CN114410349A - Waste pretreatment process matched with coal water slurry gasification - Google Patents
Waste pretreatment process matched with coal water slurry gasification Download PDFInfo
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- CN114410349A CN114410349A CN202111681681.9A CN202111681681A CN114410349A CN 114410349 A CN114410349 A CN 114410349A CN 202111681681 A CN202111681681 A CN 202111681681A CN 114410349 A CN114410349 A CN 114410349A
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- 239000002699 waste material Substances 0.000 title claims abstract description 122
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- 238000002309 gasification Methods 0.000 title claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 65
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- 238000000034 method Methods 0.000 title claims abstract description 57
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- 239000010802 sludge Substances 0.000 claims abstract description 55
- 238000003860 storage Methods 0.000 claims abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000010815 organic waste Substances 0.000 claims abstract description 29
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- 239000007789 gas Substances 0.000 claims description 12
- 239000002283 diesel fuel Substances 0.000 claims description 10
- 239000003250 coal slurry Substances 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
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- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000002912 waste gas Substances 0.000 claims description 4
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- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims description 2
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 7
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229960000074 biopharmaceutical Drugs 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
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- 230000007613 environmental effect Effects 0.000 description 2
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- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 244000052769 pathogen Species 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- -1 Methanol Dioctyl adipate Ethanol Chemical compound 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 229920001893 acrylonitrile styrene Polymers 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013601 eggs Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
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- 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
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
-
- 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
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a waste treatment process matched with coal water slurry gasification, which comprises a pretreatment process, wherein waste liquid and waste water from a tank car are pumped into a high COD waste water receiving tank, and are sent into a high COD buffer tank for mixing if the waste liquid and the waste water can be mixed after being analyzed, and are sent into a high COD waste water storage tank for standby after being mixed in the buffer tank; if the materials cannot be mixed, directly feeding the materials into a preparation kettle, adding an alkali solution, and stirring for pretreatment; solid content<Directly feeding 20% of waste liquid into a preparation kettle for pretreatment; the preparation kettle is heated by a coil pipe and is adjusted to pH value by alkali>8; after the solid and the waste liquid are mixed into uniform suspension liquid, the suspension liquid is sent to a configuration groove; the invention can simultaneously treat various wastes such as wastewater, organic waste liquid, waste oil, waste residue, waste activated carbon, sludge and the like, and realizes the comprehensive utilization of different kinds of wastes with different solid contents by the waste pretreatment technology; realizes the harmless treatment of wastes by the gasification of the coal water slurry and produces synthesis gas (CO + H)2) Has obvious economic benefitAnd social benefits.
Description
Technical Field
The invention relates to a waste treatment process matched with coal water slurry gasification.
Background
Municipal sewage sludge is one of the main by-products of municipal sewage treatment plants. With the improvement of the environmental protection level, the treatment amount of municipal sewage is increased year by year, and the annual output of municipal sludge, which is a byproduct of the municipal sewage treatment, is also sharply increased, so that the sludge treatment and disposal is an inevitable problem accompanying the sewage treatment. The sludge contains a large amount of organic matters and nutrient elements, and heavy metals, pathogenic bacteria, viruses and toxic organic matters which are contained in the sludge cause the sludge to be harmful to the environment in the processes of generation, storage, treatment and disposal and resource utilization, particularly along with the rapid development of urbanization and industrialization of various countries in the world, the prohibition of marine treatment of the sludge, the establishment and implementation of strict landfill standards and increasingly strict agricultural standards, and the management of the sludge becomes a worldwide social and environmental problem at present. At present, the methods of sludge treatment and disposal include landfill, incineration, land utilization and the like, but the methods have advantages and disadvantages and are not uniformly suggested. Moreover, the sludge components and economic conditions in various regions are different, and the sludge recycling technology should be adapted according to local conditions.
The coal water slurry has obvious advantages in the aspects of preparation, combustion, storage and transportation, pollution control and the like as the currently more suitable clean energy, and sewage, waste water, organic waste liquid, waste residues, waste activated carbon and sludge are directly mixed with coal powder for pulping, so that not only can the waste be incinerated, but also the heat energy in the waste can be utilized, and part of coal and water can be replaced.
