CN114634828A - Gasification system for preparing gasified gas by using black liquid coal water slurry and gasification process thereof - Google Patents
Gasification system for preparing gasified gas by using black liquid coal water slurry and gasification process thereof Download PDFInfo
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- CN114634828A CN114634828A CN202210462439.0A CN202210462439A CN114634828A CN 114634828 A CN114634828 A CN 114634828A CN 202210462439 A CN202210462439 A CN 202210462439A CN 114634828 A CN114634828 A CN 114634828A
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- 239000003245 coal Substances 0.000 title claims abstract description 139
- 239000002002 slurry Substances 0.000 title claims abstract description 91
- 238000002309 gasification Methods 0.000 title claims abstract description 89
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000007788 liquid Substances 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 106
- 238000011084 recovery Methods 0.000 claims abstract description 75
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 50
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 50
- 239000000126 substance Substances 0.000 claims abstract description 37
- 239000002893 slag Substances 0.000 claims abstract description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 31
- 239000001301 oxygen Substances 0.000 claims abstract description 31
- 238000000926 separation method Methods 0.000 claims abstract description 27
- 238000002360 preparation method Methods 0.000 claims abstract description 17
- 238000010521 absorption reaction Methods 0.000 claims description 21
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 18
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 18
- 230000005855 radiation Effects 0.000 claims description 15
- 238000009993 causticizing Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 11
- 238000004898 kneading Methods 0.000 claims description 10
- 239000000654 additive Substances 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 9
- 239000000446 fuel Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000003303 reheating Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 239000003818 cinder Substances 0.000 abstract description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000004537 pulping Methods 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000003250 coal slurry Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011552 falling film Substances 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920000417 polynaphthalene Polymers 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 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
-
- 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
- C10J3/72—Other features
-
- 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
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
-
- 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
- C10J3/72—Other features
- C10J3/86—Other features combined with waste-heat boilers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
-
- 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
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
-
- 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
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
-
- 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
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
- C10J2300/1615—Stripping
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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
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
- C10J2300/1643—Conversion of synthesis gas to energy
-
- 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
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1687—Integration of gasification processes with another plant or parts within the plant with steam generation
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Industrial Gases (AREA)
Abstract
The gasification system for preparing gasification gas by using black liquid coal water slurry provided by the invention comprises a black liquid coal water slurry preparation unit, a gasification unit and a gasification unit, wherein the black liquid coal water slurry preparation unit receives coal and dilute black liquid and prepares and stores black liquid coal water slurry; the air separation plant provides oxygen to the gasification unit; the gasification unit gasifies the black liquid coal water slurry to generate crude synthesis gas and coal slag; the sensible heat recovery unit recovers the sensible heat in the raw synthesis gas and the coal slag generated by the gasification unit to generate high-temperature and high-pressure steam; the thermoelectric unit reheats the high-temperature and high-pressure steam generated by the sensible heat recovery unit into superheated steam which is respectively used for the air separation device to produce oxygen and provide electric energy; the chemical recovery unit converts the coal cinder and the crude synthesis gas discharged by the sensible heat recovery unit into gasified gas and white liquid, part of the gasified gas enters the thermoelectric unit to be used as a heat source, and the white liquid, the residual gasified gas, part of the concentrated white liquid and the coal cinder after chemical component recovery are respectively discharged. Gasification processes are also provided. The system improves the energy utilization efficiency of the black liquor, effectively reduces the emission of pollution gas and is suitable for popularization.
Description
Technical Field
The invention belongs to the technical field of coal gasification, and particularly relates to a gasification system for preparing gasified gas by using black liquid coal water slurry and a gasification process thereof.
Background
The pulping black liquor accounts for 90 percent of the pollution amount of the paper industry, is a complex pollution system with high alkalinity and high COD, and can cause water body pollution and serious damage to the ecological environment if the pulping black liquor is directly discharged without treatment. At present, the practical engineering application of papermaking black liquor treatment is mainly based on the traditional alkali recovery system, and the practical engineering application plays roles of recovering chemical components from black liquor, reconstructing and combining new cooking liquor, recovering energy by burning organic residues, reducing pollution to air and water and the like. But still has the defects of low power generation efficiency of the recovery boiler, molten water explosion, sulfur-containing gas emission and the like; in terms of power generation, the energy efficiency of conventional recovery boilers is very low, about 9-14%. Therefore, if a process for eliminating the evaporation and concentration process can be developed, the internal energy consumption of the system can be remarkably reduced, and the efficient utilization of biomass energy can be realized.
