CN102888251B - Coal-based synthetic gas waste heat recovery system and method - Google Patents
Coal-based synthetic gas waste heat recovery system and method Download PDFInfo
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- CN102888251B CN102888251B CN201210344568.6A CN201210344568A CN102888251B CN 102888251 B CN102888251 B CN 102888251B CN 201210344568 A CN201210344568 A CN 201210344568A CN 102888251 B CN102888251 B CN 102888251B
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- heated
- flying dust
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- 239000007789 gas Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000003245 coal Substances 0.000 title claims abstract description 26
- 239000002918 waste heat Substances 0.000 title claims abstract description 15
- 238000011084 recovery Methods 0.000 title claims abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract description 21
- 239000000428 dust Substances 0.000 claims description 25
- 238000005406 washing Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005338 heat storage Methods 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000003786 synthesis reaction Methods 0.000 claims description 11
- 230000035939 shock Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 abstract 6
- 238000004140 cleaning Methods 0.000 abstract 3
- 230000008569 process Effects 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 11
- 238000002309 gasification Methods 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000010866 blackwater Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 101000749837 Bos taurus Leukocyte cell-derived chemotaxin 1 Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention provides a coal-based synthetic gas waste heat recovery system and a method. According to the system and the method, a heat storing body is adopted for recovering high-level heat in synthetic gas so as to heat gas with demand on high temperature. The coal-based synthetic gas waste heat recovery system comprises a quenching chamber (1), a heat storing type heat exchanger (2), a heat exchanger (3), a cyclone separator (4), a lock bucket (5), a wet cleaning unit (6) and a quenching gas compressor (7), wherein the quenching chamber (1), the heat storing type heat exchanger (2), the heat exchanger (3), the cyclone separator (4) and the wet cleaning unit (6) are sequentially connected; gas to be heated is inversely input to the heat exchanging type heat exchanger (2) to be heated and then transferred to a downstream user; the lock bucket (5) is connected with the cyclone separator (4); the synthetic gas washed by the wet cleaning unit (6) is input to the heat exchanger (3) to be heated and then is transferred into the quenching gas compressor (7); and the quenching gas compressor (7) is connected with the quenching chamber (1) of a gasifying furnace.
Description
Technical field
The present invention relates to a kind of coal based synthetic gas Waste Heat Recovery System (WHRS) and recovery method.
Background technology
Along with the scarcity day by day of petroleum and natural gas resource, the utilization that cleans of coal is more and more subject to people's attention.Develop the key that large-scale Coal Gasification Technology is clean utilization coal resources.In the middle of large-scale Coal Gasification Technology, air flow bed technology gets most of the attention.Air flow bed technology comprises standby coal, vapourizing furnace and three parts of follow-up flow process.Standby coal mode has fine coal and two kinds of modes of coal water slurry, and vapourizing furnace mainly contains top spray, two kinds of type of furnaces of flat spray, and follow-up flow process mainly contains waste heat boiler and two kinds of flow processs of water Quench.This three parts technique be mutually combined to form various entrained flow bed gasification technologies, as air-flow bed coal-gasification technology such as Shell bed pulverized coal gasification technology (SCGP), G.E. coal water slurry gasification technology and GSP, HT-L, CROLIN, two sections of stoves, E-GAS.In the middle of various air-flow bed coal-gasification technology, the effect of follow-up flow process is all extremely important.Follow-up flow process comprises Quench, waste heat recovery, ash disposal, washing and the related procedure of synthetic gas.Preferably follow-up flow process not only should reduce facility investment as much as possible, reduces the cost of crude synthesis gas ash disposal, washing, and optimization is connected and coupling with downstream section, also should effectively reclaim the entrained higher-grade heat energy of crude synthesis gas.
The follow-up flow process of having realized commercialized running mainly contains and comprises waste heat boiler technique and water chilling process technique.
Waste heat boiler technique: from vapourizing furnace crude synthesis gas out, Quench is solidified after flying dust, through conductive sections and syngas cooler, in generation, press after superheated vapour, after the ash disposal of High Temperature High Pressure porcelain filter, enter and wash unit again, remove part sour gas and residual flying dust, synthetic gas part after washing is as Quench gas, and all the other are delivered to lower procedure and further process.Due to the impact of coal, often there is serious dust stratification in waste heat boiler, thereby be designed with complicated soot blower, but operating performance is still undesirable, and used heat can not high efficiente callback.The synthetic gas temperature of waste heat boiler outlet is also often approached safety interlocking value, affects the steady running of gasification machinery.
