One-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion traceability system and method

Abstract

The invention belongs to the technical field of gas adsorption and desorption testing, and discloses a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion traceability system which comprises a gas supply unit, a program temperature control box, a vacuum pump and a control unit. A reaction unit is arranged in the program temperature control box and comprises a first preheating pipe, a second preheating pipe, a third preheating pipe, a first reference tank, a second reference tank and a coal sample tank. The invention further provides a testing method of the one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion traceability system. According to the invention, competitive adsorption and desorption under different temperatures and different pressure working conditions in an actual coal mine well and a heating oxidation process under an air leakage condition immediately after competitive adsorption in the coal mine well are fully simulated, so that the continuity and the accuracy of an experiment are improved. The method can be widely applied to the fields of coal mine safety production, gas disaster prevention and control and the like, and has important practical value and social benefit.

Description

Technical Field

[0001] The present invention relates to the technical field of gas adsorption and desorption testing, and in particular to a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system and method. Background Art

[0002] At present, my country's coal resource development is mainly based on underground mining, and gas and coal spontaneous combustion are the two major disasters that threaten the safe production of underground coal mines. With the continuous increase in the depth of coal mining in my country, the problems of "high ground stress, high gas, and high ground temperature" have become increasingly prominent, and a large amount of gas remains in the coal left in the goaf. Gas has multiple superimposed effects on the contact adsorption of coal and oxygen and the coal-oxygen complex reaction, such as dilution, replacement, and competition, resulting in the disaster form of coal spontaneous combustion in the goaf in a gas environment showing a coupled trend, and the reaction process is extremely complex. The combined disaster of gas and coal spontaneous combustion will become a key disaster form that restricts the safe production of coal mines.

[0003] The floating coal and the residual coal in the goaf of coal mines accelerate the temperature rise and oxidation under the condition of continuous air leakage. At the same time, the adsorbed gas contained in the surrounding solid coal is continuously desorbed under negative pressure and flows into the mining space, resulting in the oxidation and spontaneous combustion of the residual coal in the goaf. In fact, it is accompanied by the conversion of adsorbed gas into desorbed gas. This process is called the temperature rise oxidation process of gas-containing coal. Therefore, it is very important to deeply analyze the influence of wind flow gas and adsorbed gas on the spontaneous combustion characteristics of coal and explore the microstructural evolution law of the coal spontaneous combustion process under gas-containing conditions to ensure the safe production of high-gas and self-igniting mines.

[0004] However, at present, there are few test platforms and related research results on the spontaneous combustion characteristics of coal under the conditions of multi-gas competitive adsorption and desorption, and there is also a lack of instruments, equipment and methods directly used for research. At present, when testing the spontaneous combustion characteristics of coal during the temperature rise oxidation process, there are the following defects: (1) Although there are many competitive adsorption-desorption devices at present, they cannot actually simulate the competitive adsorption and desorption under different temperature and pressure conditions in coal mines, nor can they simulate the temperature rise oxidation process under air leakage conditions immediately after competitive adsorption in mines. It is not a continuous process; (2) The existing device cannot immediately perform temperature rise oxidation after the competitive adsorption-desorption test, nor can it realize the temperature rise oxidation process under different desorption times; (3) The existing experimental device cannot directly realize the temperature rise oxidation process in the coal sample tank. The competitive adsorption of mixed gases requires the installation of a mixed gas distributor at the gas inlet of the coal sample tank. This requires consideration of whether the parts at the gas distributor connection match the gas inlet end of the instrument. If not, it is necessary to connect other accessories or reprocess the matching gas inlet interface. The overall test device is complex and the operation is cumbersome; (4) The free volume of the coal sample tank needs to be calibrated before the adsorption test, and the experimental conditions of the test are not uniform; (5) Due to the high pressure of the gas after the oxidation test, the gas needs to be collected using a gas collection bladder and then sent to a gas chromatograph for gas chromatography analysis, which cannot achieve continuous measurement on the same platform. Therefore, there is an urgent need for a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion traceability system and method to realize the continuous whole process simulation test of multi-gas competitive adsorption, desorption and temperature-raising oxidation of gas-containing coal. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system and method.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system, comprising: A gas supply unit, which includes a high-pressure helium gas cylinder, a high-pressure methane gas cylinder, a high-pressure carbon dioxide gas cylinder and a compressed air gas cylinder, which are respectively connected to the main gas supply pipeline; A programmable temperature control box is provided with a reaction unit inside, and the reaction unit includes a first preheating tube, a second preheating tube, a third preheating tube, a first reference tank, a second reference tank and a coal sample tank; the end of the main gas supply pipeline is connected to the air inlets of the first preheating tube, the second preheating tube and the third preheating tube through the first air inlet pipeline, the second air inlet pipeline and the third air inlet pipeline, respectively, and the air outlets of the first preheating tube, the second preheating tube and the third preheating tube are connected to the first reference tank, the second reference tank and the coal sample tank respectively. The gas inlet of the first reference tank and the second reference tank are connected to the gas outlet main pipeline respectively, and the end of the gas outlet main pipeline is connected to the third gas inlet pipeline; the gas outlet of the coal sample tank is connected to the gas outlet pipeline F, and the gas outlet pipeline F forms a first gas outlet branch and a second gas outlet branch, the first gas outlet branch is connected to the gas inlet of the desorber, and the second gas outlet branch is connected to the exhaust port, and the gas outlet of the desorber is connected to the gas chromatograph-mass spectrometer through the gas outlet pipeline G; A vacuum pump is connected to the air inlet of the third preheating tube through a vacuum pumping pipeline and is used to vacuum the interior of the coal sample tank; The control unit includes several stop valves, a PLC controller and a PC. All the stop valves are connected to the PLC controller. The PLC controller controls the action of each stop valve to control the on and off of each pipeline. The PLC controller is connected to the PC. The PLC controller is also connected to a program temperature control box.

