CN204877423U - Gasification agent conveyer pipe and underground fuel gasification system thereof - Google Patents

Abstract

The utility model discloses a gasification agent delivery pipe and an underground fuel gasification system thereof. The gasifying agent conveying pipe includes a water conveying pipe and an air conveying pipe, the water conveying pipe and the air conveying pipe are combined, the lumen of the water conveying pipe and the lumen of the gas conveying pipe are isolated from each other, when the gasifying agent When the conveying pipe changes from a straight state to a curved state or from a curved state to a straight state, the lumen of the water conveying pipe and the lumen of the air conveying pipe are respectively in a conduction state. The underground fuel gasification system includes an underground gasification furnace, the aforementioned gasification agent delivery pipe and atomization mixing nozzle. The utility model can mix water and combustion-supporting gas in the underground fuel gasification reaction zone without heat to form a mist gasification agent, realize normal and stable underground gasification process, and greatly reduce production cost.

Description

A gasification agent delivery pipe and its underground fuel gasification system

technical field

The utility model relates to a delivery pipe and a fuel gasification system thereof, in particular to a gasification agent delivery pipe and an underground fuel gasification system thereof.

Background technique

According to the statistics of the China Coalfield Geology Administration (1999), the coal resources with a buried depth of less than 2000m in my country total 4552.104 billion tons. Among them: 1,844.048 billion tons of coal resources buried below 1,000m, of which 916.910 billion tons are reliable, accounting for 40.5% of the predicted total; 1,340.375 billion tons are buried at 1,000-1,500m, of which 667.691 billion tons are reliable, accounting for 40.5% of the predicted total. 29.4% of the total; buried depth of 1500-2000m is 1,367.681 billion tons, of which 329.229 billion tons are reliable, accounting for 30.1%. Deep resources (below 1000m) account for 59.5% of my country's coal resource reserves, most of which are distributed in Xinjiang and Inner Mongolia Autonomous Region. As deep coal resources are affected by factors such as ground temperature and rock burst, it is difficult to guarantee mining technology, safety and economy. Utilizing underground coal gasification technology can realize the development of deep coal resources, which will create a new way for the exploitation and utilization of deep coal resources.

Underground coal gasification is an energy conversion technology that efficiently and cleanly utilizes low-quality coal resources. It is to directly burn underground coal in a controlled manner, and generate combustible gas through thermal and chemical effects on coal (oil or oil rock formations). gas process.

The underground coal gasification fuel layer cannot move, but relies on the movement of the gasification working face to keep the gasification process continuous. At the same time, to convert solid coal with high carbon content into gaseous energy with high hydrogen content, usually adding Water vapor, but the coal seam is 100 meters or even kilometers below the ground, and the surface water vapor condenses into water after reaching the ground, which is difficult to participate in the gasification reaction; the gas at the outlet of the underground gasifier contains a large amount of water vapor, which becomes Contaminated wastewater, and a large amount of polluted wastewater will also be generated during extraction and treatment in the underground gasification burn-out zone.

Existing technology: American CRIP (Controlled Retraction Injection Point) process, see Figure 1. In this process, the production well is a vertical well, and the injection well is a directional well connected to the production well. Once the channel between the wells is established, the single-channel gasification agent delivery pipe directly sends the gasification agent in the form of high-temperature steam to the gasification agent. The gasification working face is injected into the horizontal section of the coal seam at the end of the well to start the gasification reaction. When the coal near the reaction chamber is used up (confirmed by the gas composition measuring instrument), the injection point is retracted, and the new gas The chemical reaction zone is formed again (re-lighting is required at this time). Through this method, it is possible to control the gas injection point to move backward as the gasification working face retreats.

In the prior art, since water must be heated into high-temperature steam (temperature higher than 100 degrees Celsius), then high-temperature steam and oxygen are mixed to form a high-temperature steam-like gasification agent, and then the high-temperature steam-like gasification agent is converted from The ground is transported to the underground for gasification reaction to produce syngas. Therefore, it needs to consume a lot of heat energy, and at the same time, it consumes a lot of external pressure to press the high-temperature steam-like gasification agent into the ground, which greatly increases the production cost. Since the underground coal seam gasification reaction zone of the coal seam gasifier is 300 meters deep from the surface, any gasification agent must be transported through pipelines buried deep in the ground. And the pipeline also needs to pass through some aquifers during the journey extending into the coal seam, so the temperature difference between the pipe wall of the pipeline and the high-temperature steam-like gasifying agent is extremely large. Based on the above reasons, when the high-temperature steam gasification agent flows through the pipeline to the underground coal seam gasification reaction zone, it will inevitably lose a large amount of heat, and the heat will diffuse to the formation through the pipe wall and be wasted in vain. Therefore, when the high-temperature steam-like gasification agent reaches the coal seam gasification reaction zone through the gasification furnace inlet, part of the high-temperature steam-like gasification agent turns into water and is separated from the water after heat dissipation. Oxygen, loses the function of high-temperature steam-like gasification agent, when this part of liquid water is reheated through coal seam combustion in the coalbed gasification reaction zone, and then combines with oxygen to form a gasification agent to participate in the gasification reaction, the coalbed gasification reaction zone A large amount of energy will be consumed, which will lead to a reduction in the temperature of the gasification working surface and a reduction in the gasification reaction rate.

In the CRIP process in the prior art, since the time to set up a new coalbed gasification reaction zone at the retreating gas injection point is determined after the coal seam in the coalbed gasification reaction zone is burnt out (only according to the gas composition measured by the gas composition measuring instrument and content), each time the gas injection point is moved back to establish a new coalbed gasification reaction zone, the coal seam in the new coalbed gasification reaction zone must be re-ignited, and the ignition process takes a long time for gas production, which greatly reduces the efficiency of gas production. Retreating the inlet pipeline of the coalbed gasification reaction zone is not a continuous and stable process, but a long distance (more than 20 meters), and the control process and indicators are not clear.

In the prior art, a large amount of sewage from coal gas condensation is directly passed into the gasifier without any treatment, which will have a certain negative impact on the gasifier and affect the normal combustion and gasification of the gasifier. In severe cases, it will Cause the gasifier to go out.

Utility model content

The first technical problem to be solved by the utility model is to provide an underground fuel gasification method, which can transport water to the underground fuel gasification reaction zone without consuming external pressure energy, and only consumes a small amount of external pressure energy. The supporting gas is transported to the underground fuel gasification reaction zone, and water and the supporting gas can be mixed in the underground fuel gasification reaction zone without heat to form a mist gasification agent, so as to realize the normal and stable underground gasification process and greatly reduce the Cost of production.

The second technical problem to be solved by the utility model is to provide a gasification agent delivery pipe, which can transport water to the underground fuel gasification reaction zone without consuming external pressure energy, and only consumes a small amount of external pressure energy. The pressure energy can transport the supporting gas to the underground fuel gasification reaction zone, and the water and the supporting gas can be mixed in the underground fuel gasification reaction zone to form a mist gasification agent without heat, so as to realize the normal and stable underground gasification process. Stable, greatly reducing production costs.

