Underground coal gasification monitoring system

Abstract

The invention discloses a coal underground gasification monitoring system, and relates to the technical field of coal underground gasification, the coal underground gasification monitoring system comprises: a protection pipe arranged in a gas outlet pipe; the plurality of winding assemblies are distributed at intervals in the circumferential direction, are located at the upper end opening of the protection pipe and are used for winding and unwinding the cable; the plurality of temperature measuring assemblies are distributed at intervals in the circumference, are located in the protection tube, and are correspondingly and electrically connected to one end, far away from the winding assembly, of the cable; wherein the protection pipe is connected with a plurality of communicating pipes corresponding to the cables; wherein the protection tube is made of a heat conduction material; when the temperature measuring assemblies are used for monitoring the temperature of gas in the gas outlet pipe, through cooperation of the multiple winding assemblies, only one temperature measuring assembly is located at the inner bottom of the protection pipe, the other temperature measuring assemblies are close to the corresponding communicating pipes, and the communicating pipes provide cooling treatment for the corresponding temperature measuring assemblies.

Description

Technical Field

[0001] The present invention relates to the technical field of underground coal gasification, in particular to an underground coal gasification monitoring system. Background Art

[0002] Underground coal gasification (UCG) technology, an innovative energy development method, focuses on converting deep-lying coal resources directly into gas. This process is achieved through precisely controlled underground combustion, where the coal undergoes a series of thermochemical reactions, transforming it into gas. This gas is then extracted to the surface through specially designed boreholes to meet the energy needs of various users. However, behind this technology's efficient operation lies a major challenge for the monitoring system: ensuring the stability and durability of the monitoring equipment in extremely high-temperature environments.

[0003] Due to the high temperatures inside the furnace, existing temperature measurement devices often cannot withstand prolonged high-temperature corrosion and damage. This directly leads to the failure of the temperature measurement components, which in turn makes the temperature measurement data unstable and inaccurate. This data uncertainty not only weakens the ability to monitor the gasification process in real time, but also may cause production safety accidents due to misjudgment or delayed response, posing a serious threat to personnel safety and equipment integrity.

[0004] Therefore, current monitoring systems mostly measure temperature at the outlet of the gas pipe, failing to penetrate deep into the pipe to measure temperature at critical locations. This limited monitoring approach undoubtedly limits the comprehensiveness and accuracy of data, making it difficult for decision makers to obtain comprehensive information reflecting the true state of the gasification process.

[0005] Therefore, it is necessary to provide an underground coal gasification monitoring system to solve the above problems. Summary of the Invention

[0006] To solve the above problems, the present invention provides the following technical solution: an underground coal gasification monitoring system for monitoring the temperature of gas in a gas outlet pipe, comprising:

[0007] a protective tube, which is built into the air outlet pipe;

[0008] A plurality of reeling assemblies spaced apart circumferentially and located at the upper end of the protective tube for retracting and releasing the cable;

[0009] a plurality of circumferentially spaced temperature measuring components, located inside the protective tube and electrically connected to an end of the cable away from the reeling component;

[0010] Wherein, the protection tube is connected to a plurality of connecting tubes corresponding to the cables;

[0011] Wherein, the protective tube is made of heat-conducting material;

[0012] When the temperature of the gas in the outlet pipe is monitored by using the temperature measuring component, through the cooperation of multiple winding components, only one temperature measuring component is located at the inner bottom of the protective tube, and the other temperature measuring components are close to the corresponding connecting pipes, and the connecting pipes provide cooling treatment for the corresponding temperature measuring components.

[0013] Furthermore, preferably, the temperature measurement component includes:

[0014] Upper cover body;

[0015] A lower cone is connected to the lower side of the upper cover, and a sealed space is formed between the lower cone and the upper cover;

[0016] A plurality of support wheels distributed at circumferential intervals, which are rotatably arranged in the upper cover or the lower cone, and a second torsion spring is provided between the support wheels and the upper cover or the lower cone;

[0017] A heat-isolating plate, which is supported by a plurality of the support wheels, and the heat-isolating plate and the support wheels are engaged with each other;

[0018] A thermometer is built into the insulation tray, and an insulation filler is filled between the thermometer and the insulation tray;

[0019] An accommodating groove is connected to the top of the upper cover body and is used to accommodate an elastic cable, one end of the elastic cable is connected to the cable, and the other end is connected to the thermometer.