Patent CN102690040B discloses a method for treating municipal sludge, comprising: before the urban sludge is dehydrated, the pH value of the sludge is adjusted to 2-4, a catalyst, hydrogen peroxide and persulfate are added, and the reaction is carried out for more than or equal to 5min at the temperature of 10-100 ℃. The method for treating the municipal sludge has the advantages that the volume of the sludge cake of the dewatered sludge, the water content of the sludge cake of the dewatered sludge, the dry solid content of the sludge and the organic matter content of the sludge are greatly reduced, the sludge is only pretreated, the solid content of the sludge is improved, and the subsequent treatment of the sludge needs to be carried out by landfill or incineration.
Patent CN104003593B discloses a harmless treatment method of sludge, which removes heavy metals in the sludge by an adsorption technology and removes ova, pathogens, carcinogens, macromolecular organic pesticides which are difficult to decompose and the like in the sludge by a steam explosion decomposition technology; the innocent treatment of the sludge is skillfully and efficiently completed. The method has the advantages of short process, thorough treatment and high content of micromolecule substances, thereby being beneficial to the development and utilization of the finally obtained clean mud powder, and the obtained mud powder can be used for manufacturing cement, bricks and tiles, fertilizers and the like. However, in this method, the sludge is vapor-phase-cooked at 260 ℃ and 1.8MPa, and then flash-evaporated, which may have effects on eggs and pathogens, but cannot degrade organic materials.
Patent CN102583905B discloses a sewage treatment method, comprising: pretreatment: removing suspended matters in the treated sewage; main processing: sending the pretreated sewage into a main treatment system comprising an anaerobic zone, an anoxic zone, an aerobic zone and a precipitation zone which are communicated in sequence for treatment; suspended fillers are added into an anaerobic zone, an anoxic zone and an aerobic zone of the main treatment system respectively, organic matters, ammonia nitrogen and phosphorus in sewage are removed through activated sludge suspended in the anaerobic zone, the anoxic zone and the aerobic zone and a biological membrane attached to the suspended fillers, and mixed liquor discharged from the aerobic zone is subjected to sludge-water separation through a settling zone; and (3) post-treatment: and (4) directly discharging or recycling the sewage after the main treatment after the disinfection treatment. The method has large occupied area for sewage treatment and can not treat the organic sewage with high COD.
Patent application CN103431242A discloses a method for preparing coal water slurry by using methylamine wastewater, wherein the PH value of the methylamine wastewater is adjusted to 9.0-10.0, and deodorization treatment is carried out; activating the coal water slurry additive; and adding the coal water slurry additive and the coal powder into the methylamine wastewater subjected to the deodorization treatment, and uniformly mixing to obtain the coal water slurry. However, this method does not describe a process of wastewater pretreatment and is only a kind of wastewater pulping.
Patent application CN108841423A discloses a method for preparing coal water slurry by using various coal conversion wastewater. The method for preparing the coal water slurry by utilizing the wastewater converted from various coals comprises the following steps: mixing and stirring the gas washing water, the desulfurization barren solution, the sulfur water and the carbonization wastewater generated in the coal conversion process; adding composite alkali serving as a conditioner into the mixed wastewater, wherein the addition amount of the composite alkali is 0.4-1.0 wt% of the total mass of the wastewater; and finally, adding the treated wastewater, coal and an additive into a rod mill to prepare the wastewater coal water slurry. The method only introduces the pretreatment process of the wastewater, the wastewater is generated in the coal gasification process, and the pretreatment process of sludge and waste solids is not introduced.
Patent application CN108264936A discloses a harmless treatment and utilization method of bio-pharmaceutical wastewater, comprising the following steps: preparing the biological pharmaceutical wastewater to be treated into pretreatment liquid; mixing the pretreatment solution, an auxiliary agent and a carbon source substance to prepare coal water slurry; carrying out gasification reaction on the coal water slurry in an oxygen-containing atmosphere at 1000-1700 ℃ and 0.5-5 MPa to obtain a gaseous product and liquid slag; chilling and separating the gaseous product and the liquid slag to obtain mixed gas and glassy slag. The method only introduces the pretreatment process of the wastewater, the wastewater is the biopharmaceutical wastewater, and the pretreatment process of sludge and waste solids is not introduced.