The third technical problem to be solved by the utility model is to provide an underground fuel gasification system, which can transport water to the underground fuel gasification reaction zone without consuming external pressure energy, and only consumes a small amount of external pressure energy. The supporting gas is transported to the underground fuel gasification reaction zone, and water and the supporting gas can be mixed in the underground fuel gasification reaction zone without heat to form a mist gasification agent, so as to realize the normal and stable underground gasification process and greatly reduce the Cost of production.

As far as the method is concerned, in order to solve the above-mentioned technical problems, the underground fuel gasification method of the present invention is to continuously transport water and supporting gas to the underground fuel gasification reaction zone respectively, and utilize the pressure potential energy between the water from the ground to the ground The water transported to the underground fuel gasification reaction zone is atomized, and the water vapor generated after atomization is mixed with the supporting gas transported to the underground fuel gasification reaction zone to form a mist gasification agent. In the underground fuel gasification reaction zone, the underground fuel undergoes gasification reaction through combustion and heating to generate gas, and the generated gas is discharged.

The water sent to the underground fuel gasification reaction zone is clean water or sewage or water mixed with clean water and sewage. The sewage is condensed water after the gas is discharged, surface sewage generated during construction, sewage generated by gas purification and fuel air treatment, non-potable groundwater and/or natural precipitation, and the natural precipitation is rainwater and snow water , the sewage is purified to obtain purified water, and the purified water is transported to the underground fuel gasification reaction zone. The purification treatment is carried out by sedimentation and/or filtration of sewage.

Taking the discharged gas components and the temperature of the gasification reaction zone as indicators, adjust the gas-water ratio and the time and speed of the gas injection point retreat in the gasification reaction zone to realize continuous retreat and cyclic gasification, thereby realizing the continuous and stable underground gasification process .

Compared with the prior art, the underground fuel gasification method of the utility model has the following beneficial effects.

1. In this technical solution, the water and the supporting gas are continuously transported to the underground fuel gasification reaction zone respectively, and the water transported to the underground fuel gasification reaction zone is misted by using the pressure potential energy between the water from the ground to the ground. The mist gasification agent is formed by mixing the water vapor generated after atomization with the combustion-supporting gas transported to the underground fuel gasification reaction zone, and the mist gasification agent is heated with the underground fuel in the underground fuel gasification reaction zone Gasification reaction generates gas and discharges the generated gas, so the water can be transported to the underground fuel gasification reaction area without consuming external pressure energy, and the supporting gas can be transported to the underground fuel with only a small amount of external pressure energy In the gasification reaction zone, water and combustion-supporting gas can be mixed in the underground fuel gasification reaction zone without heat to form a mist gasification agent, which realizes the normal and stable underground gasification process and greatly reduces production costs.

2. This technical solution adopts the technical means that the water transported to the underground fuel gasification reaction zone is clean water or sewage or mixed water from clean water and sewage, so it not only turns waste into wealth, but also saves a lot of water resources, moreover, help protect the environment. In addition, because the sewage is purified and treated to obtain purified water, and the purified water is transported to the underground fuel gasification reaction zone, the negative impact on the gasification furnace can be greatly reduced without affecting the gasification process. Normal combustion and gasification of the furnace to avoid extinguishing the gasification furnace. Also, because the technical means that the purification treatment is carried out by sewage sedimentation and/or filtration are adopted, the cost of sewage purification treatment can be greatly reduced.

3. Since this technical solution adopts the technical means of adjusting the gas-water ratio and the time and speed of the gas injection point in the gasification reaction zone taking the discharged gas components and the temperature of the gasification reaction zone as indicators, it can not only The gas composition determines whether the fuel in the underground fuel gasification reaction zone is burnt out, and it can also be judged according to the temperature of the gasification reaction zone whether the fuel in the underground fuel gasification reaction zone is still burning. When the fuel in the gasification reaction zone is about to burn out and is still in the burning state, the gas injection point can be continuously retreated and gasified without repeating the ignition process, thereby realizing the continuous and stable underground gasification process and improving the underground fuel gas. Under the premise of improving the fuel utilization rate in the chemical reaction zone, the production efficiency of gas is improved.

As far as the delivery pipe is concerned, in order to solve the above-mentioned second technical problem, the gasification agent delivery pipe of the present invention includes a water delivery pipe and a gas delivery pipe, the water delivery pipe and the gas delivery pipe are combined together, and the water delivery pipe The lumen and the lumen of the air delivery tube are isolated from each other. When the gasification agent delivery tube changes from a straight state to a curved state or from a curved state to a straight state, the lumen of the water delivery tube and the lumen of the gas delivery tube respectively in the conduction state.

The gas delivery pipe is located in the water delivery pipe or the water delivery pipe is located in the gas delivery pipe; or, the gas delivery pipe is connected in parallel with the water delivery pipe; or, the gasifying agent delivery pipe is provided with There is a continuous axial partition, and the axial partition divides the inner chamber of the gasification agent delivery pipe into two sub-chambers, wherein one of the sub-chambers constitutes the inner chamber of the water delivery pipe, and the other The sub-lumen constitutes the lumen of the gas delivery tube.

The inner cavity of the water delivery pipe is provided with supporting frames at intervals; and/or, the inner cavity of the air delivery pipe is provided with supporting frames at intervals.

The outlet end of the gasification agent delivery pipe is provided with an atomizing mixing nozzle; It is a cylindrical shell with a hemispherical front end. There are multiple nozzles distributed at the front end of the gas mixing head, and there are thermocouple holes at the front end of the gas mixing head; the rear end of the gas mixing head is connected to the front end of a connecting pipe. The center of the connecting pipe is provided with a combustion-supporting agent injection hole, and the rear end of the combustion-supporting agent injection hole extends backwards to form a combustion-supporting agent connection pipe. A plurality of axial mist nozzles are arranged around the combustion-supporting agent injection hole on the connecting pipe. A thermocouple through-hole is arranged in the axial direction on the connecting pipe, and an outer spray cone is arranged on the outer diameter of the connecting pipe, and the diameter of the front end of the outer spray cone is larger than the diameter of the rear end; The rear end of the connection pipe is connected to the front end of a water injection connection pipe, the inner cavity of the water injection connection pipe communicates with the axial atomization nozzle hole and the thermocouple through hole of the intermediate connection pipe, and the front end of the water injection connection pipe is provided with a The front cone surface corresponding to the outer spray cone surface of the water injection nozzle is provided with a spray gap between the front cone surface of the water injection nozzle and the outer spray cone surface of the intermediate connecting pipe to form a slit nozzle. The slit nozzle and the radial atomization nozzle hole in the inner cavity of the water injection connection; the combustion aid connection passes through the inner cavity of the water injection connection; the anti-tempering atomization mixing nozzle is also provided with a port tee, and the port tee is provided with A communication port, a water inlet, and a gas-supporting interface, the communication port communicates with the water injection pipe, the gas-supporting interface passes through the air inlet of the gas-supporting pipe, and the air inlet communicates with the gas delivery pipe The air outlet, the water inlet is connected to the water outlet of the water delivery pipe; a thermocouple is installed in the thermocouple hole of the gas mixing head, and the wire of the thermocouple passes through the thermocouple of the connecting pipe. The hole and the inner cavity of the water injection pipe are drawn from the gas-supporting interface of the port tee.

