CN107269256B - Underground coal gasification filling wellhead device - Google Patents
Underground coal gasification filling wellhead device Download PDFInfo
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- CN107269256B CN107269256B CN201710666956.9A CN201710666956A CN107269256B CN 107269256 B CN107269256 B CN 107269256B CN 201710666956 A CN201710666956 A CN 201710666956A CN 107269256 B CN107269256 B CN 107269256B
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- 238000002309 gasification Methods 0.000 title claims abstract description 111
- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 178
- 239000007924 injection Substances 0.000 claims abstract description 178
- 230000005540 biological transmission Effects 0.000 claims abstract description 59
- 239000003034 coal gas Substances 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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- 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
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
The invention provides a wellhead device for underground coal gasification and filling. The device comprises: the device comprises a first injection device, a second injection device and a gas transmission device; wherein, the first injection device is communicated with the gasification furnace; the second injection device is communicated with the first injection device and is used for injecting the filling medium into the gasification furnace through the first injection device; the gas transmission device is communicated with the first injection device and is used for outputting coal gas through the first injection device or injecting a gasification agent into the gasification furnace. According to the invention, the second injection device and the gas transmission device are both communicated with the gasification furnace through the first injection device, the second injection device can inject filling media into the air outlet hole or the air inlet hole of the gasification furnace, and the gas transmission device can output coal gas in the gasification furnace or inject a gasification agent into the gasification furnace, so that the normal operation of the underground coal gasification process and the well mouth filling are simultaneously carried out, the normal and stable operation of the gasification furnace is further ensured, and the components of the outlet coal gas cannot be greatly changed.
Description
Technical Field
The invention relates to the technical field of coal gasification, in particular to a coal underground gasification filling wellhead device.
Background
The underground coal gasification technology is a process of burning coal buried underground and generating combustible gas through the thermal action and chemical action of the coal. The underground coal gasification technology changes the traditional physical coal mining into chemical coal mining, replaces the traditional processes of well building, coal mining and ground gasification, and has the advantages of good safety, less investment, high benefit, less pollution and the like.
The main factor for restricting the large-scale industrialization of underground coal gasification is the difficulty in keeping the stability of the components of the outlet gas. Namely, as the gasification reaction is continuously carried out, the combustion space area is larger and larger, the stratum pressure on the coal seam roof is also larger and larger, when the pressure reaches a certain degree, the coal seam roof collapses, water in the stratum enters the gasification furnace, pollutants in the gasification furnace pollute the underground water, meanwhile, the components of the outlet coal gas are greatly changed, and even the gasification reaction cannot be continuously carried out. Therefore, when the coal seam roof collapses, the well mouth needs to be filled in time, but at the moment, the underground coal gasification process may be running, and at present, the well mouth cannot be filled when the process is normally running.
Disclosure of Invention
In view of the above, the invention provides a wellhead filling device for underground coal gasification, and aims to solve the problem that a wellhead cannot be filled when an underground coal gasification process normally operates at present.
In one aspect, the invention provides a coal underground gasification filling wellhead device. The device includes: the device comprises a first injection device, a second injection device and a gas transmission device; wherein, the first injection device is communicated with the gasification furnace; the second injection device is communicated with the first injection device and is used for injecting the filling medium into the gasification furnace through the first injection device; the gas transmission device is communicated with the first injection device and is used for outputting coal gas through the first injection device or injecting a gasifying agent into the gasification furnace.
Further, in the above-mentioned underground coal gasification filling wellhead assembly, the second injection device includes: a first injection hopper and a second injection hopper; the first injection hopper is communicated with the second injection hopper through a first injection pipeline, and the second injection hopper is communicated with the first injection device; the first injection pipeline is provided with a vent pipeline and a first balance pipeline which are respectively communicated with the first injection pipeline, and the first balance pipeline is communicated with the gasification furnace through a first injection device.
Further, in the above coal underground gasification filling wellhead assembly, the first injection pipeline is provided with a first valve, and the position where the emptying pipeline is communicated with the first injection pipeline and the position where the first balance pipeline is communicated with the first injection pipeline are both located between the first valve and the second injection hopper.