[0007] Further, the high-pressure helium cylinder, high-pressure methane cylinder, high-pressure carbon dioxide cylinder and compressed air cylinder are connected to the main gas supply pipeline through the first gas supply branch, the second gas supply branch, the third gas supply branch and the fourth gas supply branch respectively; The gas outlets of the first preheating tube, the second preheating tube and the third preheating tube are connected to the gas inlets of the first reference tank, the second reference tank and the coal sample tank through gas outlet pipeline A, gas outlet pipeline B and gas outlet pipeline C respectively; the gas outlets of the first reference tank and the second reference tank are connected to the gas outlet main pipeline through gas outlet pipeline D and gas outlet pipeline E respectively.

[0008] Further, the plurality of stop valves include a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a fifth stop valve, a sixth stop valve, a seventh stop valve, an eighth stop valve, a ninth stop valve, a tenth stop valve, an eleventh stop valve, a twelfth stop valve, a thirteenth stop valve, a fourteenth stop valve, a fifteenth stop valve, a sixteenth stop valve, a seventeenth stop valve, an eighteenth stop valve, and a nineteenth stop valve; The first stop valve, the second stop valve, the third stop valve and the fourth stop valve are respectively installed on the first air supply branch, the second air supply branch, the third air supply branch and the fourth air supply branch; the fifth stop valve and the high-pressure flowmeter are installed on the main air supply pipeline; the sixth stop valve, the seventh stop valve and the eighth stop valve are respectively installed on the first air inlet pipeline, the second air inlet pipeline and the third air inlet pipeline, the ninth stop valve is installed on the vacuum pipeline, the tenth stop valve is installed on the air outlet pipeline G, the eleventh stop valve, the twelfth stop valve and the fourteenth stop valve are respectively installed on the air outlet pipeline A, the air outlet pipeline B and the air outlet pipeline C, the thirteenth stop valve is installed on the air outlet main pipeline, the fifteenth stop valve and the sixteenth stop valve are respectively installed on the air outlet pipeline D and the air outlet pipeline E, the seventeenth stop valve is installed on the air outlet pipeline F, the eighteenth stop valve and the nineteenth stop valve are respectively installed on the first air outlet branch and the second air outlet branch.

[0009] Furthermore, the first reference tank is provided with a first temperature sensor and a first pressure sensor for monitoring the temperature and pressure in the first reference tank; the second reference tank is provided with a second temperature sensor and a second pressure sensor for monitoring the temperature and pressure in the second reference tank; the coal sample tank is provided with a third temperature sensor and a third pressure sensor for monitoring the temperature and pressure in the coal sample tank; the program temperature control box is provided with a fourth temperature sensor for monitoring the temperature in the program temperature control box; The first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the first pressure sensor, the second pressure sensor, and the third pressure sensor are all connected to the PLC controller.