Compared with the prior art, the gasification agent delivery pipe of the utility model has the following beneficial effects.

1. Due to the adoption of the gasification agent delivery pipe in this technical solution, the water delivery pipe and the gas delivery pipe are combined, and the lumen of the water delivery pipe and the lumen of the gas delivery pipe are isolated from each other. When the gasification agent delivery pipe changes from a straight state to a curved state or from a curved state to a straight state, the lumen of the water delivery pipe and the lumen of the gas delivery pipe are respectively in a conductive state, so, The water can be transported to the underground fuel gasification reaction zone without consuming external pressure energy, and at the same time, the supporting gas can be transported to the underground fuel gasification reaction zone only by consuming a small amount of external pressure energy, so that the gas can be transported underground without heat. In the fuel gasification reaction zone, water and combustion-supporting gas are mixed to form mist gasification agent to provide necessary conditions, thereby realizing the normal and stable underground gasification process and greatly reducing production costs.

2. In this technical solution, the gas conveying pipe is located in the water conveying pipe or the water conveying pipe is located in the air conveying pipe; or, the gas conveying pipe is connected in parallel with the water conveying pipe; or, The gasification agent delivery pipe is provided with a continuous axial partition, and the axial partition divides the inner chamber of the gasification agent delivery pipe into two sub-chambers, wherein one sub-chamber constitutes the inner cavity of the gasification agent delivery pipe. The inner cavity of the water delivery pipe and the other sub-inner cavity constitute the inner cavity of the gas delivery pipe. Therefore, a variety of gasification agent delivery pipes can be produced according to the different needs of customers.

3. This technical solution adopts the technical means that the inner cavity of the water delivery pipe is provided with supporting frames at intervals; and/or, the inner cavity of the gas delivery pipe is provided with technical means of supporting frames at intervals, so it can effectively It prevents the inner cavity of the water delivery pipe and the inner cavity of the gas delivery pipe from being closed to block the passage of water and combustion-supporting gas when they are in a bent state, and at the same time, does not hinder the winding of the gasification agent delivery pipe.

4. This technical solution adopts the technical means that the outlet end of the gasification agent delivery pipe is equipped with an atomization mixing nozzle, so the pressure potential energy between the water from the ground to the ground can be used to transport the gasification agent to the underground fuel gasification reaction zone. The water is atomized through the atomizing mixing nozzle, and the water vapor generated after atomization is mixed with the supporting gas transported to the underground fuel gasification reaction zone to form a atomized gasification agent. And because the atomization mixing nozzle is adopted as the technical means of anti-tempering atomization mixing nozzle, during the gasification reaction process, the generated gas can be prevented from flowing to the side of the gasification furnace inlet hole for combustion and causing flashback. Also due to the adoption of the anti-tempering atomization mixing spray head, a gas mixing head is provided, and the gas mixing head is a cylindrical shell with a hemispherical front end, and a plurality of nozzles are distributed at the front end of the gas mixing head. The front end is also provided with a thermocouple hole; the rear end of the gas mixing head is connected to the front end of a connecting pipe, and the center of the connecting pipe is provided with a combustion aid injection hole, and the rear end of the combustion aid injection hole extends backward A combustion aid connecting pipe is formed, and a plurality of axial atomization nozzles are arranged around the combustion aid injection hole on the central connecting pipe, and a thermocouple through hole is also arranged on the central connecting pipe along the axial direction. The diameter of the outer spray cone is set on the diameter of the outer spray cone, and the diameter of the front end of the outer spray cone is larger than the diameter of the rear end; The axial atomization nozzle hole and the thermocouple through hole are connected, and the front end of the water injection connecting pipe is provided with a front cone surface corresponding to the outer spray cone surface of the intermediate connecting pipe. A spray gap is provided between the outer spray cones of the water injection nozzle to form a slit nozzle, and a radial atomization nozzle hole connecting the slit nozzle and the inner cavity of the water injection nozzle is provided on the water injection nozzle; the combustion aid nozzle passes through the water injection nozzle. Inner cavity; the anti-tempering atomization mixing nozzle is also provided with a port tee, the port tee is provided with a communication port, a water inlet, and a gas-supporting interface, the communication port is connected with the water injection connection, and the gas-supporting interface passes through There is an air inlet of the gas-supporting pipe, the air inlet is connected to the gas outlet of the gas delivery pipe, and the water inlet is connected to the water outlet of the water delivery pipe; The couple hole is equipped with a thermocouple, the wire of the thermocouple passes through the thermocouple through hole of the intermediate connecting pipe, and the inner cavity of the water injection connection pipe is drawn from the gas-supporting interface of the port tee. Therefore, it can not only prevent backflow In addition, the temperature of the underground fuel gasification reaction zone can be detected in real time. When the fuel in the underground fuel gasification reaction zone is about to burn out and is still in the burning state, the injection process can be realized without repeating the ignition process. The continuous receding and continuous gasification of the gas point can realize the continuous and stable underground gasification process, and improve the production efficiency of gas under the premise of improving the fuel utilization rate in the underground fuel gasification reaction zone.

As far as the system is concerned, in order to solve the above-mentioned third technical problem, the underground fuel gasification system of the present invention includes an underground gasification furnace. The underground gasification furnace has a furnace chamber located in the coal seam, communicates with the furnace chamber and The air inlet leading to the ground, the air outlet connected to the furnace chamber and leading to the ground, and the gasification agent delivery pipe extending from the air inlet to the furnace chamber in a forward and backward manner, and the gasification agent delivery pipe is In the gasification agent delivery pipe mentioned above, the atomization mixing nozzle is located in the furnace cavity, the water inlet of the water delivery pipe in the gasification agent delivery pipe is connected to the water source, and the gasification agent delivery pipe in the gasification agent delivery pipe The air inlet of the conveying pipe communicates with the gas-supporting source, and the air outlet communicates with the air inlet of the water-gas separator.

The sewage outlet of the water-gas separator is connected to the sewage inlet of the sewage sedimentation tank, the purified water outlet of the sewage sedimentation tank is connected to the water inlet of the frequency conversion sewage pump, and the water outlet of the frequency conversion sewage pump is connected to the water delivery pipe water inlet.