For the above mentioned black liquor treatment problem, whether the traditional alkali recovery system or the black liquor gasification system faces the problem of the important energy consumption section of thin black liquor evaporation, and the process of recovering the chemical components in the black liquor is also an energy consumption and conversion process; aiming at the problems of low energy conversion efficiency, sulfur-containing gas emission, low effective gas content of black liquor gasification synthesis gas, large amount of steam consumption for concentration of dilute black liquor and the like in the traditional recovery process; researchers put forward that the coal water slurry is prepared by using the dilute black liquor, but the research on the coal water slurry containing the black liquor is very little at present, the research is still basically on the analysis of the pulping performance of the coal water slurry prepared by using the black liquor, the follow-up research and discussion on the utilization of the coal water slurry containing the black liquor is not fully carried out, and the following challenges are still faced at present: 1. the treatment capacity of the dilute black liquor is limited, the amount of the dilute black liquor generated by a pulping factory is very considerable generally, but the amount of the black liquor utilized for preparing the black liquor coal water slurry is limited; 2. black liquid coal water slurry is generally applied to combustion and gasification, and energy utilization efficiency is always in urgent need of consideration.
For the above mentioned problem of black liquor coal water slurry treatment, few researchers are studying, and some researchers are paying attention to adding a small amount of black liquor into coal water slurry, thereby achieving the purpose of increasing the gasification performance of the coal water slurry; or the research on the coal water slurry and black liquor coal water slurry in the gasification process is eagerly performed. Much research is still lacking in the application of black liquor coal water slurry gasification systems to pulp mills.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for preparing gasified gas by utilizing black liquor coal water slurry and a gasification system thereof, and the specific scheme is as follows:
utilize black liquor coal water slurry to prepare gasification system of gas, include:
the black liquid coal water slurry preparation unit is used for receiving coal and the dilute black liquid and preparing and storing the black liquid coal water slurry;
the gasification unit is used for gasifying the black liquid coal water slurry to generate crude synthesis gas and coal slag;
an air separation unit for providing oxygen to the gasification unit;
the sensible heat recovery unit is used for sensible heat recovery of the crude synthesis gas and the coal slag generated by the gasification unit so as to generate high-temperature and high-pressure steam;
the thermoelectric unit is used for reheating the high-temperature high-pressure steam generated by the sensible heat recovery unit and converting the reheated high-temperature high-pressure steam into superheated steam, and then respectively supplying the superheated steam to the air separation device for producing oxygen and the generator set for converting the superheated steam into electric energy;
and the chemical recovery unit is used for recovering chemical components and crude synthesis gas in the coal cinder discharged by the sensible heat recovery unit, and part of generated concentrated white liquid is used for recovering hydrogen sulfide in the crude synthesis gas passing through the sensible heat recovery unit so as to be discharged in the form of gasified gas and white liquid, part of the gasified gas is sent into the thermoelectric unit through a pipeline to be used as fuel, and the white liquid, the residual gasified gas, the residual concentrated white liquid and the coal cinder after the chemical components are recovered are all discharged through the pipeline.
Further, black liquor coal water slurry preparation unit is including the breaker, dry mill, the device of kneading and mixing, agitating unit, the thick liquid device of straining and the product jar that connect gradually, the breaker entry receives the coal, kneads and mixes the device inlet and inserts diluted black liquor, and the agitating unit feed inlet inserts the additive, and the slag notch department of straining the thick liquid device connects the dry mill feed inlet.
Furthermore, a material conveying device for conveying the black liquid coal water slurry is connected between the black liquid coal water slurry preparation unit and the gasification unit, the air separation device converts the accessed air into oxygen for output, the gasification unit comprises a gasification furnace, and the gasification furnace gasifies the black liquid coal water slurry to generate crude synthesis gas and coal slag.
