In-situ sealed sampling refrigeration and water removal device for gas content determination

Abstract

The application relates to an in-situ sealed sampling refrigeration water removal device for gas content determination, belonging to the technical field of gas detection, which comprises a drill rod, a coal sample tank is fixedly arranged at the front end of the drill rod, and a drill bit is fixedly arranged at the front end of the coal sample tank; an outside sampling port is arranged at the front end of the coal sample tank, a sampling baffle is rotationally arranged at the inside of the outside sampling port; a plurality of cylindrical refrigeration fins are fixedly arranged in the coal sample tank, and a water outlet is arranged at the rear end of the coal sample tank; an installation groove is arranged at the inside of the front end of the drill rod, a battery is arranged in the installation groove, and the battery is electrically connected with the refrigeration fins; the problems that the coal sample needs to be taken out after drilling and sent to a laboratory, thereby causing deviation of the determination result, are solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas detection, and particularly relates to an in-situ sealed sampling refrigeration water removal device for gas content determination. BACKGROUND

[0002] In the coal mine gas disaster prevention work, accurate determination of the gas content of the coal sample is crucial. The determination result is not only an important basis for evaluating the gas emission amount of the mine and predicting the risk of gas explosion, but also a key to formulating gas control measures and ensuring the safety of miners.

[0003] In the gas content determination process, in addition to the determination of the gas adsorption amount of the coal sample, the ash content, moisture content and volatile content of the coal sample must also be determined at the same time. The accuracy of these three indicators directly affects the calculation and evaluation results of the gas content. The influence of the moisture content on the determination result is particularly significant. Coal is a porous structure material with strong water absorption. In the actual underground sampling process, in order to ensure the drilling efficiency and reduce dust pollution, the water drilling process is usually used. However, a large amount of water inevitably comes into contact with the coal sample during the water drilling process, resulting in water absorption of the coal sample and significant increase of the moisture content. The increase of the moisture content will dilute the volatile content in the coal sample, and the drying treatment needs to be carried out in the laboratory. In the transportation process, the coal sample will be affected by the gas in the air, which will interfere with the determination result, thereby causing deviation of the gas content determination result and affecting the accurate evaluation of the gas condition of the mine. Therefore, it is necessary to strictly control the change of the moisture content of the coal sample in the sampling, transportation and determination processes, ensure that the coal sample remains in a dry state, and minimize the interference of external moisture, so as to restore the true condition of the coal sample. This requires us to take effective measures at the sampling link to avoid the contact of the coal sample with water or to carry out drying treatment as soon as possible after sampling, so as to provide a reliable sample basis for subsequent gas content determination. SUMMARY

[0004] The application overcomes the shortcomings of the prior art and provides an in-situ sealed sampling refrigeration water removal device for gas content determination, which solves the problem of deviation of the determination result caused by the need to take out the coal sample after drilling and send it to the laboratory.

[0005] In order to achieve the above purpose, the application is implemented by the following technical scheme.

[0006] The in-situ sealed sampling refrigeration water removal device for gas content determination comprises a drill rod, a coal sample tank is fixedly arranged at the front end of the drill rod, and a drill bit is fixedly arranged at the front end of the coal sample tank; an outer sampling port is arranged at the front end of the coal sample tank, and a sampling baffle is rotatably arranged inside the outer sampling port; a cylindrical refrigeration fin is fixedly arranged inside the coal sample tank, and a water outlet is arranged at the rear end of the coal sample tank; an installation groove is arranged inside the front end of the drill rod, a battery is arranged inside the installation groove, and the battery is electrically connected with the refrigeration fin.

[0007] Further, the coal sample tank is a cylindrical structure, the front end of the coal sample tank is a flat structure, the rear end of the coal sample tank is a conical structure that protrudes outward, and the water outlet is arranged at the tip of the conical structure; the conical structure at the rear end of the coal sample tank is arranged inside the mounting groove at the front end of the drill rod.

[0008] Further, a motor is fixedly arranged at the front end inside the coal sample tank, the sampling baffle is fixedly arranged on the output shaft of the motor, the sampling baffle is attached to the front inner wall of the coal sample tank, and an inner sampling port is arranged on the sampling baffle.