Furthermore, in the underground coal gasification filling wellhead device, the volume of the second injection hopper is larger than or equal to that of the first injection hopper.
Further, among the above-mentioned coal underground gasification well head device of filling, gas transmission device includes: a temperature detector, a flow detector and a first pressure detector; the temperature detector, the flow detector and the first pressure detector are all arranged on the gas transmission pipeline; the first end of the gas pipeline is communicated with the first injection device or the second end of the gas pipeline is communicated with the first injection device.
Further, in the above-mentioned underground coal gasification well head device that fills, the gas transmission pipeline includes: a first gas delivery pipe and a second gas delivery pipe; the first end of the first air pipe is communicated with the first air transmission port of the flow detector, and the first end of the second air pipe is communicated with the second air transmission port of the flow detector; the second end of the first gas pipe is communicated with the first injection device or the second end of the second gas pipe is communicated with the first injection device; the temperature detector is arranged on the first air conveying pipe, and the first pressure detection device is arranged on the second air conveying pipe.
Further, in the above coal underground gasification filling wellhead assembly, the distance between the second end of the first gas transmission pipe and the first gas transmission port is more than or equal to 10 times of the drift diameter of the first gas transmission pipe.
Further, in the above coal underground gasification filling wellhead assembly, the distance between the second end of the second gas transmission pipe and the second gas transmission port is more than or equal to 20 times of the drift diameter of the second gas transmission pipe.
Further, in the above-mentioned underground coal gasification filling wellhead assembly, the first injection device includes: a second injection conduit, a second balance conduit and a second pressure detector; the first end of the second injection pipeline is communicated with the second injection hopper, and the second end of the second injection pipeline is arranged in the gasification furnace and communicated with the gasification furnace; the first end of the second balance pipeline is communicated with the second injection pipeline, and the second end of the second balance pipeline is communicated with the first balance pipeline; the second pressure detector is disposed in the second injection line.
Further, in the underground coal gasification filling wellhead device, the second injection pipeline is provided with a second valve, and the position where the first end of the second balance pipeline is communicated with the second injection pipeline is located between the second valve and the gasification furnace.
Further, in the underground coal gasification and filling wellhead device, the position where the second pressure detector is communicated with the second injection pipeline is located between the position where the first end of the second balance pipeline is communicated with the second injection pipeline and the gasification furnace.
According to the invention, the second injection device and the gas transmission device are both communicated with the gasification furnace through the first injection device, the second injection device can inject a filling medium into the gas outlet hole or the gas inlet hole of the gasification furnace, and the gas transmission device can output the coal gas in the gasification furnace or inject a gasification agent into the gasification furnace, so that the filling of the medium and the gas transmission can be simultaneously carried out, namely, the wellhead can be filled while the underground coal gasification process is normally operated, and the normal and stable operation of the gasification furnace is further ensured, so that the components of the outlet coal gas can not be greatly changed.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a coal underground gasification filling wellhead device provided by an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a preferred structure of the underground coal gasification filling wellhead device provided by the embodiment is shown. As shown, the apparatus may include: a first injection device 1, a gas transmission device 3 and a second injection device 2.
The first injection device 1 may be disposed above the gasification furnace 4 (with respect to fig. 1), and is communicated with the gasification furnace 4. In specific implementation, the position of the first injection device 1 is fixed relative to the position of the gasification furnace 4, and the first injection device 1 may be communicated with an air inlet of the gasification furnace 4, or may be communicated with an air outlet of the gasification furnace 4, which may be specifically selected according to filling requirements.
The second injection device 2 may be arranged above (with respect to fig. 1) the first injection device 1 and may be in detachable communication with the first injection device 1, for example bolted or flanged. The second injection device 2 is communicated with the gasification furnace 4 through the first injection device 1 to inject the filling medium into the gasification furnace 4, that is, when the filling medium needs to be injected into the gasification furnace 4, the second injection device 2 can be installed on the first injection device 1 and is communicated with the first injection device 1; when the filling medium is not required to be injected into the gasification furnace 4 or after the injection is completed, the second injection device 2 can be detached for recycling. In particular, the filling medium may be a slurry.
