CN207739991U

CN207739991U - Underground gasification furnace

Info

Publication number: CN207739991U
Application number: CN201721233892.5U
Authority: CN
Inventors: 徐斌; 郑林; 张树川; 杜慧华; 徐军
Original assignee: Xinjiang Guoli Clean Energy Technology Co Ltd
Current assignee: Xinjiang Guoli Clean Energy Technology Co Ltd
Priority date: 2017-09-22
Filing date: 2017-09-22
Publication date: 2018-08-17
Anticipated expiration: 2027-09-22

Abstract

The utility model provides a kind of underground gasification furnace, which includes：Vertical shaft and horizontal orientation hole；Wherein, the first end of vertical shaft is connected with ground, and the second end of vertical shaft is placed in coal seam；The first end in horizontal orientation hole is connected with ground, and the second end in horizontal orientation hole is placed in coal seam and is connected with the second end of vertical shaft, and horizontal orientation hole generates reaction gas for carrying out coal gasification reaction；Vertical shaft is for conveying reaction gas.In the utility model, using horizontal orientation hole as aerogenesis channel, gasification is stablized, it is easily controllable, convenient for construction, using vertical shaft as gas distribution channel, can more preferably, more convey reaction gas, gas transmission, which is concentrated, stablizes, and, the second end of vertical shaft more more stable and stronger and the second end in horizontal orientation hole and the second end of vertical shaft are connected, simple in structure, it is short to build the stove period, it is cost-effective so that underground gasification furnace is safer, stablizes, and realizes to the efficient, stable, lasting of underground coal resources, clean mining.

Description

Underground gasification furnace

Technical Field

The utility model relates to an underground gasification technical field particularly, relates to an underground gasification stove.

Background

Coal underground gasification is a chemical coal mining method which converts high molecular coal into low molecular fuel gas at high temperature in situ underground and conveys the low molecular fuel gas to the surface. Underground coal gasification is mainly realized by a gasification furnace arranged underground, but because the gasification furnace is built in an underground coal seam, compared with a ground gasification furnace, the gas making process of the underground coal gasification increases a lot of complexity and uncertainty.

At present, underground coal gasification furnaces mainly comprise a non-well type and a well type. The shaft-free gasifier mainly utilizes geological drilling holes for gasification, and has the advantages of relatively stable gasification process, easy control and short furnace building period, and can be used for gasifying coal lost at the edges of thin coal beds, deep coal beds, underwater coal beds and coal beds under buildings and small coal mines; the air outlet structure has the disadvantages that a large number of air outlet holes are needed to meet the air outlet requirement, the bottoms of the air outlet holes are extremely unstable and easy to collapse to cause blockage, and meanwhile, multiple times of underground penetration butt joint of the directional holes and the straight holes and short circuit through among the straight holes are needed. The shaft type gasification furnace mainly utilizes the roadway and the horizontal hole for gasification, and has the advantages that the occurrence and the construction condition of a coal bed are controlled in advance, the risk can be avoided, the furnace construction is facilitated, the gas output is high, and the original partial underground tunnel can be utilized, so that the investment is saved to a certain extent; the method has the disadvantages that the whole furnace building process is underground operation, the furnace building period is long, the investment cost is high, and the safety requirement is high. Therefore, the existing underground coal gasification furnace has various advantages and disadvantages, and cannot realize rapidness, safety and stability.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an underground gasification stove aims at solving the unable quick, safe, stable problem of realization of the underground coal gasification stove among the prior art.

The utility model provides an underground gasification stove, this underground gasification stove includes: a vertical shaft and a horizontally oriented bore; wherein, the first end of the vertical shaft is connected with the ground, and the second end of the vertical shaft is arranged in the coal seam; the first end of the horizontal directional hole is connected with the ground, the second end of the horizontal directional hole is arranged in the coal seam and communicated with the second end of the vertical shaft, and the horizontal directional hole is used for carrying out coal gasification reaction to generate reaction gas; the shaft is used for conveying reaction gas.

