CN104533380B - Underground coal gasification system - Google Patents
Underground coal gasification system Download PDFInfo
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- CN104533380B CN104533380B CN201410751173.7A CN201410751173A CN104533380B CN 104533380 B CN104533380 B CN 104533380B CN 201410751173 A CN201410751173 A CN 201410751173A CN 104533380 B CN104533380 B CN 104533380B
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- well
- inlet well
- gas injection
- water filling
- water
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- 239000003245 coal Substances 0.000 title claims abstract description 69
- 238000002309 gasification Methods 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000002347 injection Methods 0.000 claims abstract description 87
- 239000007924 injection Substances 0.000 claims abstract description 87
- 238000005553 drilling Methods 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 238000003780 insertion Methods 0.000 claims description 15
- 230000037431 insertion Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 55
- 239000003208 petroleum Substances 0.000 description 8
- 239000011435 rock Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000003034 coal gas Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention provides a kind of underground coal gasification system, including the inlet well using orientation horizontal well drilling, and the gas injection device of controllable movement is provided with the inlet well, and the gas injection device is used to select position injection gasifying agent in gas injection；Using the inlet well of orientation horizontal well drilling, the horizontal segment of the inlet well is located at the vertical top of horizontal segment of inlet well, and the water filling device of controllable movement is provided with the inlet well, and the water filling device is used to inject water or vapor in injection point position；Control device, for controlling gas injection device and water filling device progressively to retreat respective distance, enable the injection point position of water filling device to follow the gas injection point position of gas injection device to move the red-hot region by water or vapor injection coal seam movement, therefore the utilization rate of water or vapor can be improved.
Description
Technical field
The present invention relates to field of coal mining, more particularly to a kind of underground coal gasification system.
Background technology
Underground coal gasification(UCG) (Underground Coal Gasification) is that the coal in underground has been carried out into control
The burning of system ground, the process of fuel gas is produced by the heat effect to coal and chemical action.In underground coal gasification(UCG) implementation process
In, it is necessary to inject gasifying agent and water or vapor, its reclaimed water or vapor are used to water-gas occur with red-hot coal seam anti-
Hydrogen and carbon monoxide should be generated.
Prior art underground coal gasification system as disclosed in patent application 2013100641272.5, its water or water steam
The decanting point position of gas is fixedly installed in inlet channel, and its water injected or vapor gasify as gasifying agent enters together
Passage.In gasification, red-hot coal seam is usually located above its gas injection point and gasification tunnel, the water or water for causing it to inject
Steam largely lodges in burned out area domain.So that most of water or vapor can not participate in water gas reaction, therefore drop
The low utilization rate of water or vapor.
The content of the invention
The present invention provides a kind of coal underground gas in the red-hot region moved when water or vapor are injected into coal combustion
Change system solves above-mentioned technical problem, and the system includes：
Using the inlet well of orientation horizontal well drilling, the gas injection device of controllable movement, the note are provided with the inlet well
Device of air is used to select position injection gasifying agent in gas injection；
Using the inlet well of orientation horizontal well drilling, the horizontal segment of the inlet well be located at inlet well horizontal segment it is vertical on
Side, is provided with the water filling device of controllable movement in the inlet well, the water filling device be used to injecting in injection point position water or
Person's vapor；
Connect the insertion well of inlet well terminal；
Control device, for controlling gas injection device and water filling device progressively to retreat respective distance so that the note of water filling device
Water spot position can follow the gas injection point position of gas injection device to move what is moved when water or vapor are injected into coal combustion
Red-hot region.
In one embodiment of the invention, the system also includes the outlet well using orientation horizontal well drilling, the outlet well
Terminal be communicated to above-mentioned insertion well, the horizontal segment of the outlet well is located at the vertical top of horizontal segment of inlet well and internal set
There is screen casing.
In one embodiment of the invention, screen casing or high temperature combustible material are provided with the horizontal segment of the inlet well
Manufactured sleeve pipe, the gas injection device are arranged in the screen casing or sleeve pipe.
In one embodiment of the invention, the inlet well) horizontal segment in be provided with screen casing, the water filling device
It is arranged in the screen casing.
In one embodiment of the invention, the system also horizontal segment including the inlet well is located at the level of inlet well
4~10m positions above Duan Shuzhi.
In one embodiment of the invention, the insertion well is also communicated to the terminal of inlet well.
In one embodiment of the invention, the system also includes being used for the first thermometric dress for measuring effluent air temp
Put, the control device controls gas injection device to retreat corresponding distance when the temperature that the first temperature measuring equipment measures is more than 200 DEG C
And water filling device is controlled to inject quantitative water or vapor.
