CN101113670B - Coal underground gasifying technology - Google Patents
Coal underground gasifying technology Download PDFInfo
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- CN101113670B CN101113670B CN2007101458784A CN200710145878A CN101113670B CN 101113670 B CN101113670 B CN 101113670B CN 2007101458784 A CN2007101458784 A CN 2007101458784A CN 200710145878 A CN200710145878 A CN 200710145878A CN 101113670 B CN101113670 B CN 101113670B
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Abstract
The invention discloses an underground gasification technique for coal and is divided into the following steps: (1) a plurality of vertical shafts and connection passages thereof are arranged; (2) the vertical shafts are selected respectively as a gas intake shaft and a gas outtake shaft and the coal bed under the gas intake shaft is burnt to form an underground gasification furnace; (3) CO2 is recycled and is mixed with oxygen and then sent to the gasification furnace; the proportion of oxygen is adjusted to control the temperature in the burning area between 600 DEG C and 1300 DEG C; (4) when the combustion space area is formed, O2, CO, H2 and CH4 attached to the combustion space area are replaced by CO2 and at the same time reducing reaction happens between CO2 and residue carbon; (5) thereafter, when the combustion space area is formed completely between the gas intake shaft and an adjacent vertical shaft, the adjacent vertical shaft is taken as a secondary gas intake shaft to go through by mixed gas and settle CO2 in the combustion area. After a new combustion area is completely formed between the secondary gas intake shaft and the adjacent vertical shaft, the adjacent vertical shaft is taken as a third gas intake shaft to go through by mixed gas to replace O2, CO, H2 and CH4 in the combustion space area and settle CO2. The process is recycled for the rest adjacent vertical shafts. The technique can not only reduce the discharge of CO2 but also reduce energy consumption, so as to improve resource using rate.
Description
Technical field
The present invention relates to a kind of coal underground gasifying technology.
Background technology
Coal gasification mainly is meant coal or solid fuels such as coke, semicoke, under high-temperature pressure or pressurized conditions, with the gasifying agent reaction, is converted into the process of gaseous product and a small amount of residue.Gasifying agent mainly is steam, air (or oxygen) or their gaseous mixture.Coal gasification course can be used for producing fuel gas, as industrial kiln gas and town gas, also is used to make synthesis gas, and as the raw material of synthetic ammonia, synthesizing methanol and synthetic liquid fuel, coal gasification is one of important technology of Coal Chemical Industry.
Coal gasification process can be divided into ground evaporating method and underground gasification method in the prior art.
Coal ground evaporating method is realized by gasification furnace on ground.Press the motion mode of coal in gasification furnace, gasification process can be divided into three classes, i.e. fixed bed (moving bed) evaporating method, thermopnore (ebullated bed) evaporating method and entrained flow gasification method.
Underground coal gasification(UCG) is the mode by tunnelling or boring driving, in natural coal seam, arrange air inlet/outlet, gas channel, gasification zone, isolated area and drainage gallery etc., and finally form underground gasification furnace (is the Chinese patent literature of CN 1854459A referring to publication number), then gasifying agent is fed in the coal seam, light the coal seam then and control the gasification mode of coal and gasifying agent course of reaction in the coal seam.
Compare with the ground gasification, the underground gasification method is an one with multinomial link collection such as the underground lifting of coal mining, tunnelling, coal and ground storage, washing, transportations, in with coal mining and the effective combination of clean utilization, having the characteristics of efficient, environmental protection, safety, is a kind of coal gasification with extensive prospect therefore.
