CN104314549A - Coal bed underground gasifying method - Google Patents
Coal bed underground gasifying method Download PDFInfo
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- CN104314549A CN104314549A CN201410503097.8A CN201410503097A CN104314549A CN 104314549 A CN104314549 A CN 104314549A CN 201410503097 A CN201410503097 A CN 201410503097A CN 104314549 A CN104314549 A CN 104314549A
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- gasification
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- coal seam
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
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Abstract
The invention relates to a coal bed underground gasifying method. The coal bed underground gasifying method comprises the following steps of establishing a gasifying tunnel in a to-be-gasified coal bed; arranging a plurality of blasting devices in the to-be-gasified coal bed, wherein the blasting devices are arranged corresponding to a plurality of coal bed sections of the to-be-gasified coal bed; igniting or striking a fire in the gasifying tunnel to start the gasifying process; utilizing a flame movement heating method to gradually blast the blasting devices, so as to loosen the coal bed sections before the corresponding coal bed section is gasified. The coal bed underground gasifying method has the advantages that the blasting devices are pre-arranged in the to-be-gasified coal bed, so while cracks in the coal bed are increased by blasting, and the gasifying is also performed; before the gasifying of each coal bed section, the looseness of the corresponding coal bed section is completed, and the gasifying efficiency is improved.
Description
Technical field
The present invention relates to coal seam gasification technical field, particularly about a kind of coal layer underground gasifying method.
Background technology
Underground coal gasification(UCG) carries out in the coal seam in gasification tunnel, and its core technology impels gasifying agent (air or oxygen, steam etc.) fully to contact with subterranean coal, by the pyrolysis of coal and chemical action, produces fuel gas.Therefore, the degree of depth that gasification reaction involves is a coal class that very important diagenesis coal, the carbonizing degree such as parameter, particularly anthracite, meager coal, lean coal are very high, sometimes only carries out at coal face, is unfavorable for that the gasification of coal underground mining utilizes.
In gasification, the crack rate in coal seam (development degree in bedding, joint and crack) directly affects the height of gasifying agent and coal seam exposure level, and therefore cracks in coal seam rate determines the complexity even success or failure that underground gasification carries out.Coal seam initial fissure rate is natural attribute, and generally reduce along with the raising of coal degree of metamorphism, namely low-order coal crack rate is higher, and high-order cleat in coal rate is lower even very low, extremely fine and close, makes underground gasification be difficult to carry out.
Prior art, generally after setting up gasification tunnel, carries out increasing gap to passage; The modes such as usual selection high pressure gas fracturing, increase gap and terminate laggard promoting the circulation of qi metallization processes.And the coal seam increasing gap of prior art can only make original cracks in coal seam expand to some extent by gases at high pressure, because the operating pressure of normal gasifying stage is far below the pressure increasing the gap stage, therefore, after turning to gasifying stage from the increasing gap stage, operating pressure can significantly reduce, the cracks in coal seam that original coal seam has been opened can close gradually with the reduction of pressure, really very little on the impact of gasifying stage, can only play a role to igniting of gap stage of increasing.
Summary of the invention
For overcoming defect and the deficiency of prior art existence, the embodiment of the present invention provides a kind of coal layer underground gasifying method.
Particularly, a kind of coal layer underground gasifying method that the embodiment of the present invention provides, comprises step: in for gasification coal seam, set up gasification tunnel; Multiple destructor is arranged in described wish gasification coal seam, and described multiple destructor corresponding described multiple coal seams section for coal seam of gasifying respectively; Light a fire in described gasification tunnel or ignite to start gasifying process; And utilize flame to move mode of heating to ignite described multiple destructor one by one with loosening described coal seam section before the coal seam section gasification of correspondence.
In one embodiment of the invention, above-mentioned gasification tunnel is directional drilling or has well formula tunnel.
In one embodiment of the invention, above-mentioned multiple destructor is arranged in described in the described gasification tunnel in gasification coal seam.
In one embodiment of the invention, above-mentioned multiple destructor is embedded in described in the described multiple coal seams section in gasification coal seam.