[0020] Furthermore, as a preference, before using the temperature measuring component to measure the temperature, the temperature measuring component is placed in a heating device, and the standard temperature rise curve of the temperature measuring component from the initial temperature to the stable temperature is recorded at different temperatures; when using the temperature measuring component to measure the temperature, the actual temperature rise curve of the temperature measuring component from the initial temperature to the stable temperature is recorded, and a standard temperature rise curve similar to the actual temperature rise curve is found to obtain the actual temperature.

[0021] Furthermore, as a preference, a nozzle is further provided in the upper cover body, the nozzle is communicated with a connector located outside the upper cover body, and the connector can be communicated with a corresponding connecting pipe.

[0022] Furthermore, preferably, the winding assembly includes:

[0023] a ratchet, which is fixedly arranged on one side of the protective tube;

[0024] a winding wheel rotatably sleeved on the outside of the ratchet wheel;

[0025] A plurality of pawls distributed in a circumferential array, the pawls being hinged to the inner wall of the winding wheel, a first torsion spring being provided between the pawls and the winding wheel, and a magnetic block being embedded in the side wall of the pawls;

[0026] A plurality of electromagnetic blocks corresponding to the magnetic blocks are embedded in the inner wall of the winding wheel.

[0027] Furthermore, as a preference, a track assembly is sleeved on the outer portion of the upper end of the protection tube, the track assembly comprising an upper gear ring and a lower gear ring, the upper gear ring and the lower gear ring being connected by a rod;

[0028] The track assembly is movably provided with a moving assembly, and the moving assembly includes:

[0029] a frame on which a plurality of outer wheels and a plurality of inner gears are rotatably mounted, wherein the outer wheels contact the outer wall of the upper gear ring or the outer wall of the lower gear ring, and the inner gears mesh with the teeth of the upper gear ring or the teeth of the lower gear ring;

[0030] A synchronizing shaft connected between two internal gears in the same vertical direction;

[0031] A motor, used for driving the synchronous shaft to rotate;

[0032] A driving wheel is fixed on the frame.

[0033] Furthermore, preferably, a composite tube is fixed to one side of the frame, one end of the composite tube can be connected to the connecting tube, and the other end of the composite tube is sucked by a suction device or supplied with liquid by a liquid supply device.

[0034] Furthermore, preferably, the inner wall of the protection tube is provided with a plurality of guide rail grooves distributed at circumferential intervals, and the external fixing sleeve of the cable is provided with a slider, and the slider is slidably arranged in the guide rail groove.

[0035] Furthermore, preferably, the inner bottom of the protection tube is filled with a thermally conductive filler.

[0036] Compared with the existing technology, the present invention provides an underground coal gasification monitoring system with the following beneficial effects:

[0037] In this invention, the protective tube can be lowered into the outlet pipe after it is constructed. Its position is adjustable, allowing it to reach the bottom of the outlet pipe, allowing the temperature measurement component to obtain more accurate bottom temperature data. This is crucial for monitoring and optimizing the gasifier. Furthermore, the gas in the outlet pipe may contain corrosive components, and the protective tube effectively isolates these gases, protecting the temperature measurement component and cables from damage.

[0038] In this invention, the temperature measurement assembly, housed within the upper cover and lower cone, provides the necessary protection for the thermometer, enabling it to safely and stably penetrate the bottom of the exhaust pipe for temperature measurement. The addition of an insulating plate and insulating filler further enhances the thermometer's ability to operate in high-temperature and corrosive environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the main structure of an underground coal gasification monitoring system;

[0040] Figure 2 for Figure 1 The upper part of the enlarged structural diagram;

[0041] Figure 3 A schematic diagram of the structure of a winding component in an underground coal gasification monitoring system;

[0042] Figure 4 A schematic diagram of the structure of a temperature measurement component in an underground coal gasification monitoring system;

[0043] Figure 5 for Figure 4 AA cross-sectional structural diagram;