The basic chemical reaction of underground coal gasification(UCG) and ground gasification is identical, and its process is with the coal priority in gasifying agent such as oxygen and the gasification furnace (ground or underground) or reactions such as oxidizing fire, reduction, conversion, methanation take place simultaneously briefly.The fundamental reaction equation is:
C+O
2→CO
2 (1)
CO
2+C→2CO (2)
H
2O+C→H
2+CO (3)
C+2H
2→CH
4 (4)
CO+H
2O→CO
2+H
2 (5)
2C+O
2→2CO (6)
2CO+O
2→2CO
2 (7)
C+2H
2O(g)→CO
2+2H
2 (8)
2H
2+O
2＝2H
2O+484 (9)
2C+2H
2O＝CH
4+CO
2 (10)
CO+3H
2→CH
4+H
2O+206.4 (11)
2CO+2H
2→CH
4+CO
2+247.4 (12)
CO
2+4H
2→CH
4+2H
2O+165.4 (13)
Wherein (2), (3), (8) are the endothermic reaction, and all the other are exothermic reaction.(1)-(9) be key reaction, (10)-(13) are assisted reaction.The component of the product gas that coal gasification generates is CO, H
2, CH
4Comprise CO with other components
2Deng gas, this product gas can be applicable to the urban gas supply and Coal Chemical Industry is synthetic.
Chemical reaction from above-mentioned coal gasification course contains a large amount of CO as can be seen in the coal gasification product
2, and along with the extensive use of coal gasification, the CO of generation
2To get more and more CO
2As a kind of well-known greenhouse gases, if with the CO that produces in the underground coal gasification(UCG) process
2All be discharged in the atmosphere, will further aggravate global greenhouse effect.Therefore, in carrying out the underground coal gasification(UCG) process, how effectively to utilize and to reclaim CO
2, reduce the important topic that its discharge value becomes people research.
Summary of the invention
Problem at prior art exists the purpose of this invention is to provide a kind of new coal underground gasifying technology, and this technology is by making CO
2The underground gasification that participates in coal reacts, replaces the adsorbed O of residue (comprising residual coal, semicoke and residue after gasifying) that gasifies in the underground coal gasification combustion space area
2, CO, H
2And CH
4Gas, and reclaim the residual coal in the combustion dead zone, carbon resource and the heat in the semicoke effectively, and carry out sedimentation firing the dead zone, realized CO in the underground coal gasification(UCG) process
2Reduction of discharging even zero-emission.
For achieving the above object, technical scheme of the present invention is:
(1) several is set at interval and is drilled into the vertical shaft of subterranean coal, in subterranean coal, excavate the interface channel that is communicated with each vertical shaft successively by ground;
(2) at first, the vertical shaft that will be positioned at interface channel one end selects other arbitrary vertical shafts as going out gas well as the first air inlet well, seals all the other vertical shafts; Then,, light the coal seam of the first air inlet down-hole, make that the carbon in oxygen and the underground combustion district reacts to first air inlet well input oxygen or air:
C+O
2→CO
2+393kj/mol
2C+O
2→2CO+231.4kj/mol
Temperature until the subterranean coal combustion zone rises to more than 600 ℃, forms to light from the first air inlet Jing Chu, fires into underground gasification furnace along interface channel to going out the gas well direction;
(3) reclaim the CO that underground gasification furnace produces from going out gas well
2, with itself and oxygen mix, CO in the control gaseous mixture
2Volume ratio be 0-60%, and gaseous mixture is input to underground gasification furnace as gasifying agent by the first air inlet well, by regulating O in the gasifying agent
2Ratio the temperature of combustion zone is controlled in 600 ℃ of-1300 ℃ of scopes, in the combustion zone, CO
2With carbon generation reduction reaction:
CO
2+C→2CO
(4) in underground gasification furnace sustained combustion a period of time and after the combustion dead zone occurring,, progressively improve CO in the gaseous mixture that is input to the first air inlet well along with the progressively expansion of combustion dead zone
2Concentration, utilize the CO in the gaseous mixture
2Displace the adsorbed O of combustion dead zone gasification residue
2, CO, H
2And CH
4, utilize the waste heat of combustion dead zone to make CO simultaneously
2Carry out reduction reaction with the residual carbon in the combustion dead zone:
CO
2+C→2CO
(5) treat the first air inlet well and No. second vertical shaft being adjacent between the coal seam be completed into the combustion dead zone after, open vertical shaft No. second, it is imported hybrid gasification agent as the second air inlet well to underground gasification furnace, and same other arbitrary vertical shafts of selecting to be positioned at the gasification furnace opposite side are as going out gas well, seal all the other vertical shafts of this side, will import the CO in the gaseous mixture of the first air inlet well simultaneously
2Ratio be increased to 100%, continue to utilize CO
2Displace the adsorbed O of combustion dead zone gasification residue
2, CO, H
2And CH
4, and utilize CO
2The characteristics that proportion is bigger, sedimentation CO in the combustion dead zone
2
(6) treat the second air inlet well and No. three vertical shaft being adjacent between the coal seam be completed into new combustion dead zone after, seal the first air inlet well, meanwhile, open vertical shaft No. three, it is imported hybrid gasification agent as the 3rd air inlet well to underground gasification furnace, same other arbitrary vertical shafts of selecting to be positioned at the gasification furnace opposite side are as going out gas well, seal all the other vertical shafts of this side, and will import the CO in the gaseous mixture of the second air inlet well
2Ratio be increased to 100%, continue to utilize CO
2Displacement makes new advances and fires the adsorbed O of dead zone gasification residue
2, CO, H
2And CH
4, and in new combustion dead zone sedimentation CO
2So circulation enter the interface channel other end until the underground gasification furnace combustion, and gasification finishes.
