CN109779599A - A kind of coalfield pure oxygen pressure break gasification process - Google Patents
A kind of coalfield pure oxygen pressure break gasification process Download PDFInfo
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- CN109779599A CN109779599A CN201910090933.7A CN201910090933A CN109779599A CN 109779599 A CN109779599 A CN 109779599A CN 201910090933 A CN201910090933 A CN 201910090933A CN 109779599 A CN109779599 A CN 109779599A
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Abstract
The invention discloses a kind of coalfield pure oxygen pressure break gasification process, include the following steps: a, drilling well, carry out drilling well from ground to coal seam, include air inlet, it is drilling at the air inlet side 50m, is being venthole, the seal of tube of trapping is carried out to the air inlet and the venthole after drilling；B, it lights a fire；C, pressure break penetrates through；D, underground gasification；E, gas recycles, and recycles to the pure oxygen in high pressure in the step d.Beneficial effect is: the present invention guarantees outlet quality by injection pure oxygen, the coal gas of output is set to reach the standard of industry needs, and using with high-temperature gas come pressure break, conducting drilling between coal body, CO2 emissions reduce 80%, and exploitation and transport pollution decline to a great extent, and 60% or more energy can be made to be utilized, simultaneously without underground operators, coal underground mining is become ground gas production, to ensure that production safety, cost of winning is low.
Description
Technical field
The present invention relates to technical field of coal exploitation, more particularly to a kind of coalfield pure oxygen pressure break gasification process.
Background technique
Underground coal gasification(UCG) is will controlledly to be burnt in the coal of underground, passes through heat effect to coal and chemistry
Effect generates the process of fuel gas.Coal underground gasification technology can not only recycle the coal resources of mine abandonment, but also
Can be used for that recovery well work is difficult to exploit or exploit the poor girdle of economy, safety, deep fractures, " under three " press coal and
High-sulfur, high ash, high gas layer.Underground gasified gas can be used as that combustion gas is directly civilian and power generation, and can be also used for
Extract pure hydrogen or as synthetic oil, dimethyl ether, ammonia, methanol unstripped gas.
Application No. is 201410783704.4 Chinese patent, disclose a kind of no well formula underground coal gasification system and
Technique.Including gasifying agent injection hole, gas exit drilling, drilling support tube, igniting and gas injection device, injection point backing device
And water plug.The system is equipped with multiple gas exit drillings for piercing coal seam vertically, and the gas exit drilling passes through one
Item is connected to along the gasifying agent injection hole of drilling in coal, and the igniting and gas injection device from gasifying agent injection hole enter coal seam
The water plug drills into coal seam from gas exit；Gasification process is: igniting, injection point backing；Judge whether to adjust gas
Agent injection rate and each gasifying agent ratio；Judge whether to move backward ignition point；Starting ignition point mobile device；Judge whether to change
Become gas exit, burns away.
In above-mentioned patent, the coal gas purity of output is lower, it is impossible to meet industrial application demand, drills more, increase at
This, and pressure break medium is not recycled, using effect is poor.
Summary of the invention
The object of the invention is that providing a kind of coalfield pure oxygen pressure break gasification process to solve the above-mentioned problems.
The present invention through the following technical solutions to achieve the above objectives:
A kind of coalfield pure oxygen pressure break gasification process, includes the following steps:
A, drilling well carries out drilling well from ground to coal seam, includes air inlet, is drilling at the air inlet side 50m, to go out
Stomata carries out the seal of tube of trapping to the air inlet and the venthole after drilling；
B, it lights a fire, when intermediate setting of casing injects pure oxygen, is sealed for a period of time after igniting using pure oxygen burning；
C, pressure break penetrates through, and injects pressure break medium from the air inlet to the coal seam, forces the pressure break medium in the coal seam
Middle flowing, and be discharged by the venthole, so that the air inlet be made to be connected in the coal seam with the venthole；
D, underground gasification injects pure oxygen in high pressure from the air inlet to the coal seam, the titanium dioxide for generation of burning in the step b
Carbon and the coal seam carry out gasification reaction, generate thermal energy and gasification gas, thermal energy is to transmitting inside the coal seam to generate pyrolysis
Coal gas, coal gas of the purity that the coal in underground is generated by high temperature and pressure 70% are discharged from the venthole；
E, gas recycles, and recycles to the coal gas in the step d.
Further, the diameter of air inlet described in the step a and the venthole is 100mm.