[0009] Further, a support frame is fixedly arranged at the front end inside the coal sample tank, the two ends of the support frame are fixedly connected to the two inner walls of the coal sample tank, and the motor is fixedly arranged at the center of the support frame.

[0010] Further, when the inner sampling port on the sampling baffle coincides with the outer sampling port at the front end of the coal sample tank, the front end of the coal sample tank is in an open state; when the inner sampling port on the sampling baffle is misaligned with the outer sampling port at the front end of the coal sample tank, the front end of the coal sample tank is in a closed state.

[0011] Further, the refrigeration sheet comprises a heat sink, an outer insulating layer, an outer conductor, a P-type semiconductor, an N-type semiconductor, an inner insulating layer, and an inner conductor; the heat sink, the outer insulating layer, and the inner insulating layer are all circular cylindrical structures with open ends, the heat sink is fixedly arranged outside the outer insulating layer, and the inner insulating layer is arranged inside the outer insulating layer; a circle of P-type semiconductors and N-type semiconductors arranged in a circular array is arranged between the inner insulating layer and the outer insulating layer, the number of P-type semiconductors is equal to the number of N-type semiconductors, and the P-type semiconductors and the N-type semiconductors are arranged in pairs with a spacing therebetween; a circle of outer conductors arranged in a circular array is arranged between the P-type semiconductors and the N-type semiconductors and the outer insulating layer, and the circle of outer conductors is fixedly arranged on the inner side of the outer insulating layer; a circle of inner conductors arranged in a circular array is arranged between the P-type semiconductors and the N-type semiconductors and the inner insulating layer, and the circle of inner conductors is fixedly arranged on the outer side of the inner insulating layer.

[0012] Further, the number of inner conductors is equal to the number of P-type semiconductors and N-type semiconductors, each inner conductor is connected to two adjacent P-type semiconductors and N-type semiconductors, and the number of outer conductors is one more than the number of P-type semiconductors and N-type semiconductors, wherein the two outer conductors at the ends are respectively connected to two adjacent P-type semiconductors and N-type semiconductors at the ends, and all outer conductors in the middle are respectively connected to two adjacent P-type semiconductors and N-type semiconductors in the middle.

[0013] Further, the outer side end of the P-type semiconductor in the middle is connected with the outer side end of the N-type semiconductor on one side through an outer side conductor, and the inner side end of the P-type semiconductor in the middle is connected with the inner side end of the N-type semiconductor on the other side through an inner side conductor.

[0014] Further, the two outer side conductors at the end are connected with the positive and negative poles of the battery respectively.

[0015] Further, the plurality of refrigeration fins are fixedly connected with the inner wall of the coal sample tank through the fixing frame.

[0016] The present application has the following beneficial effects compared with the prior art:

[0017] (1) The present application integrates the drying function in the sampling device. After the coal sample collection is completed, in-situ drying treatment is directly carried out in the borehole, avoiding the lengthy process of taking out and transporting the coal sample to the laboratory. The whole cycle from sampling to obtaining experimental results is greatly shortened, the work efficiency is improved, and the sampling cost is reduced. Moreover, the present application has automatic control function, reduces human intervention, and simplifies the operation process.

[0018] (2) The present application adopts integrated design, eliminates the opportunity of the coal sample contacting with air before drying, reduces the pollution of impurities in the air to the coal sample, so that the gas content determination result has more reference value, improves the evaluation precision of gas emission amount, extraction effect and other indexes, and is more beneficial to guide the implementation of gas control engineering. In addition, through the more efficient drying process, energy consumption and laboratory operation cost are also reduced, and the repeated experiment cost caused by incomplete drying is also reduced.

[0019] (3) The present application has in-situ drying capacity, which makes the device not only suitable for conventional coal seams, but also can provide more reliable determination results for coal seams with higher water content or prone to oxidative metamorphism. Its applicability is wider, and can meet the gas management needs of more coal mines. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described in detail below with reference to the accompanying drawings:

[0021] Figure 1 is a structural schematic diagram of the whole present application;

[0022] Figure 2 is a sectional view of the present application;

[0023] Figure 3 is a connection schematic diagram of the coal sample tank and the drill bit;

[0024] Figure 4 is a connection schematic diagram of the drill bit and the half-sectioned coal sample tank;

[0025] Figure 5 is a structural schematic diagram of the coal sample tank;