[0010] The present invention also provides a one-stop test method for the competitive adsorption-desorption-spontaneous combustion tracing system of gas-containing coal, which specifically includes the following steps: S1. Place the test coal sample in the coal sample tank, and put the coal sample tank into a program temperature control box; S2. Air tightness inspection; S3, turning on the vacuum pump to evacuate the coal sample tank; S4. Competitive adsorption test: Open the gas cylinder valve of the high-pressure methane gas cylinder, and successively open the second stop valve, the fifth stop valve, the sixth stop valve, and the eleventh stop valve to introduce methane gas with a pressure of P1 into the first reference tank; Then, the cylinder valve of the compressed air cylinder is opened, and the fourth stop valve, the fifth stop valve, the seventh stop valve, and the twelfth stop valve are opened in sequence to introduce compressed air with a pressure of P1 into the second reference tank; Set the temperature of the programmable temperature control box to T; When the readings of the first pressure sensor and the second pressure sensor on the first reference tank and the second reference tank remain unchanged, close the second stop valve, the fifth stop valve, the sixth stop valve, the eleventh stop valve connected to the high-pressure methane cylinder and the fourth stop valve, the fifth stop valve, the seventh stop valve, and the twelfth stop valve connected to the compressed air cylinder; Open the fifteenth stop valve, the sixteenth stop valve, and the thirteenth stop valve to allow the methane gas and compressed air in the first reference tank and the second reference tank to be fully mixed before entering the coal sample tank. Then open the fourteenth stop valve at the air inlet of the coal sample tank to allow the mixed gas to enter the coal sample tank. Wait for the indication of the third pressure sensor of the coal sample tank to stabilize, and observe whether the indication of the third pressure sensor reaches the preset value of the initial pressure of the coal sample adsorption. If the preset value of the initial pressure is reached, it indicates that the competitive adsorption test has started. Close the fourteenth stop valve, and when the preset equilibrium time is reached, the pressure detection data of the third pressure sensor of the coal sample tank is transmitted to the PLC controller, and the PLC controller finally sends it to the PC to record the coal sample adsorption equilibrium pressure value. If the preset pressure value is not reached, open the fourteenth stop valve, refill the mixed gas into the coal sample tank, wait for the indication of the third pressure sensor of the coal sample tank to stabilize, re-observe the indication of the third pressure sensor, and repeat the above steps until the indication of the third pressure sensor reaches the preset value of the initial pressure of coal sample adsorption; S5. Desorption test: After the competitive adsorption test is completed, open the seventeenth stop valve and the nineteenth stop valve to quickly discharge the free mixed gas in the coal sample tank, then immediately close the nineteenth stop valve and open the eighteenth stop valve to conduct a desorption test. After reaching the set desorption time t, save the desorption data and close all stop valves; S6. Temperature-raising oxidation test: After the desorption test is completed, when the temperature of the program temperature control box drops to room temperature, the temperature of the program temperature control box is set again to carry out a temperature increase oxidation test, and the cylinder valve of the compressed air cylinder and the fourth stop valve, the fifth stop valve, the sixth stop valve, the seventh stop valve, the eleventh stop valve, the twelfth stop valve, the fifteenth stop valve, the sixteenth stop valve, the thirteenth stop valve, the fourteenth stop valve, the seventeenth stop valve, and the eighteenth stop valve are opened to introduce compressed air with a set oxygen concentration of C and a pressure of P2 into the entire platform. During the heating process of the program temperature control box, the compressed air continuously passes through the first reference tank, the second reference tank, and the coal sample tank and then enters the desorber. The tenth stop valve at the gas outlet end of the desorber is opened at intervals to allow the gas that has been heated and oxidized to enter the gas chromatography-mass spectrometry to detect the gas products.