Another technical scheme that realizes the object of the invention is:
(1) several is set at interval and is drilled into the vertical shaft of subterranean coal, in subterranean coal, excavate the interface channel that is communicated with each vertical shaft successively by ground;
(2) at first, arbitrary vertical shaft that will be positioned at the interface channel middle part is as the first air inlet well, and any two vertical shafts of selecting the first air inlet well both sides seal all the other vertical shafts as going out gas well; Then,, light the coal seam of the first air inlet down-hole, make that the carbon in oxygen and the underground combustion district reacts to first air inlet well input oxygen or air:
C+O
2→CO
2+393kj/mol
2C+O
2→2CO+231.4kj/mol
Temperature until the subterranean coal combustion zone rises to more than 600 ℃, forms to light from the first air inlet Jing Chu, goes out the gas well direction to both sides respectively along interface channel and fires into two underground gasification furnaces;
(3) reclaim the CO that underground gasification furnace produces from going out gas well
2, with itself and oxygen mix, CO in the control gaseous mixture
2Volume ratio be 0-60%, and gaseous mixture is input to underground gasification furnace as gasifying agent by the first air inlet well, by regulating O in the gasifying agent
2Ratio the temperature of combustion zone is controlled in 600 ℃ of-1300 ℃ of scopes, in the combustion zone, CO
2With carbon generation reduction reaction:
CO
2+C→2CO
(4) in two underground gasification furnace sustained combustion a period of times and after two combustion dead zones occurring,, progressively improve CO in the gaseous mixture that is input to the first air inlet well along with the progressively expansion of combustion dead zone
2Concentration, utilize the CO in the gaseous mixture
2Displace the adsorbed O of two combustion dead zone gasification residues
2, CO, H
2And CH
4, utilize the waste heat of two combustion dead zones to make CO simultaneously
2Carry out reduction reaction with the residual carbon in the combustion dead zone:
CO
2+C→2CO
(5) treat that two underground gasification furnaces combustions enters two adjacent vertical shaft places of the first air inlet well both sides and after the rear is completed into the combustion dead zone separately, open two adjacent vertical shafts of the first air inlet well both sides, this two vertical shaft is imported hybrid gasification agent as the second air inlet well to two underground gasification furnaces, and select the arbitrary vertical shafts of other of each gasification furnace opposite side as going out gas well, seal all the other vertical shafts of this side, will import the CO in the gaseous mixture of the first air inlet well simultaneously
2Ratio be increased to 100%, continue to utilize CO
2Displace the adsorbed O of combustion dead zone gasification residue
2, CO, H
2And CH
4, and utilize CO
2The characteristics that proportion is bigger, sedimentation CO in the combustion dead zone
2
(6) treat that two underground gasification furnaces combustions enters two new vertical shaft places and after the rear forms two new combustion dead zones once more separately, open this two new vertical shafts, it is imported hybrid gasification agent as two the 3rd air inlet wells to two underground gasification furnaces, seal the first air inlet well, and same other arbitrary vertical shafts of selecting to be positioned at two gasification furnace opposite sides are as all the other vertical shafts that go out gas well and seal this side, and will import the CO in the gaseous mixture of the second air inlet well
2Ratio be increased to 100%, continue to utilize CO
2Displacement makes new advances and fires the adsorbed O of dead zone gasification residue
2, CO, H
2And CH
4, and in new combustion dead zone sedimentation CO
2So circulation is fired respectively until two underground gasification furnaces and to be entered the interface channel two ends, and gasification finishes.