[0044] In the figure: 1. Exhaust pipe; 2. Protective tube; 3. Winding assembly; 4. Cable; 5. Slider; 6. Temperature measuring assembly; 7. Track assembly; 8. Moving assembly; 9. Driving wheel; 10. Composite tube; 11. Connecting tube; 12. Thermal conductive filler; 31. Ratchet; 32. Winding wheel; 33. Paw; 34. Magnetic block; 61. Upper cover; 62. Lower cone; 63. Support wheel; 64. Insulation plate; 65. Insulation filler; 66. Thermometer; 67. Receiving groove; 68. Elastic cable; 69. Connector; 610. Nozzle; 71. Upper gear ring; 72. Lower gear ring; 81. Frame; 82. Outer wheel; 83. Internal gear; 84. Synchronous shaft; 85. Motor. DETAILED DESCRIPTION

[0045] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, and this is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0046] Please refer to Figure 1-Figure 5 In an embodiment of the present invention, a monitoring system for underground coal gasification is provided for monitoring the temperature of gas in a gas outlet pipe 1, comprising:

[0047] a protective tube 2, which is built into the air outlet pipe 1, and the bottom of the protective tube 2 is close to the bottom area of ​​the air outlet pipe 1;

[0048] A plurality of circumferentially spaced reeling assemblies 3 are located at the upper end of the protective tube 2 and are used to retract and release the cables 4;

[0049] a plurality of circumferentially spaced temperature measuring components 6, located inside the protective tube 2 and electrically connected to one end of the cable 4 away from the winding component 3;

[0050] The protection tube 2 is connected to a plurality of connecting tubes 11 corresponding to the cables 4;

[0051] Wherein, the protection tube 2 is made of heat-conducting material;

[0052] When the temperature of the gas in the outlet pipe 1 is monitored by using the temperature measuring component 6, through the cooperation of multiple winding components 3, only one temperature measuring component 6 is located at the inner bottom of the protective tube 2, and the other temperature measuring components 6 are close to the corresponding connecting pipes 11, and the connecting pipes 11 provide cooling treatment for the corresponding temperature measuring components 6.

[0053] Before starting temperature measurement, the positions of the temperature measuring components 6 are adjusted using the winding assembly 3 so that only one temperature measuring component 6 is located at the inner bottom of the protective tube 2 to measure the temperature of the gas in the outlet pipe 1. The other temperature measuring components 6 are located near the corresponding connecting pipes 11 and are cooled by the lower temperature gas or liquid introduced through the connecting pipes 11 to maintain a lower operating temperature so that the temperature measuring component 6 at the inner bottom can be replaced for temperature measurement when needed.

[0054] Additionally, the protective tube 2 can be lowered into the outlet pipe 1 after it is constructed. This installation method avoids interference with the temperature measurement system during the construction of the outlet pipe 1 and shortens the overall system installation period. Because the protective tube 2 is installed later, it can be adjusted to the actual size and shape of the outlet pipe 1, ensuring optimal fit and installation results.

[0055] Furthermore, the protective tube 2 is located in the middle of the outlet pipe 1, a position that typically more accurately reflects the overall temperature of the gas within the pipe 1 and avoids the influence of temperature gradients caused by gas flow. The protective tube 2 can penetrate deep into the bottom of the outlet pipe 1, allowing the temperature measurement component 6 to directly measure the gas temperature at the lowest level, which is crucial for understanding the temperature characteristics of the gasifier.

[0056] It is worth mentioning that the gas in the outlet pipe 1 may contain corrosive components. The presence of the protective tube 2 can effectively isolate these corrosive gases and protect the temperature measuring component 6 and the cable 4 from damage.

[0057] In this embodiment, the temperature measuring component 6 includes:

[0058] Upper cover 61;

[0059] A lower cone 62 is connected to the lower side of the upper cover 61, and a sealed space is formed between the lower cone 62 and the upper cover 61;

[0060] A plurality of support wheels 63 are circumferentially spaced and rotatably disposed in the upper cover 61 or the lower cone 62 , and a second torsion spring is disposed between the support wheels 63 and the upper cover 61 or the lower cone 62 ;

[0061] The heat-isolating plate 64 is supported by the plurality of support wheels 63 , and the heat-isolating plate 64 and the support wheels 63 are meshed with each other;

[0062] A thermometer 66 is built into the insulation tray 64 , and an insulation filler 65 is filled between the thermometer 66 and the insulation tray 64 ;

[0063] The accommodating groove 67 is connected to the top of the upper cover 61 and is used to accommodate an elastic cable 68 . One end of the elastic cable 68 is connected to the cable 4 , and the other end is connected to the thermometer 66 .

