CN120312183B - Thin-layer coal in-situ fluidized mining device and method - Google Patents

Abstract

The invention belongs to the technical field of thin coal mining, and provides a thin coal in-situ fluidization mining device and method aiming at the difficult problem of thin coal seam mining. The device comprises an in-situ combustion module, an annular heat pipe module, a co-production power generation module and an earth surface cooling module, wherein the in-situ combustion module is used for continuously supplying air to a selected thin coal seam area, an ignition device is used for actively igniting the coal seam to form a stable in-situ combustion area and continuously releasing heat and generating high-temperature smoke, then a thermoelectric power generation component is used for efficiently converting the heat energy into electric energy by utilizing the heat energy released by the combustion of the coal seam and the upward-rising-temperature smoke, the earth surface cooling module at the top end of the heat pipe is used for recovering waste heat, and finally the co-production power generation module is connected with the air outlet end of the annular heat pipe and further used for generating power by a steam turbine, so that the multi-stage utilization of energy is realized. The technology solves the problem that the thin coal layer is difficult to develop, adopts an in-situ fluidization cogeneration mode, and has economy and operation simplicity while realizing the high-efficiency utilization of coal resources.

Description

Thin-layer coal in-situ fluidized mining device and method

Technical Field

The present invention belongs to the technical field of thin-bed coal mining, and in particular relates to an in-situ fluidized mining device and method for thin-bed coal.

Background Art

The in-situ development and utilization of thin-bed coal resources holds significant strategic value for improving comprehensive resource utilization and promoting the transition to clean energy. While thin-bed coal reserves are abundant, accounting for approximately 20% of recoverable coal reserves, mining these thin seams presents numerous challenges due to their limited thickness (generally less than 1.3 meters) and complex geological conditions (including faults and interbedded gangue).

Due to limited working space and the poor adaptability of mechanized equipment, tunnel excavation is difficult. Direct excavation of thin coal seams leads to an imbalance between mining efficiency and economic benefits. The yield per unit area of a thin coal seam is only one-third to one-half that of a medium-thick seam, while the cost per ton of coal is 30% to 50% higher. Furthermore, some mines "mine the thick and abandon the thin," resulting in resource utilization rates of less than 10% for thin seams.

For thin, difficult-to-mine coal seams, in-situ combustion gasification can be implemented to utilize low-grade and unmineable coal resources. However, while existing underground coal gasification technologies can achieve in-situ utilization of coal resources, they require complex drilling and gas collection systems, which are not only technically expensive and complex to operate, but also pose risks of leakage and explosion. Furthermore, these technologies face challenges in controlling the combustion rate and temperature of the coal seams, resulting in low thermal energy recovery efficiency. To fully utilize shallow, thin coal seams and realize in-situ utilization of coal resources, we propose an in-situ fluidized mining device and method for thin coal seams.

Summary of the Invention

The purpose of the present invention is to provide a thin-layer coal in-situ fluidized mining device and method to solve the above problems.

To achieve the above object, the present invention provides the following solutions:

A thin-layer coal in-situ fluidized mining device includes an annular heat pipe module, which includes an annular heat pipe and a temperature difference power generation component. The bottom end of the annular heat pipe is connected and arranged in the thin coal seam in-situ combustion zone, the top end of the annular heat pipe is located on the surface, and the top end of the annular heat pipe is heat-exchanged with a surface cooling module. The air outlet end of the annular heat pipe is connected to a cogeneration power generation module, and the cogeneration power generation module is heat-exchanged with the surface cooling module. The thin coal seam in-situ combustion zone is connected to the air outlet end of the in-situ combustion module, and the in-situ combustion module is arranged on the surface. The air inlet end of the in-situ combustion module is connected to the atmosphere. The in-situ combustion module sends surface air into the selected thin coal seam, and the ignition device actively ignites to form a thin coal seam in-situ combustion zone. The high-temperature flue gas generated by combustion is discharged into the cogeneration power generation module through the annular heat pipe module.

