Electric furnace and gasification method for underground coal and coal gangue power generation in mines

Abstract

The present invention specifically discloses an underground coal and gangue power generation electrification furnace and a gasification method in a mine. The power generation electrification furnace is arranged in an underground coal seam, and a mine main tunnel, an operation tunnel, an equipment tunnel and a transportation tunnel are excavated. A gas injection chamber is excavated in the mine main tunnel, and a gas injection pipe is connected to a gasification channel. A scraper conveyor is installed in the transportation tunnel for coal gangue transportation. A manual operation room is excavated at the end. Two chambers are excavated in the equipment tunnel, namely a turbine power generation chamber and a gas delivery chamber, and a hot water power generation chamber and a water body pumping chamber, which are respectively connected to a gas collecting pipe and a heat collecting pipe. A supporting isolation wall is established around the gasification working face, and a gas collecting tunnel and a plurality of gasification channels are reserved inside. An electronic igniter is arranged at the lower end of the gasification channel, and a gas injection pipe and a heat collecting pipe are connected in the channel. A plurality of double-layer isolation doors are installed on the upper part of the supporting isolation wall. When the gasifier is in use, coal or gangue can be gasified, and it has the characteristics of recycling and full energy utilization.

Description

Technical Field

[0001] The invention relates to the technical field of underground coal gasification, and in particular to an underground coal and gangue gasification furnace and a gasification method. Background Art

[0002] The underground coal gasification technology is a process that changes the physical mining of coal seams in the ground into chemical gas extraction. Its essence is to convert the useful substances in coal, such as volatile matter and fixed carbon, into combustible gas through physical and chemical transformations such as pyrolysis, combustion, and gasification. It has the advantages of low gas production cost, high safety, and good environmental benefits. Therefore, underground coal gasification is first of all a method of coal development and an innovation of traditional coal mining methods. At the same time, this technology has broad application prospects in the mining and utilization of residual coal such as low-quality high-sulfur, high-ash, steeply inclined, thin coal seams, deep coal seams, "three-down" compressed coal, and conventional technical and economically unminable coal.

[0003] However, at present, underground coal gasification has not yet achieved industrialized production, mainly because the mining and support costs of underground coal gasification furnaces are high, and most of them are disposable gasification furnaces, and the residual heat is difficult to use and control, resulting in difficulties in management and maintenance, and it is difficult to support the gasification furnace after use. Therefore, in order to solve the problems faced by underground gasification furnaces in mines at this stage, the present invention provides a reusable, stable-supported, and fully energy-utilizing underground power generation gasification furnace and gasification method. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides an electrification furnace and a gasification method for generating electricity from coal and coal gangue underground in a mine.

[0005] The technical solution provided by the present invention is:

[0006] The gasifier is arranged in the underground coal seam, and a mine main tunnel, an operation tunnel, an equipment tunnel, and a transportation tunnel are excavated. A gas injection chamber is excavated in the mine main tunnel, and a gas injection pipe is connected to the gasification channel. A scraper conveyor is installed in the transportation tunnel for conveying coal gangue. A manual operation room is excavated at the end. Two chambers are excavated in the equipment tunnel, namely a turbine power generation chamber and a gas delivery chamber, a hot water power generation chamber and a water body pumping chamber, which are respectively connected to a gas collecting pipe and a heat collecting pipe. A support isolation wall is established around the gasification working face, and a gas collecting tunnel and multiple gasification channels are reserved inside. An electronic igniter is arranged at the lower end of the gasification channel, and the gas injection pipe and the heat collecting pipe are connected in the channel, and multiple double-layer isolation doors are installed on the upper part of the support isolation wall;

[0007] When the gasifier is operated for the first time, the gasification working face is a coal seam structure, the double-layer isolation door is closed, the heat collecting pipe and the gas injection pipe are opened to form a water and gas circulation, the electronic igniter is started to ignite the coal seam and the gas, and the temperature of the gasifier is adjusted by controlling the gas in the gas injection pipe. The prepared high-temperature gas is transported to the turbine power generation room through the gas collecting pipe in the gas collecting lane for power generation and cooling, and then pressurized through the gas conveying room to the main lane of the mine. After the water in the heat collecting pipe is heated, it flows to the hot water power generation room for power generation and cooling, and then pressurized through the water pumping room to complete the water circulation. After the combustion of the gasification working face is completed, the inert gas is switched in the gas injection pipe. After the safety is confirmed in the gasifier, the inert gas is recovered, and the operation of the gas collecting pipe and the heat collecting pipe is stopped;

[0008] After the coal body in the gasifier is burned, the safety of the furnace is confirmed, the double-layer isolation door is opened, the combustion residue is piled and compacted, and the coal gangue is transported to the gasification working face by a scraper conveyor. After the gangue is piled up, the double-layer isolation door is re-closed, the heat collecting pipe and the gas injection pipe are opened, the coal gangue is ignited by an electronic lighter, high-temperature gas is prepared, gas transportation and water circulation are carried out again, and after gasification is completed, the safety of the furnace is confirmed, the combustion residue is piled and compacted, and the coal gangue is transported again for gasification until the gasifier is abandoned.