The gas transmission device 3 may be disposed at a side of the first injection device 1 (with respect to fig. 1), and detachably communicate with the first injection device 1, such as by bolting or flange connection, so as to realize recycling of the gas transmission device 3. If the air outlet needs to be filled, the gas transmission device 3 can output the coal gas generated in the gasification furnace 4 through the first injection device 1; if it is an air inlet hole to be filled, the gas transmission device 3 can inject the gasifying agent into the gasification furnace 4 through the first injection device 1.
It should be noted that, if the gasification furnace has a plurality of air inlets and one air outlet, the underground coal gasification filling wellhead device provided by the embodiment can only be arranged on the air inlets; if the gasification furnace is provided with one air inlet hole and a plurality of air outlet holes, the underground coal gasification filling wellhead device provided by the embodiment can only be arranged at the air outlet holes.
In this embodiment, second injection device 2 and gas transmission device 3 all are linked together through first injection device 1 and gasifier 4, second injection device 2 can pour into the packing medium into the venthole or the inlet port of gasifier 4, gas transmission device 3 can be with the coal gas output in gasifier 4 or with the gasification agent injection gasifier 4 in, this makes the packing of medium and gaseous transport go on simultaneously, can be in order to realize in the underground coal gasification technology normal operating, fill the well head, and then guaranteed the normal steady operation of gasifier 4, thereby make the component of export coal gas can not take place very big change.
In the above embodiment, the second injection device 2 may include: a first hopper 21 and a second hopper 22. The first injection hopper 21 is a normal pressure hopper, and can be communicated with the second injection hopper 22 through a first injection pipeline 23, the second injection hopper 22 is a pressure swing hopper, and the second injection hopper 22 is detachably communicated with the first injection device 1, such as by bolts or flanges. In specific implementation, the volume of the second injection hopper 22 may be greater than or equal to the volume of the first injection hopper 21. The first filling pipe 23 may be provided with a first valve 26, the lower end (with respect to fig. 1) of the second filling funnel 22 may be provided with a third valve 27, the first flange 15 may be provided at a position where the first filling device 1 communicates with the second filling funnel 22, and the second filling device 2 and the first filling device 1 may be detachably connected through the third valve 27 and the first flange 15. The first injection pipe 23 is provided with a vent pipe 24 and a first balance pipe 25 respectively communicated with the first injection pipe 23, in specific implementation, a position where the vent pipe 24 is communicated with the first injection pipe 23 and a position where the first balance pipe 25 is communicated with the first injection pipe 23 may be oppositely arranged, and a position where the vent pipe 24 is communicated with the first injection pipe 23 and a position where the first balance pipe 25 is communicated with the first injection pipe 23 may be located between the first valve 26 and the second injection hopper 22. The vent line 24 may be provided with a vent valve 28. The first balance duct 25 may be detachably communicated with the first injection device 1, for example, bolted or flanged, such that the first balance duct 25 is communicated with the gasification furnace 4 through the first injection device 1. In practical implementation, a lower end (with respect to fig. 1) of the first balance pipeline 25 may be provided with a balance flange 29, a balance valve 16 may be provided at a position where the first injection device 1 communicates with the first balance pipeline 25, and the first balance pipeline 25 and the first injection device 1 may be detachably connected through the balance flange 29 and the balance valve 16.
In this embodiment, the pressure in the gasification furnace 4 can be the same as the pressure in the second injection hopper 22 through the first balance pipe 25, so that the filling medium can smoothly fall into the gasification furnace 4, and at this time, the second injection hopper 22 is pressurized, so that the pressure in the second injection hopper 22 can be the same as the pressure in the first injection hopper 21 by opening the atmospheric valve 28 to ensure that the filling medium in the first injection hopper 21 smoothly falls into the second injection hopper 22, so that the filling medium can smoothly fall.