Further, need to carry out safety monitoring in the step b before being lighted a fire to ensure the safety lighted a fire.
Further, the pressure break medium injected in the step c is pure oxygen in high pressure, is forced into using pure oxygen plunger pump
100kg/cm2, when the pressure in the air inlet sharply declines and the throughput that goes out of the venthole is in the step c
100kg/cm2When above, the air inlet has formed in the coal seam with the venthole and has been connected to crack.
Further, when being monitored in the step e in the venthole as coal gas, coal gas is recycled.
The beneficial effects of the present invention are: the present invention guarantees outlet quality by injection pure oxygen, reaches the coal gas of output
The standard that industry needs, and using with high-temperature gas, come the coal body between pressure break, conducting drilling, CO2 emissions subtract
Few 80%, exploitation and transport pollution decline to a great extent, and 60% or more energy can be made to be utilized, while without underground operators,
Coal underground mining is become ground gas production, to ensure that production safety, cost of winning is low.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of coalfield pure oxygen pressure break gasification process of the present invention.
The reference numerals are as follows:
1, pure oxygen plunger pump；2, air inlet；3, coal seam；4, venthole.
Specific embodiment
A kind of coalfield pure oxygen pressure break gasification process, includes the following steps:
A, drilling well carries out drilling well from ground to the coal seam 3, includes air inlet 2, at the 2 side 50m of air inlet
Drilling is venthole 4, carries out the seal of tube of trapping to the air inlet 2 and the venthole 4 after drilling, the air inlet 2 with
The venthole 4 is located in same horizontal line, the air inlet 2 and the line of 4 bottom end of venthole and the main crack in coal seam 3
Direction is consistent；
B, it lights a fire, closes the venthole 4, quantitative pure oxygen is injected in the 2 intermediate setting of casing of air inlet, igniter is transferred
It to 3 bottom of coal seam, lights a fire, and simultaneously closes off the venthole 4 and the air inlet 2, burning zone is sealed, coal is made
Charcoal burning generates carbon dioxide, i.e. O2+C=CO2, after injecting pure oxygen burning, flame automatic distinguishing；
C, pressure break penetrates through, and after confirmation coal no longer burns, the air inlet 2 is opened, from the air inlet 2 to the coal seam 3
Pressure break medium is injected, forces the pressure break medium to flow in the coal seam 3, and be discharged by the venthole 4, to make described
Air inlet 2 is connected in the coal seam 3 with the venthole 4；
D, underground gasification injects pure oxygen in high pressure from the air inlet 2 to the coal seam 3, at high temperature under high pressure, in the step b
It burns the high pressure gas generated and the coal seam 3 carries out gasification reaction, generate thermal energy and gasification gas, thermal energy is to the coal seam 3
Inside transmitting to generate pyrolysis coal gas, coal gas of the purity that the coal in underground is generated by high temperature and pressure 70%, from it is described out
Stomata 4 is discharged, in 800-1200 DEG C of high temperature and pressure 30kg/cm2Under conditions of pressure above, allow burning coal generate titanium dioxide
Carbon and carbon molecules carry out being combined to carbon monoxide, i.e. CO2+ C=2CO, regenerating two carbon monoxide reduces the row of carbon dioxide
It puts, CO2 emissions reduce 80%, and exploitation and transport pollution decline to a great extent, and along connection crack by the part coal seam 3
Gasification is fallen, and expands connection crack, gradually forms gasification tunnel, forms underground gasification furnace in favor of coal gas discharge；It discharges simultaneously
Heat transfer out is into the coal seam 3, and the dry coal seam 3 increases by 3 gas permeability of coal seam；
E, gas recycles, and recycles to the coal gas in the step d,
In the present embodiment, the diameter of air inlet 2 described in the step a and the venthole 4 is 100mm.
In the present embodiment, need to carry out safety monitoring in the step b before being lighted a fire to ensure the safety lighted a fire.
In the present embodiment, the pressure break medium injected in the step c is pure oxygen in high pressure, is forced into using pure oxygen plunger pump 1
When the pressure in the air inlet 2 sharply declines and the throughput that goes out of the venthole 4 is in 100kg/cm2, the step c
When 100kg/cm2 or more, the air inlet 2 has formed in the coal seam 3 with the venthole 4 and has been connected to crack.
In the present embodiment, when being monitored in the step e in the venthole 4 as coal gas, coal gas is recycled.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.