In one embodiment of the invention, be equipped with respectively in above-mentioned multiple destructor be heated after volume sharply expand and the inert substance exploded.
In one embodiment of the invention, above-mentioned inert substance is liquid carbon dioxide, liquid nitrogen or liquid argon.
In one embodiment of the invention, be equipped with respectively in above-mentioned multiple destructor to be heated and produce chemical reaction, reaction product and be inert substance and after reaction, volume sharply expands the material exploded.
In one embodiment of the invention, igniting or ignite to start before gasifying process step carries out, described gasification tunnel to be put into by the pillar burnt and place removable air injection pipe at described pillar in described gasification tunnel.
In one embodiment of the invention, above-mentioned flame moves heating is undertaken by mobile described removable air injection pipe.
In one embodiment of the invention, the catalyzer promoting coal seam gasification is equipped with in above-mentioned multiple destructor.
Therefore, it is one or more that the embodiment of the present invention can be reached in following beneficial effect: loosening improvement has been carried out in (1) wall gasification to coal seam, loosen in advance owing to improving rear coal seam gasifying agent better contacted with coal seam, to produce the effect of augmenting response contact surface; (2) after destructor blast, the material of release is inert substance, send in advance, but can not produce the impact of man-made further destroy on flame range after explosion to for gasification coal seam; (3) carried out adding catalyzer to coal seam gasification to improve, because the catalyzer added after improving makes coal seam gasification better carry out, institute to produces the generating rate effect of increase available gas; And (4) carry out position control improvement to coal layer loosening, after improving, by the mobile high temperature location controlling coal seam of air injection pipe, demolition point is better controlled, institute to produces the effect of only carrying out coal layer loosening in position of gasifying.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of manual, and can become apparent to allow above and other objects of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Figure 1 shows that the directional drilling coal layer underground gasifying implementation schematic diagram of first embodiment of the invention.
The laneway type that Fig. 2 a and 2b is depicted as second embodiment of the invention has well coal layer underground gasifying implementation schematic diagram.
Detailed description of the invention
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, proposing detailed description of the invention, structure, feature and effect thereof to according to the present invention, being described in detail as follows.
[the first embodiment]
Refer to Fig. 1, it is the directional drilling coal layer underground gasifying implementation schematic diagram of first embodiment of the invention.As shown in Figure 1:
Arrange separate multiple destructors 13 in the coal seam gasification passage 16 of having constructed complete in wish gasification coal seam 12, gasification tunnel 16 is formed between roof 11 and seat earth 17, and in the present embodiment, gasification tunnel 16 is directional drilling.According to the installation site of multiple destructor 13, divided into multiple coal seams section (not indicating in figure) for gasification coal seam 12, described multiple destructor 13 is corresponding with each coal seam section respectively.In addition, the blast radius of influence of each destructor 13 is preferably the distance that it arrives roof 11, and blast affects the spacing that diameter is preferably each destructor 13.Light a fire or ignite after starting gasifying process in gasification tunnel 16, move mode of heating with flame and ignite each destructor 13 one by one, such as when flame moves to the position of certain destructor 13, reach the design temperature of destructor 13, destructor 13 explodes, and can form crack in corresponding coal seam section.
Material accommodating in each destructor 13 not only can use liquid carbon dioxide (CO2), and also can adopt other inert substance, after this inert substance is heated, volume sharply expands and explodes, such as liquid nitrogen, liquid argon etc.In addition, in each destructor 13 accommodating material can also be heated after high temperature there is violent chemical reaction, reaction product is inert substance and after reaction, volume sharply expands the material exploded.
In addition, can also place the catalyzer that can promote coal seam gasification in each destructor 13, after destructor 13 explodes, catalyzer can be distributed in air blast the surface loosening rear coal seam, promotes the catalytic gasification in coal seam.For the catalyst type that coal seam gasification adopts, it is prior art, therefore will not itemize at this.