The gas outlet of the water-gas separator is connected with the gas inlet of the gas component measuring instrument, the rear part of the gasification agent delivery pipe is wound by the delivery pipe reel device, and the front part of the gasification agent delivery pipe The hydraulic interface of the delivery pipe reel device is connected with the hydraulic interface of the first hydraulic cylinder in the hydraulic station through the oil circuit, and the hydraulic interface of the delivery pipe drive device is connected with the hydraulic The hydraulic interface of the second hydraulic cylinder in the station is connected through the oil circuit, the hydraulic interface of the blowout preventer is connected with the hydraulic interface of the second hydraulic cylinder in the hydraulic station through the oil circuit, and the three hydraulic cylinders are respectively connected through three control valves. control, the control signal input terminals of the three control valves are respectively electrically connected to the three control signal output terminals of the controller, the signal output terminals of the gas component measuring instrument are electrically connected to the signal input terminals of the controller, The signal output end of the thermocouple is electrically connected with the signal input end of the controller.

Compared with the prior art, the underground fuel gasification system of the utility model has the following beneficial effects.

1. In this technical solution, the gasification agent delivery pipe is the aforementioned gasification agent delivery pipe, the atomization mixing nozzle is located in the furnace cavity, and the water delivery pipe in the gasification agent delivery pipe The water inlet of the gasification agent delivery pipe is connected with the water source, and the air inlet of the gas delivery pipe in the gasification agent delivery pipe is connected with the gasification source, so the water can be delivered to the underground fuel gasification reaction zone without consuming external pressure energy , Only a small amount of external pressure energy can be used to transport the supporting gas to the underground fuel gasification reaction zone, and water and the supporting gas can be mixed in the underground fuel gasification reaction zone to form a mist gasification agent without heat, realizing underground The normal and stable gasification process greatly reduces production costs.

2. In this technical solution, the sewage outlet of the water-gas separator is connected to the sewage inlet of the sewage sedimentation tank, and the purified water outlet of the sewage sedimentation tank is connected to the water inlet of the frequency conversion sewage pump. The technical means that the water outlet is connected to the water inlet of the water delivery pipe, so not only can waste be turned into wealth, save a lot of water resources, but also help protect the environment, and at the same time, can greatly reduce the negative impact on the gasifier It does not affect the normal combustion and gasification of the gasifier, and avoids the extinguishment of the gasifier, which can greatly reduce the cost of purifying sewage.

3. In this technical solution, since the air outlet of the water-gas separator is connected to the air inlet of the gas component measuring instrument, the rear part of the gasification agent delivery pipe is wound by the delivery pipe reel device, and the The front part of the gasification agent delivery pipe is sent underground through the delivery pipe driving device and the blowout preventer, and the hydraulic interface of the delivery pipe reel device communicates with the hydraulic interface of the first hydraulic cylinder in the hydraulic station through the oil circuit. The hydraulic interface of the pipe driving device communicates with the hydraulic interface of the second hydraulic cylinder in the hydraulic station through the oil circuit, and the hydraulic interface of the blowout preventer communicates with the hydraulic interface of the second hydraulic cylinder in the hydraulic station through the oil circuit. The hydraulic cylinder is respectively controlled by three control valves, the control signal input ends of the three control valves are respectively electrically connected to the three control signal output ends of the controller, and the signal output ends of the gas component measuring instrument are connected to the control The signal input end of the thermocouple is electrically connected, and the signal output end of the thermocouple is electrically connected to the signal input end of the controller. Therefore, not only can the gas composition in the underground fuel gasification reaction zone be determined according to the Whether the fuel is burnt out, and it can also be judged according to the temperature of the gasification reaction zone whether the fuel in the underground fuel gasification reaction zone is still burning. In the combustion state, without repeating the ignition process, the gas injection point can be continuously retreated and gasified, so as to realize the continuous and stable underground gasification process, and improve the fuel utilization rate in the underground fuel gasification reaction zone. Gas production efficiency.

Description of drawings

The lower fuel gasification method, the gasification agent delivery pipe and the system thereof of the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of the structure of the CRIP process in the US in the prior art.

Fig. 2 is a schematic flow chart of the underground fuel gasification method of the present invention.

Fig. 3 is a schematic diagram of the cross-sectional structure of the first gasification agent delivery pipe of the present invention.

FIG. 4 is a schematic cross-sectional structural diagram of line A-A in FIG. 3 .

Fig. 5 is a schematic diagram of the cross-sectional structure of the second gasification agent delivery pipe of the present invention.

Fig. 6 is a schematic diagram of the cross-sectional structure of the third gasifying agent delivery pipe of the present invention.

Fig. 7 is a structural schematic diagram of the anti-temper atomization mixing nozzle of the present invention.

Fig. 8 is a structural schematic diagram of the underground fuel gasification system of the present invention.

Fig. 9 is a schematic diagram of the principle of water and combustion-supporting gas forming the gasification agent of the present invention in the gasification zone.

Fig. 10 is a schematic diagram of the connection structure of the control system in the present invention.

The markings in the figure are explained as follows.

1~coal seam;

2~Underground gasifier;

2-1~ Furnace cavity;

2-2~ air intake hole;

2-3~ air outlet;

2-4~Underground gasification reaction zone;

2-5~ air collecting cavity;

3~ water and gas separation delivery pipe;

3-1~ water delivery pipe;

3-2~ air delivery pipe;

3-3~ supporting frame;

3-4~ Axial partition;

4~ Anti-temper atomization mixing nozzle;

4-1~ gas mixing head;

4-2~ shower nozzle;

4-3~ thermocouple;

4-4~ connecting pipe;

4-5~ combustion aid injection hole;

4-6~ Axial atomization nozzle holes;

4-7~ Water injection connection;

4-8~radial atomization nozzle holes;

4-9~ slit nozzle;

4-10~ water inlet;

4-11~ air inlet;

4-12~ The combustion aid takes over;

4-13~ port tee;

5~ Conveyor pipe driving device;

5-1~ BOP;

6~ guide groove;

7~ Conveyor pipe reel device;

8~ Water and gas separation supply device;

9~ water inlet;

10~ air inlet;

11~hydraulic station;

11-1~hydraulic cylinder;

11-2~ control valve;

12~ water and gas separator;

13~ sewage sedimentation tank;

13-1~ filter device;

14~ variable frequency sewage pump;

15~ gas component measuring instrument;

16~ flow meter;

17 ~ pressure gauge;

18 ~ controller.

Detailed ways

As shown in Figures 8 to 9, this embodiment provides an underground fuel gasification method, which continuously transports water and supporting gas to the underground fuel gasification reaction zone respectively, and utilizes the pressure potential energy between the water from the ground to the ground The water transported to the underground fuel gasification reaction zone is atomized, and the water vapor generated after atomization is mixed with the supporting gas transported to the underground fuel gasification reaction zone to form a mist gasification agent. In the underground fuel gasification reaction zone, the underground fuel undergoes gasification reaction through combustion and heating to generate gas, and the generated gas is discharged.

As a preference, the temperature of the water is between 50°C and 100°C before being transported to the underground fuel gasification reaction zone. This can improve the gasification efficiency.