The patent application CN101935055A utilizes the coal water slurry technology to burn high-concentration wastewater and co-produce synthetic ammonia method, the high-concentration wastewater is firstly pretreated to prepare coal water slurry; preparing coal water slurry with the concentration of 50-65% and pure oxygen from air separationSpraying the gas into a gasification furnace, and carrying out gasification and cracking reaction at 1350-1450 ℃ and 1.1-1.3 MPa to generate CO and CO2、H2、N2And water gas of trace hydrogen sulfide; the CO reacts with water vapor to generate CO through a conversion process2And H2(ii) a Removing trace hydrogen sulfide by wet desulphurization in a desulphurization process; a part of the gas enters a carbonization procedure to remove CO2Simultaneously, ammonium bicarbonate is generated. And the other part of the gas enters a PSA hydrogen extraction process to prepare high-purity hydrogen. The prepared high-purity hydrogen is used for preparing potassium borohydride, one part of the prepared high-purity hydrogen is mixed with high-purity nitrogen delivered by air separation, and the mixture is subjected to a synthesis procedure to produce synthetic ammonia to prepare finished product liquid ammonia. Wastewater pretreatment: adjusting the pH of the waste water containing high-concentration COD to be more than 7 by using waste sulfuric acid or waste alkali generated in the production process of potassium borohydride, and measuring the COD concentration; the waste heat steam generated in the production process of synthetic ammonia is used for film concentration, the COD concentration of the waste water reaches more than 15 ten thousand units, the waste water is used for preparing water-coal-slurry, and the distilled water is used for a gasification chilling chamber and is recycled. The pretreatment technology needs to consume steam, and the energy consumption is high.
The existing waste water or waste liquid treatment technology can only treat waste water or waste liquid singly, but cannot treat waste liquid, waste solids, waste oil and the like simultaneously.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a waste treatment process matched with coal water slurry gasification, which can simultaneously treat waste water, organic waste liquid, waste oil, waste residues, waste activated carbon, sludge and the like, and can treat waste and obtain byproducts CO and H through coal water slurry gasification2And social and economic benefits are improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a waste treatment process matched with coal water slurry gasification comprises a pretreatment process, wherein the pretreatment process comprises the following steps:
the waste liquid and waste water from the tank wagon are pumped into a high COD waste water receiving tank, are analyzed by an assay, and are mixed in a high COD buffer tank if the waste liquid and the waste water can be mixed after the analysis, and are mixed in the buffer tankAfter the synthesis, sending the mixture into a high COD wastewater storage tank for standby; if the materials cannot be mixed, directly feeding the materials into a preparation kettle, adding an alkali solution, and stirring for pretreatment; solid content<Directly feeding 20% of waste liquid into a preparation kettle for pretreatment; after sampling different waste water in a laboratory, (1) analyzing whether the different waste water is precipitated and crystallized after being mixed. If precipitation or crystallization occurs, mixing cannot be performed. (2) Analysis of Cl in different wastewaters-Content, Cl-When the concentration exceeds 10000ppm, the components cannot be directly mixed, and low Cl is added according to the proportion of different waste water-Mixing the wastewater with concentration to enable the mixed wastewater to be Cl-The concentration is not more than 10000 ppm.
Heating a preparation kettle by adopting a coil, arranging a reflux condenser, and adjusting the pH value to be more than 8 by using alkali; after the solid and the waste liquid are mixed into uniform suspension liquid, the suspension liquid is sent to a configuration tank in an alkaline suspension liquid state;
feeding the waste water and waste liquid in the configuration groove into a coal mill, grinding the waste water and waste liquid together with coal into coal water slurry, and feeding the coal water slurry into a gasification furnace for gasification;
feeding the sludge with the solid content of less than 60 wt% into a storage bin, feeding the sludge into a coal mill by a screw conveyor after feeding the sludge into the storage bin, grinding the sludge and coal into slurry together, and feeding the slurry into a gasification furnace for gasification;
semi-dry sludge and waste solids with solid content more than 60 wt% are packaged in a ton bag material mode, are sent by an automobile, fall into a storage bin after being crushed by a ton bag breaker arranged at the top of the storage bin, are provided with a screw conveyor at the lower part of the storage bin, are sent into a coal mill by the screw conveyor, are ground into slurry together with coal, and are sent into a gasification furnace for gasification;
organic waste liquid and waste oil from a tank car are pumped into an organic waste liquid and waste oil storage tank, the organic waste liquid and the waste oil in the storage tank are pumped into a channel of a multi-channel burner through a raw material conveying pump, and are atomized and sheared by the burner and then are sent into a gasification furnace to react to produce CO and H2；
In the process, the waste gas generated by waste treatment is sent to a waste gas treatment system for treatment.