[0009] Furthermore, equipment chambers and manual operation rooms should meet emergency evacuation standards.

[0010] Furthermore, the residue in the gasifier can be cleaned or piled and compacted.

[0011] Furthermore, the gas in the gas injection pipe can be switched and adjusted according to the gasification process, and gasifying agent, water vapor, inert gas, etc. can be added.

[0012] Furthermore, when the gangue is piled up, some coal blocks can be mixed in according to the quality of the gangue.

[0013] Furthermore, the electronic igniter is made of a high-resistance resistance wire wound around a flammable material.

[0014] Furthermore, temperature sensors and gas sensors are installed at intervals in the gasification channel to monitor changes in the gasification furnace for manual control.

[0015] Furthermore, air holes are evenly distributed on the walls of the gas injection pipe and the gas collecting pipe in the supporting isolation wall.

[0016] Furthermore, the supporting isolation wall has a high temperature insulation coating inside and a flame retardant attached to the surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The invention is a schematic structural diagram of an underground coal and gangue power generation electrification furnace and a gasification method for realizing the invention.

[0018] In the figure: 1 is the operation tunnel; 2 is the double-layer isolation door; 3 is the gas collecting pipe; 4 is the heat collecting pipe; 5 is the turbine power generation room; 6 is the gas transportation room; 7 is the equipment tunnel; 8 is the support isolation wall; 9 is the hot water power generation room; 10 is the water pumping room; 11 is the electronic igniter; 12 is the gas injection pipe; 13 is the scraper conveyor; 14 is the manual operation room; 15 is the gas collecting tunnel; 16 is the transportation tunnel; 17 is the gasification channel; 18 is the gasification working face; 19 is the gas injection chamber; 20 is the main tunnel of the mine. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] The gasifier is arranged in the underground coal seam, and a mine main tunnel 20, an operation tunnel 1, an equipment tunnel 7, and a transportation tunnel 16 are excavated. A gas injection chamber 19 is excavated in the mine main tunnel 20, and a gas injection pipe 12 is connected to the gasification channel 17. A scraper conveyor 13 is installed in the transportation tunnel 16 for conveying coal gangue, and a manual operation room 14 is excavated at the end. Two chambers are excavated in the equipment tunnel 7, namely a turbine power generation chamber 5 and a gas delivery chamber 6, a hot water power generation chamber 9 and a water body pumping chamber 10, which are respectively connected to a gas collecting pipe 3 and a heat collecting pipe 4. A support isolation wall 8 is established around the gasification working face 18, and a gas collecting tunnel 15 and a plurality of gasification channels 17 are reserved inside. An electronic igniter 11 is arranged at the lower end of the gasification channel 17, and the gas injection pipe 12 and the heat collecting pipe 4 are connected in the channel, and a plurality of double-layer isolation doors 2 are installed on the upper part of the support isolation wall 8;

[0021] When the gasifier is operated for the first time, the gasification working face 18 is a coal seam structure, the double-layer isolation door 2 is closed, the heat collecting pipe 4 and the gas injection pipe 12 are opened to form a water and gas cycle, the electronic igniter 11 is started to ignite the coal seam and gas, and the temperature of the gasifier is adjusted by controlling the gas in the gas injection pipe 12. The prepared high-temperature gas is transported to the turbine power generation chamber 5 through the gas collecting pipe 3 in the gas collecting tunnel 15 for power generation and cooling, and then pressurized through the gas delivery chamber 6 to the mine main tunnel 20. After the water in the heat collecting pipe 4 is heated, it flows to the hot water power generation chamber 9 for power generation and cooling, and then pressurized through the water pumping chamber 10 to complete the water cycle. After the combustion of the gasification working face 18 is completed, the inert gas is switched in the gas injection pipe 12, and the inert gas is recovered after the safety is confirmed in the gasifier, and the operation of the gas collecting pipe 3 and the heat collecting pipe 4 is stopped;

[0022] After the coal body in the gasifier is burned, the safety of the furnace is confirmed, the double-layer isolation door 2 is opened, the combustion residue is piled and compacted, and the coal gangue is transported to the gasification working face 18 by the scraper conveyor 13. After the gangue is piled up, the double-layer isolation door 2 is re-closed, the heat collecting pipe 4 and the gas injection pipe 12 are opened, and the electronic igniter 11 ignites the coal gangue to prepare high-temperature gas, and gas transportation and water circulation are carried out again. After the gasification is completed, the safety of the furnace is confirmed, the combustion residue is piled and compacted, and the coal gangue is transported again for gasification until the gasifier is abandoned.

[0023] Furthermore, the equipment chamber and the manual operation room 14 should meet emergency evacuation standards.

[0024] Furthermore, the residue in the gasifier can be cleaned or piled and compacted.