Optionally, the thermoelectric power generation component includes a thermoelectric power generation chip group tube and a cooling tube, the thermoelectric power generation chip group tube is coaxially sleeved on the inner side of the annular heat pipe, an exhaust pipe is provided on the inner side of the thermoelectric power generation chip group tube, and another thermoelectric power generation chip group tube is sleeved and fixed on the outer side of one end of the annular heat pipe located in the thin coal seam in-situ combustion zone, and the thermoelectric power generation chip group tube is arranged for heat exchange with the annular heat pipe;

The cooling pipe is sleeved on the outer side of one end of the annular heat pipe located on the ground surface, and the annular heat pipe and the cooling pipe are arranged for heat exchange;

The cooling pipe is provided with heat exchange arrangement with the surface cooling module;

The exhaust pipe is provided with ribs.

Optionally, the thermoelectric power generation chip group tube includes a pipeline, and a plurality of thermoelectric power generation chip groups are arranged along the height direction of the pipeline. The thermoelectric power generation chip group includes a plurality of thermoelectric power generation chips, and the thermoelectric power generation chips are embedded in the pipeline.

Optionally, a spiral stripe is provided on one side of the thermoelectric power generation chip located on the annular heat pipe, a copper sheet and a rib are connected to one side of the thermoelectric power generation chip located on the top of the annular heat pipe, and a heat exchange arrangement is established between the one side of the thermoelectric power generation chip located on the top of the annular heat pipe and the cooling pipe via the copper sheet and the rib;

The cooling pipe is arranged for heat exchange with the surface cooling module via coil 1.

Optionally, the gas outlet end of the cogeneration power generation module is connected to one end of coil 2, the coil 2 is heat exchanged with the surface cooling module, and the gas outlet end of the coil 2 is connected to the atmosphere.

Optionally, the coil 1 and the surface cooling module are both filled with cooling medium.

Optionally, the cooling medium is water.

Optionally, the annular heat pipe includes an annular heat pipe 1 located at the top, an annular heat pipe 2 located in the middle, and an annular heat pipe 3 located at the bottom, and the annular heat pipe 1, the annular heat pipe 2, and the annular heat pipe 3 are coaxially fixed;

The thermoelectric power generation chip set tubes are coaxially fixed in the annular heat pipe 1, the annular heat pipe 2, and the annular heat pipe 3, and two adjacent thermoelectric power generation chip set tubes are coaxially fixed;

The cooling pipe is sleeved on the outer side of the annular heat pipe 1 located at the top, and the cooling pipe is arranged for heat exchange with the annular heat pipe 1;

Another thermoelectric power generation chip group tube is sleeved and fixed on the outer side of the annular heat pipe three located at the bottom.

A thin-bed coal in-situ fluidized mining method, using the above-mentioned thin-bed coal in-situ fluidized mining device, comprises the following steps:

introducing air into the selected thin coal seam through the in-situ combustion module;

Actively igniting a shallow coal seam to form an in-situ combustion zone of the thin coal seam;

The bottom end of the annular heat pipe of the annular heat pipe module is arranged in the thin coal seam in-situ combustion zone, and the top end of the annular heat pipe is arranged on the ground surface;

Cooling the top of the annular heat pipe by the surface cooling module;

After the air is heated, high-temperature flue gas is formed. The high-temperature flue gas is passed through the annular heat pipe to the cogeneration power generation module to generate electricity. The exhaust gas of the cogeneration power generation module is cooled by the surface cooling module and then discharged.

The temperature difference power generation component of the annular heat pipe module generates electricity by generating a temperature difference.

Optionally, the temperature difference power generation component of the annular heat pipe module realizes the power generation step by generating a temperature difference. In the in-situ combustion zone of the thin coal seam, a temperature difference is generated on the outside of the annular heat pipe module to form an electromotive force; and a temperature difference is generated on the inside of the annular heat pipe module to form an electromotive force.