Further, the underground gasification furnace further includes: a roadway; the roadway is arranged in the coal seam and is communicated with the second end of the vertical shaft; and the second end of the horizontal directional hole is communicated with a tunnel, and the tunnel is used for receiving the reaction gas generated in the horizontal directional hole and conveying the reaction gas to the vertical shaft.

Further, the underground gasification furnace further includes: supporting a protecting wall; the lateral wall of the tunnel corresponding to the horizontal directional hole is provided with an opening, the support wall is arranged at the opening and provided with a communication hole used for communicating the horizontal directional hole with the tunnel and conveying reaction gas generated in the horizontal directional hole into the tunnel.

Further, the underground gasification furnace further includes: the first connecting pipe is arranged in the roadway, and the second connecting pipe is arranged in the shaft; the first end of the first connecting pipe is connected with the communication hole, and the second end of the first connecting pipe is connected with the second connecting pipe; the first connecting pipe is used for conveying the reaction gas conveyed by the communicating hole to the second connecting pipe; the second connecting pipe is used for conveying the reaction gas to the ground.

Furthermore, in the underground gasification furnace, at least two horizontal directional holes are arranged, the first end of each horizontal directional hole is connected with the ground, and the second end of each horizontal directional hole is communicated with the roadway.

Furthermore, in the underground gasification furnace, the number of the horizontal directional holes is even, and the horizontal directional holes are respectively arranged on two sides of the roadway and are symmetrically arranged relative to the roadway.

Furthermore, in the underground gasification furnace, a supporting layer is arranged at the top of the roadway.

Further, in the underground gasification furnace, a reinforcing device is arranged on the side wall of the roadway.

Furthermore, in the underground gasification furnace, the roadway is arranged along the main crack direction of the coal bed; the second end of the horizontally oriented hole is perpendicular to the roadway.

Furthermore, in the underground gasification furnace, a supporting device is arranged on the inner wall of the vertical shaft.

The utility model discloses in, regard horizontal directional hole as the gas production passageway, gasification process is stable, easy control, be convenient for construct, the construction time is short, regard the shaft as gas transmission passageway, can be better, carry reaction gas more, need not to set up a large amount of ventholes, gas transmission concentrates stably, and, the second end of shaft is more firm stable, the phenomenon of jam caused by the current no well gasifier collapsing easily has been avoided, and the second end of horizontal directional hole is linked together with the second end of shaft, moreover, the steam generator is simple in structure, the construction cycle is short, save cost, make underground gasifier safer, stable, the problem that coal underground gasifier among the prior art can't realize fast, safety, stability has been solved, high efficiency, stability, continuation, clean exploitation to underground coal resources has been realized; in addition, a large amount of land is not required to be occupied, the environment is protected, and the damage of ecological balance is avoided.

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 an underground gasification furnace provided by an embodiment of the present invention;

fig. 2 is a schematic top view of an underground gasification furnace according to an embodiment of the present invention;

3 FIG. 3 3 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 the 3 line 3 A 3- 3 A 3 in 3 FIG. 3 1 3; 3

Fig. 4 is a schematic cross-sectional view taken along the direction B-B in fig. 1.

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, in the present invention, 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 accompanying drawings in conjunction with embodiments.

Referring to fig. 1 to 4, preferred structures of an underground gasification furnace provided by an embodiment of the present invention are shown. As shown, the underground gasification furnace may include: a shaft 1 and a horizontally oriented bore 2. Wherein, the first end (the upper end shown in fig. 1) of the shaft 1 is connected with the ground, and the second end (the lower end shown in fig. 1) of the shaft 1 is arranged in the coal seam, i.e. the shaft 1 penetrates into the coal seam from the ground. Specifically, the second end of the shaft 1 is placed at the floor of the coal seam. The shaft 1 has a preset diameter which can be determined according to practical situations, and the embodiment does not limit the diameter. In this embodiment the diameter of the shaft 1 is 6-8 m.

In specific implementation, the shaft 1 may be set on site according to actual conditions, or an existing resource may be used as the shaft 1, which is not limited in this embodiment.