[0025] Furthermore, the gas in the gas injection pipe 12 can be switched and adjusted according to the gasification process, and gasifying agent, water vapor, inert gas, etc. can be added.

[0026] Furthermore, when the gangue is piled up, some coal blocks can be mixed in according to the quality of the gangue.

[0027] Furthermore, the electronic igniter 11 is made of a high-resistance resistance wire wound around a flammable material.

[0028] Furthermore, temperature sensors and gas sensors are installed at intervals in the gasification channel 17 to monitor changes in the gasification furnace for manual control.

[0029] Furthermore, air holes are evenly distributed on the walls of the gas injection pipe 12 and the gas collecting pipe 3 in the supporting isolation wall 8.

[0030] Furthermore, the supporting isolation wall 8 has a high-temperature heat-insulating coating inside and a flame retardant attached to the surface.

[0031] Of course, the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment. It should be noted that all equivalent substitutions and obvious deformation forms made by any technician familiar with the field under the guidance of this specification fall within the essential scope of this specification and should be protected by the present invention.

Claims

1. A method for gasifying coal and gangue in an underground coal mine electric furnace, characterized in that: The gasifier is arranged in the underground coal seam, and a mine main tunnel, an operation tunnel, an equipment tunnel, and a transportation tunnel are excavated. A gas injection chamber is excavated in the mine main tunnel, and the gas injection chamber is connected to the gasification channel. A scraper conveyor is installed in the transportation tunnel for conveying coal gangue. A manual operation room is excavated at the end of the transportation tunnel. Two chambers are excavated in the equipment tunnel, one chamber is provided with a turbine power generation chamber and a gas conveying chamber, and the other chamber is provided with a hot water power generation chamber and a water body pumping chamber, which are respectively connected to a gas collecting pipe and a heat collecting pipe. A supporting isolation wall is established around the gasification working face, and a gas collecting tunnel and a plurality of gasification channels are reserved inside. The gas collecting pipe extends into the gas collecting tunnel, and an electronic igniter is arranged at the lower end of the gasification channel. The gasification channel is connected to the gas injection pipe and the heat collecting pipe, and a plurality of double-layer isolation doors are installed on the upper part of the supporting isolation wall; When the gasifier is operated for the first time, the gasification working face is a coal seam structure, the double-layer isolation door is closed, the heat collecting pipe and the gas injection pipe are opened to form a water and gas circulation, the electronic igniter is started to ignite the coal seam and the gas, and the temperature adjustment of the gasifier is completed by controlling the gas in the gas injection pipe. The prepared high-temperature gas is transported to the turbine power generation room through the gas collecting pipe in the gas collecting lane for power generation and cooling, and then pressurized through the gas conveying room to the main lane of the mine. After the water in the heat collecting pipe is heated, it flows to the hot water power generation room for power generation and cooling, and then pressurized through the water pumping room to complete the water circulation. After the combustion of the gasification working face is completed, the inert gas is switched in the gas injection pipe. After the safety is confirmed in the gasifier, the inert gas is recovered, and the operation of the gas collecting pipe and the heat collecting pipe is stopped; After the coal body in the gasifier is burned, the safety of the furnace is confirmed, the double-layer isolation door is opened, the combustion residue is piled and compacted, and the coal gangue is transported to the gasification working face by a scraper conveyor. When the coal gangue is piled, some coal blocks can be mixed according to the quality of the coal gangue. After the coal gangue is piled, the double-layer isolation door is re-closed, the heat collecting pipe and the gas injection pipe are opened, the electronic igniter ignites the coal gangue, high-temperature gas is prepared, and gas transportation and water circulation are carried out again. After gasification is completed, the safety of the furnace is confirmed, the combustion residue is piled and compacted, and the coal gangue is transported again for gasification until the gasifier is abandoned.

2. The gasification method of underground coal and coal gangue in a coal mine electric furnace according to claim 1, characterized in that: The chamber and manual operation room mentioned above should meet the emergency refuge standards.

3. The gasification method of underground coal and coal gangue in a coal mine electric furnace according to claim 1, characterized in that: The gas in the gas injection pipe is switched and adjusted according to the gasification process.

4. The gasification method of underground coal and coal gangue in a coal mine electric furnace according to claim 1, characterized in that: The electronic igniter is made of a high-resistance resistance wire wound around a flammable material.

5. The gasification method of underground coal and coal gangue in a coal mine electric furnace according to claim 1, characterized in that: Temperature sensors and gas sensors are installed at intervals in the gasification channel to monitor changes in the gasification furnace for manual control.

6. The method for gasification of underground coal and coal gangue in an electric furnace for power generation in a mine according to claim 1, characterized in that: The walls of the gas injection pipe and the gas collecting pipe in the supporting isolation wall are evenly distributed with air holes.

7. The method for gasification of underground coal and coal gangue in an electric furnace for generating electricity from mines according to claim 1, characterized in that: The supporting isolation wall has a high-temperature heat-insulating coating inside and a flame retardant attached to the surface.

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