[0011] The present invention also provides a one-stop test method for the competitive adsorption-desorption-spontaneous combustion tracing system of gas-containing coal, which specifically includes the following steps: S1. Place the test coal sample in the coal sample tank, and put the coal sample tank into a program temperature control box; S2. Air tightness inspection; S3, turning on the vacuum pump to evacuate the coal sample tank; S4. Competitive adsorption test: Open the gas cylinder valve of the high-pressure methane gas cylinder, and successively open the second stop valve, the fifth stop valve, the sixth stop valve, and the eleventh stop valve to introduce methane gas with a pressure of P1 into the first reference tank; Then, the gas cylinder valve of the high-pressure carbon dioxide gas cylinder is opened, and the third stop valve, the fifth stop valve, the seventh stop valve, and the twelfth stop valve are opened in sequence to introduce carbon dioxide gas at a pressure of P1 into the second reference tank; Set the temperature of the programmable temperature control box to T; When the readings of the first pressure sensor and the second pressure sensor on the first reference tank and the second reference tank remain unchanged, close the second stop valve, the fifth stop valve, the sixth stop valve, the eleventh stop valve connected to the high-pressure methane gas cylinder and the third stop valve, the fifth stop valve, the seventh stop valve, the twelfth stop valve connected to the high-pressure carbon dioxide gas cylinder; Open the fifteenth stop valve, the sixteenth stop valve, and the thirteenth stop valve to allow the methane gas and the carbon dioxide gas in the first reference tank and the second reference tank to be fully mixed for 15 minutes before entering the coal sample tank. Then open the fourteenth stop valve at the air inlet of the coal sample tank 29 to allow the mixed gas to enter the coal sample tank. After the reading of the third pressure sensor of the coal sample tank is stable, observe whether the reading of the third pressure sensor reaches the preset value of the initial pressure of the coal sample adsorption. If the preset value of the initial pressure is reached, it indicates that the competitive adsorption test has started. Close the fourteenth stop valve. When the preset equilibrium time is reached, the pressure detection data of the third pressure sensor of the coal sample tank is transmitted to the PLC controller, and the PLC controller finally sends it to the PC to record the coal sample adsorption equilibrium pressure value. If the preset pressure value is not reached, refill the mixed gas into the coal sample tank, wait for the reading of the third pressure sensor of the coal sample tank to be stable, re-observe the reading of the third pressure sensor, and repeat the above steps until the reading of the third pressure sensor reaches the preset value of the initial pressure of the coal sample adsorption. S5. Desorption test: After the competitive adsorption test is completed, open the seventeenth stop valve and the nineteenth stop valve to quickly discharge the free mixed gas in the coal sample tank, then immediately close the nineteenth stop valve and open the eighteenth stop valve to conduct a desorption test. After reaching the set desorption time t, save the desorption data and close all stop valves; S6. Temperature-raising oxidation test: After the desorption test is completed, when the temperature of the program temperature control box drops to room temperature, the temperature of the program temperature control box is set again to carry out a temperature increase oxidation test, and the cylinder valve of the compressed air cylinder and the fourth stop valve, the fifth stop valve, the sixth stop valve, the seventh stop valve, the eleventh stop valve, the twelfth stop valve, the fifteenth stop valve, the sixteenth stop valve, the thirteenth stop valve, the fourteenth stop valve, the seventeenth stop valve, and the eighteenth stop valve are opened to introduce compressed air with a set oxygen concentration of C and a pressure of P2 into the entire platform. During the heating process of the program temperature control box, the compressed air continuously passes through the first reference tank, the second reference tank, and the coal sample tank and then enters the desorber. The tenth stop valve at the gas outlet end of the desorber is opened at intervals to allow the gas that has been heated and oxidized to enter the gas chromatography-mass spectrometry to detect the gas products.

[0012] Furthermore, the specific steps of step S1 are: taking the coal sample at the test point for mixing and crushing, grinding to the particle size of 60 mesh to 80 mesh required for the test, weighing the test coal sample according to the experimental weight requirements and placing it in a coal sample tank and sealing it, and placing the coal sample tank in a program temperature controlled box.

[0013] Furthermore, the specific steps of step S2 are: open the cylinder valve of the high-pressure helium cylinder, and open the fifth stop valve, the sixth stop valve, the seventh stop valve, the eighth stop valve, the eleventh stop valve, the twelfth stop valve, the thirteenth stop valve, the fourteenth stop valve, the fifteenth stop valve, the sixteenth stop valve, the seventeenth stop valve, the eighteenth stop valve, the tenth stop valve and the nineteenth stop valve in sequence according to the gas flow direction, check whether there is leakage at each connection node through the pressure curve formed by the readings of the first pressure sensor, the second pressure sensor, the third pressure sensor and the data collected by the PC, and then close all the stop valves.

[0014] Furthermore, in the step S6, the tenth stop valve is opened once every time the temperature of the program-controlled temperature box rises by 10°C.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can realize the competitive adsorption test of multiple gases. Different gases at the same pressure are introduced into the first reference tank and the second reference tank, and then simultaneously enter the third preheating tube above the coal sample tank for mixing, and then competitive adsorption is carried out in the coal sample tank, avoiding the complexity of installing a mixing gas distributor at the gas inlet of the coal sample tank, and there is no need to consider how to fill the same amount of two gases into the mixing gas distributor to ensure the accuracy of the competitive adsorption experiment. The experimental device is simplified and the experimental efficiency is improved.

[0016] (2) The present invention does not need to calibrate the free volume of the coal sample tank before competitive adsorption. The competitive adsorption test can be performed directly by accurately controlling the gas flow and pressure of the gas supply unit and using the pressure sensor and temperature sensor data of the first reference tank, the second reference tank and the coal sample tank, thereby avoiding the error and inconvenience caused by the free volume calibration in the traditional method and further improving the accuracy and reliability of the experiment. At the same time, this design also simplifies the experimental steps and saves experimental time.