As a further preference, the water is heated by solar energy before being transported to the underground fuel gasification reaction zone. In this way, not only is it clean and environmentally friendly, but also the energy cost is low.

In this embodiment, the water and the supporting gas are continuously transported to the underground fuel gasification reaction zone, and the water transported to the underground fuel gasification reaction zone is atomized by using the pressure potential energy between the water from the ground to the ground. The water vapor generated after atomization is mixed with the combustion-supporting gas transported to the underground fuel gasification reaction zone to form a mist gasification agent, and the mist gasification agent is gasified with the underground fuel in the underground fuel gasification reaction zone through combustion and heating It is a technical means to generate gas by reaction and discharge the generated gas, so the water can be transported to the underground fuel gasification reaction area without consuming external pressure energy, and the auxiliary gas can be transported to the underground fuel gasification reaction area only by consuming a small amount of external pressure energy In the reaction zone, water and combustion-supporting gas can be mixed in the underground fuel gasification reaction zone without heat to form a mist gasification agent, which realizes the normal and stable underground gasification process and greatly reduces production costs.

As an improvement of this embodiment, as shown in Fig. 8, the water transported to the underground fuel gasification reaction zone can be clean water or sewage, non-potable ground water, or water mixed with clean water and sewage. The sewage is condensed water after the gas is discharged, surface sewage produced during construction, sewage produced by gas purification and fuel air treatment, or natural precipitation. The natural precipitation is rainwater and snow water. Purified water is obtained after the sewage is purified, and the purified water is transported to the underground fuel gasification reaction zone. The purification treatment can be carried out by sewage sedimentation, sewage filtration, or sewage sedimentation and filtration.

This embodiment adopts the technical means that the water transported to the underground fuel gasification reaction zone is clean water or sewage or mixed water from clean water and sewage, so it can not only turn waste into wealth, but also save a lot of water resources, Moreover, it is beneficial to protect the environment. In addition, because the sewage is purified and treated to obtain purified water, and the purified water is transported to the underground fuel gasification reaction zone, the negative impact on the gasification furnace can be greatly reduced without affecting the gasification process. Normal combustion and gasification of the furnace to avoid extinguishing the gasification furnace. Also, because the technical means that the purification treatment is carried out by sewage sedimentation and/or filtration are adopted, the cost of sewage purification treatment can be greatly reduced.

As a further improvement of this embodiment, as shown in Figure 8 and Figure 10, the gas-water ratio and the retreat time and speed of the gas injection point in the gasification reaction zone are adjusted by using the exhausted gas components and the temperature of the gasification reaction zone as indicators to realize Continuous retreat and cycle gasification, so as to realize continuous and stable underground gasification process.

After several cycles, when the gas injection point in the gasification reaction zone retreats to the coal inlet point, stop the gas injection, inject only water, use the waste heat in the gasification reaction zone to decompose water vapor, and recover water gas while reducing the temperature of the gasification reaction zone. Further improve the thermal efficiency of the gasification process.

Before the gasification reaction is carried out, the self-combustible gas and the supporting gas are separated and transported to the underground fuel gasification reaction zone, and then the spontaneous combustion gas and the supporting gas are mixed and burned to ignite the fuel in the underground fuel gasification reaction zone.

The supporting gas is oxygen-enriched and/or pure oxygen and/or air, and the underground fuel is coal seam, oil layer or oil shale layer with medium and low calorific value.

The water is atomized along the radial and axial directions respectively, and the radial water vapor is sprayed to the well wall or coal wall to prevent backfire and combustion of the coal seam. The axial water vapor is mixed with oxygen-enriched or pure oxygen as a gasification agent underground and sprayed to the gasification reaction zone.

Specifically, as shown in Figure 2, the separation of the double casings controls the retreat of the gas injection point - the starting position of the nozzle of the water atomization device is 1-10 meters away from the gas collection cavity in the directional horizontal well, and the inert gas is first used to replace the gas in the inner casing. Air, and then inject self-igniting gas from the inner casing, and inject air into the annular space of the inner and outer casings. The self-igniting gas meets the air in the mixing nozzle and burns to ignite the coal seam. Adjust the excess coefficient of air flow between 1.5-2. When the outlet gas group When the neutralized effective gas (H ₂ +CO+CH ₄ ) reaches 25% and the temperature of the nozzle reaches the ignition point of the coal seam, stop injecting the spontaneous combustion gas, replace the spontaneous combustion gas in the inner casing with an inert gas, and switch to injecting oxygen-enriched or oxygen, and the inner and outer casings The annular space of the pipe is switched to inject water and enter the normal gasification stage.

Adjust the oxygen-enriched or oxygen flow rate to reach the design production value, and detect the gas composition at the outlet. When the hydrogen content in the gas composition is greater than 30%, continue to inject oxygen-enriched or oxygen; when the hydrogen content in the gas composition is less than 30%, and the CO content is greater than At 10%, start the water pump to inject water, gradually increase the water injection volume, and control the volume ratio of air volume to water volume below 500:1.

When the gas-water ratio is close to 500:1, continuously detect the outlet gas composition and nozzle temperature, and when the effective gas (H ₂ +CO+CH ₄ ) of the outlet gas composition is greater than 45%, continue to maintain the gas-water ratio gasification; When the effective gas (H ₂ +CO+CH ₄ ) of the outlet gas composition is less than 45%, and the temperature of the nozzle is greater than 200 degrees, start the gas injection point retreat operation.

When the effective gas (H ₂ +CO+CH ₄ ) of the outlet gas component is less than 45% and the nozzle temperature is greater than 200 degrees, a control signal is given to start the hydraulic system, open the blowout prevention box, and the injection head pulls the double casing at the same time The water atomization device makes the gas injection point retreat continuously, the turntable rotates, and the double casing is retracted.

Control the backward movement distance from 0.5m to Lm (L=(1-3)H, H is the coal seam thickness, m), when the temperature of the nozzle is close to the ground temperature, stop the movement of the injection head and the turntable, close the blowout prevention box, and stop the injection at the same time Water, to achieve a movement and circulation.

With the same control process, after multiple cycles, when the nozzle moves to the coal entry point of the directional hole, the gas injection is stopped, water is injected, and the waste heat and pressure of the gasifier are used to decompose water vapor, while reducing the furnace temperature. , recover water gas, and further improve the thermal efficiency of the gasification process.

Under the condition of water injection, when the gas volume at the outlet of the gasifier is less than 100m ³ /h, the water injection is stopped and the gasification process ends. A double-casing separated control gas injection point receding-water atomization device is proposed.