Further, the sensible heat recovery unit includes radiation boiler and convection boiler, insert the oxygen-removed water on the pipeline of radiation boiler and convection boiler respectively, the radiation boiler carries out a sensible heat recovery with the coarse synthesis gas and the cinder of gasification unit in order to produce once high temperature high pressure steam, and the convection boiler will carry out the secondary sensible heat recovery through the partial coarse synthesis gas after the once sensible heat recovery of radiation boiler in order to produce secondary high temperature high pressure steam.
Further, the thermoelectric unit comprises a steam superheater and a generator set, the steam superheater is used for reheating high-temperature high-pressure steam of the sensible heat recovery unit into superheated steam, part of the superheated steam enters the air separation unit through a pipeline and is used for producing oxygen, the rest superheated steam generates electric energy and low-temperature low-pressure steam after passing through the generator set, and the low-temperature low-pressure steam is discharged through the pipeline.
Further, the chemical recovery unit comprises a causticizing unit and an absorption device, wherein the causticizing unit is used for discharging a part of finally generated concentrated white liquid and the cinder subjected to chemical component recovery through pipelines respectively after recovering chemical components of the cinder generated by the gasification unit, and the part of the concentrated white liquid is sent to the absorption device; the absorption device is used for receiving part of the concentrated white liquid of the causticizing unit and the crude synthesis gas of the sensible heat recovery unit, enabling the concentrated white liquid to absorb hydrogen sulfide in the crude synthesis gas of the sensible heat recovery unit and then discharge the hydrogen sulfide in the form of gasified gas and white liquid, finally sending part of the gasified gas into the thermoelectric unit through a pipeline to serve as fuel, and discharging the rest of the gasified gas through a pipeline.
The gasification process for preparing gasified gas by utilizing black liquid coal water slurry comprises the following steps:
step 2, air is connected into the air separation device to be converted into oxygen to be output so as to provide oxygen for the gasification unit;
THE ADVANTAGES OF THE PRESENT INVENTION
1. The gasification system for preparing the gasified gas by using the black liquid coal water slurry replaces the traditional black liquid alkali recovery system, thereby not only saving an evaporation unit in the traditional evaporation system, but also replacing the original combustion boiler by using the gasification furnace, and improving the energy utilization efficiency of the black liquid.
2. The gasification system for preparing the gasified gas by utilizing the black liquid coal water slurry can obviously improve the energy efficiency and can obviously reduce the emission of the polluted gas.
Drawings
FIG. 1 is a schematic diagram of a gasification system for preparing gasification gas from black liquor coal water slurry according to the present invention.
In the figure:
1. a black liquid coal water slurry preparation unit; 2. an air separation plant; 3. a feeding device; 4. a gasification unit; 401. a gasification furnace; 5. a sensible heat recovery unit; 501. a radiant boiler; 502. a convection boiler; 6. a thermoelectric unit; 601. a steam superheater; 602. a generator set; 7. a chemical recovery unit; 701. a causticizing unit; 702. an absorption device; 101. a crusher; 102. a dry mill; 103. a kneading device; 104. a stirring device; 105. a slurry filtering device; 106. a product tank; 8. coal; 9. dilute black liquor; 10. an additive; 11. black liquor coal water slurry; 12. air; 13. oxygen gas; 14. crude synthesis gas; 15. coal slag; 16. removing oxygen water; 17. primary high-temperature high-pressure steam; 18. secondary high-temperature high-pressure steam; 19. superheated steam; 20. electrical energy; 21. gasifying gas; 22. concentrating white liquor; 23. white liquor; 24. recovering the coal cinder after chemical components are recovered; 25. low-temperature low-pressure steam;
Detailed Description
The present invention is further explained below with reference to the drawings and the embodiments, and it should be noted that the embodiments are not intended to limit the scope of the present invention.