[0017] (3) The present invention uses a PLC controller to precisely control each stop valve, thereby achieving precise regulation of the gas flow path. Through the cooperation of the PLC controller and the PC, the data of each sensor can be monitored in real time, and the gas flow, pressure, temperature and other parameters can be automatically adjusted according to the experimental requirements, thus achieving automation and intelligence of the experiment.

[0018] (4) The one-stop design of the present invention enables the continuous simulation test of competitive adsorption, desorption and temperature-raising oxidation under different desorption times to be completed continuously on the same platform, avoiding the tediousness of collecting the gas in the gas collection bladder after gas oxidation and then sending it to the gas chromatograph for analysis.

[0019] In summary, the present invention fully simulates the competitive adsorption and desorption under different temperature and pressure conditions in actual coal mines, and the temperature rise oxidation process under air leakage conditions immediately after competitive adsorption in the mine, which improves the continuity and accuracy of the experiment and provides a powerful tool for in-depth research on the spontaneous combustion characteristics of gas-containing coal. The one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system and method provided by the present invention can be widely used in the fields of coal mine safety production, gas disaster prevention and control, and has important practical value and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a gas adsorption and desorption intelligent testing device under variable temperature conditions of the present invention; Figure 2 It is the control principle diagram of the PLC controller of the present invention; Figure 3 This is a curve diagram obtained from the desorption test of Example 2; Figure 4 This is a fitting curve diagram of the CO generation rate during the spontaneous combustion of heated oxidized coal in Example 2; Description of reference numerals: 1. High-pressure helium cylinder; 2. High-pressure methane cylinder; 3. High-pressure carbon dioxide cylinder; 4. Compressed air cylinder; 5. First stop valve; 6. Second stop valve; 7. Third stop valve; 8. Fourth stop valve; 9. Fifth stop valve; 10. High-pressure flow meter; 11. Sixth stop valve; 12. Seventh stop valve; 13. Eighth stop valve; 14. Ninth stop valve; 15. Vacuum pump; 16. Gas chromatograph-mass spectrometer; 17. Exhaust port; 18. First preheating tube; 19. Second preheating tube; 20. Third preheating tube; 21. Tenth stop valve; 22. Eleventh stop valve; 23. Twelfth stop valve ; 24, the thirteenth stop valve; 25, the fourteenth stop valve; 26, the desorber; 27, the first reference tank; 28, the second reference tank; 29, the coal sample tank; 30, the fifteenth stop valve; 31, the sixteenth stop valve; 32, the seventeenth stop valve; 33, the eighteenth stop valve; 34, the nineteenth stop valve; 35, the PC; 36, the PLC controller; 37, the first temperature sensor; 38, the second temperature sensor; 39, the third temperature sensor; 40, the first pressure sensor; 41, the second pressure sensor; 42, the third pressure sensor; 43, the program temperature control box; 44, the fourth temperature sensor; 100, first air inlet pipeline; 200, second air inlet pipeline; 300, third air inlet pipeline; 400, air outlet pipeline A; 500, air outlet pipeline B; 600, air outlet pipeline C; 700, air outlet pipeline D; 800, air outlet pipeline E; 900, main air outlet pipeline; 1000, vacuum pipeline; 1100, air outlet pipeline F; 1200, first air outlet branch; 1300, second air outlet branch; 1400, air outlet pipeline G; 1500, first air supply branch; 1600, second air supply branch; 1700, third air supply branch; 1800, fourth air supply branch; 1900, main air supply pipeline. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] Embodiment 1