In addition, can transfer in gasification tunnel 16 and by the pillar 14 burnt, and removable air injection pipe 15 can be placed in pillar 14 inside, light a fire or ignite after starting gasifying process, when removable air injection pipe 15 moves backward to destructor 13 position, flame also can move backward to the position of destructor 13 along a pillar 14, along with the expansion of removable air injection pipe 15 front end flame work plane, the temperature at destructor 13 place can be more and more higher, when temperature be elevated to can ignite destructor 13 time, the inert substance such as liquid CO 2 expanded by heating of destructor 13 inside, when expansion force is greater than after destructor 13 outer wall bears pressure, will blast, the force of explosion of its moment loosens for gasification coal seam 12, add the cracks in coal seam for gasification coal seam 12, increase gasifying agent and the response area for coal seam 12 of gasifying, promote the carrying out of gasification, add gasification efficiency.
[the second embodiment]
Refer to Fig. 2 a and 2b, it is that the laneway type of second embodiment of the invention has well coal layer underground gasifying implementation schematic diagram.As shown in Figure 2:
Have in well coal seam gasification at laneway type, first in for gasification coal seam 12, arrange multiple destructor 13, and each destructor 13 is embedded in the coal seam between roof 11 and seat earth 14.The blast radius of influence of each destructor 13 is preferably the distance that it arrives roof 11, and blast affects the spacing that diameter is preferably each destructor 13.By strengthening the thickness of two terminations of the destructor 13 buried underground, it is made not blown at explosion time.After destructor 13 arranges, seal itself and the gap for coal seam 12 of gasifying.
Afterwards, can be similar to shown in Fig. 1, in gasification tunnel 16, place pillar and a removable air injection pipe; When mobile air injection pipe makes flame move to certain destructor 13 place, the temperature at destructor 13 place can be more and more higher, when temperature be elevated to can ignite destructor 13 time, the inert substance such as liquid CO 2 expanded by heating of destructor 13 inside, when expansion force is greater than after destructor 13 outer wall bears pressure, will blast, the force of explosion of its moment loosens for gasification coal seam 12, add the cracks in coal seam for gasification coal seam 12, increase gasifying agent and the response area for coal seam 12 of gasifying, promote the carrying out of gasification, add gasification efficiency.In the present embodiment, gasification tunnel 16 is for there being well formula tunnel.
Be understandable that, in each destructor 13 in second embodiment of the invention, also accommodatingly violent chemical reaction can occur after the high temperature that is heated, reaction product is inert substance and after reaction, volume sharply expands the material exploded.In addition, the catalyzer of coal seam gasification can also accommodatingly be promoted in each destructor 13.
In sum, the embodiment of the present invention, by installing demolition set in advance in for gasification coal seam, increases crack by explosion while gasification in coal seam, completes and loosens the pre-of this section of coal seam, improve gasification efficiency before every section of coal seam gasification.More specifically: a) loosening improvement has been carried out in the gasification of its wall to coal seam, loosen in advance owing to improving rear coal seam gasifying agent better contacted with coal seam, to produce the effect of augmenting response contact surface; B) material discharged after destructor implode is inert substance, send in advance, but can not produce the impact of man-made further destroy on flame range after explosion to the coal seam for gasification; C) carried out adding catalyzer to coal seam gasification to improve, because the catalyzer added after improving makes coal seam gasification better carry out, institute to produces the generating rate effect of increase available gas; And d) position control improvement is carried out to coal layer loosening, after improving, by the mobile high temperature location controlling coal seam of air injection pipe, demolition point is better controlled, institute to produces the effect of only carrying out coal layer loosening in position of gasifying.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a coal layer underground gasifying method, is characterized in that, comprises step:
Gasification tunnel is set up in for gasification coal seam (12);
Arrange multiple destructor (13) described for gasification coal seam (12) is middle, described multiple destructor (13) is corresponding described multiple coal seams section for coal seam of gasifying respectively;
Light a fire in described gasification tunnel (16) or ignite to start gasifying process; And
Utilize flame to move mode of heating and ignite described multiple destructor (13) one by one to loosen described coal seam section before the coal seam section gasification of correspondence.