The first end (the upper end shown in fig. 1) of the horizontal directional hole 2 is connected with the ground, and the second end (the lower end shown in fig. 1) of the horizontal directional hole 2 is placed in the coal seam, i.e. the horizontal directional hole 2 penetrates into the coal seam from the ground. The horizontally oriented bore 2 includes: the horizontal directional hole 2 comprises a vertical section, an oblique stabilizing section and a horizontal section, wherein the first end of the vertical section of the horizontal directional hole 2 is connected with the ground, and the second end of the vertical section is connected with the horizontal section through the oblique stabilizing section.

The second end of the horizontal directional hole 2 is communicated with the second end of the vertical shaft 1, and the horizontal directional hole 2 is used for carrying out coal gasification reaction to generate reaction gas. In particular, the horizontal section of the horizontally oriented bore 2 communicates with the second end of the shaft 1. And conveying a gasifying agent into the horizontal directional hole 2 from the first end of the horizontal directional hole 2, and carrying out coal gasification reaction on the gasifying agent and the coal bed to generate reaction gas.

In specific implementation, a preset distance is provided between the first end of the horizontal directional hole 2 and the first end of the shaft 1, that is, a preset distance is provided between the vertical section of the horizontal directional hole 2 and the shaft 1, the preset distance is used for enabling the gasification agent in the horizontal section of the horizontal directional hole 2 to better perform coal gasification reaction with the coal seam, and the preset distance can be determined according to actual conditions, and the embodiment does not limit the distance.

During specific implementation, gasification agent conveying equipment can be arranged in the horizontal directional hole 2 and used for conveying gasification agents into the horizontal directional hole 2.

Since the second end of the shaft 1 communicates with the second end of the horizontally oriented hole 2, the shaft 1 serves to receive the reaction gas generated in the horizontally oriented hole 2 and to transmit the reaction gas to the ground through the first end of the shaft 1.

In specific implementation, the number of the horizontal directional holes 2 is at least two, each horizontal directional hole 2 penetrates through the coal seam from the ground, the second end of each horizontal directional hole 2 is communicated with the second end of the vertical shaft 1, each horizontal directional hole 2 is used for performing coal gasification reaction to generate reaction gas, the second end of the vertical shaft 1 is used for receiving the reaction gas generated in each horizontal directional hole 2, and the first end of the vertical shaft 1 is used for conveying the reaction gas to the ground. Preferably, the horizontally oriented holes 2 are evenly distributed along the circumference of the second end of the shaft 1.

During operation, the gasifying agent is conveyed into the horizontal directional holes 2 from the first ends of the horizontal directional holes 2, the gasifying agent and the coal bed are subjected to coal gasification reaction to generate reaction gas, and the reaction gas is conveyed into the vertical shaft 1 through the second ends of the horizontal directional holes 2 and is output to the ground through the vertical shaft 1.

It can be seen that in the embodiment, the horizontal directional hole 2 is used as a gas production channel, the gasification process is stable, easy to control, convenient to construct and short in construction time, the vertical shaft 1 is used as a gas transmission channel, reaction gas can be better and more conveyed, a large number of gas outlet holes are not needed to be arranged, the gas transmission is centralized and stable, the second end of the vertical shaft 1 is firmer and more stable, the phenomenon that the existing shaft-free gasifier is easy to collapse and cause blockage is avoided, the second end of the horizontal directional hole 2 is communicated with the second end of the vertical shaft 1, the structure is simple, the furnace construction period is short, the cost is saved, the underground gasifier is safer and more stable, the problem that the underground coal gasifier in the prior art cannot realize quick, safe and stable exploitation of underground coal resources is realized, and efficient, stable, continuous and clean exploitation of the underground coal; in addition, a large amount of land is not required to be occupied, the environment is protected, and the damage of ecological balance is avoided.

Referring to fig. 1 to 4, in the above embodiment, the underground gasification furnace may further include: and (3) a roadway. Wherein, tunnel 3 sets up in the coal seam, has preset space in the tunnel 3, and then the inside in tunnel 3 forms a confined space. The cross-sectional shape of the predetermined space may be square, circular, etc., which is not limited in this embodiment. The lane 3 has a preset length, which can be determined according to actual conditions, and this embodiment does not limit this.