Compared with the prior art, the present invention has the following advantages and technical effects:

When in use, the bottom end of the annular heat pipe is set in the in-situ combustion zone of the thin coal seam, and the top end of the annular heat pipe is set on the surface; the top end of the annular heat pipe is cooled by the surface cooling module; air is introduced into the in-situ combustion zone of the thin coal seam through the in-situ combustion module to assist the coal seam combustion, and the degree of coal seam combustion can be controlled by changing the ventilation volume. The introduced air is heated to form high-temperature flue gas, which is passed from the annular heat pipe to the cogeneration power generation module for power generation. The exhaust gas of the cogeneration power generation module is cooled by the surface cooling module and then discharged; a temperature difference is generated between the inside and outside of the temperature difference power generation component to realize temperature difference power generation. Through the above-mentioned arrangement, the utilization efficiency of coal seam combustion heat can be significantly improved, the coal seam combustion heat energy can be converted into electrical energy in situ, and the mining cost can be reduced. In addition, the device has a simple structure, is easy to assemble, and has a low cost of use.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

FIG1 is a schematic structural diagram of the present invention;

FIG2 is a schematic structural diagram of an annular heat pipe module according to the present invention;

FIG3 is a bottom view of the annular heat pipe module structure of the present invention;

FIG4 is a cross-sectional view of an annular heat pipe according to the present invention;

FIG5 is a schematic diagram of a segmented design of an annular heat pipe module according to the present invention;

Among them, 1. Annular heat pipe module; 2. Cogeneration power generation module; 3. Surface cooling module; 4. In-situ combustion module; 1.1. Exhaust pipe; 1.2. Thermoelectric power generation chip group tube; 1.3. Annular heat pipe; 1.4. Cooling pipe.

DETAILED DESCRIPTION

The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

1 to 5 , the present invention discloses an in-situ fluidized mining device for thin-bed coal, comprising an annular heat pipe module 1, the annular heat pipe module 1 comprising an annular heat pipe 1.3 and a temperature difference power generation component, the bottom end of the annular heat pipe 1.3 being connected and arranged in the in-situ combustion zone of the thin coal seam, the top end of the annular heat pipe 1.3 being located on the ground surface, the top end of the annular heat pipe 1.3 being heat exchanged with a surface cooling module 3, the gas outlet end of the annular heat pipe 1.3 being connected with a cogeneration power generation module 2, the cogeneration power generation module 2 being heat exchanged with the surface cooling module 3, the in-situ combustion zone of the thin coal seam being connected with the gas outlet end of an in-situ combustion module 4, the in-situ combustion module 4 being arranged on the ground surface, the gas inlet end of the in-situ combustion module 4 being connected to the atmosphere, the in-situ combustion module 4 sending surface air into the in-situ combustion zone of the thin coal seam for heating, and then discharging the hot gas into the cogeneration power generation module 2 through the annular heat pipe module 1.

During use, the bottom end of the annular heat pipe 1.3 of the annular heat pipe module 1 is set in the in-situ combustion zone of the thin coal seam, and the top end of the annular heat pipe 1.3 is set on the surface; the top end of the annular heat pipe 1.3 is cooled by the surface cooling module 3; air is introduced into the in-situ combustion zone of the thin coal seam through the in-situ combustion module 4 to assist the coal seam combustion, and the degree of coal seam combustion can be controlled by changing the ventilation volume. The introduced air is heated to form high-temperature flue gas, which is passed from the annular heat pipe 1.3 to the cogeneration power generation module 2 for power generation. The exhaust gas of the cogeneration power generation module 2 is cooled by the surface cooling module 3 and then discharged; a temperature difference is generated between the inside and outside of the temperature difference power generation component to realize temperature difference power generation. Through the above-mentioned arrangement, the utilization efficiency of coal seam combustion heat can be significantly improved, the coal seam combustion heat energy can be converted into electrical energy in situ, and the mining cost can be reduced. In addition, the device has a simple structure, is easy to assemble, and has a low cost of use.

The in-situ combustion module 4 is selected as an air pump.