In one embodiment of the invention, the system also includes being used for the group for measuring combustible gas components in discharge gas
Divide detection means, wherein the component of measured combustible is used for the calorific value for calculating discharge gas, the control device is calculating
To the gas calorific value that goes out often mark side or control gas injection device retrogressing respective distance and control water filling when declining 25% less than 800 kilocalories
Device injects quantitative water or vapor.
In one embodiment of the invention, the structure of the gas injection device of the controllable movement and/or water filling device is company
Continuous oil pipe and the injection head for being connected to the coiled tubing one end.
Above-mentioned underground coal gasification system is provided with the water filling device and gas injection device of controllable movement, by controlling water filling to fill
Put with gas injection device back alternately and water filling device injection water or vapor are controlled during alternating, so that water filling device
Injection point position can follow gas injection device gas injection point position move by water or vapor injection coal seam movement it is vehement
Thermal region, therefore the utilization rate of water or vapor can be improved.
Brief description of the drawings
Fig. 1 and Fig. 2 is the schematic diagram of the better embodiment of gasification face first of underground coal gasification system of the present invention.
Fig. 3 is the schematic diagram of the better embodiment of gasification face second of underground coal gasification system of the present invention.
Fig. 4 is the schematic diagram of underground coal gasification system better embodiment control section of the present invention.
Embodiment
Further to illustrate the present invention to reach the technological means and effect that predetermined goal of the invention is taken, below in conjunction with
Accompanying drawing and preferred embodiment, to proposing embodiment, structure, feature and its effect according to the present invention, describe in detail as after.
On embodiment：
Refer to Fig. 1 and Fig. 2, a kind of gasification work of first better embodiment of underground coal gasification system of the present invention
Face includes inlet well 1, inlet well 2 and insertion well 4.
Using horizontal well drilling is oriented, it is penetrated into coal seam 5 inlet well 1 after passing through overlying rock 6 from the side in coal seam 5,
For providing gas injection (gasifying agent) passage.The horizontal segment of inlet well 1 is usually located at vertical top 0.5~2m positions of the bottom plate of coal seam 5
Put.Among present embodiment, the horizontal segment of inlet well 1 is located at 1m positions above the bottom plate of coal seam 5.Inlet well 1 in Fig. 1 and Fig. 2
Horizontal segment total length is 250m.The horizontal segment of the inlet well 1 can be open-hole, and screen casing or height can also be set inside it
Sleeve pipe made of warm combustible material (such as fiberglass) so that gasifying agent smoothly can eject auxiliary coal seam from gas injection point position
Burning.Petroleum casing pipe can be respectively adopted in the inclination section and vertical section of the inlet well 1.Horizontal segment, the deflecting of the inlet well 1
Section and vertical section sleeve pipe aperture are unified for 177mm.
Inlet well 2 sets the phase homonymy of inlet well 1 to be penetrated after passing through overlying rock 6 using orientation horizontal well drilling from coal seam 5
Into coal seam 5, for providing water filling (water or vapor) passage.It is vertical that the horizontal segment of inlet well 2 is located at the horizontal segment of inlet well 1
Top 4~10m positions.Among present embodiment, the horizontal segment of inlet well 2 is located at 10m positions above the horizontal segment sleeve pipe of inlet well 1
Put.The total length of inlet well 2 is 255m in Fig. 1, and inlet well total length is 250m in Fig. 2.The horizontal segment of the inlet well 2 can be with
For open-hole, screen casing can also be set in it, so that water or water vapour smoothly can be discharged and join from injection point position
Add water gas reaction.Petroleum casing pipe can be set in the inclination section and vertical section of the inlet well 2.The level of the inlet well 2
The aperture of section, inclination section and vertical section sleeve pipe is unified for 177mm.
Insertion well 4 is penetrated into coal seam 5 after passing through overlying rock 6 from the opposite side in coal seam 5.Well 4 is penetrated in Fig. 1 using fixed
To off-angle drilling, inclination section part uses petroleum casing pipe, terminal of the sleeve pipe with lower part using open-hole connection inlet well 1.Passed through in Fig. 2
Drifting 4 is using the Vertical Well of petroleum casing pipe, terminal of the sleeve pipe with lower part using open-hole connection inlet well 1.Insertion well 4 also connects
To the terminal of inlet well 2, so that coal gas discharge is more smooth.It is all 177mm that the sleeve pipe aperture of well 4 is penetrated in Fig. 1 and Fig. 2.
