CN101830432A - Method and device based on coal gasification for preparing hydrogen and separating CO2 - Google Patents
Method and device based on coal gasification for preparing hydrogen and separating CO2 Download PDFInfo
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- CN101830432A CN101830432A CN201010172522A CN201010172522A CN101830432A CN 101830432 A CN101830432 A CN 101830432A CN 201010172522 A CN201010172522 A CN 201010172522A CN 201010172522 A CN201010172522 A CN 201010172522A CN 101830432 A CN101830432 A CN 101830432A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a method and a device based on coal gasification for preparing hydrogen and separating CO2. Coal and water vapor enter a gasification reaction chamber for gasification to obtain H2, CO and CO2. CO is converted to CO2 through a transformation reaction, and CO2 is absorbed by CaO to generate CaCO3. H2 and remnant CO2 enter a gasification bed rising pipe, and CaCO3 and remnant coke enter a calcium oxide regeneration reaction chamber. Pure oxide is introduced to the calcium oxide regeneration reaction chamber, the coke is burned with the oxide, CaCO3 is decomposed to CO2 and CaO, CO2 is separated with the CaO by a separator and is collected, and CaO enters the bottom of the gasification bed rising pipe to be raised by the H2 and the remnant CO2, and the CO2 is absorbed. Parts of the H2 and the CaO return to the bottom of the gasification bed rising pipe through a recirculating pipe. The other part of the H2 and the CaO are separated by the separator to obtain purified H2, and the separated CaO returns to the gasification reaction chamber for cyclic utilization.
Description
Technical field
The present invention relates to the method and apparatus of gasification, particularly relate to a kind of coal and steam gasification of utilizing and produce hydrogen and separation of C O
2Method and apparatus.
Background technology
One of sustainable development strategies of energy utilization is to realize the high efficiency of energy clean utilization.Hydrogen is as clean energy, and in the conversion process of energy, following product is water, can really realize zero release of pollutant, and directly combustion power generation, heat supply is perhaps as onboard fuel.Along with the whole world " Oil Safety ", " greenhouse gas emission Greenhouse effect " and " environment protection " problem are increasingly serious; reduce interdependency to oil; strengthen the capture of carbonic acid gas and seal up for safekeeping; reduce influence to environment; in the sustainable energy system in future; hydrogen is expected to become the important energy carrier; be subjected to the extensive attention of various countries; but regrettably the hydrogen of occurring in nature is to exist with the chemical combination attitude mostly, must be obtained by the conversion of carbon containing primary energy source such as other primary energy source such as Sweet natural gas, coal, biomass as secondary energy.It is the country of main energy sources with coal that China is one, and under the prerequisite of this fundamental realities of the country, in following half a century, in the selection of the energy, coal will still played the part of important role.But coal can give off a large amount of CO in the process that Hydrogen Energy transforms
2, the Greenhouse effect that cause thus produce serious negative impact to ecotope, simultaneously the CO that discharges in the hydrogen production process based on coal
2Quantity quite huge, hydrogen will disappear as the advantage of clean energy.Therefore, in the coal hydrogen production process, effectively separate and capture CO
2Become and realize that coal cleans one of key of hydrogen manufacturing on a large scale.
Summary of the invention
The invention provides a kind of based on coal gasification for preparing hydrogen and separation of C O
2Method and device thereof.The present invention effective separation of C O when utilizing coal to produce hydrogen
2, have the advantage that reduces greenhouse gas emission.