Specifically, the alcohol-containing wastewater from the chemical industry park comprises 200t/d, 50t/d of oil sludge, 20t/d of waste activated carbon, 250t/d of high-concentration organic waste liquid and 30t/d of waste diesel oil, and is sent into a coal water slurry gasification furnace for treatment through a waste pretreatment process, the feeding amount of the gasification furnace is 1500t/d, the pressure of the gasification furnace is 6.5MPaG, and the gasification temperature is 1300 ℃;
sending alcohol-containing wastewater into a high COD wastewater receiving tank through a high COD wastewater discharge pump, then sequentially sending the alcohol-containing wastewater into a wastewater buffer tank and a wastewater storage tank, finally sending the alcohol-containing wastewater into a configuration tank, adding alkali to adjust the pH to be more than 8, sending the alcohol-containing wastewater in the configuration tank into a coal mill, grinding the alcohol-containing wastewater and coal into coal water slurry, and then sending the coal water slurry into a gasification furnace for gasification;
the oil sludge is sent into a storage bin, sent into a coal mill by a screw conveyor after being sent into the storage bin, ground into slurry together with coal and then sent into a gasification furnace for gasification;
the waste activated carbon sent by an automobile falls into a storage bin after being crushed by a ton bag breaker arranged at the top of the storage bin, a screw conveyor is arranged at the lower part of the storage bin, and the waste activated carbon is sent into a coal mill by the screw conveyor, ground into slurry together with coal and then sent into a gasification furnace for gasification;
sending the high-concentration organic waste liquid into an organic waste liquid tank, and sending the organic waste liquid into an outermost side channel of the multi-channel burner through a high-pressure delivery pump for gasification;
feeding the waste diesel into a waste diesel storage tank, and feeding the waste diesel into one channel of a multi-channel burner through a high-pressure oil pump for gasification;
alcohol-containing wastewater, oil sludge, waste activated carbon and coal after waste pretreatment are ground together to prepare coal slurry, and insufficient water is supplemented by fresh water;
the fed water coal slurry, high-concentration organic waste liquid and waste diesel oil enter a gasification furnace for partial oxidation reaction through atomization of a multi-channel burner to generate a mixture containing CO and H2The synthesis gas of (2).
In the invention, the multi-channel burner adopts 5 channels, is distributed from inside to outside as central oxygen, coal water slurry, external epoxy, waste diesel oil and high-concentration organic waste liquid, and is used for gasifying wastes with different materials and different solid contents and performing harmless treatment on the wastes.
In the above process, the composition of the obtained synthesis gas on a dry basis is as follows:
| composition of | Unit of | Numerical value |
| H2 | mol％ | 32.29 |
| CO | mol％ | 42.76 |
| CO2 | mol％ | 18.31 |
| H2S | mol％ | 1.20 |
| COS | mol％ | 0.02 |
| CH4 | mol％ | 0.02 |
| N2 | mol％ | 0.29 |
| AR | mol％ | 0.10 |
Compared with the prior art, the invention has the advantages that: the invention can simultaneously treat various wastes such as wastewater, organic waste liquid, waste oil, waste residue, waste activated carbon, sludge and the like, and realizes the comprehensive utilization of different kinds of wastes with different solid contents by the waste pretreatment technology; realizes the harmless treatment of wastes by the gasification of the coal water slurry and produces synthesis gas (CO + H)2) Has obvious economic benefit and social benefit.
Drawings
FIG. 1 is a flow diagram of a pretreatment process according to an embodiment of the present invention;
FIG. 2 is a flow chart of a matched coal water slurry gasification process in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 and 2, the waste treatment process for matching with coal water slurry gasification of the embodiment includes the following steps:
the waste from the chemical industry park consists of 200t/d alcohol-containing wastewater, 50t/d oil sludge, 20t/d waste activated carbon, 250t/d high-concentration organic waste liquid and 30t/d waste diesel oil, and is sent into a coal water slurry gasification furnace for treatment through a waste pretreatment technology, the feeding amount of the gasification furnace is 1500t/d, the pressure of the gasification furnace is 6.5MPaG, and the gasification temperature is 1300 ℃.