After working face connection, implement pressure-air purging to each passage, be achieved that the gasification face is built after purging.
After the completion of working face structure, igniting is implemented by opening position of the insertion well 4 in the terminal of inlet well 1.After the completion of igniting, by inlet well 1
Gasifying agent is injected, water or vapor are injected by inlet well 2, coal gas discharges gasification face by insertion well 4 caused by working face.
Fig. 3 is referred to, a kind of second better embodiment of the gasification face of underground coal gasification system of the present invention
Schematic diagram.The gasification face of the embodiment includes inlet well 1, inlet well 2, outlet well 3 and insertion well 4.
Inlet well 1 is penetrated into coal seam 5 after passing through overlying rock 6 from the side in coal seam 5 using orientation horizontal well drilling, is used for
Gas injection (gasifying agent) passage is provided.The horizontal segment of inlet well 1 is located at top 0.5~2m positions of the bottom plate of coal seam 5.In this embodiment party
Among formula, the horizontal segment of inlet well 1 is located at 1m positions above the bottom plate of coal seam 5, and the horizontal segment total length of inlet well 1 is 250m.It is described
The horizontal segment of inlet well 1 can be open-hole, and screen casing or high temperature combustible material (such as fiberglass) system can also be set in it
Into sleeve pipe so that gasifying agent can smoothly eject auxiliary coal combustion from gas injection point position.The inclination section of the inlet well 1
With petroleum casing pipe can be set in vertical section.Horizontal segment, inclination section and the vertical section sleeve pipe aperture of the inlet well 1 are unified for
177mm。
Inlet well 2 sets the phase homonymy of inlet well 1 to be penetrated after passing through overlying rock 6 using orientation horizontal well drilling from coal seam 5
Into coal seam 5, for providing waterflood path.The horizontal segment of inlet well 2 is located at the vertical top of the horizontal segment of inlet well 1 4~10m positions
Put.Among present embodiment, the horizontal segment of inlet well 2 is located at 10m positions above the horizontal segment sleeve pipe of inlet well 1, inlet well 2 it is total
Length 255m.The horizontal segment of the inlet well 2 can be open-hole, screen casing can also be set in it, so that water or water
Steam can smoothly discharge from injection point position and participate in water gas reaction.Inclination section and the vertical section difference of the inlet well 2
Petroleum casing pipe can be used.The aperture of the horizontal segment of the inlet well 2, inclination section and vertical section sleeve pipe is unified for 177mm.
Outlet well 3 sets the phase homonymy of inlet well 1 to be penetrated after passing through overlying rock 6 using orientation horizontal well drilling from coal seam 5
Into coal seam 5.The horizontal segment of the outlet well 3 is located at the vertical top 15m positions of the horizontal segment of inlet well 1, and horizontal segment total length is
258m.Screen casing is provided with the horizontal segment of the outlet well 3, is respectively arranged with the inclination section and vertical section of the outlet well 3
Petroleum casing pipe.The coal gas that the screen construction is advantageous to generation enters outlet well 3.The screen casing can be by high temperature combustible material system
Into, such as fiberglass.The horizontal segment of outlet well 3, inclination section and vertical section sleeve pipe aperture are unified for 215mm.
Insertion well 4 is penetrated into coal seam 5 after passing through overlying rock 6 from the opposite side in coal seam 5.Among present embodiment,
Well 4 is penetrated using petroleum casing pipe orientation off-angle drilling, terminal of the sleeve pipe with lower part using open-hole connection inlet well 1 and outlet well 3.
It is 177mm to penetrate the sleeve pipe aperture of well 4.
After working face connection, implement pressure-air purging to each passage, be achieved that gasification face is built after purging.Work
After the completion of making face structure, igniting is implemented by opening position of the insertion well 4 in the terminal of inlet well 1.Insertion well 4 is closed after the completion of igniting,
Gasifying agent is injected by inlet well 1, water or vapor are injected by inlet well 2, coal gas discharges gas by outlet well 3 caused by working face
Change working face.
With reference to figure 4, the underground coal gasification system also includes control device 7, is arranged at the note of controllable movement in inlet well 1
Device of air 8, the water filling device 9 for the controllable movement being arranged in inlet well 2.Gas injection device 8 is used for auxiliary in the injection of gas injection point position
The gasifying agent for helping coal seam 5 to burn.Water filling device 9 is used to steam in the water required for injection point position injection water gas reaction or water
Gas.Among present embodiment, the structure of gas injection device 8 and/or water filling device 9 for coiled tubing and is connected to coiled tubing
The injection head of one end, gas injection device 8 and water filling device 9 is controlled to retreat by pulling the other end of coiled tubing.When gas injection fills
When putting 8 and the movement of water filling device 9, its gas injection point position and injection point position are also accordingly moved.