In the above embodiment, the gas transmission device 3 may include: a temperature detector 31, a flow rate detector 32, and a first pressure detector 33. The temperature detector 31, the flow detector 32 and the first pressure detector 33 may be disposed in the gas transmission pipeline 34 to detect the temperature, the flow and the pressure of the gas in the gas transmission pipeline 34, respectively. A first end (left end shown in fig. 1) of the gas delivery pipe 34 communicates with the first injection device 1, or a second end (right end shown in fig. 1) of the gas delivery pipe 34 communicates with the first injection device 1. In specific implementation, the first pressure detector 33, the flow detector 32 and the temperature detector 31 may be sequentially disposed along a direction from the second end to the first end of the gas transmission pipeline 34, that is, sequentially disposed along the gas transmission direction, that is, when the gas transmission pipeline 34 transmits the gasifying agent into the gasification furnace 4, the first end of the gas transmission pipeline 34 is communicated with the first injection device 1, and when the gas transmission pipeline 34 outputs the coal gas, the second end of the gas transmission pipeline 34 is communicated with the first injection device 1, so as to ensure that the transmitted gas firstly passes through the first pressure detector 33, and further ensure the accuracy of the pressure detection.
In the above embodiment, the gas transmission pipeline 34 may include: a first air delivery conduit 341 and a second air delivery conduit 342. Wherein a first end (right end shown in fig. 1) of the first air pipe 341 can communicate with the first air transmission port 321 of the flow detector 32, and a first end (left end shown in fig. 1) of the second air pipe 342 can communicate with the second air transmission port 322 of the flow detector 32. The second end (left end as viewed in FIG. 1) of the first air delivery conduit 341 may be removably communicated with the first injection device 1, or the second end (right end as viewed in FIG. 1) of the second air delivery conduit 342 may be removably communicated with the first injection device 1, such as by bolting or flanging. In specific implementation, the second end of the first gas pipe 341 or the second end of the second gas pipe 342 may be provided with a shut-off valve 35, the position where the first injection device 1 is communicated with the second end of the first gas pipe 341 or the position where the first injection device 1 is communicated with the second end of the second gas pipe 342 may be provided with a second flange 17, and the detachable connection of the first gas pipe 341 and the first injection device 1 or the detachable connection of the second gas pipe 342 and the first injection device 1 may be realized by the shut-off valve 35 and the second flange 17. The temperature detector 31 may be disposed in the first gas delivery conduit 341 and the first pressure detector 33 may be disposed in the second gas delivery conduit 342. Of course, in specific implementation, both the temperature detector 31 and the first pressure detector 33 may be disposed in the second air delivery pipe 342, and the length of the second air delivery pipe 342 is longer than that in the case where the temperature detector 31 is disposed in the first air delivery pipe 341 and the first pressure detector 33 is disposed in the second air delivery pipe 342.
In the above embodiment, the distance between the second end of the first air pipe 341 and the first air transmission port 321 may be greater than or equal to 10 times the diameter of the first air pipe 341, and the distance between the second end of the second air pipe 342 and the second air transmission port 322 may be greater than or equal to 20 times the diameter of the second air pipe 342, so that the indication number of the flow rate detector 32 is stable, and the smooth air transmission is ensured.
In the above embodiment, the first injection device 1 includes: a second injection line 11, a second balancing line 12 and a second pressure detector 13. Wherein a first end (an upper end as shown in fig. 1) of the second injection pipe 11 may be detachably communicated with the second injection hopper 22, for example, bolted or flanged. In particular, the first flange 15 may be disposed at a first end of the second injection pipe 11. The second end of the second injection pipe 11 is disposed inside the gasification furnace 4 and communicates with the gasification furnace 4 to fill the filling medium into the gasification furnace 4. A first end (a lower end shown in fig. 1) of the second balance duct 12 may be in communication with the second injection duct 11, and a second end (an upper end shown in fig. 1) of the second balance duct 12 may be in detachable communication, such as bolted or flanged, with a lower end of the first balance duct 25. In particular implementations, the equalization valve 16 may be disposed at the second end of the second equalization conduit 12. A second pressure detector 13 may be provided to the second injection pipe 11 to detect the pressure within the second injection pipe 11. In a specific implementation, the second injection pipe 11 may be provided with a second valve 14, a position where the first end of the second balance pipe 12 communicates with the second injection pipe 11 may be located between the second valve 14 and the gasification furnace 4, and a position where the second pressure detector 13 communicates with the second injection pipe 11 may be located between a position where the first end of the second balance pipe 12 communicates with the second injection pipe 11 and the gasification furnace 4.