[0026] Figure 6 is a schematic diagram of the connection between the motor and the sampling baffle;

[0027] Figure 7 is a structural schematic diagram of the refrigeration sheet;

[0028] Figure 8 is a working schematic diagram of the refrigeration sheet;

[0029] Wherein, 1 is a drill rod, 2 is a coal sample tank, 3 is a drill bit, 4 is an outer sampling port, 5 is a sampling baffle, 6 is a refrigeration sheet, 7 is a water outlet, 8 is a mounting groove, 9 is a battery, 10 is a support frame, 11 is a motor, 12 is an inner sampling port, 13 is a cooling fin, 14 is an outer insulating layer, 15 is an outer conductor, 16 is a P-type semiconductor, 17 is an N-type semiconductor, 18 is an inner insulating layer, 19 is an inner conductor, 20 is a fixing frame, and 21 is a water storage tank. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail in conjunction with the embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. The technical solutions of the present application are described in detail below in conjunction with the embodiments and drawings, but the protection scope is not limited thereto.

[0031] As shown in Figure 1 8, the present application provides an in-situ sealed sampling refrigeration and water removal device for gas content determination, which comprises a drill rod 1, a coal sample tank 2 fixedly arranged at the front end of the drill rod 1, and a drill bit 3 fixedly arranged at the front end of the coal sample tank 2; an outer sampling port 4 is arranged at the front end of the coal sample tank 2, and a sampling baffle 5 is rotatably arranged inside the outer sampling port 4; a cylindrical refrigeration sheet 6 is fixedly arranged inside the coal sample tank 2, and a water outlet 7 is arranged at the rear end of the coal sample tank 2; a mounting groove 8 is arranged inside the front end of the drill rod 1, a battery 9 is arranged inside the mounting groove 8, and the battery 9 is electrically connected with the refrigeration sheet 6.

[0032] The coal sample tank 2 is in a cylindrical structure, the front end of the coal sample tank 2 is in a planar structure, the rear end of the coal sample tank 2 is in a conical structure protruding outward, and the water outlet 7 is arranged at the tip of the conical structure. The conical structure at the rear end of the coal sample tank 2 is arranged inside the mounting groove 8 at the front end of the drill rod 1. A water storage tank 21 is also fixedly arranged inside the mounting groove 8, the water outlet 7 is connected with the inlet of the water storage tank 21 through a water conveying pipeline, and the condensed liquid water in the coal sample tank 2 flows into the water storage tank 21 through the water outlet 7 and the water conveying pipeline for collection. A one-way valve is also arranged on the water conveying pipeline to prevent the water in the water storage tank 21 from flowing back to the coal sample tank 2.

[0033] A support frame 10 is fixedly arranged inside the front end of the coal sample tank 2, both ends of the support frame 10 are fixedly connected with the inner walls of both sides of the coal sample tank 2, a motor 11 is fixedly arranged at the center of the support frame 10, and the output shaft of the motor 11 faces the front side. The sampling baffle 5 is fixedly arranged on the output shaft of the motor 11, and the rotation of the sampling baffle 5 is controlled by the motor 11. The sampling baffle 5 is a circular plate structure, and the sampling baffle 5 is attached to the front inner wall of the coal sample tank 2. An inner sampling port 12 is arranged on the sampling baffle 5. The motor 11 is electrically connected with the battery 9.

[0034] When the inner sampling port 12 on the sampling baffle 5 coincides with the outer sampling port 4 at the front end of the coal sample tank 2, the front end of the coal sample tank 2 is in an open state, and the coal sample and the gas can enter the inside of the coal sample tank 2 through the outer sampling port 4 and the inner sampling port 12; when the inner sampling port 12 on the sampling baffle 5 is dislocated from the outer sampling port 4 at the front end of the coal sample tank 2, the front end of the coal sample tank 2 is in a closed state, and the coal sample tank 2 is closed at this time.

[0035] The refrigeration sheet 6 includes a heat dissipation fin 13, an outer insulating layer 14, an outer conductor 15, a P-type semiconductor 16, an N-type semiconductor 17, an inner insulating layer 18, and an inner conductor 19.