In this embodiment, the cross-sectional shape of the preset space of the roadway 3 is a square, so that the roadway 3 is disposed in a rectangular shape, the height of the roadway 3 may be the thickness of the coal seam, and the width of the roadway 3 may be 10-12 m.

The second end of the horizontally oriented hole 2 communicates with the tunnel 3 and the tunnel 3 communicates with the second end of the shaft 1, i.e. the second end of the horizontally oriented hole 2 communicates with the second end of the shaft 1 through the tunnel 3. The tunnel 3 is used for receiving the reaction gas generated in the horizontally oriented holes 2 and conveying the reaction gas to the vertical shaft 1, and the vertical shaft 1 conveys the reaction gas to the ground.

During specific implementation, the communication position of the second end of the horizontal directional hole 2 and the roadway 3 can be realized through an opening, and a supporting structure and a sealing structure are arranged at the communication position. The supporting structure is used for enabling the communication position of the second end of the horizontal directional hole 2 and the roadway 3 to be more stable and avoiding collapse; the sealing structure is used for avoiding leakage of reaction gas. The communication between the roadway 3 and the second end of the shaft 1 can be realized by opening a hole, and a supporting structure and a sealing structure are arranged at the communication, wherein the supporting structure is used for enabling the communication between the roadway 3 and the second end of the shaft 1 to be more stable and avoiding collapse; the sealing structure is used for avoiding leakage of reaction gas.

In specific implementation, a preset distance is provided between the second end of the horizontally oriented hole 2 and the bottom of the roadway 3, and the preset distance can be determined according to actual conditions, which is not limited in this embodiment. In the present embodiment, the distance between the second end of the horizontally oriented hole 2 and the bottom of the roadway 3 is 0.5-1m, i.e. the distance between the horizontal section of the horizontally oriented hole 2 and the bottom of the roadway 3 is 0.5-1 m.

The tunnel 3 can use the shaft 1 as the center, sets up along the main crack direction in coal seam to make tunnel 3 more stable in the coal seam, ensure the safe work in tunnel 3. The second end of the horizontal directional hole 2 is vertical to the roadway 3, that is, the horizontal section of the horizontal directional hole 2 is vertical to the roadway 3, so that the gasification agent in the horizontal directional hole 2 can better perform coal gasification reaction with the coal seam.

It can be seen that, in this embodiment, through setting up tunnel 3, reactant gas in the horizontal orientation hole 2 is carried to shaft 1 through tunnel 3, is convenient for reactant gas to carry in the shaft 1, avoids reactant gas to pile up in the second end department of horizontal orientation hole 2, has ensured reactant gas's stable transport.

Referring to fig. 2 to 4, in the above embodiment, the underground gasification furnace may further include: supporting the wall 4. The side wall of the roadway 3 corresponding to the position of the horizontal directional hole 2 is provided with an opening, the supporting wall 4 is arranged at the opening, the supporting wall 4 is provided with a communication hole 41, the communication hole 41 is used for communicating the horizontal directional hole 2 with the roadway 3, and the reaction gas generated in the horizontal directional hole 2 is conveyed into the roadway 3. Specifically, the lateral wall of tunnel 3 has seted up the opening in the position department that corresponds to the second end of horizontal directional hole 2, sets up buttress wall 4 in the opening, and buttress wall 4 is used for consolidating the intercommunication department of this tunnel 3 and horizontal directional hole 2 for this opening part is firm stable, avoids appearing the collapse phenomenon at the opening part. The support wall 4 is of an integral closed structure, and in order to enable the horizontal directional hole 2 to be communicated with the roadway 3, a communication hole 41 is formed in the support wall 4 corresponding to the horizontal directional hole 2.

In practical implementation, there may be at least two communication holes 41, each communication hole 41 is located on the supporting wall 4 corresponding to the horizontally oriented hole 2, and the communication holes 41 are uniformly distributed.