Method and technology scheme of the present invention is as follows:
A kind of based on coal gasification for preparing hydrogen and separation of C O
2Method.Coal dust is sent in the mixing gasifying reaction chamber by material feeder, fed water vapour in the lower end of mixing gasifying reaction chamber, coal generates coke through pyrolysis, and coke and the reaction of water vapour generating gasification generate H
2, CO and CO
2CO and water vapour generation transformationreation
, generate H
2With CO
2, CO
2The CaO that is entered the mixing gasifying reaction chamber from the returning charge groove absorbs CO
2Be cured as CaCO
3Because CO
2Absorbed curing by CaO, the transformationreation balance moves right, and CO constantly is converted into CO by transformationreation
2, and absorbed by CaO thereupon; Remaining CO
2With H
2Leave the mixing gasifying reaction chamber, and enter the gasifier bed riser tube through the gasification reactor chamber transition section.CaCO in the mixing gasifying reaction chamber
3Enter calcium oxide regenerative response chamber with coke through second overflow groove, feed pure oxygen in the lower end of calcium oxide regenerative response chamber, coke and oxygen combustion, the heat of release make calcium oxide regenerative response chamber keep high temperature, CaCO
3Decompose, obtain CaO and CO
2, CaO obtains regeneration; CaO after the regeneration and CO
2Pass through the Regenerative beds riser tube to carbon dioxide separator, CO
2Separate CO with CaO
2Get rid of and capture by the carbon dioxide separator outlet; CaO enters the gasifier bed riser tube then by tremie pipe to the first overflow groove, and with the H that enters in the gasifier bed riser tube
2And remaining CO
2Mixed lifting; In the process that promotes, remaining CO
2Absorbed CO by CaO
2Obtain solidifying, the gas of gasifier bed riser tube internal upper part only is H
2Part H
2And CaO comes back to gasifier bed riser tube bottom, another part H through the hydrogen gas recycle pipe
2And CaO is through hydrogen gas segregator, H
2Separate with CaO, the hydrogen gas segregator outlet promptly obtains purified H
2CaO comes back to the mixing gasifying reaction chamber through tremie pipe and returning charge groove, and CaO finishes a circulation, and total amount remains unchanged; Coal has obtained purified hydrogen through steam gasification, and realizes CO
2Separation.
Device technique scheme of the present invention is as follows:
A kind ofly be used for above-mentioned coal gasification for preparing hydrogen and capture CO
2The device of method, form by gasification reaction fluidized-bed, calcium oxide regenerative response fluidized-bed.The gasification reaction fluidized-bed is made up of mixing gasifying reaction chamber, gasification reactor chamber transition section, gasifier bed riser tube, hydrogen gas recycle pipe, hydrogen gas segregator, tremie pipe, returning charge groove and material feeder.The lower end of gasifier bed riser tube links to each other with the mixing gasifying reaction chamber by mixing gasifying reaction chamber transition section, the upper end of gasifier bed riser tube links to each other with the upper end of the upper end of hydrogen gas segregator and hydrogen gas recycle pipe, the lower end of hydrogen gas recycle pipe links to each other with the lower end of gasifier bed riser tube, the lower end of hydrogen gas segregator links to each other with the returning charge groove by tremie pipe, the returning charge groove links to each other with the mixing gasifying reaction chamber, and the mixing gasifying reaction chamber links to each other with material feeder.Calcium oxide regenerative response fluidized-bed is made up of calcium oxide regenerative response chamber, regenerative response chamber transition section, Regenerative beds riser tube, carbon dioxide separator, tremie pipe, first overflow groove and second overflow groove.The lower end of Regenerative beds riser tube links to each other with calcium oxide regenerative response chamber by regenerative response chamber transition section, the upper end of Regenerative beds riser tube links to each other with carbon dioxide separator, the lower end of carbon dioxide separator links to each other with first overflow groove by tremie pipe, and first overflow groove links to each other with gasifier bed riser tube lower end side; The mixing gasifying reaction chamber links to each other with calcium oxide regenerative response chamber by second overflow groove.Coal and calcium oxide are by the material feeder supply; Be provided with water vapour mouth and slag-drip opening in mixing gasifying reaction chamber lower end; The bottom of first overflow groove, second overflow groove and returning charge groove is equipped with loosening air port.