As an optional embodiment, the thermoelectric power generation component includes a thermoelectric power generation chip set tube 1.2 and a cooling tube 1.4. The thermoelectric power generation chip set tube 1.2 is coaxially sleeved inside an annular heat pipe 1.3. An exhaust pipe 1.1 is provided inside the thermoelectric power generation chip set tube 1.2. Another thermoelectric power generation chip set tube 1.2 is sleeved and fixed outside one end of the annular heat pipe 1.3 located in the thin coal seam in-situ combustion zone. The thermoelectric power generation chip set tube 1.2 and the annular heat pipe 1.3 are arranged for heat exchange.

The cooling pipe 1.4 is sleeved on the outer side of one end of the annular heat pipe 1.3 located on the ground surface, and the annular heat pipe 1.3 and the cooling pipe 1.4 are arranged for heat exchange;

The cooling pipe 1.4 is provided for heat exchange with the surface cooling module 3;

The exhaust pipe 1.1 is provided with ribs.

As an optional embodiment, the thermoelectric power generation chipset tube 1.2 includes a pipeline, and a plurality of thermoelectric power generation chipsets are arranged along the height direction of the pipeline. The thermoelectric power generation chipset includes a plurality of thermoelectric power generation chips, and the thermoelectric power generation chips are embedded in the pipeline.

As an optional embodiment, spiral stripes are provided on one side of the thermoelectric power generation chip located in the annular heat pipe 1.3. A copper sheet and ribs are connected to one side of the thermoelectric power generation chip located at the top of the annular heat pipe 1.3. The side of the thermoelectric power generation chip located at the top of the annular heat pipe 1.3 is heat-exchanged with the cooling pipe 1.4 via the copper sheet and ribs.

The cooling pipe 1.4 is arranged to exchange heat with the ground cooling module 3 through the coil 1.

Adding ribs to the high-temperature flue gas in the middle of the exhaust pipe 1.1 can be used to increase the heat exchange area and increase the heat exchange capacity; adding spiral grooves to the cold end side of the annular heat pipe module can cause the condensate to generate additional surface tension to increase its heat exchange capacity.

This device consists of an annular heat pipe module 1, a cogeneration power generation module 2, a surface cooling module 3, and an in-situ combustion module 4. The device is primarily based on a circulating power generation system. The annular heat pipe module 1 obtains heat through underground heat transfer pipes to achieve heat transfer. The annular heat pipe module 1 comprises an exhaust pipe 1.1, a thermoelectric power generation chip array pipe 1.2, annular heat pipes 1.3, and cooling pipes 1.4. The annular heat pipe module 1 exchanges heat with the coal fire in the combustion zone through the annular heat pipes 1.3, achieving heat transfer.

As an optional embodiment, the gas outlet of the cogeneration power generation module 2 is connected to one end of the coil 2, the coil 2 is heat exchanged with the surface cooling module 3, and the gas outlet of the coil 2 is connected to the atmosphere.

As an optional implementation, the coil 1 and the surface cooling module 3 are both filled with cooling medium.

As an optional implementation, the cooling medium is water.

The outer wall of the thermoelectric power generation chip group tube 1.2 is in direct contact with the heat source, and ribs are provided in the cold source to increase the heat exchange efficiency. The cold source is tightly connected to the thermoelectric power generation chip group tube 1.2 through copper sheets and ribs, and an electromotive force is generated by utilizing the temperature difference on both sides.

A cavity for the movement of a working medium is provided in the annular heat pipe 1.3. The working medium in the annular heat pipe 1.3 is preferably water.

The working fluid in the annular heat pipe 1.3 absorbs heat in the combustion zone, vaporizes, and returns to the surface. After being cooled by the cooling pipe at the cooling end of the annular heat pipe, it forms a cycle and falls back into the combustion zone. The working fluid in the cooling pipe is cooled by the surface cooling module and then circulates back to the cooling pipe, thereby integrating the annular heat pipe 1.3, the thermoelectric chipset tube 1.2, the exhaust pipe 1.1, and the cooling pipe 1.4 into a modular unit to achieve continuous and stable power generation.