In specific implementation, the roadway 3 may also be provided with an opening integrally formed with the side wall of the horizontally oriented hole 2. That is, an opening may be formed in the entire side wall of the tunnel 3 corresponding to the horizontally oriented hole 2, so that the height of the opening is the same as the height of the tunnel 3, and the width of the opening is matched with the width of the horizontally oriented hole 2, so that the opening corresponds to the horizontally oriented hole 2. At this time, the support wall 4 is provided at the opening, and the communication hole 41 is on the support wall 4 and corresponds to the horizontally oriented hole 2, so that the communication hole 41 functions to communicate the horizontally oriented hole 2 with the tunnel 3. Alternatively, the opening may be formed only in the side wall of the roadway 3 corresponding to the horizontally oriented hole 2, and the opening may be matched with the cross-sectional dimension of the horizontally oriented hole 2, and at this time, the support wall 4 may be provided at the opening, and the communication hole 41 may be formed in the support wall 4.

During the concrete implementation, the supporting wall 4 can be any structure as long as the supporting wall 4 can play a role in reinforcing the opening of the roadway 3, and the structure of the supporting wall 4 is not limited in this embodiment. In this embodiment, a steel bracket is installed in the opening, and the opening is filled with high-temperature resistant concrete through a reinforcing bar, and airtight support is performed to form a support wall 4.

In specific implementation, the size of the opening may be determined according to actual conditions, and this embodiment does not limit this. In this embodiment, the opening has a length of 3-5m and a width of 6-8 m. The communication hole 41 may be circular or square, and the shape of the communication hole 41 is not limited in this embodiment. In the present embodiment, the communication hole 41 is circular. The size of the communication hole 41 may be determined according to actual conditions, and the present embodiment does not limit this. In the present embodiment, the diameter of the communication hole 41 is 300 to 500 mm.

When the coal gasification device works, the gasification agent is conveyed into the horizontal directional hole 2 from the first end of the horizontal directional hole 2, the gasification agent and a coal bed are subjected to coal gasification reaction to generate reaction gas, the reaction gas is conveyed into the roadway 3 through the second end of the horizontal directional hole 2, and the roadway 3 is used as a gas collection channel to collect the reaction gas in the horizontal directional hole 2. The tunnel 3 conveys the reaction gas into the vertical shaft 1 and outputs the reaction gas to the ground from the vertical shaft 1.

It can be seen that, in the embodiment, the opening is arranged at the position of the roadway 3 corresponding to the horizontal directional hole 2, and the support wall 4 is arranged in the opening, so that the communication position of the roadway 3 and the horizontal directional hole 2 can be supported, the reinforcement effect is achieved, the stability of the communication position of the roadway 3 and the horizontal directional hole 2 is ensured, and the safe and stable operation of the underground gasification furnace is further ensured; the communicating hole 41 formed in the supporting wall 4 is used for communicating the horizontal directional hole 2 with the roadway 3, and the structure is simple and easy to implement; in addition, the horizontal directional hole 2 is used as a gas production channel, the roadway 3 is used as a gas collection channel, the vertical shaft 1 is used as a gas transmission channel, the structure is simple, workers do not need to enter the underground gasification furnace, the gasification working surface does not need to be expanded, and the furnace building period and the investment cost are saved.

Referring to fig. 2 to 4, in the above embodiment, the underground gasification furnace may further include: a first connection pipe (not shown) and a second connection pipe (not shown). Wherein, first connecting pipe sets up in tunnel 3, and the second connecting pipe sets up in shaft 1. The first end of the first connecting pipe is connected with the communication hole 41 so that the first connecting pipe communicates with the horizontally oriented hole 2. The second end of the first connecting pipe is arranged at the second end of the shaft 1, the second end of the first connecting pipe is connected with the first end of the second connecting pipe, and the second end of the second connecting pipe is communicated with the ground. The horizontally oriented holes 2 are used for conveying the reaction gas generated by the coal gasification reaction to a first connecting pipe through the communication hole 41, the first connecting pipe is used for receiving the reaction gas conveyed by the communication hole 41 and conveying the reaction gas to a second connecting pipe, and the second connecting pipe is used for conveying the reaction gas to the ground.