2. coal layer underground gasifying method as claimed in claim 1, it is characterized in that, described gasification tunnel is directional drilling or has well formula tunnel.
3. coal layer underground gasifying method as claimed in claim 1, is characterized in that, described multiple destructor (13) is arranged in described in the described gasification tunnel (16) in gasification coal seam (12).
4. coal layer underground gasifying method as claimed in claim 1, is characterized in that, described multiple destructor (13) is embedded in described in the described multiple coal seams section in gasification coal seam (12).
5. coal layer underground gasifying method as claimed in claim 1, is characterized in that, is equipped with volume after being heated respectively and sharply expands and the inert substance that explodes in described multiple destructor (13).
6. coal layer underground gasifying method as claimed in claim 5, it is characterized in that, described inert substance is liquid carbon dioxide, liquid nitrogen or liquid argon.
7. coal layer underground gasifying method as claimed in claim 1, it is characterized in that, being equipped with respectively in described multiple destructor (13) is heated produces chemical reaction, reaction product and is inert substance and after reaction, volume sharply expands the material exploded.
8. coal layer underground gasifying method as claimed in claim 1, it is characterized in that, igniting or ignite starts before gasifying process step carries out in the described gasification tunnel (16), can be put into described gasification tunnel (16) and described pillar (14) the removable air injection pipe of placement (15) by the pillar (14) burnt.
9. coal layer underground gasifying method as claimed in claim 1, is characterized in that, it is undertaken by mobile described removable air injection pipe (15) coming that described flame moves heating.
10. the coal layer underground gasifying method as described in claim 1 to 9 any one, is characterized in that, is equipped with the catalyzer promoting coal seam gasification in described multiple destructor (13).
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| CN201410503097.8A CN104314549B (en) | 2014-09-26 | 2014-09-26 | Coal layer underground gasifying method |
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| CN201410503097.8A CN104314549B (en) | 2014-09-26 | 2014-09-26 | Coal layer underground gasifying method |
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| CN104314549B CN104314549B (en) | 2019-01-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107091078A (en) * | 2017-06-15 | 2017-08-25 | 新疆国利衡清洁能源科技有限公司 | Underground coal gasification passage and its method |
| CN109736766A (en) * | 2019-01-31 | 2019-05-10 | 中国矿业大学 | Strengthen the advanced pressure break C-shaped furnace method in coal seam of underground coal gasification(UCG) chemical reaction |
| CN110939424A (en) * | 2019-11-27 | 2020-03-31 | 西安物华巨能爆破器材有限责任公司 | Well-free underground coal gasification ignition method |
| CN112096358A (en) * | 2020-09-25 | 2020-12-18 | 山东科技大学 | Underground coal gasification mining method for drilling blasting cracking loose coal bed |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107091078A (en) * | 2017-06-15 | 2017-08-25 | 新疆国利衡清洁能源科技有限公司 | Underground coal gasification passage and its method |
| CN109736766A (en) * | 2019-01-31 | 2019-05-10 | 中国矿业大学 | Strengthen the advanced pressure break C-shaped furnace method in coal seam of underground coal gasification(UCG) chemical reaction |
| CN109736766B (en) * | 2019-01-31 | 2020-11-03 | 中国矿业大学 | Coal seam advanced fracturing C-shaped furnace method for strengthening coal underground gasification chemical reaction |
| CN110939424A (en) * | 2019-11-27 | 2020-03-31 | 西安物华巨能爆破器材有限责任公司 | Well-free underground coal gasification ignition method |
| CN112096358A (en) * | 2020-09-25 | 2020-12-18 | 山东科技大学 | Underground coal gasification mining method for drilling blasting cracking loose coal bed |
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Effective date of registration: 20170203 Address after: 065001 Hebei economic and Technological Development Zone, Langfang science and Technology Park in the Southern District of B building, room 522 Applicant after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: The 065001 Hebei economic and Technological Development Zone of Langfang Huaxiang Xinyuan host new Austrian Science and Technology Park in Southern District Applicant before: ENN Coal Gasification Co., Ltd. |
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