Compared with prior art, the present invention has following advantage:
(1), method of the present invention and device thereof can separation of C O when using coal to produce hydrogen
2, realize CO
2Capture.At the gasification reaction fluidized-bed, the cross-sectional area of mixing gasifying reaction chamber is greater than the cross-sectional area of gasifier bed riser tube.In the mixing gasifying reaction chamber, material is in the bubbling fluidization state, and the dwindling to make in the gasifier bed riser tube of bed body cross-sectional area is in fast fluidized regime.It is advantageous that solid materials coal and CaO enter the mixing gasifying reaction chamber by material feeder and returning charge groove respectively, are in the bubbling fluidization state in the mixing gasifying reaction chamber, the solid materials residence time is long, and sufficient chemical time is arranged.Coal generates H through pyrolytic gasification
2, CO and CO
2CO and water vapour generation transformationreation
, this reaction is a reversible, but CO
2Because existing, CaO is absorbed and is cured as CaCO
3Like this, the reacting condition balance is moved, the continuous and water vapour reaction generation CO of CO
2And be cured as CaCO thereupon
3CaO after the regeneration enters gasifier bed riser tube lower end through first overflow groove, because the flow velocity height of gas in the gasifier bed riser tube, the effect of carrying secretly significantly, the CaO after most of regeneration can not directly fall into the mixing gasifying reaction chamber, but at first in the gasifier bed riser tube with H
2And remaining CO
2Fluidisation promotes.In lifting process, remaining CO
2Absorbed by CaO, through separating, the hydrogen gas segregator outlet obtains H at last
2, reached the pure H of acquisition
2Purpose.Utilize the ASPEN software simulation to calculate proof, when 670 ℃ of mixing gasifying reaction chamber temperatures, pressure is 30bar, calcium carbon mol ratio 1.5, and when water vapour and carbon mol ratio 2.5, H in the gaseous product that the mixing gasifying reaction chamber obtains
2Percentage composition can reach 91%, CO and CO
2Content less than 0.75%, remaining gas is a methane.On single testing table of small-sized fluidized bed, 750 ℃ of temperature of reaction, normal pressure, Ca/C mol ratio 1.0, burnt 1.5g, during water vapour flow 4.8L/min, H in the exit gas
2Ratio reach 64.2%, CO
2Be 28.3%, CO is 5.6%, and remaining gas is CH
4
In the mixing gasifying reaction chamber, CaCO
3Enter calcium oxide regenerative response chamber, coke and O with not vaporized coke after the pyrolysis through second overflow groove
2Burning, burning produces high temperature and makes CaCO
3Be decomposed into CaO and CO
2, CaO obtains regeneration; CaO and CO
2Enter the Regenerative beds riser tube, through CO
2Separator separates, and traps purified CO
2, CaO reenters the gasification reaction fluidized bed circulation and uses.With the technology of traditional coal gasification for preparing hydrogen relatively, the present invention is not having to have realized H on the basis of other extra energy consumption
2Produce and CO
2Capture.
(2), the preceding section H of hydrogen gas recycle pipe bypass hydrogen gas segregator is set
2And CaO, make H
2Come back to the gasifier bed riser tube with CaO and promote, increased the flow velocity of gasifier bed riser tube on the one hand, improved the load-carrying capacity of gasifier bed riser tube; On the other hand, increased the quantity of CaO in riser tube, strengthened CO
2Receptivity.
(3), the CO of classics in traditional coal gasification course
2Capture method is the MDEA absorption method, and MDEA absorption method main drawback is the complex manufacturing of amine absorber, and is with high costs; Amine absorber is poisonous simultaneously, and it can produce harm to operator's health inevitably in production and use, and environment is caused secondary pollution; The present invention uses CaO as CO
2Absorption agent, CaO be by the natural limestone manufacturing, produces easyly, and Wingdale and CaO are all harmless, the non-secondary pollution problem, and in system and device, can recycle, the complete assembly system operation cost is cheap.
Description of drawings
Fig. 1 is for the present invention is based on coal gasification for preparing hydrogen and separation of C O
2Setting drawing.