[0036] The heat dissipation fin 13, the outer insulating layer 14, and the inner insulating layer 18 are all circular cylindrical structures with both ends open, wherein the heat dissipation fin 13 is fixedly arranged on the outside of the outer insulating layer 14, and the inner insulating layer 18 is arranged on the inside of the outer insulating layer 14. A circle of P-type semiconductors 16 and N-type semiconductors 17 arranged in a circular array are arranged between the inner insulating layer 18 and the outer insulating layer 14, wherein the number of P-type semiconductors 16 and N-type semiconductors 17 is equal and arranged one by one.

[0037] A circle of outer conductors 15 arranged in a circular array are arranged between the P-type semiconductors 16 and the N-type semiconductors 17 and the outer insulating layer 14, and a circle of outer conductors 15 are fixedly arranged on the inner side of the outer insulating layer 14.

[0038] A circle of inner conductors 19 arranged in a circular array are arranged between the P-type semiconductors 16 and the N-type semiconductors 17 and the inner insulating layer 18, and a circle of inner conductors 19 are fixedly arranged on the outer side of the inner insulating layer 18.

[0039] The number of inner conductors 19 is equal to the number of P-type semiconductors 16 and N-type semiconductors 17, and each inner conductor 19 is connected with two adjacent P-type semiconductors 16 and N-type semiconductors 17.

[0040] The number of the outer conductors 15 is one more than the number of the P-type semiconductors 16 and the N-type semiconductors 17, wherein two outer conductors 15 at the end are connected with two adjacent P-type semiconductors 16 and N-type semiconductors 17 at the end respectively, and all outer conductors 15 at the middle are connected with two adjacent P-type semiconductors 16 and N-type semiconductors 17 at the middle respectively. The two outer conductors 15 at the end are connected with the positive and negative poles of the battery 9 respectively.

[0041] The outer side of the P-type semiconductor 16 at the middle is connected with the outer side of the N-type semiconductor 17 at one side through an outer conductor 15, and the inner side of the P-type semiconductor 16 at the middle is connected with the inner side of the N-type semiconductor 17 at the other side through an inner conductor 19.

[0042] The outer side of the outer heat sink 13 is in a sawtooth structure, so as to increase the heat dissipation area of the outer heat sink 13.

[0043] The plurality of refrigeration fins 6 are fixedly connected with the inner wall of the coal sample tank 2 through the fixing frame 20, so as to be fixedly arranged in the middle of the inner side of the coal sample tank 2.

[0044] The refrigeration fin 6 utilizes the Peltier effect, and realizes cold and heat separation by using the "heat transfer" when the current passes through the P-type semiconductor 16 and the N-type semiconductor 17. The current flows from the positive pole of the power supply to the outer conductor 15, to the N-type semiconductor 17, to the inner conductor 19, to the P-type semiconductor 16, to the outer conductor 15, and back to the negative pole of the power supply, and two adjacent P-type semiconductors 16 and N-type semiconductors 17 form a series thermocouple pair. In the P-type semiconductor 16 and the N-type semiconductor 17, the current in the P-type semiconductor 16 moves from the low potential end (the inner conductor 19) to the high potential end (the outer conductor 15), and the current in the N-type semiconductor 17 moves from the high potential end (the outer conductor 15) to the low potential end (the inner conductor 19) by electrons. When the current flows from the P-type semiconductor 16 to the N-type semiconductor 17, the electrons jump from the low energy level to the high energy level and release energy, which is manifested as heat release, so that one end of the outer insulating layer 14 is a hot end. When the current flows from the N-type semiconductor to the P-type semiconductor, the electrons jump from the high energy level to the low energy level and absorb energy, which is manifested as heat absorption, so that one end of the inner insulating layer 18 is a cold end.

[0045] Each group of P-type semiconductors 16 and N-type semiconductors 17 independently generates "cold end heat absorption and hot end heat release", but due to the array design, the heat absorption / heat release of all P-type semiconductors 16 and N-type semiconductors 17 is superimposed, which strengthens the overall refrigeration / heating effect.

[0046] The working principle of the present application is as follows:

[0047] Step one, control the drilling machine to work, drive the drill bit 3 to drill into the coal seam according to the predetermined parameters. A predetermined drilling time h1 is set, when the drilling time reaches the preset value h1, it indicates that the drill bit 3 has reached the target sampling depth at this time. Then start the motor 11, drive the sampling baffle 5 to rotate through the motor 11, so that the inner sampling port 12 on the sampling baffle 5 coincides with the outer sampling port 4 at the front end of the coal sample tank 2, at this time the front end of the coal sample tank 2 is in an open state.