TABLE 1 composition of alcohol-containing wastewater
| Unit of | Methanol | Dioctyl adipate | Ethanol | Water (W) | |
| Composition of | wt％ | ＜1.0 | ＜0.5 | ＜0.8 | ～97.7 |
TABLE 2 oily sludge composition
| Unit of | Oil | Mud | Water (W) | |
| Composition of | wt％ | ～55 | ～55 | ～40 |
TABLE 3 waste activated carbon composition
| Unit of | Organic matter | Water (W) | Activated carbon | |
| Composition of | wt％ | ～2 | ～2 | ～96 |
TABLE 4 high concentration organic waste liquor composition
| Unit of | Acrylonitrile | Styrene (meth) acrylic acid ester | Ethanol | Water (W) | |
| Composition of | wt％ | ＜1.0 | ＜2.0 | ～6 | ～91 |
TABLE 5 spent Diesel composition
| Unit of | Diesel oil | Residual oil | Water (W) | Heat value | |
| Composition of | wt％ | ～96 | ～3 | ＜1.0 | 45.2MJ/kg |
The alcohol-containing wastewater is sent into a high COD wastewater receiving tank through a high COD wastewater discharge pump and then sent into a wastewater buffer tank and a wastewater storage tank in sequence. Finally, the mixture is sent into a configuration tank and added with alkali to adjust the PH value to be more than 8. The alcohol-containing wastewater in the configuration tank is sent into a coal mill to be milled into coal water slurry together with coal, and then is sent into a gasification furnace to be gasified.
The oil sludge is sent into a storage bin, sent into a coal mill by a screw conveyor after being sent into the storage bin, and then sent into a gasification furnace to be gasified after being ground into slurry together with coal.
The waste activated carbon sent by the automobile falls into the storage bin after being crushed by a ton bag breaker arranged at the top of the storage bin, a screw conveyor is arranged at the lower part of the storage bin, and the waste activated carbon is sent into a coal mill by the screw conveyor, is ground into slurry together with coal, and then is sent into a gasification furnace for gasification.
And sending the high-concentration organic waste liquid into an organic waste liquid tank, and sending the organic waste liquid into an outermost side channel of the multi-channel burner through a high-pressure delivery pump for gasification. And feeding the waste diesel into a waste diesel storage tank, and feeding the waste diesel into one channel of the multi-channel burner through a high-pressure oil pump for gasification.
The multi-channel burner adopts 5 channels, and comprises central oxygen, coal water slurry, outer epoxy, waste diesel oil and high-concentration organic waste liquid from inside to outside. The alcohol-containing wastewater, oil sludge, waste activated carbon and coal after waste pretreatment are ground together to prepare the coal slurry, and the insufficient water is supplemented by fresh water.
The fed water coal slurry, high-concentration organic waste liquid and waste diesel oil enter a gasification furnace for partial oxidation reaction through atomization of a multi-channel burner to generate a mixture containing CO and H2The synthesis gas of (5) has the composition shown in Table 6. Waste gasification and harmless treatment of waste with different materials and different solid contents are realized through the matched multi-channel coal water slurry burner.
TABLE 6 composition of the syngas (dry basis)
| Composition of | Unit of | Numerical value |
| H2 | mol％ | 32.29 |
| CO | mol％ | 42.76 |
| CO2 | mol％ | 18.31 |
| H2S | mol％ | 1.20 |
| COS | mol％ | 0.02 |
| CH4 | mol％ | 0.02 |
| N2 | mol％ | 0.29 |
| AR | mol％ | 0.10 |
。
Claims (6)
1. A waste treatment process matched with coal water slurry gasification is characterized in that: comprising a pre-treatment process comprising the steps of:
pumping waste liquid and waste water from a tank car into a high COD waste water receiving tank, carrying out assay analysis, sending the waste liquid and the waste water into a high COD buffer tank for mixing if the waste liquid and the waste water can be mixed after the analysis, and sending the waste liquid and the waste water into a high COD waste water storage tank for standby after the waste liquid and the waste water are mixed in the buffer tank; if the materials cannot be mixed, directly feeding the materials into a preparation kettle, adding an alkali solution, and stirring for pretreatment; directly feeding the waste liquid with the solid content of less than 20% into a preparation kettle for pretreatment;
heating a preparation kettle by adopting a coil, arranging a reflux condenser, and adjusting the pH value to be more than 8 by using alkali; after the solid and the waste liquid are mixed into uniform suspension liquid, the suspension liquid is sent to a configuration tank in an alkaline suspension liquid state;
feeding the waste water and waste liquid in the configuration groove into a coal mill, grinding the waste water and waste liquid together with coal into coal water slurry, and feeding the coal water slurry into a gasification furnace for gasification;
feeding the sludge with the solid content of less than 60 wt% into a storage bin, feeding the sludge into a coal mill by a screw conveyor after feeding the sludge into the storage bin, grinding the sludge and coal into slurry together, and feeding the slurry into a gasification furnace for gasification;
semi-dry sludge and waste solids with solid content more than 60 wt% are packaged in a ton bag material mode, are sent by an automobile, fall into a storage bin after being crushed by a ton bag breaker arranged at the top of the storage bin, are provided with a screw conveyor at the lower part of the storage bin, are sent into a coal mill by the screw conveyor, are ground into slurry together with coal, and are sent into a gasification furnace for gasification;
organic waste liquid and waste oil from a tank wagon are pumped into organic waste liquid and waste oil storage tanks, the organic waste liquid and the waste oil in the storage tanks are pumped into the outermost side channel of a multi-channel burner through a raw material conveying pump, and are atomized and sheared by the burner and then are sent into a gasification furnace to react to produce CO and H2；
In the process, the waste gas generated by waste treatment is sent to a waste gas treatment system for treatment.