[0023] Reference Figure 1-Figure 2 , a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system, including: A gas supply unit, which includes a high-pressure helium gas cylinder 1, a high-pressure methane gas cylinder 2, a high-pressure carbon dioxide gas cylinder 3 and a compressed air gas cylinder 4, which are respectively connected to the gas supply main pipeline 1900; A programmable temperature control box 43 is provided with a reaction unit inside, and the reaction unit includes a first preheating tube 18, a second preheating tube 19, a third preheating tube 20, a first reference tank 27, a second reference tank 28, and a coal sample tank 29; the end of the gas supply main pipeline 1900 is connected to the air inlets of the first preheating tube 18, the second preheating tube 19, and the third preheating tube 20 through the first air inlet pipeline 100, the second air inlet pipeline 200, and the third air inlet pipeline 300 respectively; the air outlets of the first preheating tube 18, the second preheating tube 19, and the third preheating tube 20 are connected to the air inlets of the first reference tank 27, the second reference tank 28, and the coal sample tank 29 respectively. connected; the gas outlets of the first reference tank 27 and the second reference tank 28 are respectively connected to the gas outlet main pipeline 900, and the end of the gas outlet main pipeline 900 is connected to the third gas inlet pipeline 300; the gas outlet of the coal sample tank 29 is connected to the gas outlet pipeline F1100, and the end of the gas outlet pipeline F1100 forms a first gas outlet branch 1200 and a second gas outlet branch 1300, the first gas outlet branch 1200 is connected to the gas inlet of the desorber 26, and the second gas outlet branch 1300 is connected to the exhaust port 17, and the gas outlet of the desorber 26 is connected to the gas chromatograph-mass spectrometer 16 through the gas outlet pipeline G1400; The vacuum pump 15 is connected to the air inlet of the third preheating tube 20 through the vacuum pumping pipeline 1000, and the vacuum pump 15 is used to evacuate the interior of the coal sample tank 29; The control unit includes a plurality of stop valves, a PLC controller 36 and a PC 35. All the stop valves are connected to the PLC controller 36. The PLC controller 36 controls the operation of each stop valve to control the on and off of each pipeline. The PLC controller 36 is connected to the PC 35. The PLC controller 36 is also connected to a program temperature control box 43.

[0024] The high-pressure helium gas cylinder 1, high-pressure methane gas cylinder 2, high-pressure carbon dioxide gas cylinder 3 and compressed air gas cylinder 4 are respectively connected to the gas supply main pipeline 1900 through the first gas supply branch 1500, the second gas supply branch 1600, the third gas supply branch 1700 and the fourth gas supply branch 1800; the gas outlets of the first preheating tube 18, the second preheating tube 19 and the third preheating tube 20 are respectively connected to the gas inlets of the first reference tank 27, the second reference tank 28 and the coal sample tank 29 through the gas outlet pipeline A400, the gas outlet pipeline B500 and the gas outlet pipeline C600; the gas outlets of the first reference tank 27 and the second reference tank 28 are respectively connected to the gas outlet main pipeline 900 through the gas outlet pipeline D700 and the gas outlet pipeline E800.

[0025] The plurality of stop valves include a first stop valve 5, a second stop valve 6, a third stop valve 7, a fourth stop valve 8, a fifth stop valve 9, a sixth stop valve 11, a seventh stop valve 12, an eighth stop valve 13, a ninth stop valve 14, a tenth stop valve 21, an eleventh stop valve 22, a twelfth stop valve 23, a thirteenth stop valve 24, a fourteenth stop valve 25, a fifteenth stop valve 30, a sixteenth stop valve 31, a seventeenth stop valve 32, an eighteenth stop valve 33, a nineteenth stop valve 34, a PLC controller 36 and a PC 35; The first stop valve 5, the second stop valve 6, the third stop valve 7 and the fourth stop valve 8 are installed on the first gas supply branch 1500, the second gas supply branch 1600, the third gas supply branch 1700 and the fourth gas supply branch 1800; the fifth stop valve 9 and the high-pressure flowmeter 10 are provided on the gas supply main pipeline 1900; the sixth stop valve 11, the seventh stop valve 12 and the eighth stop valve 13 are respectively installed on the first intake pipeline 100, the second intake pipeline 200 and the third intake pipeline 300, the ninth stop valve 14 is installed on the vacuum pipeline 1000, the tenth stop valve 21 is installed on the gas outlet pipeline G1400, and the The eleventh stop valve 22, the twelfth stop valve 23 and the fourteenth stop valve 25 are respectively installed on the outlet pipeline A400, the outlet pipeline B500 and the outlet pipeline C600, the thirteenth stop valve 24 is installed on the main outlet pipeline 900, the fifteenth stop valve 30 and the sixteenth stop valve 31 are respectively installed on the outlet pipeline D700 and the outlet pipeline E800, the seventeenth stop valve 32 is installed on the outlet pipeline F1100, the eighteenth stop valve 33 and the nineteenth stop valve 34 are respectively installed on the first outlet branch 1200 and the second outlet branch 1300, and all the stop valves and the high-pressure flowmeter 10 are connected to the PLC controller 36.

[0026] The first reference tank 27 is provided with a first temperature sensor 37 and a first pressure sensor 40 for monitoring the temperature and pressure in the first reference tank 27; the second reference tank 28 is provided with a second temperature sensor 38 and a second pressure sensor 41 for monitoring the temperature and pressure in the second reference tank 28; the coal sample tank 29 is provided with a third temperature sensor 39 and a third pressure sensor 42 for monitoring the temperature and pressure in the coal sample tank 29; the program temperature control box 43 is provided with a fourth temperature sensor 44 for monitoring the temperature in the program temperature control box 43; The first temperature sensor 37 , the second temperature sensor 38 , the third temperature sensor 39 , the fourth temperature sensor 44 , the first pressure sensor 40 , the second pressure sensor 41 , and the third pressure sensor 42 are all connected to the PLC controller 36 .