Further, O in the gasifying agent described in above-mentioned two technical scheme steps (3)
2Shared volume ratio is 40-100%.
In coal underground gasifying technology of the present invention, at first utilize the waste heat behind the coal burning to make CO
2Carry out reduction reaction with the coal residue and the semicoke of combustion dead zone, utilize the combustion dead zone then CO
2Adsorptivity be better than the characteristic of other gases, the CO that gasification is produced
2Adsorb, and displace the O of original absorption simultaneously
2, CO, H
2And CH
4Deng gas, last, utilize CO
2The characteristics that proportion is bigger, the combustion dead zone in to CO
2Carry out sedimentation and store, therefore, gasifying process of the present invention not only can reduce CO widely
2Discharge value, even realize zero-emission, and reduced energy consumption, improved resource utilization.
Description of drawings
Accompanying drawing is a process flow diagram of the present invention.
The specific embodiment
The present invention is described in detail below in conjunction with accompanying drawing.
As shown in drawings, when implementing coal underground gasifying technology of the present invention,, be provided with 9 at interval and be drilled into the vertical shaft of subterranean coal, and in subterranean coal, excavate the interface channel that is communicated with each vertical shaft successively by ground at first according to the scope in the coal seam that will gasify; No. 1 vertical shaft that will be positioned at the interface channel two ends then goes out gas well as air inlet well, No. 9 vertical shafts conducts, and sealing 2-8 vertical shaft is lighted the coal seam under the vertical shaft No. 1, and to air inlet well input oxygen or air, makes that the carbon in oxygen and the underground combustion district reacts:
C+O
2→CO
2+393kj/mol
2C+O
2→2CO+231.4kj/mol
Temperature until the subterranean coal combustion zone rises to more than 600 ℃, and forms underground gasification furnace.
Reclaim the gaseous mixture that underground gasification furnace produces from going out gas well subsequently, therefrom isolate CO
2Gas and with itself and O
2Mix CO in the control gaseous mixture
2Volume ratio be 0-60%, with CO
2With O
2Mixed gas is input to underground gasification furnace as gasifying agent by No. 1 well, regulates O in the gasifying agent
2Ratio the temperature of combustion zone is controlled in 600 ℃ of-1300 ℃ of scopes, in the combustion zone, CO
2With carbon generation reduction reaction: CO
2+ C → 2CO.Wherein, with CO
2The gas that mixes can be pure oxygen, also can be air, or other contains the mist of oxygen.
In underground gasification furnace continuous firing a period of time, the combustion dead zone appears between No. 1 well and No. 2 wells and after, along with the progressively expansion of combustion dead zone, progressively improve CO in the gasifying agent that is input to No. 1 well
2Concentration, utilize the CO in the gasifying agent
2Displace the adsorbed O of combustion dead zone residue
2, CO, H
2And CH
4, utilize the waste heat of combustion dead zone to make CO simultaneously
2Carry out reduction reaction: CO with the coal residue and the semicoke that do not burn in the combustion dead zone
2+ C → 2CO.