As shown in fig. 1, the gasification system for preparing gasification gas by using black liquor coal water slurry in the embodiment includes:
the black liquid coal water slurry preparation unit 1 is used for receiving coal and dilute black liquid and preparing and storing black liquid coal water slurry; specifically, the black liquor coal water slurry preparation unit 1 comprises a crusher 101, a dry mill 102, a kneading device 103, a stirring device 104, a slurry filtering device 105 and a product tank 106 which are connected in sequence, wherein an inlet of the crusher 101 receives coal 8, a liquid inlet of the kneading device 103 is connected to the diluted black liquor 9, a liquid inlet of the stirring device 104 is connected to an additive 10, preferably, the additive is a stabilizer and a dispersant which are mixed in proportion, the stabilizer adopts sodium carboxymethylcellulose, and the dispersant adopts sodium polynaphthalene formaldehyde sulfonate, but the invention is not limited thereto. The preparation process of the black liquid coal water slurry 11 is as follows: the coal 8 is sent into a crusher 101 to be crushed and then sent into a dry mill 102 to be ground into coal powder, the coal powder and the dilute black liquor 9 enter a kneading device 106 to be kneaded, the kneaded coal powder, the dilute black liquor 9 and an additive 10 enter a stirring device 104 to be stirred and mixed, the black liquor coal-water slurry 11 after being stirred and mixed enters a product tank 106 to be stored after being filtered by a slurry filtering device 105, a slag discharge port of the slurry filtering device 105 is connected with a feed port of the dry mill 102, so that residual filter slag after being filtered by the slurry filtering device 105 enters the dry mill 102 from a slag discharge port of the slurry filtering device 105 to be ground again together with the coal crushed by the crusher 101, and the operation of preparing the black liquor 11 at the next time is continued, and the use efficiency of the filter slag is improved.
An air separation unit 2 for supplying oxygen 13 to the gasification unit 4; specifically, the air inlet of the air separation unit 2 receives the air 12 and then converts the air into oxygen 13, and the oxygen is output from the air outlet of the air separation unit.
A material conveying device 3 is connected between the black liquid coal water slurry preparation unit 1 and the gasification unit 4, and the material conveying device 3 is used for conveying the black liquid coal water slurry 11 prepared by the black liquid coal water slurry preparation unit 1 to the gasification unit 4. The material conveying device 3 is a coal slurry pump.
A gasification unit 4 for gasifying black liquor coal water slurry 11 to produce raw synthesis gas 14 and coal slag 15; specifically, the gasification unit 4 comprises a gasification furnace 401, the material conveying device 3 is used for respectively conveying the black liquid coal water slurry 11 filled in the product tank 106 and the oxygen 13 output from the air separation device 2 into the gasification furnace 401, and the gasification furnace 401 is used for gasifying the black liquid coal water slurry 11 and the oxygen 13 to generate the raw synthesis gas 14 and the coal slag 15. Preferably, each gasifier 401 is a Desshi ancient coal water slurry pressurized gasifier with the handling capacity of 2000t/d, and the oxidant is oxygen 13 provided by the air separation unit 2; oxygen production per air separation plant 2 was 8 km3H; the requirements of the gasification furnace 401 and the air separation device 2 in the black liquid coal water slurry gasification system are obtained by calculation according to the production scale.
A sensible heat recovery unit 5 for sensible heat recovering the raw synthesis gas 14 and the coal slag 15 generated from the gasification unit 5 to generate high-temperature and high-pressure steam; specifically, the sensible heat recovery unit 5 comprises a radiation boiler 501 and a convection boiler 502, wherein deoxygenated water 16 is connected to a pipeline between the radiation boiler 501 and the convection boiler 502, and the deoxygenated water 16 is used for entering the radiation boiler 501 and the convection boiler 502 to generate high-temperature and high-pressure steam. The radiant boiler 501 performs primary sensible heat recovery on the raw synthesis gas 14 and the coal cinder 15 of the gasification furnace 401 to produce primary high-temperature high-pressure steam 17, and the convection boiler 402 performs secondary sensible heat recovery on the raw synthesis gas 14 after the primary sensible heat recovery of the radiant boiler 401 to produce secondary high-temperature high-pressure steam 18. Sensible heat recovered by the radiant boiler 401 and the convection boiler 402 is used to produce high temperature, high pressure steam.
A thermoelectric unit 6 for reheating and converting the high-temperature and high-pressure steam generated by the sensible heat recovery unit 5 into superheated steam 19 for respectively supplying the air separation plant 2 with oxygen 13 and electric energy 20; specifically, the thermoelectric unit 6 comprises a steam superheater 601 and a generator set 602, the steam superheater 601 heats the primary high-temperature high-pressure steam generated by the radiation boiler 501 and the secondary high-temperature high-pressure steam generated by the convection boiler 502 again to convert the primary high-temperature high-pressure steam into superheated steam 19, a part of the superheated steam 19 enters the air separation device 2 through a pipeline for producing oxygen, the rest of the superheated steam 19 passes through the generator set 602 to generate electric energy and low-temperature low-pressure steam 25, and the low-temperature low-pressure steam 25 is discharged through a pipeline. Preferably, the equipment of the thermoelectric unit 6 is set according to the production of electric energy 20.