[0027] In the present invention, the temperature control range of the program temperature control box 43 is 0-230℃, the temperature control accuracy is ±0.1℃, and the size is 920×745×1420mm; the volume of the first reference tank 27, the second reference tank 28 and the coal sample tank 29 are all 100mL, the pressure resistance is 40MPa, and the tank height and diameter ratio is 2:1; the diameter of the first preheating tube 18, the second preheating tube 19 and the third preheating tube 20 are all 8mm, the material is copper tube, and the length is 10m; the range of all pressure sensors is 0-10MPa, the accuracy is ±0.1Mpa, the range of all temperature sensors is 0-300℃, the accuracy is ±0.1℃; the range of the desorber 26 is 50-5000mL / min; the vacuum pump 15 has an evacuation rate of 14.4m 3 / h, ultimate vacuum pressure 0.2Pa; high pressure flow meter 10 has a range of 0-200mL / min and a control accuracy of ±1mL.

[0028] Embodiment 2

[0029] This embodiment discloses a test method for a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion source tracing system, which is based on the one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion source tracing system disclosed in Example 1. This embodiment conducts a competitive adsorption-desorption-spontaneous combustion test of methane gas and compressed air, which specifically includes the following steps: S1. Take the coal sample of the test point, mix and crush it, grind it to the particle size of 60-80 mesh required for the test, weigh the test coal sample according to the experimental weight requirement, put it in the coal sample tank 29 and seal it. In this embodiment, weigh 50g of the test coal sample, and put the coal sample tank 29 into the program temperature control box 43; S2, air tightness check: open the cylinder valve of the high-pressure helium cylinder 1, and open the fifth stop valve 9, the sixth stop valve 11, the seventh stop valve 12, the eighth stop valve 13, the eleventh stop valve 22, the twelfth stop valve 23, the thirteenth stop valve 24, the fourteenth stop valve 25, the fifteenth stop valve 30, the sixteenth stop valve 31, the seventeenth stop valve 32, the eighteenth stop valve 33, the tenth stop valve 21 and the nineteenth stop valve 34 in sequence according to the gas flow direction, check whether there is leakage at each connection node through the pressure curve formed by the readings of the first pressure sensor 40, the second pressure sensor 41, the third pressure sensor 42 and the data collected by the PC 35, and then close all the stop valves; S3, start the vacuum pump 15 to evacuate the coal sample tank 29; S4. Competitive adsorption test: Open the gas cylinder valve of the high-pressure methane gas cylinder 2, and successively open the second stop valve 6, the fifth stop valve 9, the sixth stop valve 11, and the eleventh stop valve 22, and introduce methane gas with a pressure of P1 into the first reference tank 27; Then, the cylinder valve of the compressed air cylinder 4 is opened, and the fourth stop valve 8, the fifth stop valve 9, the seventh stop valve 12, and the twelfth stop valve 23 are opened in sequence, and compressed air with a pressure of P1 is introduced into the second reference tank 28; Set the temperature of the programmable temperature control box 43 to T; When the readings of the first pressure sensor 40 and the second pressure sensor 41 on the first reference tank 27 and the second reference tank 28 remain unchanged, close the second stop valve 6, the fifth stop valve 9, the sixth stop valve 11, the eleventh stop valve 22 connected to the high-pressure methane cylinder 2 and the fourth stop valve 8, the fifth stop valve 9, the seventh stop valve 12, and the twelfth stop valve 23 connected to the compressed air cylinder 4; Open the fifteenth stop valve 30, the sixteenth stop valve 31, and the thirteenth stop valve 24, so that the methane gas and the compressed air in the first reference tank 27 and the second reference tank 28 are fully mixed for 15 minutes before entering the coal sample tank 29, and then open the fourteenth stop valve 25 at the air inlet of the coal sample tank 29, and the mixed gas enters the coal sample tank 29. After the reading of the third pressure sensor 42 of the coal sample tank 29 is stable, observe whether the reading of the third pressure sensor 42 reaches the preset value of the initial pressure of the coal sample adsorption. If the preset value of the initial pressure is reached, it indicates that the competitive adsorption test has started, and close the fourteenth stop valve 25. When the preset equilibrium time is reached, the pressure detection data of the third pressure sensor 42 of the coal sample tank 29 is transmitted to the PLC controller 36, and the PLC controller 36 finally sends it to the PC 35 to record the coal sample adsorption equilibrium pressure value; If the preset pressure value is not reached, the fourteenth stop valve 25 is opened to add the mixed gas into the coal sample tank 29, and the reading of the third pressure sensor 42 of the coal sample tank 29 is stabilized, and the reading of the third pressure sensor 42 is observed again, and the above steps are repeated until the reading of the third pressure sensor 42 reaches the preset value of the initial pressure of the coal sample adsorption; S5. Desorption test: After the competitive adsorption test is completed, the seventeenth stop valve 32 and the nineteenth stop valve 34 are opened to quickly discharge the free mixed gas in the coal sample tank 29, and then the nineteenth stop valve 34 is immediately closed and the eighteenth stop valve 33 is opened to conduct a desorption test. After the set desorption time t is reached, the desorption data is saved and all stop valves are closed; S6. Temperature-raising oxidation test: After the desorption test is completed, when the temperature of the programmable temperature control box 43 drops to room temperature, the temperature of the programmable temperature control box 43 is set again to perform a temperature increase oxidation test (in this embodiment, the temperature value is set to 230° C.), and the cylinder valve of the compressed air cylinder 4 and the fourth stop valve 8, the fifth stop valve 9, the sixth stop valve 11, the seventh stop valve 12, the eleventh stop valve 22, the twelfth stop valve 23, the fifteenth stop valve 30, the sixteenth stop valve 31, the thirteenth stop valve 24, the fourteenth stop valve 25, and the seventeenth stop valve 26 are opened. The check valve 32 and the eighteenth stop valve 33 are used to introduce compressed air with a set oxygen concentration of C and a pressure of P2 (P2 = 0.4 MPa) to the entire platform. During the heating process of the program temperature control box 43, the compressed air continuously passes through the first reference tank 27, the second reference tank 28, and the coal sample tank 29 before entering the desorber 26. The program temperature control box 43 opens the tenth stop valve 21 at the gas outlet of the desorber 26 every time the temperature rises by 10°C, so that the heated oxidized gas enters the gas chromatography-mass spectrometry instrument 16 to detect the gas product. The tenth stop valve 21 not only reduces the gas pressure, but also realizes that the heated oxidized gas can be directly transmitted to the gas chromatography-mass spectrometry instrument 16 for the detection of gas products.