Control device 7 be used for control gas injection device 8 and water filling device 9 progressively retreats respective distance (such as every time retrogressing away from
From 4~6m) so that the injection point position of water filling device can follow the gas injection point position of gas injection device 8 move water or
The red-hot region that vapor injection coal seam 5 is moved when burning.
Among present embodiment, the underground coal gasification system includes being used for the first thermometric for measuring effluent air temp
Device 10 or the component detection means 11 that combustible gas components in gas are discharged for measuring, wherein the group of measured combustible
Divide the calorific value for being used for calculating discharge gas.When temperature that the first temperature measuring equipment 10 measures is more than 200 DEG C, or it is being calculated
Go out gas calorific value less than 800 kilocalories often mark side or decline 25% when, show gas injection device 8 injection gasifying agent contact fresh coal
Layer tails off, and unnecessary gasifying agent has burnt active principle, therefore control device 7 needs to control gas injection device 8 to retreat in time
Above-mentioned respective distance simultaneously controls water filling device 9 to inject water or vapor.
Among other embodiment, the underground coal gasification system can not include above-mentioned first temperature measuring equipment 10 and group
Divide detection means 11, the control device 7 can go out 4~6m coal combustions according to feature calculations such as coal seam quality and thickness and fall to have
The time needed for component is imitated, and then the Best Times and control gas injection device 8 and note of injection water or vapor can be drawn
The time that water installations 9 retreat.
The underground coal gasification system can also include the second temperature measuring equipment 12 being additional on water filling device 9.This second
Temperature measuring equipment 12 is used to measure the temperature positioned at the injection point position rear specific range point of water filling device 9, such as can be water filling
Point position 2m or 4m position.When the temperature value that the second temperature measuring equipment 12 measures is more than 50 DEG C, this timed unit 7 needs to control
Water filling device 9 retreats respective distance so that and the injection point of water filling device 9 is located at the surface of the gas injection point position of gas injection device 8, because
This can be avoided blowing the water filling device 9.
In summary, underground coal gasification system of the invention at least has the following advantages that：
1. in the underground coal gasification system of the present invention, the underground coal gasification system is provided with the note of controllable movement
Water installations and gas injection device, by controlling water filling device and gas injection device back alternately and controlling water filling device to note during alternating
Enter water or vapor, so that the injection point position of water filling device can follow the gas injection point position of gas injection device to move
By water or the red-hot region of vapor injection coal seam movement, therefore the utilization rate of water or vapor can be improved.
2. in one embodiment of the underground coal gasification system of the present invention, the second temperature measuring equipment is used to measure positioned at note
The temperature of water installations injection point position rear specific range point.When the temperature value that the second temperature measuring equipment measures is more than 50 DEG C, this
Timed unit needs to control water filling device to retreat respective distance so that the injection point of water filling device is located at gas injection device gas injection point
The surface of position, therefore can avoid blowing the water filling device.
Embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize the present invention
The equivalent structure or equivalent flow conversion that specification and accompanying drawing content are made, or directly or indirectly it is used in other related technologies
Field, it is included within the scope of the present invention.
Claims (10)
1. a kind of underground coal gasification system, it is characterised in that the system includes：
Using the inlet well (1) of orientation horizontal well drilling, the gas injection device (8) of controllable movement, institute are provided with the inlet well (1)
Gas injection device (8) is stated to be used to select position injection gasifying agent in gas injection；
Using the inlet well (2) of orientation horizontal well drilling, the horizontal segment that the horizontal segment of the inlet well (2) is located at inlet well (1) erects
Straight top, the interior water filling device (9) for being provided with controllable movement of the inlet well (2), the water filling device (9) are used in injection point
Water or vapor are injected in position；
Connect the insertion well (4) of inlet well (1) terminal；
Control device (7), for controlling gas injection device (8) and water filling device (9) progressively to retreat respective distance so that water filling device
(9) injection point position can follow the gas injection point position of gas injection device (8) to move water or vapor injection coal seam (5)
The red-hot region moved during burning.
2. underground coal gasification system according to claim 1, further comprises：
Using the outlet well (3) of orientation horizontal well drilling, the terminal of the outlet well (3) is communicated to above-mentioned insertion well (4), it is described go out
Gas well (3) horizontal segment is located at the vertical top of inlet well (2) and is internally provided with screen casing.
