combustion of the gasifier.
In this embodiment, a coal pipe under the coal mill 16 is connected to a weighing coal feeder 14 and a gasified coal bunker 15, and raw coal is supplied into the coal mill through the gasified coal bunker 15 and the weighing coal feeder 14. The outlet of the coal mill 16 is connected with a low-pressure coal slurry pump 17, and the low-pressure coal slurry pump 17 is connected with a coal slurry groove 19. The coal slurry tank 19 is internally connected with a coal slurry tank stirrer 18 for enabling the coal slurry to meet the combustion requirement of the gasification furnace. The coal slurry tank 19 is also connected with a high-pressure coal slurry pump 20, and the high-pressure coal slurry pump 20 is connected with a gasification furnace 21. Wherein, a control valve is arranged between the high-pressure coal slurry pump 20 and the gasification furnace 21, and the control valve is adjusted according to the working condition in the furnace to control the feeding amount in the furnace.
As shown in fig. 1, the method for recycling organic waste by using a water-coal-slurry gasification furnace of the present invention comprises the following steps:
step 1: organic single waste salt is separated out in the filter 1, the organic waste salt enters the first dissolving tank 2, raw water is added into the first dissolving tank 2 in proportion, and the organic waste salt is sent into the sewage tank 4 by the first self-priming pump 3 after being fully dissolved;
step 2: separating organic waste salt from the organic mixed waste salt in a coarse filter 5, enabling the organic waste salt to enter a second dissolving tank 6, opening a raw water valve to introduce raw water into the second dissolving tank 6, introducing the organic waste salt into a sewage tank 4 through a second self-sucking pump 7 after the organic waste salt is fully dissolved, and mixing the organic waste salt with the organic waste salt solution obtained in the step 1, wherein no new waste is generated due to the mixing;
and step 3: conveying the organic process wastewater into a coal grinding water tank 9 through a pipeline, and when the organic process wastewater is fully mixed with organic waste salt, no new waste is generated by the mixing;
and 4, step 4: when the liquid level of the solution in the sewage tank 4 reaches a set value (namely the solution fills the sewage tank by 80%), the solution in the sewage tank 4 is conveyed into a coal grinding water tank 9 through the cooperation of a third self-priming pump 8 and a conveying pipeline;
and 5: the solution in the coal grinding water tank 9 is sent into a coal feeding pipe of a coal grinding machine 16 of a gasification device through the matching of a coal grinding water pump 11 and a conveying pipeline thereof, wherein a VOC gas outlet pipeline is arranged at the top of the coal grinding water tank 9, a breather valve 10 is arranged on the pipeline, and the gas at the outlet of the breather valve 10 is introduced to a VOC processing unit in the device, so that the problem of equipment overpressure possibly caused by evaporation in the coal grinding water tank 9 can be solved, and meanwhile, the problems of environmental pollution and peculiar smell caused by the VOC gas can be solved;
and 6: an electromagnetic flowmeter 12 and a regulating valve group 13 are arranged at the front end of the coal mill 16, the quantity of water supplied into the coal mill 16 from the coal milling water tank 9 is controlled, a gasification coal bin 15 and a weighing coal feeder 14 are further arranged at a coal pipe of the coal mill 16, and raw coal is supplied into the coal mill 16 through the gasification coal bin 15 and the weighing coal feeder 14.
And 7: in a coal mill 16, an organic waste salt solution and raw material coal are mixed in proportion to form coal slurry, the coal slurry is fed into a coal slurry tank 19 by using a low-pressure coal slurry pump 17, wherein the ratio of the feeding amount of the organic waste salt solution to the feeding amount of the raw material coal is 7: 20, the feeding amount of the solution is controlled by an adjusting valve group 13, and the feeding amount of the raw material coal is controlled by a weighing coal feeder 14, so that the uniform flow of the solution is ensured, and the coal slurry required by combustion of a gasification furnace is finally met;
and step 8: opening an additive inlet valve of a coal slurry tank 19, adding an additive, and forming coal slurry meeting the combustion requirement of a gasification furnace under the action of a coal slurry tank stirrer 18 and the additive, wherein the additive comprises a dispersing agent and a stabilizing agent, the dispersing agent mainly has the functions of changing the hydrophilicity of the coal surface and reducing the interfacial tension of coal water so that coal particles are fully wetted and uniformly dispersed in a small amount of water, and the stabilizing agent mainly has the functions of stably suspending the coal particles in the water and avoiding hard precipitation;
and step 9: is sent into a gasification furnace 21 through a high-pressure coal slurry pump 20 and is combusted to generate synthesis gas (CO + H) 2 ) For use by subsequent devices.
In this embodiment, the reaction process of the coal water slurry entering the gasification furnace 21 in the gasification furnace 21 can be divided into three reaction sections: a pyrolysis zone, a combustion zone, and a gasification zone. The water in the coal water slurry is evaporated, the volatile components are removed and the coal is thermally cracked in a cracking area, the heat required in the process is mainly from the heat radiated by the high-temperature environment in the furnace, the high-temperature reaction gas which flows back is heated, and the coal becomes coal coke after the volatile components are removed.