Water chilling process technique: from vapourizing furnace crude synthesis gas out, in downtake, with chilled water and flow to into slag bath, synthetic gas removes the gred after cooling through water-bath, then washes tower through Venturi scrubber and carbon, removes part sour gas and residual ash content, after saturated by water vapor, deliver to downstream section.Chilling process is relatively simple, but synthetic gas used heat can not higher-grade ground reclaim, be especially not suitable for gasification combined power generation device (IGCC); Black water treatment system scale is also larger, and running cost is higher.
The two chilling process of air water that other technology also has Shell Co. Ltd once to propose.This technique is first used Clean synthesis gas, by crude synthesis gas Quench to 900 ℃, then is cooled to 500 ℃ with atomized water, and cyclonic separation is most dry ash wherein, and then washing is cooled to 220～230 ℃.In synthetic gas, the content of water vapour can reach 60%, can hold in the mouth the high water to steam ratio sulfur resistant conversion process of joint.This technique has been saved syngas cooler, and the thermo-efficiency of whole device is lower; But due to Bian Quench compressor, more complicated than water chilling process.
Summary of the invention
The object of this invention is to provide a kind of coal based synthetic gas Waste Heat Recovery System (WHRS) and method.This system and method utilizes heat storage to reclaim the entrained higher-grade heat energy of synthetic gas, is used for heating the gas that has high temperature demands.
Coal based synthetic gas Waste Heat Recovery System (WHRS) of the present invention comprises: shock chamber, heat regenerator, interchanger, cyclonic separator, lock hopper, wash unit and chill air compressor, described shock chamber, heat regenerator, interchanger, cyclonic separator with wash unit and be connected successively, gas to be heated is reverse to be entered described heat regenerator and heats and be transported to downstream user, described lock hopper is connected with cyclonic separator, through described in wash unit washing synthetic gas partly enter in described interchanger and enter described chill air compressor after heating, described chill air compressor is connected with described vapourizing furnace shock chamber.
Preferably, described heat regenerator inside is provided with many group heat storages, adopts mechanism conversion heat storage position.Further preferably, described heat regenerator adopts continuous rotary structure of reversing valve.
Preferably, described in, wash in unit and be provided with Venturi scrubber and wash tower.
Coal based synthetic gas waste recovery method of the present invention comprises the steps:
The Quench of A, hot synthesis gas: in shock chamber, be cold synthetic gas Quench to 800～1000 ℃ of 180～220 ℃ by temperature by vapourizing furnace crude synthesis gas out, solidify flying dust wherein;
B, used heat heat accumulating type reclaim: the synthetic gas after Quench, by heat regenerator and interchanger, is cooled to 200～300 ℃, delivers to cyclonic separator; The reverse heat regenerator that enters of gas to be heated, is heated to after 400～900 ℃, is transported to downstream user;
The cyclonic separation of C, flying dust: the synthetic gas reclaiming after used heat is isolated more than 85～95% contained flying dusts by cyclonic separator; Flying dust is by lock hopper, and timing and isolation of system, after air lift and displacement, be down to flying dust temperature below 80 ℃, is disposed to storage tank;
Washing of D, synthetic gas: enter and wash unit and wash from the synthetic gas of cyclonic separator; In interchanger, the synthetic gas after washing is partly heated to 180 ~ 220 ℃, delivers to chill air compressor, and all the other deliver to downstream unit.
Heat regenerator inside can be designed to pile up the structure that has many group heat storages, adopt mechanism conversion heat storage position, for example can adopt continuous rotary structure of reversing valve, realize cold and hot gas alternating current through heat storage, realize the transmission of heat, and because alternately changing of air flow line effectively prevents the sticky stifled of flying dust.
Preferably, in washing unit, by Venturi scrubber, soak wherein residual flying dust, then enter and wash tower, by spray water counter flow washing.
The object of the invention is ordinary metallic material interchanger and be beyond one's reach, and because cold and hot gas alternating direction in heat regenerator is by the principle of heat storage, can effectively prevent that flying dust is sticky stifled; The synthetic gas reclaiming after used heat first passes through cyclonic separator, after the flying dust that separation is carried secretly, then washes, to reduce facility investment and usage on black water expense.