The cogeneration power generation module 2 uses the flue gas generated by combustion in the combustion zone to drive the steam turbine to generate electricity and improve energy utilization efficiency. The specific working process is: the system adjusts the underground coal combustion intensity by supplying oxygen to the underground coal combustion zone through the in-situ combustion module 4 to ensure that the temperature difference power generation chip group tube 1.2 is at the optimal operating temperature difference.

The system uses water as the working fluid (due to its high heat capacity and environmentally friendly properties, it can effectively transfer heat and reduce energy loss). Coil 1 is installed in the surface cooling module 3. Circulating water in the surface cooling module 3 is used for heat exchange with the circulating water in coil 1. The top of the annular heat pipe 1.3 absorbs heat through the cooling pipe 1.4 and is then cooled. The heat enters the surface cooling module 3.

The combustion zone thermoelectric power generation chip set tube 1.2 generates electricity by utilizing the temperature difference formed between the annular heat pipe 1.3 and the exhaust pipe 1.1. The working fluid in the annular heat pipe 1.3 becomes gaseous after completing heat exchange in the combustion zone, is cooled by the cooling pipe, and then flows into the combustion zone to form a circulation. The surface thermoelectric power generation chip set tube 1.2 generates electricity by utilizing the temperature difference formed between the cooling pipe and the exhaust pipe.

The high-temperature flue gas completes heat exchange through the thermoelectric power generation chip group tube 1.2 and drives the cogeneration power generation module 2 to generate electricity, thereby improving energy utilization efficiency. In order to improve the cooling efficiency of the surface cooling module 3, the surface cooling module 3 adopts a cooling water radiator with a multi-circuit curved heat sink structure to increase the contact area between the cooling water and the pipeline. After passing through the cogeneration power generation module, the flue gas flows into the cooling end to extract heat and then is discharged.

As an optional embodiment, the annular heat pipe 1.3 includes an annular heat pipe 1 at the top, an annular heat pipe 2 at the middle, and an annular heat pipe 3 at the bottom, and the annular heat pipe 1, the annular heat pipe 2, and the annular heat pipe 3 are coaxially fixed;

Thermoelectric power generation chip group tubes 1.2 are coaxially fixed in the annular heat pipe 1, the annular heat pipe 2 and the annular heat pipe 3, and two adjacent thermoelectric power generation chip group tubes 1.2 are coaxially fixed;

The cooling pipe 1.4 is sleeved on the outside of the annular heat pipe 1 located at the top, and the cooling pipe 1.4 and the annular heat pipe 1 are arranged for heat exchange;

Another thermoelectric power generation chip group tube 1.2 is sleeved and fixed on the outer side of the annular heat pipe 3 located at the bottom.

To ensure optimal heat conduction between the thermoelectric chipset tube 1.2 and the heat pipe, multiple heat pipes are installed on the inner wall. The heat pipes are designed to be detachable so that they can be combined to accommodate thin layers of coal at different depths. The length of the heat pipes is optimized to minimize the number of connection points, thereby effectively reducing the risk of leakage and safety hazards.

The device is suitable for thin-layer coal fields and can realize in-situ combustion power generation, significantly reducing the cost of traditional coal mining and transportation.

A thin-bed coal in-situ fluidized mining method, using the above-mentioned thin-bed coal in-situ fluidized mining device, comprises the following steps:

Actively ignite shallow coal seams to form thin coal seam in-situ combustion zones;

The bottom end of the annular heat pipe 1.3 of the annular heat pipe module 1 is arranged in the thin coal seam in-situ combustion zone, and the top end of the annular heat pipe 1.3 is arranged on the ground surface;

The top of the annular heat pipe 1.3 is cooled by the surface cooling module 3;

Air is introduced into the in-situ combustion zone of the thin coal seam through the in-situ combustion module 4;

The coal combustion generates high-temperature flue gas, which is then passed through the annular heat pipe 1.3 to the cogeneration module 2 for power generation. The exhaust gas from the cogeneration module 2 is cooled by the surface cooling module 3 before being discharged.