After treating that coal seam between No. 1 well and No. 2 wells is completed into the combustion dead zone, open well No. 2, import gasifying agent to underground gasification furnace, will import the CO in the gaseous mixture of No. 1 well simultaneously by No. 2 wells
2Ratio be increased to 100%, continue to utilize CO
2Displace the adsorbed O of combustion dead zone residue
2, CO, H
2And CH
4, and utilize CO
2The characteristics that proportion is bigger, sedimentation stores CO in the combustion dead zone
2
After treating that coal seam between No. 2 gas wells and No. 3 wells is completed into new combustion dead zone, seal No. 1 well, open well No. 3, import gasifying agent to underground gasification furnace, will import the CO in the gaseous mixture of No. 2 wells simultaneously by No. 3 wells
2Ratio be increased to 100%, continue to utilize CO
2Displacement makes new advances and fires the adsorbed O in dead zone
2, CO, H
2And CH
4, and sedimentation stores CO in new combustion dead zone
2So circulation is advanced to out gas well until underground gasification furnace, and gasification finishes.For fear of from the gas backwash of No. 2 wells input to No. 1 well, influence CO
2Sedimentation store, open No. 3 wells and with its as the air inlet well after, can gradually reduce CO to No. 1 well input
2Amount, until closing well No. 1.
Owing to have unburnt residual coal, semicoke in the combustion dead zone of underground gasification furnace process, and residues such as residual coal, semicoke, residue after gasifying still are in higher state of temperature, utilize the CO in the gasifying agent like this
2React with these residual coals and semicoke, both made this part unburnt residual carbon obtain gasification, made full use of the waste heat of combustion dead zone again.Because of the unburnt residual coal in combustion dead zone, semicoke and residue after gasifying belong to loose structure, wherein be adsorbed with O
2, CO, H
2And CH
4, these compositions all belong to active principle concerning underground gasification, and loose structure is to CO
2Adsorption capacity be higher than O
2, CO, H
2And CH
4Adsorption capacity, to combustion dead zone input CO
2Can cement out these active principles.CO in addition
2Proportion is bigger, is utilizing CO
2When carrying out reduction reaction and other gases of displacement, also can be with CO
2Sedimentation is stored in the combustion dead zone.Through after the above-mentioned processing, along with CO
2Be adsorbed, participate in reduction reaction and sedimentation, can significantly reduce its discharge value, even realize not discharging.
In coal gasification processes, it is necessary making underground gasification furnace keep sufficiently high temperature, if but the too high meeting of temperature causes ash content to melt, and the ash content after melting can be surrounded unreacted coal, stop the smooth gasification of deep layer coal, cause the waste of coal resources and the reduction of conversion ratio.By adjusting O in the gasifying agent
2Ratio, the reaction temperature of underground gasification furnace is controlled in 600 ℃-1300 ℃ the scope, can avoid the fusion of lime-ash, guarantee carrying out smoothly of underground coal gasification(UCG).
Experimental results show that, in the underground coal gasification(UCG) process, when the shared volume ratio of oxygen in the gasifying agent is 40-80%, the product best results of being produced, when the effective volume of oxygen changes than between 80-100%, the increase of oxygen content reduces the speed that influences that final gasification product active principle increases, and therefore the oxygen content in the gasifying agent is controlled at 40-80%, can realize the cost effectiveness of underground coal gasification(UCG) process the best.
In the above-described embodiments, be to carry out gasifying underground coal as the mode that goes out gas well with No. 9 vertical shafts that are positioned at an end, in addition, when No. 1 vertical shaft carries out the gasifying underground coal operation as starting point, also can select to be positioned at underground gasification furnace and fire arbitrary vertical shaft of direction one side into as going out gas well, as No. 1 vertical shaft during as the air inlet well, can select No. 2 vertical shafts as going out gas well, after treating that gasification furnace combustion enters No. 2 vertical shafts, open No. 3 vertical shafts again as going out gas well, by that analogy, enter vertical shaft No. 9 until the gasification furnace combustion, and gasification finishes, and in above-mentioned gasification, keeps other operation constant.
In order to boost productivity, one of 2-8 vertical shaft carries out the gasification operation of underground coal as starting point in the middle of also can selecting.As select No. 4 vertical shafts to carry out well as first, select one of 1-3 vertical shaft to go out gas well as a side, select one of 5-9 vertical shaft to go out gas well again as opposite side, seal other vertical shafts, input oxygen or air in the air inlet well, light the coal seam under the vertical shaft No. 4, make No. 4 vertical shafts form two down and fire into gasifying underground coal stove to No. 1 vertical shaft of both sides and No. 9 vertical shafts respectively, subsequent handling is then identical with first embodiment.In addition, after selecting No. 4 vertical shafts, also can select No. 1 vertical shaft and No. 9 vertical shafts fixing to go out gas well, carry out the underground gasification operation of coal as two as the coal gasification starting point.Or the like.