Claims (5)
1. a kind of coalfield pure oxygen pressure break gasification process, characterized by the following steps:
A, drilling well carries out drilling well from ground to coal seam (3), includes air inlet (2), at the air inlet (2) side 50m
Drilling is venthole (5) to carry out the seal of tube of trapping to the air inlet (2) and the venthole (5) after drilling；
B, it lights a fire, when intermediate setting of casing injects pure oxygen, is sealed for a period of time after igniting using pure oxygen burning；
C, pressure break penetrates through, and injects pressure break medium by the air inlet (2) coal seam Xiang Suoshu (3), forces the pressure break medium in institute
Flowing in coal seam (3) is stated, and is discharged by the venthole (5), to make the air inlet (2) and the venthole (5) in institute
State connection in coal seam (3)；
D, underground gasification injects pure oxygen in high pressure by the air inlet (2) coal seam Xiang Suoshu (3), and burning generates in the step b
Carbon dioxide and the coal seam (3) carry out gasification reaction, generate thermal energy and gasification gas, and thermal energy is passed to the coal seam (3) are internal
It passs to generate pyrolysis coal gas, coal gas of the purity that the coal in underground is generated by high temperature and pressure 70%, from the venthole
(5) it is discharged；
E, gas recycles, and recycles to the coal gas generated in the step d.
2. a kind of coalfield pure oxygen pressure break gasification process according to claim 1, it is characterised in that: described in the step a
Air inlet (2) and the diameter of the venthole (4) are 100mm.
3. a kind of coalfield pure oxygen pressure break gasification process according to claim 1, it is characterised in that: carried out in the step b
Need to carry out safety monitoring before igniting to ensure the safety lighted a fire.
4. a kind of coalfield pure oxygen pressure break gasification process according to claim 1, it is characterised in that: injected in the step c
Pressure break medium be pure oxygen in high pressure, be forced into 100kg/cm using pure oxygen plunger pump (1)2, when the air inlet in the step c
(2) pressure in sharply declines and the throughput that goes out of the venthole (4) is 100kg/cm2When above, the air inlet (2)
It has been formed in the coal seam (3) with the venthole (4) and has been connected to crack.
5. a kind of coalfield pure oxygen pressure break gasification process according to claim 1, it is characterised in that: monitored in the step e
When being coal gas in the venthole (4), coal gas is recycled.
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| CN201910090933.7A CN109779599A (en) | 2019-01-30 | 2019-01-30 | A kind of coalfield pure oxygen pressure break gasification process |
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| CN201910090933.7A CN109779599A (en) | 2019-01-30 | 2019-01-30 | A kind of coalfield pure oxygen pressure break gasification process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111395964A (en) * | 2020-03-27 | 2020-07-10 | 中国石油大学(北京) | Horizontal section cave-making spray gun, tubular column and cave-making method for coal bed gas horizontal well |
| CN113914847A (en) * | 2021-10-22 | 2022-01-11 | 西南石油大学 | Method for improving development of underground coal gasification air cavity by applying fracturing technology |
| CN114151060A (en) * | 2021-11-29 | 2022-03-08 | 安徽顺安矿建工程有限公司 | Preheating ignition device for coal field gasification and coal field gasification method |
| CN117211751A (en) * | 2023-09-04 | 2023-12-12 | 西南石油大学 | Underground coal gasification coupled oil shale and middle-low maturity shale oil development method |
-
2019
- 2019-01-30 CN CN201910090933.7A patent/CN109779599A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111395964A (en) * | 2020-03-27 | 2020-07-10 | 中国石油大学(北京) | Horizontal section cave-making spray gun, tubular column and cave-making method for coal bed gas horizontal well |
| CN111395964B (en) * | 2020-03-27 | 2021-03-23 | 中国石油大学(北京) | Horizontal section cave-making spray gun, tubular column and cave-making method for coal bed gas horizontal well |
| CN113914847A (en) * | 2021-10-22 | 2022-01-11 | 西南石油大学 | Method for improving development of underground coal gasification air cavity by applying fracturing technology |
| CN114151060A (en) * | 2021-11-29 | 2022-03-08 | 安徽顺安矿建工程有限公司 | Preheating ignition device for coal field gasification and coal field gasification method |
| CN117211751A (en) * | 2023-09-04 | 2023-12-12 | 西南石油大学 | Underground coal gasification coupled oil shale and middle-low maturity shale oil development method |
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