Accompanying drawing explanation
Fig. 1 is the system diagram that heat accumulating type of the present invention reclaims synthetic gas used heat.
Embodiment
Below by embodiment, illustrate in greater detail coal based synthetic gas Waste Heat Recovery System (WHRS) of the present invention and method.
Referring to Fig. 1, the vapourizing furnace institute production of synthetic gas used heat heat accumulating type removal process that the coal feeding amount of take is 500kg/h is example.
Fine coal and oxygen, steam enter vapourizing furnace, carry out gasification reaction under 0.8MPa, and oxygen coal when water oxygen ratio is controlled at respectively 0.8kg/kg, 0.09kg/kg.Temperature is that the crude synthesis gas of 1500 ℃ of left and right enters vapourizing furnace shock chamber 1, is Quench gas Quench to the 1000 ℃ left and right of 200 ℃ by temperature.Synthetic gas after Quench, by heat regenerator 2 and interchanger 3, is cooled to after 200～250 ℃, delivers to cyclonic separator 4.Reducing gas from follow-up workshop section enters heat regenerator 2, is heated to behind 900 ℃ of left and right, delivers to user.
Reclaim the synthetic gas of used heat and isolate more than 90% flying dust by cyclonic separator 4; The flying dust of separating enters in lock hopper 5; Lock hopper 5 timing and isolation of systems; In the lock hopper 5 of isolation, with nitrogen, flying dust is carried out to air lift, cooling, replace qualified and flying dust temperature be down to 80 ℃ following after, pressure release is disposed to storage tank.
Synthetic gas after separated flying dust enters and washes unit 6, first through residual flying dust in the wetting synthetic gas of Venturi scrubber; Then synthetic gas enters from washing tower bottom, by descending spray water counter flow washing, is cooled to 160 ℃, and part is heated to 200 ℃ through interchanger 3, delivers to chill air compressor 7; All the other enter downstream unit.
By above-described embodiment, concrete excellent effect of the present invention is as follows:
(1) this technique can directly reclaim higher-grade used heat, can be used to the gas that heating has high temperature demands, as the reducing gas of the hard stove machinery of gasification-gas base, can significantly fall the energy consumption of such device.
(2) because hot and cold gas replaces the reverse heat regenerator that enters, effectively prevented the sticky stifled of flying dust, improved the thermo-efficiency of coal gasification apparatus.
(3), owing to having adopted heat regenerator, can utilize cyclonic separator to carry out ash disposal to synthetic gas, related procedure thereby simple, compact.
(4) because cyclonic separator has been removed more than 90% flying dust, the Heisui River of washing unit generation is less, and usage on black water scale significantly reduces, and has also reduced the obstruction of Heisui River system and the wearing and tearing of equipment.
Claims (2)
1. a coal based synthetic gas Waste Heat Recovery System (WHRS), comprise: shock chamber (1), heat regenerator (2), interchanger (3), cyclonic separator (4), lock hopper (5), wash unit (6) and chill air compressor (7), described shock chamber (1), heat regenerator (2), interchanger (3), cyclonic separator (4) with wash unit (6) and be connected successively, gas to be heated is reverse to be entered described heat regenerator (2) and heats and be transported to downstream user, described lock hopper (5) is connected with described cyclonic separator (4), through described in wash unit (6) washing synthetic gas partly enter in described interchanger (3) and enter described chill air compressor (7) after heating, described chill air compressor (7) is connected with described vapourizing furnace shock chamber (1),
Wherein said heat regenerator (2) inside is provided with many group heat storages, adopts mechanism conversion heat storage position.
Wherein said heat regenerator (2) adopts continuous rotary structure of reversing valve,
Wherein said washing in unit (6) is provided with Venturi scrubber and washes tower.