During specific implementation, the first connecting pipe is arranged in the roadway 3 and can be connected with the inner wall of the roadway 3, so that the first connecting pipe is stably fixed. The second connection pipe may be connected with an inner wall of the shaft 1 within the shaft 1 to achieve stable fixation of the second connection pipe.

In specific implementation, the first end of the first connecting pipe may be detachably connected to the communicating hole 41, for example, by a flange, and certainly, the detachable connection may also be implemented by other manners, which is not limited in this embodiment. The second end of the first connecting pipe and the first end of the second connecting pipe can be detachably connected, for example, flange connection, and certainly, detachable connection can also be realized by other ways, and this embodiment does not limit this.

In a specific implementation, when there are at least two communication holes 41, the number of the first connection pipes and the number of the second connection pipes are the same as the number of the communication holes 41, one communication hole 41 corresponds to one first connection pipe, and one first connection pipe corresponds to one second connection pipe.

It can be seen that, in this embodiment, through setting up first connecting pipe and second connecting pipe, like this, the reaction gas in horizontal directional hole 2 can loop through first connecting pipe and second connecting pipe and carry to ground, and first connecting pipe is as the gas collection passageway, and the second connecting pipe is as the gas transmission passageway, and the staff of being convenient for gets into underground gasifier and then expands gasification working face, expands underground gasifier's structure, has increased gasification range effectively, has improved gasification output to, simple structure, easy to carry out.

Referring to fig. 1 to 4, in each of the above embodiments, there are at least two horizontal directional holes 2, a first end of each horizontal directional hole 2 is connected to the ground, a second end of each horizontal directional hole 2 is communicated with a roadway 3, and each horizontal directional hole 2 is used for conveying the generated reaction gas into the roadway 3. The two adjacent horizontal directional holes 2 have a preset distance therebetween, and the preset distance may be the same or different, and is determined according to actual conditions, which is not limited in this embodiment. Preferably, any two adjacent horizontally oriented holes 2 have the same preset distance therebetween. More preferably, the horizontally oriented holes 2 are evenly arranged along the length of the roadway 3.

Preferably, the number of the horizontal directional holes 2 is even, each horizontal directional hole 2 is respectively arranged at two sides of the roadway 3, and each horizontal directional hole 2 arranged at two sides of the roadway 3 is symmetrically arranged relative to the roadway 3. Specifically, the horizontal directional holes 2 are two parts, one part is arranged on one side of the roadway 3, the other part is arranged on the other side of the roadway 3, the two parts of the horizontal directional holes 2 are arranged in a one-to-one correspondence manner, and the two parts of the horizontal directional holes 2 are symmetrically arranged relative to the roadway 3. More preferably, the horizontally oriented holes 2 on both sides of the roadway 3 are uniformly arranged along the length direction of the roadway 3. Therefore, the horizontal directional holes 2 can be uniformly distributed, so that the underground gasification furnace is neat and safe in structure and convenient to construct.

During specific implementation, the side wall of the roadway 3 corresponding to each horizontal directional hole 2 is provided with openings, the number of the openings and the number of the support walls 4 are equal to the number of the horizontal directional holes 2, and the openings and the support walls are arranged in a one-to-one correspondence manner, each opening is provided with one support wall 4, communication holes 41 are formed in each support wall 4 corresponding to the horizontal directional holes 2, and each communication hole 41 is used for enabling the corresponding horizontal directional hole 2 to be communicated with the roadway 3.

In specific implementation, the number of the first connecting pipes and the second connecting pipes is multiple, and each communicating hole 41 on the supporting wall 4 at the communicating part of each horizontal directional hole 2 and the roadway 3 is communicated with the second connecting pipe through the first connecting pipe. When there are at least two horizontally oriented bores 2, the second ends of the first connecting pipes meet at the bottom of the shaft 1 and are connected with the corresponding second connecting pipes.