This embodiment adopts the technical means of adjusting the gas-water ratio and the time and speed of the gas injection point in the gasification reaction zone taking the discharged gas components and the temperature of the gasification reaction zone as indicators. It can be determined whether the fuel in the underground fuel gasification reaction zone is burnt out, and it can also be judged according to the temperature of the gasification reaction zone whether the fuel in the underground fuel gasification reaction zone is still burning, so that in the underground fuel gasification reaction When the fuel in the zone is about to burn out and is still in the burning state, without repeating the ignition process, the gas injection point can be continuously retreated and gasified continuously, so as to realize the continuous and stable underground gasification process and improve the underground fuel gasification reaction. Under the premise of improving the fuel utilization rate in the area, the production efficiency of gas is improved.

As shown in Figures 3 to 6, a gasifying agent delivery pipe 3 includes a water delivery pipe 3-1 and a gas delivery pipe 3-2, and the water delivery pipe 3-1 and the gas delivery pipe 3-2 are combined together, so that The lumen of the water delivery pipe 3-1 and the lumen of the gas delivery pipe 3-2 are isolated from each other. When the gasifying agent delivery pipe changes from a straight state to a curved state or from a curved state to a straight state, the The lumen of the tube 3-1 and the lumen of the air delivery tube 3-2 are respectively in a conduction state.

In this embodiment, since the gasification agent delivery pipe is adopted, the water delivery pipe and the gas delivery pipe are combined, and the lumen of the water delivery pipe and the lumen of the gas delivery pipe are isolated from each other. When the gasifying agent conveying pipe changes from a straight state to a curved state or from a curved state to a straight state, the lumen of the water conveying pipe and the lumen of the gas conveying pipe are respectively in the conducting state, so there is no need to consume The external pressure energy can transport the water to the underground fuel gasification reaction zone. At the same time, only a small amount of external pressure energy can be used to transport the supporting gas to the underground fuel gasification reaction zone. In the gasification reaction zone, water and combustion-supporting gas are mixed to form atomized gasification agent to provide necessary conditions, thereby realizing the normal and stable underground gasification process and greatly reducing production costs.

As an improvement of this embodiment, as shown in Fig. 3 to Fig. 4, the air delivery pipe 3-2 is located in the water delivery pipe 3-1, of course, the water delivery pipe 3-1 may also be It is located in the gas delivery pipe 3-2. It can also be as shown in Figure 3, the gas delivery pipe 3-2 is connected in parallel with the water delivery pipe 3-1; more can be as shown in Figure 4, the gasification agent delivery pipe 3 is provided with a continuous The axial partition 3-4, the axial partition divides the inner chamber of the gasification agent delivery pipe 3 into two sub-chambers, wherein one of the sub-chambers constitutes the water delivery pipe 3- 1 lumen, and the other sub-lumen constitutes the lumen of the air delivery tube 3-2.

As a preference, as shown in Figures 3 to 4, the cross-section of the water delivery pipe 3-1 is circular, or oval, or as shown in Figures 5 to 6. The shape of the cross section of the tube 3-1 is rectangular or square. Similarly, as shown in Fig. 3 to Fig. 5, the cross-section of the gas conveying pipe 3-2 is circular or elliptical. Alternatively, as shown in Figures 5 to 6, the shape of the cross section of the air delivery pipe 3-2 is rectangular or square. Obviously, it is also possible that the cross-section of the water delivery pipe 3-1 is circular, and the cross-section of the air delivery pipe 3-2 is square. It is also possible that the water delivery pipe 3-1 is The shape of the cross section is square, and the shape of the cross section of the air delivery pipe 3-2 is circular. There are many other similar combinations.

In this embodiment, the air delivery pipe is located in the water delivery pipe or the water delivery pipe is located in the air delivery pipe; or, the air delivery pipe and the water delivery pipe are connected in parallel; or, the A continuous axial partition is arranged in the gasification agent delivery pipe, and the axial partition divides the inner chamber of the gasification agent delivery pipe into two sub-chambers, wherein one of the sub-chambers constitutes the water The inner chamber of the delivery pipe and the other sub-chamber constitute the technical means of the inner cavity of the gas delivery pipe. Therefore, a variety of gasification agent delivery pipes can be produced according to different needs of customers.

As a further improvement of this embodiment, as shown in FIGS. 3 to 6 , the inner cavity of the water delivery pipe 3 - 1 is provided with support frames 3 - 3 at intervals. The inner cavity of the air delivery tube 3-1 is provided with support frames 3-3 at intervals.

This embodiment adopts the technical means that the inner cavity of the water delivery pipe is provided with supporting frames at intervals; and/or, the inner cavity of the air delivery pipe is provided with the technical means of supporting frames at intervals, so the water can be effectively prevented. When the inner cavity of the delivery pipe and the inner cavity of the gas delivery pipe are in a bent state, they are closed to block the passages of water and combustion-supporting gas, and at the same time, the winding of the gasification agent delivery pipe is not hindered.

As a further improvement of this embodiment, as shown in FIGS. 3 to 9 , the outlet end of the gasification agent delivery pipe 3 is provided with an atomizing mixing nozzle 4 . The atomization mixing nozzle 4 is an anti-tempering atomization mixing nozzle 4, and the anti-tempering atomization mixing nozzle 4 is provided with a gas mixing head 4-1, and the gas mixing head 4-1 has a hemispherical front end Cylindrical shell, the front end of the gas mixing head 4-1 is distributed with a plurality of nozzles 4-2, and a thermocouple hole is also arranged at the front end of the gas mixing head 4-1; the rear end of the gas mixing head 4-1 is connected to a The front end of the connecting pipe 4-4, the center of the connecting pipe 4-4 is provided with a combustion-supporting agent injection hole 4-5, and the rear end of the combustion-supporting agent injection hole 4-5 extends backward to form a combustion-supporting agent connecting pipe 4- 12. A plurality of axial atomization nozzle holes 4-6 are arranged around the combustion aid injection hole 4-5 on the intermediate connecting pipe 4-4, and a thermocouple is also arranged on the intermediate connecting pipe 4-4 along the axial direction Through hole, the outer diameter of the connecting pipe 4-4 is provided with an outer spray cone, the diameter of the front end of the outer spray cone is larger than the diameter of the rear end; the rear end of the connecting pipe 4-4 is connected to a water injection nozzle 4 -7, the inner cavity of the water injection connecting pipe 4-7 communicates with the axial atomization spray hole 4-6 and the thermocouple through hole of the intermediate connecting pipe 4-4, and the front end of the water injection connecting pipe 4-7 is provided with The front cone surface corresponding to the outer spray cone surface of the intermediate connecting pipe 4-4 is provided with a spray gap between the front cone surface of the water injection connecting pipe 4-7 and the outer spray cone surface of the intermediate connecting pipe 4-4 , form a slit nozzle 4-9, and a radial atomization nozzle 4-8 connecting the slit nozzle 4-9 and the inner cavity of the water injection nozzle 4-7 is provided on the water injection nozzle 4-7; the combustion aid nozzle 4 -12 passes through the inner cavity of the water injection connecting pipe 4-7; the anti-tempering atomization mixing nozzle 4 is also provided with a port tee 4-13, and the port tee 4-13 is provided with a communication port, a water inlet 4-10, The gas-supporting interface, the communication port communicates with the water injection pipe, the gas-supporting interface passes through the air inlet 4-11 of the gas-supporting pipe 4-12, and the air inlet 4-11 communicates with the gas The air outlet of the delivery pipe 3-2, the water inlet 4-10 is connected to the water outlet of the water delivery pipe 3-1; the thermocouple 4-3 is installed in the thermocouple hole of the gas mixing head 4-1 , the wire 61 of the thermocouple 4-3 passes through the thermocouple through hole of the intermediate connecting pipe 4-4, and the inner cavity of the water injection connecting pipe 4-7 is drawn out from the gas-supporting interface of the port tee 4-13.