2. a coal based synthetic gas waste recovery method that utilizes system described in claim 1, comprises the steps:
The Quench of A, hot synthesis gas: in shock chamber (1), be cold synthetic gas Quench to 800～1000 ℃ of 180～220 ℃ by temperature by vapourizing furnace crude synthesis gas out, solidify flying dust wherein;
B, used heat heat accumulating type reclaim: the synthetic gas after Quench, by heat regenerator (2) and interchanger (3), is cooled to 200～300 ℃, delivers to cyclonic separator (4); Gas to be heated is reverse enter heat regenerator (2) and be heated after, be transported to downstream user;
The cyclonic separation of C, flying dust: the synthetic gas reclaiming after used heat is isolated more than 85～95% contained flying dusts by cyclonic separator (4); Flying dust is by lock hopper (5), and timing and isolation of system, after air lift and displacement, be down to flying dust temperature below 80 ℃, is disposed to storage tank;
Washing of D, synthetic gas: enter and wash unit (6) and wash from the synthetic gas of cyclonic separator; In interchanger (3), the synthetic gas after washing is partly heated to 180～220 ℃, delivers to chill air compressor (7), and all the other deliver to downstream unit;
Wherein in described heat regenerator (2) inside, be designed to pile up the structure that has many group heat storages, adopt mechanism conversion heat storage position, realize cold and hot gas alternating current through heat storage, and prevent the sticky stifled of flying dust;
Wherein in washing unit (6), by Venturi scrubber, soak wherein residual flying dust, then enter and wash tower, by spray water counter flow washing.
Wherein gas to be heated is transported to downstream user after being heated to 400～900 ℃.
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| CN201210344568.6A CN102888251B (en) | 2012-09-17 | 2012-09-17 | Coal-based synthetic gas waste heat recovery system and method |
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| CN201210344568.6A CN102888251B (en) | 2012-09-17 | 2012-09-17 | Coal-based synthetic gas waste heat recovery system and method |
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| CN102888251A CN102888251A (en) | 2013-01-23 |
| CN102888251B true CN102888251B (en) | 2014-07-16 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103756730B (en) * | 2014-01-22 | 2015-02-04 | 杭州全合科技有限公司 | Heat accumulating type powdered coal entrained bed gasification method |
| CN104403702A (en) * | 2014-11-24 | 2015-03-11 | 水煤浆气化及煤化工国家工程研究中心 | Dedusting device for synthetic gas |
| CN105757675B (en) * | 2016-04-15 | 2018-01-19 | 神雾科技集团股份有限公司 | A kind of system and method for handling house refuse |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4478608A (en) * | 1981-09-22 | 1984-10-23 | L. & C. Steinmuller Gmbh | Method of treating process gases coming from a gasification reactor |
| CN101161792A (en) * | 2007-09-29 | 2008-04-16 | 上海惠生化工工程有限公司 | Heat recovering technique for synthetic gas production process by coal gasification |
| CN102250629A (en) * | 2011-06-13 | 2011-11-23 | 山西利华新科技开发有限公司 | Coking furnace capable of recycling heat energy and coking method |
| CN202359084U (en) * | 2011-11-30 | 2012-08-01 | 中国五环工程有限公司 | Coal gas purification system |
| CN202786151U (en) * | 2012-09-17 | 2013-03-13 | 北京神雾环境能源科技集团股份有限公司 | Recovery system for waste heat of coal-based synthesis gas |
-
2012
- 2012-09-17 CN CN201210344568.6A patent/CN102888251B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4478608A (en) * | 1981-09-22 | 1984-10-23 | L. & C. Steinmuller Gmbh | Method of treating process gases coming from a gasification reactor |
| CN101161792A (en) * | 2007-09-29 | 2008-04-16 | 上海惠生化工工程有限公司 | Heat recovering technique for synthetic gas production process by coal gasification |
| CN102250629A (en) * | 2011-06-13 | 2011-11-23 | 山西利华新科技开发有限公司 | Coking furnace capable of recycling heat energy and coking method |
| CN202359084U (en) * | 2011-11-30 | 2012-08-01 | 中国五环工程有限公司 | Coal gas purification system |
| CN202786151U (en) * | 2012-09-17 | 2013-03-13 | 北京神雾环境能源科技集团股份有限公司 | Recovery system for waste heat of coal-based synthesis gas |
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Denomination of invention: Coal-based synthetic gas waste heat recovery system and method Effective date of registration: 20180503 Granted publication date: 20140716 Pledgee: North International Trust Limited by Share Ltd. Pledgor: Shenwu Technology Group Co.,Ltd. Registration number: 2018990000286 |
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