The combustion reaction is mainly carried out in the combustion zone, firstly the combustible gas produced in the cracking zone and a small amount of reaction gas entrained from the reflux zone are subjected to the combustion reaction, and then the combustion reaction of the coal coke is carried out, wherein the main product of the combustion reaction is CO 2 . The reaction of the char and steam mainly takes place in the gasification zone, char and CO 2 Reduction reaction of (2), and the like.
A small amount of methane may be produced during the coal cracking process, and is completely combusted in a high-temperature and oxygen-rich environment through the gasification furnace. The methane in the raw gas mainly comes from methanation reaction at the later stage of gasification reaction: such as CO +3H 2 =CH 4 +H 2 0 and C +2H 2 =CH 4 The reaction of (1). In the later stage of gasification reaction, the gasification furnace is rich in CO and H 2 And unreacted residual carbon, can be recycled.
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 and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for recycling organic waste by using a coal water slurry gasification furnace is characterized by comprising the following steps:
step 1: organic single waste salt is separated out from the organic waste salt in the filter, the organic waste salt enters a first dissolving tank, raw water is added into the first dissolving tank according to a certain proportion, and the organic waste salt is sent into a sewage tank by a first self-priming pump after being fully dissolved;
step 2: separating organic waste salt from the organic mixed waste salt in a coarse filter, allowing the organic waste salt to enter a second dissolving tank, opening a raw water valve to introduce raw water into the second dissolving tank, introducing the organic waste salt into a sewage tank through a second self-priming pump after the organic waste salt is fully dissolved, and mixing the organic waste salt with the organic waste salt solution obtained in the step 1;
and step 3: when the liquid level of the solution in the sewage tank reaches a set value, the solution in the sewage tank is conveyed into a coal grinding water tank through the cooperation of a third self-sucking pump and a conveying pipeline;
and 4, step 4: the solution in the coal grinding water tank is sent into a coal feeding pipe of a coal grinding machine of a gasification device through the cooperation of a coal grinding water pump and a conveying pipeline thereof, wherein waste gas generated in the coal grinding water tank is conveyed to a VOC (volatile organic compound) processing unit of the gasification device through a breather valve and a pipeline thereof;
and 5: the electromagnetic flow meter and the regulating valve set are arranged at the front end of the coal mill and used for controlling the water supplementing quantity entering the coal mill from the coal milling water tank;
step 6: in a coal mill, mixing an organic waste salt solution and raw material coal in proportion to form coal slurry, and feeding the coal slurry into a coal slurry tank by using a low-pressure coal slurry pump;
and 7: opening an additive inlet valve of the coal slurry tank, adding the additive, and forming coal slurry meeting the combustion requirement of the gasification furnace under the action of a coal slurry tank stirrer and the additive;
and 8: and (4) sending the mixture into a gasification furnace through a high-pressure coal slurry pump, and combusting to generate synthesis gas for a subsequent device to use.
2. The method for recycling organic wastes through a water-coal-slurry gasification furnace according to claim 1, wherein before the step 4, the organic process wastewater is conveyed into a coal grinding water tank through a conveying pipeline, and after the organic process wastewater is fully mixed with the organic waste salt, the step 4 is performed.
3. The method for recycling organic wastes using a water-coal-slurry gasification furnace according to claim 1, wherein a control valve is further provided between the high-pressure coal-slurry pump and the gasification furnace, and the feeding amount in the furnace is adjusted by the control valve.
4. The method for recycling organic waste materials using a water-coal-slurry gasification furnace according to claim 1, wherein the coal pulverizer lower pipe is further provided with a gasification coal bunker and a weighing coal feeder, and raw coal is supplied into the coal pulverizer through the gasification coal bunker and the weighing coal feeder.
5. The method for recycling organic wastes through a water-coal-slurry gasification furnace according to claim 4, wherein the ratio of the feeding amount of the organic waste salt solution to the feeding amount of the raw material coal in the step 6 is 7: 20, wherein the feeding amount of the solution is controlled by a regulating valve group, and the feeding amount of the raw material coal is controlled by a weighing coal feeder.
6. The method for recycling organic wastes using a water-coal-slurry gasification furnace according to claim 1, wherein the additives in the step 7 are a dispersant and a stabilizer.
7. The method for recycling organic wastes according to claim 1, wherein a VOC gas outlet line is provided at the top of the coal-grinding water tank, and a breather valve is provided on the line, and the outlet gas of the breather valve is led to a VOC treatment unit in the device.
8. The method for recycling organic waste by using a water-coal-slurry gasification furnace according to claim 1, wherein self-priming pumps are respectively provided with a self-priming buffer tank, and the self-priming buffer tanks are filled with water before the self-priming pumps are started.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210817773.3A CN115401052A (en) | 2022-07-13 | 2022-07-13 | Method for recycling organic waste by using coal water slurry gasification furnace |
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