[0064] Therefore, before using the temperature measuring component 6 to measure the temperature, place the temperature measuring component 6 in a heating device, and record the standard temperature rise curve of the temperature measuring component 6 from the initial temperature to the stable temperature at different temperatures; when using the temperature measuring component 6 to measure the temperature, record the actual temperature rise curve of the temperature measuring component 6 from the initial temperature to the stable temperature, and find a standard temperature rise curve similar to the actual temperature rise curve to obtain the actual temperature.

[0065] Furthermore, the temperature measuring assembly 6, through the housing formed by the upper cover 61 and the lower cone 62, provides necessary protection for the thermometer 66, allowing it to safely and stably penetrate deep into the bottom of the outlet pipe 1 for temperature measurement. The addition of the insulating plate 64 and insulating filler 65 further enhances the thermometer 66's ability to operate in high-temperature and corrosive environments.

[0066] Although this may cause a certain difference between the measured temperature and the actual temperature, further speaking, although the insulation disk 64 and the insulation filler 65 can reduce the direct impact of the external high temperature on the thermometer 66, they will also introduce a certain thermal resistance, causing the temperature measured by the thermometer 66 to deviate from the actual temperature.

[0067] To quantify the above differences, we adopted the following temperature calibration strategy:

[0068] S1. In a laboratory environment, use a known heating device to heat the temperature measurement component 6.

[0069] S2. Record the standard temperature rise curve of the temperature measuring component 6 from the initial temperature to the stable temperature at different set temperatures. Repeat the experiment multiple times at each set temperature to improve the accuracy and reliability of the data.

[0070] S3. During the actual temperature measurement process, the temperature measuring component 6 is placed at a predetermined position on the protection tube 2. The actual temperature rise curve of the temperature measuring component 6 from the initial temperature to the stable temperature is recorded.

[0071] S4. Compare the actual temperature rise curve with the stored standard temperature rise curve. Using an algorithm or manual judgment, find the standard temperature rise curve that is most similar to the actual temperature rise curve. Based on the temperature values ​​corresponding to the similar standard temperature rise curve, calibrate the actual temperature measurement result to obtain a value closer to the actual temperature.

[0072] S5. Regularly calibrate the temperature measuring component 6 to ensure its temperature measurement accuracy. If a large temperature measurement error is found, the temperature measuring component 6 needs to be adjusted or replaced in a timely manner.

[0073] Through the above temperature calibration strategy, we can effectively quantify the temperature measurement error of the temperature measurement component 6 in a high temperature and corrosive environment, and improve the temperature measurement accuracy and reliability of the underground coal gasification monitoring system.

[0074] In this embodiment, a nozzle 610 is further provided in the upper cover body 61 . The nozzle 610 is communicated with a connector 69 located outside the upper cover body 61 . The connector 69 can be communicated with a corresponding connecting pipe 11 .

[0075] The nozzle 610 is not only connected to the connector 69 located outside the upper cover 61, but can also be connected to the external connecting pipe 11 through the connector 69. In this way, liquid, such as cooling water or other suitable cooling medium, can be introduced into the temperature measuring component 6 from the outside.

[0076] Furthermore, the liquid sprayed from nozzle 610 not only has a cooling effect but also generates a certain impact force. This impact force is cleverly utilized to drive the rotation of insulating disk 64. As a result, the cooling medium can quickly remove heat from the temperature measuring component, lowering its operating temperature, thereby extending the service life of thermometer 66 and improving temperature measurement accuracy. Furthermore, the rotation of the insulating disk ensures a more uniform cooling effect, avoiding temperature measurement errors caused by localized overheating.

[0077] In this embodiment, the winding assembly 3 includes:

[0078] a ratchet 31 fixedly disposed on one side of the protection tube 2;

[0079] a winding wheel 32 rotatably sleeved on the outside of the ratchet wheel 31;

[0080] A plurality of pawls 33 distributed in a circumferential array, the pawls 33 are hinged to the inner wall of the winding wheel 32, a first torsion spring is provided between the pawls and the winding wheel 32, and a magnetic block 34 is embedded in the side wall of the pawls 33;

[0081] A plurality of electromagnetic blocks corresponding to the magnetic blocks 34 are embedded in the inner wall of the winding wheel 32 .