And a chemical recovery unit 7 for recovering chemical components in the coal cinder 15 discharged from the sensible heat recovery unit 5 and the residual raw synthesis gas 14 in the convection boiler 502, and using the generated part of the concentrated white liquor 22 for recovering hydrogen sulfide in the raw synthesis gas 14 passing through the sensible heat recovery unit 5, so as to discharge the part of the vaporized gas 21 and the white liquor 23, wherein the part of the vaporized gas 21 enters the thermoelectric unit 6 through a pipeline to serve as fuel, and the white liquor 23, the residual vaporized gas 21, the residual concentrated white liquor 22 and the coal cinder 24 after the recovery of the chemical components are all discharged through pipelines. Specifically, the chemical recovery unit 7 includes a causticizing unit 701 and an absorption apparatus 702, and the absorption apparatus 702 is a falling film absorption tower, a packed absorption tower or an absorption recycle tank. The causticizing unit 702 comprises a dissolving tank, a stabilizing tank, a nitrator and a causticizer (not shown), and the chemical recovery unit 7 is the same as the causticizing system in the traditional alkali recovery system, so the detailed description thereof is omitted. The absorption device 702 is used for receiving the concentrated white liquid 22 fed by the causticizing unit 701 and the raw synthesis gas 14 fed by the convection boiler 502, so that the concentrated white liquid 22 absorbs the hydrogen sulfide in the raw synthesis gas fed by the convection boiler 502And finally discharged in the form of boil-off gas 21 and white liquor 23. The coal cinder 15 produced by the gasification furnace 401 is sequentially sent into a dissolving tank, a stabilizing tank, a nitrator and a causticizer for chemical component recovery, part of the finally produced concentrated white liquor 22 and the coal cinder 15 after chemical component recovery are respectively discharged through pipelines, and part of the concentrated white liquor is sent into an absorption device 702; the absorption device 702 is configured to receive a part of the concentrated white liquid 22 of the causticizing unit and the raw synthesis gas 14 of the convection boiler 502, make the concentrated white liquid 22 absorb hydrogen sulfide in the raw synthesis gas 14 of the convection boiler 502, and then discharge the hydrogen sulfide in the form of the gasified gas 21 and the white liquid 23, finally feed a part of the gasified gas 21 into the steam superheater 601 through a pipeline as fuel, and discharge the rest of the white liquid 23, the part of the gasified gas 21, the concentrated white liquid 22 and the coal slag 24 after recovery of chemical components through pipelines. The white liquor contains NaOH and Na2And S, the concentrated white liquor contains NaOH.
The invention also provides a gasification process for preparing gasified gas by using the black liquid coal water slurry, which comprises the following steps:
step 2, air is connected into the air separation device 2 and is converted into oxygen 13 to be output, so that oxygen is provided for the gasification furnace 401;
step 5, reheating the primary high-temperature high-pressure steam 17 and the secondary high-temperature high-pressure steam 18 in the step 3 into superheated steam 19 in a steam superheater 601, sending part of the superheated steam 19 into an air separation unit 2 through a pipeline to produce oxygen 13, generating electric energy and low-temperature low-pressure steam 25 by the rest superheated steam 19 through a generator set 602, and discharging the low-temperature low-pressure steam 25 through a pipeline; the coal cinder 15 discharged from the radiation boiler 401 in the step 4 is sent to a dissolving tank of a causticizing unit 701, chemical components of the coal cinder 15 are recovered through a stabilizing tank, a nitrator and a causticizer, and a part of generated concentrated white liquid 22 is sent to an absorption device 702 for absorbing hydrogen sulfide of the raw synthesis gas 14 of the convection boiler 402 sent in the step 4 and discharged in the form of gasified gas 21 and white liquid 23, a part of the gasified gas 21 enters a steam superheater 601 through a pipeline to be used as fuel, and the white liquid 23, the rest of the gasified gas 21, the rest of the concentrated white liquid 22 and the coal cinder 24 after chemical components are recovered are all discharged through pipelines.