In this embodiment, since the outlet end of the gasification agent delivery pipe is provided with an atomizing mixing nozzle, the water delivered to the underground fuel gasification reaction zone can Atomization is carried out through the atomization mixing nozzle, and the water vapor generated after atomization is mixed with the supporting gas transported to the underground fuel gasification reaction zone to form a mist gasification agent. And because the atomization mixing nozzle is adopted as the technical means of preventing backfire atomization mixing nozzle, so, in the process of gasification reaction, it can prevent the generated gas from flowing to the side of gasification furnace inlet hole and burning to cause backfire, causing To protect the anti-temper atomization mixing nozzle. Also due to the adoption of the anti-tempering atomization mixing spray head, a gas mixing head is provided, and the gas mixing head is a cylindrical shell with a hemispherical front end, and a plurality of nozzles are distributed at the front end of the gas mixing head. The front end is also provided with a thermocouple hole; the rear end of the gas mixing head is connected to the front end of a connecting pipe, and the center of the connecting pipe is provided with a combustion aid injection hole, and the rear end of the combustion aid injection hole extends backward A combustion aid connecting pipe is formed, and a plurality of axial atomization nozzles are arranged around the combustion aid injection hole on the central connecting pipe, and a thermocouple through hole is also arranged on the central connecting pipe along the axial direction. The diameter of the outer spray cone is set on the diameter of the outer spray cone, and the diameter of the front end of the outer spray cone is larger than the diameter of the rear end; The axial atomization nozzle hole and the thermocouple through hole are connected, and the front end of the water injection connecting pipe is provided with a front cone surface corresponding to the outer spray cone surface of the intermediate connecting pipe. A spray gap is provided between the outer spray cones of the water injection nozzle to form a slit nozzle, and a radial atomization nozzle hole connecting the slit nozzle and the inner cavity of the water injection nozzle is provided on the water injection nozzle; the combustion aid nozzle passes through the water injection nozzle. Inner cavity; the anti-tempering atomization mixing nozzle is also provided with a port tee, the port tee is provided with a communication port, a water inlet, and a gas-supporting interface, the communication port is connected with the water injection connection, and the gas-supporting interface passes through There is an air inlet of the gas-supporting pipe, the air inlet is connected to the gas outlet of the gas delivery pipe, and the water inlet is connected to the water outlet of the water delivery pipe; The couple hole is equipped with a thermocouple, the wire of the thermocouple passes through the thermocouple through hole of the intermediate connecting pipe, and the inner cavity of the water injection connection pipe is drawn from the gas-supporting interface of the port tee. Therefore, it can not only prevent backflow In addition, the temperature of the underground fuel gasification reaction zone can be detected in real time. When the fuel in the underground fuel gasification reaction zone is about to burn out and is still in the burning state, the injection process can be realized without repeating the ignition process. The continuous receding and continuous gasification of the gas point can realize the continuous and stable underground gasification process, and improve the production efficiency of gas under the premise of improving the fuel utilization rate in the underground fuel gasification reaction zone.

As shown in Figures 1 to 9, an underground fuel gasification system includes an underground gasification furnace 2, and the underground gasification furnace 2 has a furnace chamber 2-1 located in the coal seam 1, and the furnace chamber 2-1 The air intake hole 2-2 connected to the ground, the air outlet hole 2-3 communicated with the furnace chamber 2-1 and led to the ground, and the furnace chamber 2-3 can be advanced and retreated from the air intake hole 2-2. The gasification agent delivery pipe in 1, the gasification agent delivery pipe is the aforementioned gasification agent delivery pipe 3, the atomization mixing nozzle 4 is located in the furnace chamber 2-1, and the furnace chamber 2-1 Located in front of the atomizing mixing nozzle 4 is the underground fuel gasification reaction zone 2-4, the water inlet of the water delivery pipe 3-1 in the gasification agent delivery pipe 3 communicates with the water source, and the gasification agent delivery pipe 3 The air inlet of the middle gas conveying pipe 3-2 is connected with the gas-supporting source, and the air outlet 2-3 is connected with the air inlet of the water-gas separator 12 .

In this embodiment, because the gasification agent delivery pipe is the aforementioned gasification agent delivery pipe, the atomization mixing nozzle is located in the furnace cavity, and the inlet of the water delivery pipe in the gasification agent delivery pipe is The water inlet is communicated with the water source, and the air inlet of the gas conveying pipe in the gasification agent conveying pipe is communicated with the gas-supporting gas source. Therefore, water can be transported to the underground fuel gasification reaction zone without consuming external pressure energy. Consuming a small amount of external pressure energy, the assisted gas can be transported to the underground fuel gasification reaction zone, and water and assisted gas can be mixed in the underground fuel gasification reaction zone to form a mist gasification agent without heat to realize underground gasification The process is normal and stable, greatly reducing production costs.

As an improvement of this embodiment, as shown in Figure 8, the sewage outlet of the water-gas separator 12 is connected to the sewage inlet of the sewage sedimentation tank 13, and the purified water outlet of the sewage sedimentation tank 13 is connected to a frequency conversion sewage pump 14, the water outlet of the frequency conversion sewage pump 14 is connected to the water inlet of the water delivery pipe 3-1, the water outlet of the frequency conversion sewage pump 14 and the water inlet of the water delivery pipe 3-1 It is equipped with a pressure gauge 17 and a flow gauge 16.

As a preference, as shown in Figure 8, the sewage settling tank 13 is provided with a filter device 13-1, and the filter device 13-1 is located at the sewage inlet of the sewage settling tank 13 and at the end of the sewage settling tank 13. between purified water outlets.

In this embodiment, since the sewage outlet of the water-gas separator is connected to the sewage inlet of the sewage sedimentation tank, the purified water outlet of the sewage sedimentation tank is connected to the water inlet of the frequency conversion sewage pump, and the water outlet of the frequency conversion sewage pump The technical means of connecting the water inlet of the water delivery pipe not only turns waste into wealth and saves a lot of water resources, but also helps protect the environment, and at the same time, can greatly reduce the negative impact on the gasifier. It does not affect the normal combustion and gasification of the gasification furnace, avoids the extinguishment of the gasification furnace, and can greatly reduce the cost of purifying sewage.