[0048] Step two, after the front end of the coal sample tank 2 is opened, the coal sample generated during drilling will enter the inside of the coal sample tank 2, collecting gas from a specific coal seam depth. After a collection time of h2, control the motor 11 to rotate in the opposite direction, so that the inner sampling port 12 on the sampling baffle 5 is dislocated with the outer sampling port 4 at the front end of the coal sample tank 2, at this time the front end of the coal sample tank 2 is in a closed state, the collected gas is sealed inside the coal sample tank 2, ensuring the authenticity of the gas composition.

[0049] Step three, after the coal sample and gas collection is completed, the refrigeration sheet 6 starts to work. The battery 9 provides power for the refrigeration sheet 6, at this time the inside of the refrigeration sheet 6 is the cold end and the outside of the refrigeration sheet 6 is the hot end, the cold end absorbs heat and the hot end releases heat, so the outside of the refrigeration sheet 6 releases heat and the inside of the refrigeration sheet 6 absorbs heat. Because the wet coal sample is located on the outside of the refrigeration sheet 6, the heat released by the outside of the refrigeration sheet 6 increases the temperature of the space on the outside of the refrigeration sheet 6, thereby gradually evaporating the moisture in the wet coal sample into water vapor, which disperses inside the coal sample tank 2. Because the inside of the refrigeration sheet 6 absorbs heat, the temperature inside the refrigeration sheet 6 decreases, and the gas pressure in the space inside the refrigeration sheet 6 also decreases. The gas pressure on the outside of the refrigeration sheet 6 is higher than that on the inside of the refrigeration sheet 6, so the gas and water vapor inside the coal sample tank 2 flows into the inside of the refrigeration sheet 6 under the action of the pressure difference. Because the temperature inside the refrigeration sheet 6 is lower, the water vapor entering the inside of the refrigeration sheet 6 condenses into liquid water and adheres to the inside of the refrigeration sheet 6. As the amount of liquid water adhering increases, eventually the liquid water flows into the conical structure at the rear end of the coal sample tank 2 and flows into the water storage tank 21 through the water outlet 7 and the water delivery pipeline for collection.

[0050] Step four, as the refrigeration sheet 6 continues to work, the moisture in the coal sample will first undergo the process of evaporation and then condensation, and eventually be discharged outward from the water outlet 7, thereby avoiding the accumulation of moisture inside the coal sample tank 2.

[0051] Step five, after a period of condensation and drainage process, the moisture contained in the coal sample inside the coal sample tank 2 is effectively removed, thereby obtaining dry coal samples. The dried coal sample can be used for subsequent gas content determination or other experiments inside the borehole.

[0052] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. An in-situ sealed sampling refrigeration water removal device for gas content determination, characterized in that: The utility model provides a coal sample drill rod, which comprises a drill rod (1), a coal sample tank (2) fixedly arranged at the front end of the drill rod (1), and a drill bit (3) fixedly arranged at the front end of the coal sample tank (2); an outer sampling port (4) is arranged at the front end of the coal sample tank (2), and a sampling baffle (5) is rotatably arranged inside the outer sampling port (4); a cylindrical refrigeration sheet (6) is fixedly arranged inside the coal sample tank (2), and a water outlet (7) is arranged at the rear end of the coal sample tank (2); a mounting groove (8) is arranged inside the front end of the drill rod (1), a battery (9) is arranged inside the mounting groove (8), and the battery (9) is electrically connected with the refrigeration sheet (6). The refrigeration sheet (6) comprises fins (13), an outer insulating layer (14), an outer conductor (15), a P-type semiconductor (16), an N-type semiconductor (17), an inner insulating layer (18), and an inner conductor (19); the fins (13), the outer insulating layer (14), and the inner insulating layer (18) are all circular cylindrical structures with both ends being open, wherein the fins (13) are fixedly arranged outside the outer insulating layer (14), and the inner insulating layer (18) is arranged inside the outer insulating layer (14); the inner side of the refrigeration sheet (6) is a cold end, and the outer side of the refrigeration sheet (6) is a hot end; the coal sample generated during drilling enters the inside of the coal sample tank (2) and is located outside the refrigeration sheet (6).