Practical applications of the gasification system of this embodiment are listed below:
the treatment capacity of the thin black liquor 9 of a certain sulfate pulping plant is 304.4t/h, and the concentration of the thin black liquor 9 is 12 percent.
The concentration of the black liquid coal water slurry 11 prepared by the black liquid coal water slurry preparation unit 1 in the embodiment is 65%, the content of the additive 10 is 0.4%, wherein the mass ratio of the dispersant to the stabilizer in the additive is 3: 2, the percentage of the weak black liquor 9 is 40 percent, the percentage of the coal powder 8 is 59.6 percent, and the low-grade calorific value of the black liquor coal-water slurry 11 is 17461.65 kJ/kg.
The prepared black liquid coal water slurry 11 comprises the following elements in percentage by weight: carbon: 69.71 percent; hydrogen: 4.83 percent; oxygen: 13.03 percent; nitrogen: 0.76 percent; sulfur: 0.55; na: 0.06 percent; ash content: 11.05 percent.
The temperature of the black liquor coal water slurry 11 entering the gasification furnace 401 is 45 ℃, the gasification temperature is 1370 ℃, the gasification pressure is 4Mpa, the environmental temperature is 0 ℃, the oxygen-coal ratio is 0.97kg/kg, and the carbon conversion rate is 97%.
The air separation plant 2 provides an oxygen concentration of 98%.
In the present example, each component of the raw synthesis gas 14 is separatedIs CO, CO2、H2、NH3、H2S and H2And the content of O is calculated according to the material balance in the gasification process.
The steam superheater 601 has the thermal efficiency of 90%, the relative internal efficiency of a steam turbine in the generator unit 602 is 76%, the mechanical efficiency is 98%, and the generator efficiency is 97%.
The demand of the absorption device 702 for the absorption liquid is calculated according to the content of hydrogen sulfide in the raw synthesis gas, and at the same time, every 5mol of hydrogen sulfide is consumed, the absorption liquid will also absorb 1mol of carbon dioxide.
The causticizing unit 701 of the chemical recovery unit 7 is the same as that of the conventional soda recovery system.
In this embodiment, the raw synthesis gas 14 of the absorption device 702 is the prepared black liquid coal water slurry gasification gas with a carbon monoxide and hydrogen total ratio of 80.15%.
It is clear that the invention is not only applicable to the black liquor treatment process described in the examples, but can easily be extended to other similar kraft pulp mills.
Claims (7)
1. Utilize black liquid coal water slurry to prepare gasification gas's gasification system, its characterized in that includes:
the black liquid coal water slurry preparation unit is used for receiving coal and the diluted black liquid and preparing and storing black liquid coal water slurry;
the gasification unit is used for gasifying the black liquid coal water slurry to generate crude synthesis gas and coal slag;
an air separation unit for providing oxygen to the gasification unit;
the sensible heat recovery unit is used for sensible heat recovery of the raw synthesis gas and the coal slag generated by the gasification unit so as to generate high-temperature and high-pressure steam;
the thermoelectric unit is used for reheating the high-temperature high-pressure steam generated by the sensible heat recovery unit and converting the reheated high-temperature high-pressure steam into superheated steam, and then respectively supplying the superheated steam to the air separation device for producing oxygen and the generator set for converting the superheated steam into electric energy;
and the chemical recovery unit is used for recovering chemical components and residual crude synthesis gas in the coal slag discharged by the sensible heat recovery unit, and part of generated concentrated white liquid is used for recovering hydrogen sulfide in the crude synthesis gas passing through the sensible heat recovery unit so as to be discharged in the form of gasified gas and white liquid, part of the gasified gas is sent into the thermoelectric unit through a pipeline to be used as fuel, and the white liquid, the residual gasified gas, the residual concentrated white liquid and the coal slag after the chemical components are recovered are all discharged through the pipeline.