2. The waste treatment process matched with coal water slurry gasification according to claim 1, characterized in that: different wasteAfter sampling in a water laboratory, (1) analyzing whether different waste water is precipitated and crystallized after being mixed, and if the different waste water is precipitated and crystallized, the different waste water cannot be mixed; (2) analysis of Cl in different wastewaters-Content, Cl-When the concentration exceeds 10000ppm, the components cannot be directly mixed, and low Cl is added according to the proportion of different waste water-Mixing the wastewater with concentration to enable the mixed wastewater to be Cl-The concentration is not more than 10000 ppm.
3. The waste treatment process matched with coal water slurry gasification according to claim 1, characterized in that:
the alcohol-containing wastewater from the chemical industry park comprises 200t/d, 50t/d of oil sludge, 20t/d of waste activated carbon, 250t/d of high-concentration organic waste liquid and 30t/d of waste diesel oil, and is sent into a coal water slurry gasification furnace for treatment after a waste pretreatment process, the feeding amount of the gasification furnace is 1500t/d, the pressure of the gasification furnace is 6.5MPaG, and the gasification temperature is 1300 ℃;
sending alcohol-containing wastewater into a high COD wastewater receiving tank through a high COD wastewater discharge pump, then sequentially sending the alcohol-containing wastewater into a wastewater buffer tank and a wastewater storage tank, finally sending the alcohol-containing wastewater into a configuration tank, adding alkali to adjust the pH to be more than 8, sending the alcohol-containing wastewater in the configuration tank into a coal mill, grinding the alcohol-containing wastewater and coal into coal water slurry, and then sending the coal water slurry into a gasification furnace for gasification;
the oil sludge is sent into a storage bin, sent into a coal mill by a screw conveyor after being sent into the storage bin, ground into slurry together with coal and then sent into a gasification furnace for gasification;
the waste activated carbon sent by an automobile falls into a storage bin after being crushed by a ton bag breaker arranged at the top of the storage bin, a screw conveyor is arranged at the lower part of the storage bin, and the waste activated carbon is sent into a coal mill by the screw conveyor, ground into slurry together with coal and then sent into a gasification furnace for gasification;
sending the high-concentration organic waste liquid into an organic waste liquid tank, and sending the organic waste liquid into an outermost side channel of the multi-channel burner through a high-pressure delivery pump for gasification;
feeding the waste diesel into a waste diesel storage tank, and feeding the waste diesel into one channel of a multi-channel burner through a high-pressure oil pump for gasification;
alcohol-containing wastewater, oil sludge, waste activated carbon and coal after waste pretreatment are ground together to prepare coal slurry, and insufficient water is supplemented by fresh water;
the fed water coal slurry, high-concentration organic waste liquid and waste diesel oil enter a gasification furnace for partial oxidation reaction through atomization of a multi-channel burner to generate a mixture containing CO and H2The synthesis gas of (2).
4. The waste treatment process matched with coal water slurry gasification according to claim 3, wherein the waste treatment process comprises the following steps: the multi-channel burner is provided with n channels, wherein n is more than or equal to 4 and less than or equal to 12.
5. The waste treatment process matched with coal water slurry gasification according to claim 4, wherein the waste treatment process comprises the following steps: the multi-channel burner adopts 5 channels, is arranged from inside to outside as central oxygen, coal water slurry, outer epoxy, waste diesel oil and high-concentration organic waste liquid, and is used for gasifying wastes with different materials and different solid contents and performing harmless treatment on the wastes.
6. The waste treatment process matched with coal water slurry gasification according to claim 3, wherein the waste treatment process comprises the following steps: the resulting synthesis gas had a dry basis composition of:
。
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| CN114873880A (en) * | 2022-06-13 | 2022-08-09 | 常州大学 | An oily sludge treatment system and method |
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