It can be seen that, in the embodiment, the number of the horizontal directional holes 2 is at least two, so that the gasification working surface is effectively enlarged, the coal gasification reaction is better carried out, and the working efficiency of the underground gasification furnace is improved.

Referring to fig. 3 and 4, in each of the above embodiments, the top of the roadway 3 is provided with a supporting layer 5, and the supporting layer 5 is used for supporting and reinforcing the top of the roadway 3 to prevent the roof of the roadway 3 from falling.

In specific implementation, the supporting layer 5 may have any structure as long as it can support and reinforce the top of the roadway 3, and this embodiment is not limited to this. In the present embodiment, only one of the structures of the supporting layer 5 is described, but not limited to this structure: and performing anchor-shotcreting support on the top of the roadway 3, namely firstly setting an anchor rod and then spraying concrete. In this embodiment, the length of the anchor rod is 4-5m, and the thickness of the sprayed concrete is 150-200 mm.

It can be seen that, in this embodiment, the supporting layer 5 is arranged at the top of the roadway 3, so that the roof of the roadway 3 can be effectively prevented from falling, the collapse of the roadway 3 is avoided, the roadway 3 is ensured to work safely and stably, and the normal operation of the coal gasification reaction is ensured.

Referring to fig. 2 and 3, in the above embodiments, the side wall of the tunnel 3 is provided with the reinforcing device 6, and the reinforcing device 6 is used for reinforcing the tunnel 3 to avoid the collapse of the tunnel 3. In specific implementation, the reinforcing device 6 is arranged on the side wall of the roadway 3 without an opening. In the present embodiment, the tunnel 3 has a rectangular parallelepiped shape, and the reinforcing devices 6 are provided on both side walls of the tunnel 3.

In specific implementation, the reinforcing device 6 may have any structure as long as it can reinforce the roadway 3, and this embodiment does not limit this. In the present embodiment, only one of the structures of the reinforcing device 6 is described, but not limited to this structure: the side walls of the two sides of the roadway 3 are provided with the sealing walls, namely, the side walls of any one side of the roadway 3 are supported by steel supports, and the sealing walls are formed by utilizing brickworks, hanging nets and spraying high-temperature-resistant concrete. In the embodiment, the thickness of the sealing wall on any side wall of the roadway 3 is 1-1.5m, and the sealing wall can resist the high temperature of more than 1000 ℃.

It can be seen that, in this embodiment, set up reinforcing apparatus 6 through the lateral wall in tunnel 3, can consolidate tunnel 3, avoid collapsing in tunnel 3, ensure tunnel 3 safety, stably carry reaction gas to shaft 1 in, improved the stability and the security of underground gasification stove.

Referring to fig. 2 to 4, in each of the above embodiments, the inner wall of the shaft 1 is provided with a supporting device 7, and the supporting device 7 is used for supporting and reinforcing the shaft 1.

In specific implementation, the supporting device 7 may have any structure as long as it can support and reinforce the shaft 1, and this embodiment is not limited to this. In the present embodiment, only one of the structures of the supporting device 7 is described, but not limited to this structure: the rock mass of the rock mass above the coal seam is from 'good' to 'normal', and the inner wall of the vertical shaft 1 is provided with a single layer of reinforced concrete, wherein the thickness of the single layer of reinforced concrete is 500mm in the embodiment. When the quality of the rock mass of the rock layer above the coal seam is poor, the inner wall of the vertical shaft 1 is provided with the spray anchor net and the single-layer reinforced concrete, in the embodiment, the spray anchor net is 100mm, and the thickness of the single-layer reinforced concrete is 400 mm. When the quality of the rock mass of the rock layer above the coal seam is poor, the inner wall of the vertical shaft 1 is provided with the spray anchor net and the double-layer reinforced concrete, in the embodiment, the spray anchor net is 100mm, and the thickness of the double-layer reinforced concrete is 400 mm.