Claims (4)
1. coal underground gasifying technology is specially:
(1) several is set at interval and is drilled into the vertical shaft of subterranean coal, in subterranean coal, excavate the interface channel that is communicated with each vertical shaft successively by ground;
(2) at first, the vertical shaft that will be positioned at interface channel one end selects other arbitrary vertical shafts as going out gas well as the first air inlet well, seals all the other vertical shafts; Then,, light the coal seam of the first air inlet down-hole, make that the carbon in oxygen and the underground combustion district reacts to first air inlet well input oxygen or air:
C+O
2→CO
2+393kj/mol
2C+O
2→2CO+231.4kj/mol
Temperature until the subterranean coal combustion zone rises to more than 600 ℃, forms to light from the first air inlet Jing Chu, fires into underground gasification furnace along interface channel to going out the gas well direction;
(3) reclaim the CO that underground gasification furnace produces from going out gas well
2, with itself and oxygen mix, CO in the control gaseous mixture
2Volume ratio be 0-60%, and gaseous mixture is input to underground gasification furnace as gasifying agent by the first air inlet well, by regulating O in the gasifying agent
2Ratio the temperature of combustion zone is controlled in 600 ℃ of-1300 ℃ of scopes, in the combustion zone, CO
2With carbon generation reduction reaction:
CO
2+C→2CO
(4) in underground gasification furnace sustained combustion a period of time and after the combustion dead zone occurring,, progressively improve CO in the gaseous mixture that is input to the first air inlet well along with the progressively expansion of combustion dead zone
2Concentration, utilize the CO in the gaseous mixture
2Displace the adsorbed O of combustion dead zone gasification residue
2, CO, H
2And CH
4, utilize the waste heat of combustion dead zone to make CO simultaneously
2Carry out reduction reaction with the residual carbon in the combustion dead zone:
CO
2+C→2CO
(5) treat the first air inlet well and No. second vertical shaft being adjacent between the coal seam be completed into the combustion dead zone after, open vertical shaft No. second, it is imported hybrid gasification agent as the second air inlet well to underground gasification furnace, and same other arbitrary vertical shafts of selecting to be positioned at the gasification furnace opposite side are as going out gas well, seal all the other vertical shafts of this side, will import the CO in the gaseous mixture of the first air inlet well simultaneously
2Ratio be increased to 100%, continue to utilize CO
2Displace the adsorbed O of combustion dead zone gasification residue
2, CO, H
2And CH
4, and utilize CO
2The characteristics that proportion is bigger, sedimentation CO in the combustion dead zone
2
(6) treat the second air inlet well and No. three vertical shaft being adjacent between the coal seam be completed into new combustion dead zone after, gradually reduce the CO of the first air inlet well
2Input quantity, until closing the first air inlet well, meanwhile, open vertical shaft No. three, it is imported hybrid gasification agent as the 3rd air inlet well to underground gasification furnace, same other arbitrary vertical shafts of selecting to be positioned at the gasification furnace opposite side are as going out gas well, seal all the other vertical shafts of this side, and will import the CO in the gaseous mixture of the second air inlet well
2Ratio be increased to 100%, continue to utilize CO
2Displacement makes new advances and fires the adsorbed O of dead zone gasification residue
2, CO, H
2And CH
4, and in new combustion dead zone sedimentation CO
2So circulation enter the interface channel other end until the underground gasification furnace combustion, and gasification finishes.
2. a kind of coal underground gasifying technology according to claim 1 is characterized in that, O in the gasifying agent described in the step (3)
2Shared volume ratio is 40-100%.