The temperature difference power generation component of the annular heat pipe module 1 generates electricity by generating a temperature difference.

As an optional embodiment, the temperature difference power generation component of the annular heat pipe module 1 realizes the power generation step by generating a temperature difference. In the in-situ combustion zone of the thin coal seam, a temperature difference is generated on the outside of the annular heat pipe module 1 to form an electromotive force; a temperature difference is generated on the inside of the annular heat pipe module 1 to form an electromotive force.

The bottom end of the outer thermoelectric power generation chip group tube 1.2 of the annular heat pipe module 1 is in direct contact with the combustion zone, and its heat source comes from the combustion zone. The top end of the outer thermoelectric power generation chip group tube 1.2 is a cold source, and its cold source comes from the top of the annular heat pipe 1.3. The heat source of the bottom end of the inner thermoelectric power generation chip group tube 1.2 comes from the high-temperature flue gas in the inner exhaust pipe, and the cold source of the top end of the inner thermoelectric power generation chip group tube 1.2 comes from the top of the annular heat pipe 1.3.

The top of the annular heat pipe 1.3 is cooled by the cooling pipe 1.4.

Compared to traditional technologies, this device and method efficiently transfers heat generated by in-situ combustion of shallow coal layers through annular heat pipes 1.3. This heat is transferred to the thermoelectric chips within the thermoelectric chipset stack 1.2 for electrical energy conversion. Simultaneously, the high-temperature flue gas is reused through the cogeneration module 2, ensuring the efficiency and controllability of the power generation system. The annular heat pipes 1.3 feature a segmented, removable design to accommodate in-situ utilization of thin coal layers at varying depths. The thermoelectric chips generate electricity from the temperature difference between the high temperature in the combustion zone and the cooling water at the condenser end. This energy is used to operate mining equipment or power external devices.

The entire system design takes into account the dynamics of thin-bed coal combustion, changing environmental conditions, and combustion safety. The thermoelectric power generation chip and steam turbine power generation achieve cascade energy utilization, ensuring optimal system performance.

In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims (8)

1. The utility model provides a thin coal in-situ fluidization exploitation device which is characterized by comprising an annular heat pipe module (1), wherein the annular heat pipe module (1) comprises an annular heat pipe (1.3) and a thermoelectric power generation component, the bottom end of the annular heat pipe (1.3) is communicated and arranged in a thin coal layer in-situ combustion zone, the top end of the annular heat pipe (1.3) is positioned on the earth surface, an earth surface cooling module (3) is in heat exchange with the top end of the annular heat pipe (1.3), an exhaust end of the annular heat pipe (1.3) is communicated and arranged with a co-production power generation module (2), the co-production power generation module (2) is in heat exchange with the earth surface cooling module (3), the thin coal layer in-situ combustion zone is communicated with an exhaust end of an in-situ combustion module (4), the in-situ combustion module (4) is arranged on the earth surface, and an air inlet end of the in-situ combustion module (4) is communicated with the atmosphere, and the in-situ combustion module (4) feeds earth surface air into the thin coal layer in-situ combustion zone to heat and then exhaust hot air into the co-production power generation module (2) through the annular heat pipe module (1);

The thermoelectric generation component comprises a thermoelectric generation chipset pipe (1.2) and a cooling pipe (1.4), the thermoelectric generation chipset pipe (1.2) is coaxially sleeved on the inner side of the annular heat pipe (1.3), an exhaust pipe (1.1) is arranged on the inner side of the thermoelectric generation chipset pipe (1.2), the annular heat pipe (1.3) is sleeved on the outer side of one end of the thin coal seam in-situ combustion zone and is fixedly provided with another thermoelectric generation chipset pipe (1.2), and the thermoelectric generation chipset pipe (1.2) and the annular heat pipe (1.3) are in heat exchange arrangement;