It can be seen that, in this embodiment, the supporting device 7 is arranged on the inner wall of the shaft 1, and the supporting device 7 reinforces and supports the shaft 1, so that the collapse of the shaft 1 can be effectively prevented, the shaft 1 is ensured to convey the reaction gas to the ground safely and stably, and the normal operation of the coal gasification reaction is ensured.

In conclusion, the horizontal directional hole 2 is used as a gas production channel, the gasification process is stable, the control is easy, the construction is convenient, the construction time is short, the vertical shaft 1 is used as a gas transmission channel, the reaction gas can be better and more conveyed, a large number of gas outlet holes are not needed to be arranged, the gas transmission is centralized and stable, the second end of the vertical shaft 1 is firmer and more stable, the phenomenon that the existing shaft-free gasification furnace is easy to collapse and cause blockage is avoided, the second end of the horizontal directional hole 2 is communicated with the second end of the vertical shaft 1, the structure is simple, the furnace construction period is short, the cost is saved, the underground gasification furnace is safer and more stable, and the efficient, stable, continuous and clean exploitation of underground coal resources is realized; in addition, a large amount of land is not required to be occupied, the environment is protected, and the damage of ecological balance is avoided.

It will be apparent to those skilled in the art that various changes and modifications may be made 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 and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An underground gasifier, comprising: a vertical shaft (1), a horizontal directional hole (2) and a roadway (3); wherein,

the first end of the vertical shaft (1) is connected with the ground, and the second end of the vertical shaft (1) is arranged in the coal seam;

the first end of the horizontal directional hole (2) is connected with the ground, the second end of the horizontal directional hole (2) is placed in the coal seam and communicated with the second end of the vertical shaft (1), and the horizontal directional hole (2) is used for carrying out coal gasification reaction to generate reaction gas;

the vertical shaft (1) is used for conveying the reaction gas;

the roadway (3) is arranged in the coal seam and communicated with the second end of the vertical shaft (1);

the second end of the horizontal directional hole (2) is communicated with the roadway (3), and the roadway (3) is used for receiving the reaction gas generated in the horizontal directional hole (2) and conveying the reaction gas to the vertical shaft (1).

2. The underground gasification furnace according to claim 1, further comprising: a supporting wall (4); wherein,

the tunnel (3) is provided with an opening corresponding to the side wall of the horizontal directional hole (2), the supporting wall (4) is arranged at the opening, the supporting wall (4) is provided with a communication hole (41), the communication hole (41) is used for communicating the horizontal directional hole (2) with the tunnel (3), and the reaction gas generated in the horizontal directional hole (2) is conveyed into the tunnel (3).

3. The underground gasification furnace according to claim 2, further comprising: a first connecting pipe arranged in the roadway (3) and a second connecting pipe arranged in the vertical shaft (1); wherein,

a first end of the first connection pipe is connected with the communication hole (41), and a second end of the first connection pipe is connected with the second connection pipe;

the first connecting pipe is used for conveying the reaction gas conveyed by the communicating hole (41) to the second connecting pipe; the second connecting pipe is used for conveying the reaction gas to the ground.

4. An underground gasification furnace according to any one of claims 1 to 3, wherein the number of the horizontally oriented holes (2) is at least two, a first end of each horizontally oriented hole (2) is connected with the ground, and a second end of each horizontally oriented hole (2) is communicated with the roadway (3).

5. An underground gasification furnace according to claim 4, characterized in that the number of the horizontal directional holes (2) is an even number, and each horizontal directional hole (2) is respectively disposed at both sides of the tunnel (3) and symmetrically disposed with respect to the tunnel (3).

6. An underground gasifier according to any one of claims 1 to 3, characterized in that the top of the roadway (3) is provided with a supporting layer (5).

7. An underground gasifier according to any one of claims 1 to 3, characterized in that the side walls of the galleries (3) are provided with reinforcing means (6).

8. The underground gasification furnace according to any one of claims 1 to 3,

the roadway (3) is arranged along the main crack direction of the coal seam;

and the second end of the horizontal directional hole (2) is vertical to the roadway (3).

9. An underground gasifier according to claim 1, characterized in that the inner wall of the shaft (1) is provided with a support device (7).