As an improvement of this embodiment, as shown in Fig. 8 and Fig. 10, the gas outlet of the water-gas separator 12 is connected with the gas inlet of the gas component measuring instrument 15, and the rear part of the gasifying agent delivery pipe 3 Winding by the delivery pipe reel device 7, the front part of the gasification agent delivery pipe 3 is sent underground through the delivery pipe drive device 5 and the blowout preventer 5-1, the hydraulic interface of the delivery pipe reel device 7 is connected to The hydraulic interface of the first hydraulic cylinder 11-1 in the hydraulic station 11 is connected through the oil circuit, and the hydraulic interface of the delivery pipe driving device 5 is connected with the hydraulic interface of the second hydraulic cylinder 11-1 in the hydraulic station 11 through the oil circuit. The hydraulic interface of the blowout preventer 5-1 communicates with the hydraulic interface of the second hydraulic cylinder 11-1 in the hydraulic station 11 through an oil circuit, and the three hydraulic cylinders 11-1 are respectively controlled by three control valves 11-2, The control signal input terminals of the three control valves 11-1 are respectively electrically connected to the three control signal output terminals of the controller 18, and the signal output terminals of the gas component measuring instrument 15 are connected to the signal input terminals of the controller 18. Terminals are electrically connected, and the signal output terminal of the thermocouple 4-3 is electrically connected to the signal input terminal of the controller 18.

The inlet end of the gasification agent delivery pipe 3 is arranged on the upper center of the delivery pipe reel device 7 located on the ground, and the rear part of the gasification agent delivery pipe 3 is wound on the delivery pipe reel device 7, the conveying pipe reel device 7 is provided with a water-gas separation supply device 8, and the water outlet of the water-gas separation supply device 8 is connected with the water inlet of the water delivery pipe 3-1, and the water The gas outlet of the gas separation supply device 8 is connected with the air inlet of the gas delivery pipe 3-2, the gas inlet 4-11 of the water gas separation supply device 8 is connected with a gas source, and the water gas separation supply The water inlet 4-10 of the device 8 is connected with a water source, and the top of the air inlet 2-2 is sequentially provided with a guide groove 6, a blowout preventer 5-1, and a delivery pipe driving device 5. The delivery pipe The front part of the reel device 7 passes through the guide groove 6, driven by the delivery pipe driving device 5, passes through the blowout preventer 5-1, and extends into the air inlet 2-2 and Inside the furnace chamber 2-1.

As shown in Figure 9, the gasifier has one or more directional wells (i.e. air intake holes 2-2) and two or more gas outlet wells (i.e. air outlet holes 2-3), and the gas outlet wells can be Vertical wells can also be directional deviated wells. The gas collection chamber 2-5 is formed by fracturing or dry distillation of two or more gas outlet wells. In the directional well, a double-casing separation control gas injection point retreat-water atomization device is installed.

In this embodiment, since the gas outlet of the water-gas separator is connected with the gas inlet of the gas component measuring instrument, the rear part of the gasification agent delivery pipe is wound by the delivery pipe reel device, and the gasification The front part of the agent delivery pipe is sent into the ground through the delivery pipe driving device and the blowout preventer. The hydraulic interface of the delivery pipe reel device communicates with the hydraulic interface of the first hydraulic cylinder in the hydraulic station through the oil circuit. The delivery pipe drives The hydraulic interface of the device communicates with the hydraulic interface of the second hydraulic cylinder in the hydraulic station through the oil circuit, the hydraulic interface of the blowout preventer communicates with the hydraulic interface of the second hydraulic cylinder in the hydraulic station through the oil circuit, and the three hydraulic cylinders Controlled by three control valves respectively, the control signal input terminals of the three control valves are respectively electrically connected with the three control signal output terminals of the controller, and the signal output terminals of the gas component measuring instrument are connected with the controller’s The signal input end is electrically connected, and the signal output end of the thermocouple is electrically connected to the signal input end of the controller. Therefore, it is not only possible to determine whether the fuel in the underground fuel gasification reaction zone is In addition, it can also be judged according to the temperature of the gasification reaction zone whether the fuel in the underground fuel gasification reaction zone is still burning, so that the fuel in the underground fuel gasification reaction zone is still burning In this state, there is no need to repeat the ignition process, and the gas injection point can be continuously retreated and gasified continuously, so as to realize the continuous and stable underground gasification process. Productivity.

Claims (4)

1. A gasifying agent delivery pipe (3), characterized in that: the gasifying agent conveying pipe (3) comprises a water conveying pipe (3-1) and an air conveying pipe (3-2), the water conveying pipe (3-1) and the air conveying pipe (3-2) are combined together, a pipe cavity of the water conveying pipe (3-1) and a pipe cavity of the air conveying pipe (3-2) are mutually isolated, and when the gasifying agent conveying pipe is changed from a linear state to a bent state or from the bent state to the linear state, the pipe cavity of the water conveying pipe (3-1) and the pipe cavity of the air conveying pipe (3-2) are respectively in a conducting state.

2. Gasification agent duct (3) according to claim 1, characterized in that:

the air delivery pipe (3-2) is positioned in the water delivery pipe (3-1) or the water delivery pipe (3-1) is positioned in the air delivery pipe (3-2); or,

the air conveying pipe (3-2) is connected with the water conveying pipe (3-1) in parallel; or,

and continuous axial partition plates (3-4) are arranged in the gasifying agent conveying pipe (3), and divide the inner cavity of the gasifying agent conveying pipe (3) into two sub-inner cavities by the axial partition plates, wherein one sub-inner cavity forms the inner cavity of the water conveying pipe (3-1), and the other sub-inner cavity forms the inner cavity of the air conveying pipe (3-2).

3. Gasification agent duct (3) according to claim 1, characterized in that: the inner cavity of the water delivery pipe (3-1) is provided with supporting frameworks (3-3) at intervals; and/or the inner cavity of the air delivery pipe (3-1) is provided with a support framework (3-3) at intervals.

4. An underground fuel gasification system, comprising an underground gasification furnace (2), wherein the underground gasification furnace (2) is provided with a furnace chamber (2-1) positioned in a coal seam (1), an air inlet hole (2-2) communicated with the furnace chamber (2-1) and leading to the ground, an air outlet hole (2-3) communicated with the furnace chamber (2-1) and leading to the ground, and a gasification agent conveying pipe extending into the furnace chamber (2-1) from the air inlet hole (2-2) in a retractable way, and is characterized in that: the gasifying agent conveying pipe is the gasifying agent conveying pipe (3) according to any one of claims 1 to 3, an atomizing and mixing nozzle (4) is arranged in the furnace chamber (2-1), a water inlet of the water conveying pipe (3-1) in the gasifying agent conveying pipe (3) is communicated with a water source, an air inlet of the gas conveying pipe (3-2) in the gasifying agent conveying pipe (3) is communicated with a combustion-supporting gas source, and an air outlet (2-3) is communicated with an air inlet of the water-gas separator (12).