The operation of the gas transmission device 3 will be described in detail below by taking the example of inputting a gasifying agent into the gasification furnace 4:
when the underground coal gasification process is in normal operation, the balance valve 16 is in a closed state, the blind plate is installed opposite to the balance flange 29, the stop valve 35 and the second valve 14 are both in an open state, and the gasification agent sequentially passes through the gas transmission device 3 and the first injection device 1 to enter the underground gasification furnace 4 and then reacts with underground coal.
First, the individual components of the second injection device 2 are connected according to fig. 1 to form an organic unit, and when it is necessary to fill the gasification furnace 4 with the medium, the shut-off valve 35 and the second valve 14 are closed, the blind plate opposite the counter-balance flange 29 is removed, and the second injection device 2 is mounted on the first injection device 1, so that the counter-balance flange 29 is firmly connected to the counter-balance valve 16, and the third valve 27 is firmly connected to the first flange 15.
Then, the first valve 26 and the third valve 27 are closed, the atmospheric valve 28 is opened, and after a set volume of the filling medium is charged into the first hopper 21, the first valve 26 is opened to allow the filling medium to enter the second hopper 22. After the filling medium completely enters the second injection hopper 22, the first valve 23 and the emptying valve 28 are closed, then the balance valve 16 is opened to enable the pressure of the second injection hopper 22 to be close to the pressure of the underground gasification furnace 4, and after the second injection hopper 22 is stabilized for 5 minutes, the third valve 27 and the second valve 14 are opened to enable the filling medium in the second injection hopper 22 to enter the underground gasification furnace 4.
By repeatedly performing the above processes, the filling medium can be gradually filled into the underground gasification furnace 4 until the requirements are met. After the filling task is completed, the balancing valve 16, the second valve 14 and the shut-off valve 35 may be closed, a blind plate may be installed opposite the balancing flange 29, and then the second injection device 2 may be removed for use in other well heads requiring filling, while the second valve 14 and the shut-off valve 35 may be opened to perform other processes.
If the gas output by the gas transmission device 3 is coal gas, the left end and the right end of the gas transmission pipeline 34 are exchanged, and other operations are the same as the above operations and are not described again.
In conclusion, in this embodiment, the second injection device and the gas transmission device are both communicated with the gasification furnace through the first injection device, the second injection device can inject the filling medium into the gas outlet or the gas inlet of the gasification furnace, and the gas transmission device can output the coal gas in the gasification furnace or inject the gasifying agent into the gasification furnace, so that the filling of the medium and the gas transmission can be simultaneously performed, that is, the wellhead can be filled while the underground coal gasification process is normally operated, and the normal and stable operation of the gasification furnace is further ensured, so that the components of the outlet coal gas cannot be greatly changed.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A coal underground gasification filling wellhead device is characterized by comprising: the device comprises a first injection device (1), a second injection device (2) and a gas transmission device (3); wherein the content of the first and second substances,
the first injection device (1) is communicated with the gasification furnace (4);
the second injection device (2) is communicated with the first injection device (1) and is used for injecting a filling medium into the gasification furnace (4) through the first injection device (1);
the gas transmission device (3) is communicated with the first injection device (1) and is used for outputting coal gas through the first injection device (1) or injecting a gasifying agent into the gasification furnace (4);
the second injection device (2) comprises: a first injection hopper (21) and a second injection hopper (22); wherein the content of the first and second substances,
the first injection hopper (21) is communicated with the second injection hopper (22) through a first injection pipeline (23), and the second injection hopper (22) is communicated with the first injection device (1);
the first injection pipeline (23) is provided with a vent pipeline (24) and a first balance pipeline (25) which are respectively communicated with the first injection pipeline, and the first balance pipeline (25) is communicated with the gasification furnace (4) through the first injection device (1);
the first injection pipeline (23) is provided with a first valve (26), and the position of the emptying pipeline (24) communicated with the first injection pipeline (23) and the position of the first balance pipeline (25) communicated with the first injection pipeline (23) are both positioned between the first valve (26) and the second injection hopper (22);
the first injection device (1) comprises: a second injection conduit (11), a second balancing conduit (12) and a second pressure detector (13); wherein, the first and the second end of the pipe are connected with each other,
the first end of the second injection pipeline (11) is communicated with the second injection hopper (22), and the second end of the second injection pipeline (11) is arranged in the gasification furnace (4) and communicated with the gasification furnace (4);
a first end of the second balancing duct (12) communicates with the second injection duct (11), a second end of the second balancing duct (12) communicates with the first balancing duct (25);
the second pressure detector (13) is provided to the second injection pipe (11).