2. The gasification system for preparing gasified gas by using black liquor coal-water slurry according to claim 1, wherein the black liquor coal-water slurry preparation unit comprises a crusher, a dry mill, a kneading device, a stirring device, a slurry filtering device and a product tank which are connected in sequence, wherein an inlet of the crusher receives coal, a liquid inlet of the kneading device is connected with the dilute black liquor, a feed inlet of the stirring device is connected with an additive, and a slag discharge port of the slurry filtering device is connected with a feed inlet of the dry mill.
3. The gasification system for preparing gasification gas by using black liquor coal water slurry as claimed in claim 1, wherein a material conveying device for conveying black liquor coal water slurry is connected between the black liquor coal water slurry preparation unit and the gasification unit, the air separation device converts the introduced air into oxygen to be conveyed into the gasification unit, the gasification unit comprises a gasification furnace, and the gasification furnace gasifies the black liquor coal water slurry to produce crude synthesis gas and coal slag.
4. The gasification system for preparing gasified gas by using black liquor coal-water slurry according to claim 1, wherein the sensible heat recovery unit comprises a radiation boiler and a convection boiler, the pipelines of the radiation boiler and the convection boiler are respectively connected with deoxygenated water, the radiation boiler performs primary sensible heat recovery on the raw synthesis gas and the coal slag of the gasification unit to produce primary high-temperature high-pressure steam, and the convection boiler performs secondary sensible heat recovery on part of the raw synthesis gas after the primary sensible heat recovery of the radiation boiler to produce secondary high-temperature high-pressure steam.
5. The gasification system for preparing gasified gas by using black liquor coal-water slurry as claimed in claim 1, wherein the thermoelectric unit comprises a steam superheater and a generator set, the steam superheater is used for reheating high-temperature high-pressure steam of the sensible heat recovery unit into superheated steam, part of the superheated steam enters the air separation device through a pipeline for producing oxygen, the rest superheated steam enters the generator set through a pipeline, electric energy and low-temperature low-pressure steam are produced after passing through the generator set, and the low-temperature low-pressure steam is discharged through a pipeline.
6. The gasification system for preparing gasified gas by using black liquor coal-water slurry as claimed in claim 1, wherein said chemical recovery unit comprises a causticization unit and an absorption device, the causticization unit is used for discharging a part of the finally generated concentrated white liquor and the coal slag after chemical component recovery respectively through a pipeline after recovering chemical components of the coal slag generated by said gasification unit, and a part of the concentrated white liquor is sent to the absorption device; the absorption device is used for receiving part of the concentrated white liquid of the causticizing unit and the crude synthesis gas of the sensible heat recovery unit, enabling the concentrated white liquid to absorb hydrogen sulfide in the crude synthesis gas of the sensible heat recovery unit and then discharge the hydrogen sulfide in the form of gasified gas and white liquid, finally sending part of the gasified gas into the thermoelectric unit through a pipeline to serve as fuel, and discharging the rest of the gasified gas through a pipeline.
7. The gasification process for preparing gasification gas by using black liquor coal water slurry is characterized by comprising the following steps:
step 1, providing coal and dilute black liquor to a black liquor coal water slurry preparation unit to prepare and store black liquor coal water slurry;
step 2, air is connected into the air separation device to be converted into oxygen to be output so as to provide oxygen for the gasification unit;
step 3, gasifying the black liquor coal water slurry obtained in the step 1 in a gasification unit to obtain crude synthesis gas and coal slag;
step 4, recovering the crude synthesis gas and the coal slag in the step 3 in a sensible heat recovery unit to generate high-temperature high-pressure steam, and sending the residual crude synthesis gas to a chemical recovery unit;
step 5, reheating the high-temperature high-pressure steam in the step 4 into superheated steam in a thermoelectric unit, and respectively supplying the superheated steam to an air separation plant for producing oxygen and a generator set for converting into electric energy; and (3) recovering chemical components of the coal slag discharged by the sensible heat recovery unit in the step (4) in the chemical recovery unit, and using the generated part of the concentrated white liquid for recovering hydrogen sulfide in the crude synthesis gas passing through the sensible heat recovery unit so as to discharge the hydrogen sulfide in the form of gasified gas and white liquid, wherein part of the gasified gas enters the thermoelectric unit through a pipeline to serve as fuel, and the white liquid, the residual gasified gas, the residual concentrated white liquid and the coal slag after the recovery of the chemical components are all discharged through the pipeline.
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