[0082] Then, when the reel 32 rotates and reels the cable 4, the ratchet 31 and the pawl 33 cooperate to limit the reel 33 so that it can only rotate in a certain direction, such as counterclockwise. When the reel 32 is used to release the cable 4, the electromagnetic block is energized, thereby attracting the magnetic block 34, so that the pawl 33 deflects, thereby releasing the restriction between the pawl 33 and the ratchet 31.

[0083] In this embodiment, a track assembly 7 is sleeved on the outer portion of the upper end of the protection tube 2. The track assembly 7 includes an upper gear ring 71 and a lower gear ring 72. The upper gear ring 71 and the lower gear ring 72 are connected by a rod.

[0084] The track assembly 7 is movably provided with a moving assembly 8, and the moving assembly 8 includes:

[0085] A frame 81 on which a plurality of outer wheels 82 and a plurality of inner gears 83 are rotatably mounted, wherein the outer wheels 82 contact the outer wall of the upper gear ring 71 or the outer wall of the lower gear ring 72, and the inner gears 83 mesh with the teeth of the upper gear ring 71 or the teeth of the lower gear ring 72;

[0086] A synchronization shaft 84 connected between the two internal gears 83 in the same vertical direction;

[0087] The motor 85 is used to drive the synchronization shaft 84 to rotate;

[0088] The driving wheel 9 is fixed on the frame 81 .

[0089] Then, the driving wheel 9 can be sent to the specified position by the moving component 8, so that the driving wheel 9 can drive the winding wheel 32 to rotate and then reel in the cable 4. At the same time, the composite pipe 10 can also be moved to the specified position to dock with the connecting pipe 11.

[0090] In this embodiment, a composite tube 10 is fixed to one side of the frame 81 , one end of the composite tube 10 can be connected to the connecting tube 11 , and the other end of the composite tube 10 is pumped with air by a suction device or supplied with liquid by a liquid supply device.

[0091] Specifically, the liquid supply device can supply carbon dioxide liquid, and after the carbon dioxide liquid is sprayed onto the insulation plate, the carbon dioxide liquid turns into gas. After a period of time, the composite tube 10 can be switched to the suction device, and the carbon dioxide gas can be extracted by the suction device.

[0092] Furthermore, a tee is provided at one end of the composite pipe 10, and the tee is connected to the suction device and the liquid supply device respectively, so as to improve the efficiency and convenience of the device switching.

[0093] As a preferred embodiment, the inner wall of the protective tube 2 is provided with a plurality of guide rail grooves distributed at circumferential intervals, and the external fixed sleeve of the cable 4 is provided with a slider 5, and the slider 5 is slidably arranged in the guide rail groove, thereby improving the stability of the movement of the slider 5 and the temperature measuring component 6.

[0094] As a preferred embodiment, the inner bottom of the protection tube 2 is filled with a heat-conducting filler 12 , which helps to conduct heat on the one hand and stabilize the temperature measuring component 6 on the other hand.

[0095] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An underground coal gasification monitoring system for monitoring the temperature of gas in a gas outlet pipe (1), characterized in that: include: A protective tube (2) built into the air outlet pipe (1); a plurality of reeling assemblies (3) evenly distributed along the circumference of the protective tube (2), located at the upper end of the protective tube (2) and used for retracting and releasing the cable (4); a plurality of temperature measuring components (6) uniformly distributed along the circumference of the protective tube (2), located inside the protective tube (2) and electrically connected to one end of the cable (4) away from the winding component (3); Wherein, the protection tube (2) is connected to a plurality of connecting tubes (11) corresponding to the cables (4); Wherein, the protective tube (2) is made of heat-conducting material; When the temperature of the gas in the outlet pipe (1) is monitored by using the temperature measuring component (6), through the cooperation of multiple winding components (3), only one temperature measuring component (6) is located at the inner bottom of the protection tube (2), and the other temperature measuring components (6) are close to the corresponding connecting pipes (11), and the connecting pipes (11) provide cooling treatment for the corresponding temperature measuring components (6).