Embodiment
A kind of based on coal gasification for preparing hydrogen and separation of C O
2Method, coal dust is added among the mixing gasifying reaction chamber 2-8 by material feeder 2-7, feed water vapour at the lower end of mixing gasifying reaction chamber G, the temperature of mixing gasifying reaction chamber 2-8 is controlled at about 650 ℃.Coal forms coke through after the pyrolysis, and coke and the reaction of water vapour generating gasification generate H
2, CO and CO
2, CO wherein
2Absorbed generation CaCO by CaO
3, because CO
2Can be absorbed by CaO and solidify transformationreation
Balance move right, CO constantly is converted into CO by this reaction
2, CO
2Absorbed by CaO thereupon and solidify; The gas that leaves mixing gasifying reaction chamber 2-8 is H
2And remaining CO
2, it enters gasifier bed riser tube 2-2 through gasification reactor chamber transition section 2-5.The CaCO that generates among the mixing gasifying reaction chamber 2-8
3Enter calcium oxide regenerative response chamber 1-1 with coke by the second overflow groove 1-7, the second overflow groove lower end D adopts O
2As loosening wind.Feed pure oxygen at calcium oxide regenerative response chamber lower end A, enter coke and the oxygen combustion of calcium oxide regenerative response chamber 1-1, the heat of release makes the interior temperature controlling of calcium oxide regenerative response chamber 1-1 about 950 ℃, CaCO
3Decompose, be generated as CaO and CO
2, CaO obtains regeneration.CaO and CO
2Process Regenerative beds riser tube 1-3 is to carbon dioxide separator 1-6, CO
2Separate CO with CaO
2B captures by the carbon dioxide separator outlet, and CaO is by tremie pipe 1-5 to the first overflow groove 1-4, and the first isopipe root C adopts CO
2As loosening wind, enter gasifier bed riser tube 2-2 then, and with the H that enters among the gasifier bed riser tube 2-2
2And remaining CO
2Mixed lifting; CO in the process that promotes
2Absorbed by CaO, generate CaCO
3, CO
2Obtaining solidifying, only is H at the gas of gasifier bed riser tube 2-2 internal upper part
2, a part of H
2And CaO gets back to gasifier bed riser tube 2-2 bottom, lifting again through hydrogen gas recycle pipe 2-3; Another part H
2And CaO is through hydrogen cyclonic separator 2-1, H
2Separate with CaO, hydrogen gas segregator outlet E promptly obtains purified H
2CaO comes back among the mixing gasifying reaction chamber 2-8 through tremie pipe 2-4 and returning charge groove 2-6, and returning charge trench bottom F adopts water vapour as loosening wind, and CaO finishes a circulation, and total amount remains unchanged; Coal obtains purified hydrogen through steam gasification, and realizes CO
2Separation; As accompanying drawing 1
A kind ofly be used to realize that claim 1 is described based on coal gasification for preparing hydrogen and separation of C O
2Device, form by gasification reaction fluidized-bed 2, calcium oxide regenerative response fluidized-bed 1.Gasification reaction fluidized-bed 2 is made up of mixing gasifying reaction chamber 2-8, gasification reactor chamber transition section 2-5, gasifier bed riser tube 2-2, hydrogen gas recycle pipe 2-3, hydrogen gas segregator 2-1, tremie pipe 2-4, returning charge groove 2-6 and material feeder 2-7.The lower end of gasifier bed riser tube 2-2 links to each other with mixing gasifying reaction chamber 2-8 by mixing gasifying reaction chamber transition section 2-5, the upper end of gasifier bed riser tube 2-2 links to each other with the upper end of the upper end of hydrogen gas segregator 2-1 and hydrogen gas recycle pipe 2-3, the lower end of hydrogen gas recycle pipe 2-3 links to each other with the lower end of gasifier bed riser tube 2-2, the lower end of hydrogen gas segregator 2-1 links to each other with returning charge groove 2-6 by tremie pipe 2-4, returning charge groove 2-6 links to each other with mixing gasifying reaction chamber 2-8, and mixing gasifying reaction chamber 2-8 links to each other with material feeder 2-7.Calcium oxide regenerative response fluidized-bed 1 is made up of calcium oxide regenerative response chamber 1-1, regenerative response chamber transition section 1-2, Regenerative beds riser tube 1-3, carbon dioxide separator 1-6, tremie pipe 1-5, the first overflow groove 1-4 and the second overflow groove 1-7.The lower end of Regenerative beds riser tube 1-3 links to each other with calcium oxide regenerative response chamber 1-1 by regenerative response chamber transition section 1-2, the upper end of Regenerative beds riser tube 1-3 links to each other with carbon dioxide separator 1-6, the lower end of carbon dioxide separator 1-6 links to each other with the first overflow groove 1-4 by tremie pipe 1-5, and the first overflow groove 1-4 links to each other with gasifier bed riser tube 2-2 lower end side; Mixing gasifying reaction chamber 2-8 links to each other with calcium oxide regenerative response chamber 1-1 by the second overflow groove 1-7.Coal and calcium oxide are by material feeder 2-7 supply; Be provided with water vapour mouth G and slag-drip opening H in mixing gasifying reaction chamber 2-8 lower end; The bottom of the first overflow groove 1-4, the second overflow groove 1-7 and returning charge groove 2-6 is equipped with loosening air port; As accompanying drawing 1.