2. The underground coal gasification filling wellhead assembly according to claim 1,
the volume of the second injection hopper (22) is greater than or equal to the volume of the first injection hopper (21).
3. An underground coal gasification filling wellhead device according to claim 1, characterized in that the gas transmission device (3) comprises: a temperature detector (31), a flow rate detector (32), and a first pressure detector (33); wherein, the first and the second end of the pipe are connected with each other,
the temperature detector (31), the flow detector (32) and the first pressure detector (33) are all arranged on a gas transmission pipeline (34);
the first end of the gas transmission pipeline (34) is communicated with the first injection device (1) or the second end of the gas transmission pipeline (34) is communicated with the first injection device (1).
4. A coal underground gasification filling wellhead assembly according to claim 3, characterized in that the gas transmission pipeline (34) comprises: a first air delivery conduit (341) and a second air delivery conduit (342); wherein, the first and the second end of the pipe are connected with each other,
the first end of the first air pipe (341) is communicated with the first air transmission port (321) of the flow detector (32), and the first end of the second air pipe (342) is communicated with the second air transmission port (322) of the flow detector (32);
the second end of the first air conveying pipe (341) is communicated with the first injection device (1) or the second end of the second air conveying pipe (342) is communicated with the first injection device (1);
the temperature detector (31) is arranged on the first air conveying pipe (341), and the first pressure detector is arranged on the second air conveying pipe (342).
5. The underground coal gasification filling wellhead device according to claim 4,
the distance between the second end of the first air pipe (341) and the first air transmission port (321) is more than or equal to 10 times of the drift diameter of the first air pipe (341).
6. The underground coal gasification filling wellhead device according to claim 4,
the distance between the second end of the second air conveying pipe (342) and the second air conveying port (322) is more than or equal to 20 times of the drift diameter of the second air conveying pipe (342).
7. The underground coal gasification filling wellhead device according to claim 1,
the second injection pipeline (11) is provided with a second valve (14), and the position where the first end of the second balance pipeline (12) is communicated with the second injection pipeline (11) is located between the second valve (14) and the gasification furnace (4).
8. The underground coal gasification filling wellhead assembly according to claim 7,
the position of the second pressure detector (13) communicated with the second injection pipeline (11) is positioned between the position of the first end of the second balance pipeline (12) communicated with the second injection pipeline (11) and the gasification furnace (4).
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| CN201710666956.9A CN107269256B (en) | 2017-08-07 | 2017-08-07 | Underground coal gasification filling wellhead device |
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| CN201710666956.9A CN107269256B (en) | 2017-08-07 | 2017-08-07 | Underground coal gasification filling wellhead device |
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| CN102748002A (en) * | 2012-07-26 | 2012-10-24 | 新奥气化采煤有限公司 | Method for extinguishing underground gasification furnace of coal |
| RU2526953C1 (en) * | 2013-05-31 | 2014-08-27 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тульский государственный университет" (ТулГУ) | Method of comprehensive development brown coal deposits |
| CN103277082B (en) * | 2013-06-21 | 2015-10-28 | 河南中矿科能煤业化工有限公司 | A kind of injection point backing formula underground coal gasification system and technique |
| BG66748B1 (en) * | 2013-11-12 | 2018-10-31 | Атанасов Ковачки Христо | Method and device for single-borehole subterranean gasification of fossil fuels |
| CN103742122B (en) * | 2014-01-28 | 2017-09-19 | 新奥科技发展有限公司 | Underground coal gasification system and gasification process |
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