2. The underground coal gasification monitoring system according to claim 1, characterized in that: The temperature measuring component (6) comprises: Upper cover (61); A lower cone (62) is connected to the lower side of the upper cover (61), and a sealed space can be formed between the lower cone (62) and the upper cover (61); A plurality of support wheels (63) are circumferentially spaced and rotatably disposed in the upper cover (61) or the lower cone (62), and a second torsion spring is disposed between the support wheel (63) and the upper cover (61) or the lower cone (62); A heat-isolating plate (64) is supported by a plurality of the supporting wheels (63), and the heat-isolating plate (64) and the supporting wheels (63) are engaged with each other; A thermometer (66) is built into the insulation tray (64), and an insulation filler (65) is filled between the thermometer (66) and the insulation tray (64); The accommodating groove (67) is connected to the top of the upper cover (61) and is used to accommodate an elastic cable (68). One end of the elastic cable (68) is connected to the cable (4), and the other end is connected to the thermometer (66).

3. The underground coal gasification monitoring system according to claim 2, characterized in that: Before measuring the temperature using the temperature measuring component (6), the temperature measuring component (6) is placed in a heating device, and at different temperatures, a standard temperature rise curve of the temperature measuring component (6) from an initial temperature to a stable temperature is recorded; when measuring the temperature using the temperature measuring component (6), an actual temperature rise curve of the temperature measuring component (6) from an initial temperature to a stable temperature is recorded, and a standard temperature rise curve similar to the actual temperature rise curve is found to obtain the actual temperature.

4. The underground coal gasification monitoring system according to claim 2, characterized in that: The upper cover (61) is further provided with a nozzle (610), and the nozzle (610) is connected to a connector (69) located outside the upper cover (61), and the connector (69) can be connected to a corresponding connecting pipe (11).

5. The underground coal gasification monitoring system according to claim 1, characterized in that: The winding assembly (3) comprises: a ratchet (31) fixedly disposed on one side of the protective tube (2); A winding wheel (32) is rotatably sleeved on the outside of the ratchet wheel (31); A plurality of ratchets (33) distributed in a circumferential array, the ratchets (33) being hinged to the inner wall of the reel (32), a first torsion spring being provided between the ratchets and the reel (32), and a magnetic block (34) being embedded in the side wall of the ratchets (33); A plurality of electromagnetic blocks corresponding to the magnetic attraction blocks (34) are embedded in the inner wall of the winding wheel (32).

6. The underground coal gasification monitoring system according to claim 5, characterized in that: A track assembly (7) is sleeved on the outer portion of the upper end of the protection tube (2), wherein the track assembly (7) comprises an upper gear ring (71) and a lower gear ring (72), and the upper gear ring (71) and the lower gear ring (72) are connected via a rod. A moving assembly (8) is movably provided on the track assembly (7), and the moving assembly (8) comprises: A frame (81) is provided with a plurality of outer wheels (82) and a plurality of inner gears (83) rotatably mounted thereon, wherein the outer wheels (82) contact the outer wall of the upper gear ring (71) or the outer wall of the lower gear ring (72), and the inner gears (83) mesh with the teeth of the upper gear ring (71) or the teeth of the lower gear ring (72); a synchronization shaft (84) connected between the two internal gears (83) in the same vertical direction; a motor (85) for driving the synchronous shaft (84) to rotate; A driving wheel (9) is fixed on the frame (81).

7. The underground coal gasification monitoring system according to claim 6, characterized in that: A composite tube (10) is fixed on one side of the frame (81), one end of the composite tube (10) can be connected to the connecting tube (11), and the other end of the composite tube (10) is pumped with air by a suction device or supplied with liquid by a liquid supply device.

8. The underground coal gasification monitoring system according to claim 1, characterized in that: The inner wall of the protection tube (2) is provided with a plurality of guide rail grooves distributed at circumferential intervals, and the outer fixed sleeve of the cable (4) is provided with a slider (5), and the slider (5) is slidably arranged in the guide rail grooves.

9. The underground coal gasification monitoring system according to claim 1, characterized in that: The inner bottom of the protection tube (2) is filled with a heat-conducting filler (12).

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