3. coal underground gasifying technology is specially:
(1) several is set at interval and is drilled into the vertical shaft of subterranean coal, in subterranean coal, excavate the interface channel that is communicated with each vertical shaft successively by ground;
(2) at first, arbitrary vertical shaft that will be positioned at the interface channel middle part is as the first air inlet well, and any two vertical shafts of selecting the first air inlet well both sides seal all the other vertical shafts as going out gas well; Then,, light the coal seam of the first air inlet down-hole, make that the carbon in oxygen and the underground combustion district reacts to first air inlet well input oxygen or air:
C+O
2→CO
2+393kj/mol
2C+O
2→2CO+231.4kj/mol
Temperature until the subterranean coal combustion zone rises to more than 600 ℃, forms to light from the first air inlet Jing Chu, goes out the gas well direction to both sides respectively along interface channel and fires into two underground gasification furnaces;
(3) reclaim the CO that underground gasification furnace produces from going out gas well
2, with itself and oxygen mix, CO in the control gaseous mixture
2Volume ratio be 0-60%, and gaseous mixture is input to underground gasification furnace as gasifying agent by the first air inlet well, by regulating O in the gasifying agent
2Ratio the temperature of combustion zone is controlled in 600 ℃ of-1300 ℃ of scopes, in the combustion zone, CO
2With carbon generation reduction reaction:
CO
2+C→2CO
(4) in two underground gasification furnace sustained combustion a period of times and after two combustion dead zones occurring,, progressively improve CO in the gaseous mixture that is input to the first air inlet well along with the progressively expansion of combustion dead zone
2Concentration, utilize the CO in the gaseous mixture
2Displace the adsorbed O of two combustion dead zone gasification residues
2, CO, H
2And CH
4, utilize the waste heat of two combustion dead zones to make CO simultaneously
2Carry out reduction reaction with the residual carbon in the combustion dead zone:
CO
2+C→2CO
(5) treat that two underground gasification furnaces combustions enters two adjacent vertical shaft places of the first air inlet well both sides and after the rear is completed into the combustion dead zone separately, open two adjacent vertical shafts of the first air inlet well both sides, this two vertical shaft is imported hybrid gasification agent as the second air inlet well to two underground gasification furnaces, and select the arbitrary vertical shafts of other of each gasification furnace opposite side as going out gas well, seal all the other vertical shafts of this side, will import the CO in the gaseous mixture of the first air inlet well simultaneously
2Ratio be increased to 100%, continue to utilize CO
2Displace the adsorbed O of combustion dead zone gasification residue
2, CO, H
2And CH
4, and utilize CO
2The characteristics that proportion is bigger, sedimentation CO in the combustion dead zone
2
(6) treat that two underground gasification furnaces combustions enters two new vertical shaft places and after the rear forms two new combustion dead zones once more separately, open this two new vertical shafts, it is imported hybrid gasification agent as two the 3rd air inlet wells to two underground gasification furnaces, and same other arbitrary vertical shafts of selecting to be positioned at two gasification furnace opposite sides are as all the other vertical shafts that go out gas well and seal this side, and will import the CO in the gaseous mixture of the second air inlet well
2Ratio be increased to 100%, continue to utilize CO
2Displacement makes new advances and fires the adsorbed O of dead zone gasification residue
2, CO, H
2And CH
4, and in new combustion dead zone sedimentation CO
2, meanwhile, gradually reduce the CO of the first air inlet well
2Input quantity is until closing the first air inlet well; So circulation is fired respectively until two underground gasification furnaces and to be entered the interface channel two ends, and gasification finishes.
4. a kind of coal underground gasifying technology according to claim 3 is characterized in that, O in the gasifying agent described in the step (3)
2Shared volume ratio is 40-100%.
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|---|---|---|---|
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| CN101315026B (en) * | 2008-07-01 | 2011-08-31 | 北京中矿科能煤炭地下气化技术研究中心 | Underground coal gasification system and producing process |
| CN101382065B (en) * | 2008-09-04 | 2012-05-02 | 乌兰察布新奥气化采煤技术有限公司 | No-shaft underground gasification process |
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| CN102419158B (en) * | 2010-09-27 | 2013-10-30 | 新奥科技发展有限公司 | Method for acquiring shape of combustion space area in underground coal gasification model test furnace |
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