Claims (3)
1. one kind based on coal gasification for preparing hydrogen and separation of C O
2Method, it is characterized in that: coal is added mixing gasifying reaction chamber (2-8), feed water vapour, be in the bubbling fluidized bed state in the mixing gasifying reaction chamber (2-8) in mixing gasifying reaction chamber bottom (G); Coal generates coke through pyrolysis, and coke and the reaction of water vapour generating gasification obtain H
2, CO and CO
2Gas mixture; CO is converted to CO by transformationreation
2, CO
2Absorbed by CaO, be cured as CaCO from returning charge groove (2-6)
3H
2With remaining CO
2Enter gasifier bed riser tube (2-2) through gasification reactor chamber transition section (2-5); CaCO
3Leave mixing gasifying reaction chamber (2-8) with coke, enter calcium oxide regenerative response chamber (1-1) through second overflow groove (1-7); Feed pure oxygen, coke and oxygen combustion, CaCO in lower end, calcium oxide regenerative response chamber (A)
3Again be decomposed into CO
2With CaO, CO
2Arrive carbon dioxide separator (1-6), CO with CaO through Regenerative beds riser tube (1-3)
2Separate CO with CaO
2Get rid of and capture from carbon dioxide separator (1-6) upper end outlet, CaO from carbon dioxide separator (1-6) lower end through tremie pipe (1-5), first overflow groove (1-4) to gasifier bed riser tube (2-2) bottom; The cross-sectional area of gasifier bed riser tube (2-2) is less than the cross-sectional area of mixing gasifying reaction chamber (2-8), and the material in the gasifier bed riser tube (2-2) is in fast fluidized regime, and CaO is by the gas H from mixing gasifying reaction chamber (2-8)
2And remaining CO
2Promote, and the remaining CO in the absorption gas
2, the gas that leaves gasifier bed riser tube (2-2) only is H
2Part H
2And CaO comes back to gasifier bed riser tube (2-2) bottom, another part H through hydrogen gas recycle pipe (2-3)
2And CaO is through hydrogen gas segregator (2-1), H
2Separate from hydrogen gas segregator (2-1) upper end; CaO comes back to mixing gasifying reaction chamber (2-8) through tremie pipe (2-4), returning charge groove (2-6), and CaO realizes recycle.