2. An in-situ sealed sampling, refrigeration and water removal device for gas content determination according to claim 1, characterized in that: The coal sample tank (2) is a cylindrical structure, the front end of the coal sample tank (2) is a planar structure, the rear end of the coal sample tank (2) is a conical structure that protrudes outward, and the water outlet (7) is arranged at the tip of the conical structure; the conical structure at the rear end of the coal sample tank (2) is arranged inside the mounting groove (8) at the front end of the drill rod (1).

3. An in-situ sealed sampling, refrigerating and water-removing device for gas content measurement according to claim 1, characterized in that: A motor (11) is fixedly arranged at the front end inside the coal sample tank (2), the sampling baffle (5) is fixedly arranged on the output shaft of the motor (11), the sampling baffle (5) is attached to the inner wall on the front side of the coal sample tank (2), and an inner sampling port (12) is arranged on the sampling baffle (5).

4. An in-situ sealed sampling, refrigerating and water-removing device for gas content measurement according to claim 3, characterized in that: A support frame (10) is fixedly arranged at the front end inside the coal sample tank (2), both ends of the support frame (10) are fixedly connected to the inner walls on both sides of the coal sample tank (2), and the motor (11) is fixedly arranged at the center of the support frame (10).

5. An in-situ sealed sampling, refrigerating and water-removing device for gas content measurement according to claim 3, characterized in that: When the inner sampling port (12) on the sampling baffle (5) coincides with the outer sampling port (4) at the front end of the coal sample tank (2), the front end of the coal sample tank (2) is in an open state; when the inner sampling port (12) on the sampling baffle (5) is dislocated from the outer sampling port (4) at the front end of the coal sample tank (2), the front end of the coal sample tank (2) is in a closed state.

6. An in-situ sealed sampling, refrigerating and water-removing device for gas content measurement according to claim 1, characterized in that: A circle of P-type semiconductor (16) and N-type semiconductor (17) arranged in circular array is arranged between the inner insulating layer (18) and the outer insulating layer (14), wherein the P-type semiconductor (16) and the N-type semiconductor (17) are equal in number and are arranged one by one; a circle of outer conductors (15) arranged in circular array is arranged between the P-type semiconductor (16) and the N-type semiconductor (17) and the outer insulating layer (14), and the circle of outer conductors (15) is fixedly arranged on the inner side of the outer insulating layer (14); a circle of inner conductors (19) arranged in circular array is arranged between the P-type semiconductor (16) and the N-type semiconductor (17) and the inner insulating layer (18), and the circle of inner conductors (19) is fixedly arranged on the outer side of the inner insulating layer (18).

7. An in-situ sealed sampling refrigeration water-removal device for gas content determination according to claim 6, characterized in that: The number of inner conductors (19) is equal to the number of P-type semiconductors (16) and N-type semiconductors (17), each inner conductor (19) is connected to two adjacent P-type semiconductors (16) and N-type semiconductors (17); the number of outer conductors (15) is one more than the number of P-type semiconductors (16) and N-type semiconductors (17), wherein the two outer conductors (15) at the ends are respectively connected to the two adjacent P-type semiconductors (16) and N-type semiconductors (17) at the ends, and all the outer conductors (15) in the middle are respectively connected to the two adjacent P-type semiconductors (16) and N-type semiconductors (17) in the middle.

8. An in-situ sealed sampling refrigeration water-removal device for gas content determination according to claim 7, characterized in that: The outer side of the P-type semiconductor (16) in the middle is connected to the outer side of the N-type semiconductor (17) on one side through an outer conductor (15), and the inner side of the P-type semiconductor (16) in the middle is connected to the inner side of the N-type semiconductor (17) on the other side through an inner conductor (19).

9. An in-situ sealed sampling refrigeration water-removal device for gas content determination according to claim 7, characterized in that: The two outer conductors (15) at the ends are respectively connected to the positive and negative electrodes of the battery (9).

10. An in-situ sealed sampling refrigeration water-removal device for gas content determination according to claim 1, characterized in that: A plurality of refrigeration fins (6) are fixedly connected to the inner wall of the coal sample tank (2) through a fixing frame (20).

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