3. underground coal gasification system according to claim 1 or 2, it is characterised in that：
Sleeve pipe made of screen casing or high temperature combustible material, the gas injection device are provided with the horizontal segment of the inlet well (1)
(8) it is arranged in the screen casing or sleeve pipe.
4. underground coal gasification system according to claim 1 or 2, it is characterised in that：
Screen casing is provided with the horizontal segment of the inlet well (2), the water filling device (9) is arranged in the screen casing.
5. underground coal gasification system according to claim 1 or 2, it is characterised in that：
The horizontal segment of the inlet well (2) is located at the vertical top of horizontal segment 4~10m positions of inlet well (1).
6. underground coal gasification system according to claim 1 or 2, it is characterised in that：
The insertion well (4) is also communicated to the terminal of inlet well (2).
7. underground coal gasification system according to claim 1 or 2, further comprises：
For measuring the first temperature measuring equipment (10) of effluent air temp, the control device (7) is in the first temperature measuring equipment (10)
Control gas injection device (8) to retreat respective distance when the temperature measured is more than 200 DEG C and control water filling device (9) to inject quantitative water
Or vapor.
8. underground coal gasification system according to claim 1 or 2, further comprises：
The component detection means (11) of combustible gas components in gas is discharged for measuring, wherein the component of measured combustible is used
In calculate discharge gas calorific value, the control device (7) be calculated go out gas calorific value less than 800 kilocalories often mark side or
Control gas injection device (8) to retreat respective distance when declining 25% and control water filling device (9) to inject quantitative water or vapor.
9. underground coal gasification system according to claim 1 or 2, further comprises：
The second temperature measuring equipment (12) being additional on water filling device (9), it is located at injection point position rear specific range for measuring
The temperature of point, the control device (7) control water filling device when the temperature value that the second temperature measuring equipment (12) measures is more than 50 DEG C
(9) respective distance is retreated.
10. underground coal gasification system according to claim 1 or 2, it is characterised in that：
The gas injection device (8) of the controllable movement and/or the structure of water filling device (9) are coiled tubing and are connected to the company
The injection head of continuous oil pipe one end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410751173.7A CN104533380B (en) | 2014-12-09 | 2014-12-09 | Underground coal gasification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410751173.7A CN104533380B (en) | 2014-12-09 | 2014-12-09 | Underground coal gasification system |
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| CN104533380A CN104533380A (en) | 2015-04-22 |
| CN104533380B true CN104533380B (en) | 2018-01-16 |
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|---|---|---|---|---|
| CN1112188A (en) * | 1995-03-15 | 1995-11-22 | 柴兆喜 | Gasifying method for coal seam |
| RU2307244C1 (en) * | 2006-02-20 | 2007-09-27 | Институт угля и углехимии СО РАН (ИУУ СО РАН) | Method for underground coal seam series gasification |
| CN101382061A (en) * | 2007-09-07 | 2009-03-11 | 新奥科技发展有限公司 | Novel coalbed gas thermal recovery process |
| CN102287177A (en) * | 2011-08-19 | 2011-12-21 | 秦勇 | Method for gasifying underground coal |
| RU2442899C1 (en) * | 2010-06-25 | 2012-02-20 | Михаил Владимирович Попов | Method for removing gas from unfanned coal seams |
| CN103437748A (en) * | 2013-09-04 | 2013-12-11 | 新奥气化采煤有限公司 | Underground coal gasifying furnace and underground coal gasifying method |
-
2014
- 2014-12-09 CN CN201410751173.7A patent/CN104533380B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112188A (en) * | 1995-03-15 | 1995-11-22 | 柴兆喜 | Gasifying method for coal seam |
| RU2307244C1 (en) * | 2006-02-20 | 2007-09-27 | Институт угля и углехимии СО РАН (ИУУ СО РАН) | Method for underground coal seam series gasification |
| CN101382061A (en) * | 2007-09-07 | 2009-03-11 | 新奥科技发展有限公司 | Novel coalbed gas thermal recovery process |
| RU2442899C1 (en) * | 2010-06-25 | 2012-02-20 | Михаил Владимирович Попов | Method for removing gas from unfanned coal seams |
| CN102287177A (en) * | 2011-08-19 | 2011-12-21 | 秦勇 | Method for gasifying underground coal |
| CN103437748A (en) * | 2013-09-04 | 2013-12-11 | 新奥气化采煤有限公司 | Underground coal gasifying furnace and underground coal gasifying method |
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Effective date of registration: 20170209 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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