2. realize described coal gasification for preparing hydrogen of claim 1 and separation of C O for one kind
2The device of method, it is characterized in that, form by gasification reaction fluidized-bed (2) and calcium oxide regenerative response fluidized-bed (1); Gasification reaction fluidized-bed (2) is made up of mixing gasifying reaction chamber (2-8), gasification reactor chamber transition section (2-5), gasifier bed riser tube (2-2), hydrogen gas segregator (2-1), hydrogen gas recycle pipe (2-3), tremie pipe (2-4), returning charge groove (2-6) and material feeder (2-7); The lower end of gasifier bed riser tube (2-2) links to each other with mixing gasifying reaction chamber (2-8) by gasifying reactor transition section (2-5), the upper end of gasifier bed riser tube (2-2) links to each other with the upper end of hydrogen gas segregator (2-1) and the upper end of hydrogen gas recycle pipe (2-3), the lower end of hydrogen gas segregator (2-1) links to each other with returning charge groove (2-6) by tremie pipe (2-4), returning charge groove (2-6) links to each other with mixing gasifying reaction chamber (2-8) upper end side, and the lower end side of mixing gasifying reaction chamber (2-8) links to each other with material feeder (2-7); Calcium oxide regenerative response fluidized-bed (1) is by calcium oxide regenerative response chamber (1-1), regenerative response chamber transition section (1-2), Regenerative beds riser tube (1-3), carbon dioxide separator (1-6), tremie pipe (1-5), first overflow groove (1-4) and second overflow groove (1-7) are formed, the lower end of Regenerative beds riser tube (1-3) links to each other with calcium oxide regenerative response chamber (1-1) by regenerative response chamber transition section (1-2), the upper end of regenerative response bed riser tube (1-3) links to each other with carbon dioxide separator (1-6), the lower end of carbon dioxide separator (1-6) links to each other with first chute (1-4) by tremie pipe (1-5), first overflow groove (1-4) links to each other with gasifier bed riser tube (2-2) lower end side, and mixing gasifying reaction chamber (2-8) links to each other with regenerative response chamber (1-1) by second overflow groove (1-7); Be provided with water vapour mouth (G) and slag-drip opening (H) in mixing gasifying reaction chamber (2-8) bottom of gasification reaction fluidized-bed (2); The bottom (F) of the bottom (C) of first overflow groove (1-4), the bottom (D) of second overflow groove (1-7) and returning charge groove (2-6) is respectively equipped with loosening air port.
3. device according to claim 2, the loosening wind that it is characterized in that feeding the bottom (F) of the bottom (D) of bottom (C), second overflow groove (1-7) of first overflow groove (1-4) and returning charge groove adopts CO respectively
2, O
2With water vapour.
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|---|---|---|---|
| CN2010101725221A CN101830432B (en) | 2010-05-14 | 2010-05-14 | Method and device based on coal gasification for preparing hydrogen and separating CO2 |
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|---|---|---|---|
| CN2010101725221A CN101830432B (en) | 2010-05-14 | 2010-05-14 | Method and device based on coal gasification for preparing hydrogen and separating CO2 |
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| Publication Number | Publication Date |
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| CN101830432A true CN101830432A (en) | 2010-09-15 |
| CN101830432B CN101830432B (en) | 2012-05-23 |
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| CN102200277A (en) * | 2011-04-27 | 2011-09-28 | 东南大学 | Chemical chain combustion method and device through solid fuel |
| CN102219183A (en) * | 2011-04-27 | 2011-10-19 | 东南大学 | Double-circulation chained combustion hydrogen heat coproduction and CO2 separating method and device thereof |
| CN102977927A (en) * | 2012-11-07 | 2013-03-20 | 东南大学 | Apparatus for preparing synthesis gas based on dual fluidized bed biomass gasification and preparation method thereof |
| CN103060003A (en) * | 2012-12-27 | 2013-04-24 | 东南大学 | Method and device for preparing H2 and separating CO2 based on calcium-based sorbent |
| CN104053754A (en) * | 2011-11-21 | 2014-09-17 | 苏伊士环能集团 | Biomethane Production Method |
| CN104803819A (en) * | 2015-05-15 | 2015-07-29 | 北京神雾环境能源科技集团股份有限公司 | Method and system for producing ethylene by utilizing pulverized coal |
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| CN102200277B (en) * | 2011-04-27 | 2013-01-30 | 东南大学 | Chemical chain combustion method and device through solid fuel |
| CN102200277A (en) * | 2011-04-27 | 2011-09-28 | 东南大学 | Chemical chain combustion method and device through solid fuel |
| CN102219183B (en) * | 2011-04-27 | 2013-04-03 | 东南大学 | Double-circulation chained combustion hydrogen heat coproduction and CO2 separating method and device thereof |
| CN104053754A (en) * | 2011-11-21 | 2014-09-17 | 苏伊士环能集团 | Biomethane Production Method |
| CN102977927A (en) * | 2012-11-07 | 2013-03-20 | 东南大学 | Apparatus for preparing synthesis gas based on dual fluidized bed biomass gasification and preparation method thereof |
| CN103060003A (en) * | 2012-12-27 | 2013-04-24 | 东南大学 | Method and device for preparing H2 and separating CO2 based on calcium-based sorbent |
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