The cooling pipe (1.4) is sleeved outside one end of the annular heat pipe (1.3) positioned on the ground surface, and the annular heat pipe (1.3) and the cooling pipe (1.4) are in heat exchange arrangement;

the cooling pipe (1.4) is in heat exchange arrangement with the surface cooling module (3);

ribs are arranged in the exhaust pipe (1.1);

the annular heat pipe (1.3) comprises an annular heat pipe I positioned at the top, an annular heat pipe II positioned at the middle and an annular heat pipe III positioned at the bottom, wherein the annular heat pipe I, the annular heat pipe II and the annular heat pipe III are coaxially fixed;

The annular heat pipe I, the annular heat pipe II and the annular heat pipe III are coaxially fixed with the thermoelectric generation chip set pipe (1.2), and two adjacent thermoelectric generation chip set pipes (1.2) are coaxially fixed;

The cooling pipe (1.4) is sleeved on the outer side of the annular heat pipe I at the top, and the cooling pipe (1.4) and the annular heat pipe I are in heat exchange arrangement;

The other thermoelectric generation chipset tube (1.2) is sleeved and fixed on the outer side of the annular heat pipe positioned at the bottom.

2. The thin-layer coal in-situ fluidization exploitation device according to claim 1, wherein the thermoelectric generation chipset tube (1.2) comprises a pipeline, a plurality of thermoelectric generation chipsets are arranged along the height direction of the pipeline, the thermoelectric generation chipsets comprise a plurality of thermoelectric generation chips, and the thermoelectric generation chips are embedded in the pipeline.

3. The thin-layer coal in-situ fluidization exploitation device according to claim 2 is characterized in that spiral stripes are arranged on one side of the thermoelectric generation chip positioned on the annular heat pipe (1.3), a copper sheet and ribs are connected to one side of the thermoelectric generation chip positioned on the top of the annular heat pipe (1.3), and one side of the thermoelectric generation chip positioned on the top of the annular heat pipe (1.3) is in heat exchange arrangement with the cooling pipe (1.4) through the copper sheet and the ribs;

the cooling pipe (1.4) is arranged in heat exchange with the surface cooling module (3) through a coil pipe I.

4. The thin-layer coal in-situ fluidization exploitation device according to claim 1, wherein the air outlet end of the co-production power generation module (2) is communicated with one end of a second coil pipe, the second coil pipe is in heat exchange arrangement with the surface cooling module (3), and the air outlet end of the second coil pipe is communicated with the atmosphere.

5. A thin-layer coal in-situ fluidization exploitation device as set forth in claim 3, wherein the first coil pipe and the surface cooling module (3) are filled with cooling working medium.

6. The thin coal in-situ fluidization exploitation device as set forth in claim 5, wherein the cooling working medium is water.

7. A method for in-situ fluidization exploitation of thin coal, which uses the in-situ fluidization exploitation device of thin coal as set forth in any one of claims 1-6, and is characterized by comprising the following steps:

introducing air into the selected thin coal seam through the in-situ combustion module (4);

Actively igniting the shallow coal seam to form an in-situ combustion zone of the shallow coal seam;

arranging the bottom end of the annular heat pipe (1.3) of the annular heat pipe module (1) in the thin coal seam in-situ combustion zone, wherein the top end of the annular heat pipe (1.3) is arranged on the ground surface;

Cooling the top end of the annular heat pipe (1.3) through the surface cooling module (3);

The air is heated to form high-temperature flue gas, the high-temperature flue gas is led to the co-production power generation module (2) by the annular heat pipe (1.3) to generate power, and the exhaust gas of the co-production power generation module (2) is cooled by the surface cooling module (3) and then discharged;

The thermoelectric generation component of the annular heat pipe module (1) generates power by generating a temperature difference.

8. The thin-layer coal in-situ fluidization exploitation method according to claim 7 is characterized in that in the step of generating power by generating a temperature difference through the temperature difference power generation part of the annular heat pipe module (1), in an in-situ combustion zone of a thin coal layer, the temperature difference is generated outside the annular heat pipe module (1) to form electromotive force, and the temperature difference is generated inside the annular heat pipe module (1) to form electromotive force.