[0030] Embodiment 3

[0031] This embodiment discloses a test method for a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system, which is based on the one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system disclosed in Example 1. This embodiment conducts a competitive adsorption-desorption-spontaneous combustion test of methane gas and carbon dioxide gas, which specifically includes the following steps: S1, same as in Example 2; S2, same as in Example 2; S3, same as in Example 2; S4. Competitive adsorption test: Open the gas cylinder valve of the high-pressure methane gas cylinder 2, and successively open the second stop valve 6, the fifth stop valve 9, the sixth stop valve 11, and the eleventh stop valve 22, and introduce methane gas with a pressure of P1 into the first reference tank 27; Then, the gas cylinder valve of the high-pressure carbon dioxide gas cylinder 3 is opened, and the third stop valve 7, the fifth stop valve 9, the seventh stop valve 12, and the twelfth stop valve 23 are opened in sequence, and carbon dioxide gas with a pressure of P1 is introduced into the second reference tank 28; Set the temperature of the programmable temperature control box 43 to T; When the readings of the first pressure sensor 40 and the second pressure sensor 41 on the first reference tank 27 and the second reference tank 28 remain unchanged, close the second stop valve 6, the fifth stop valve 9, the sixth stop valve 11, the eleventh stop valve 22 connected to the high-pressure methane gas cylinder 2 and the third stop valve 7, the fifth stop valve 9, the seventh stop valve 12, and the twelfth stop valve 23 connected to the high-pressure carbon dioxide gas cylinder 3; Open the fifteenth stop valve 30, the sixteenth stop valve 31, and the thirteenth stop valve 24, so that the methane gas and the carbon dioxide gas in the first reference tank 27 and the second reference tank 28 are fully mixed for 15 minutes before entering the coal sample tank 29, and then open the fourteenth stop valve 25 at the air inlet of the coal sample tank 29, and the mixed gas enters the coal sample tank 29. After the reading of the third pressure sensor 42 of the coal sample tank 29 is stable, observe whether the reading of the third pressure sensor 42 reaches the preset value of the initial pressure of the coal sample adsorption. If the preset value of the initial pressure is reached, it indicates that the competitive adsorption test has started, and close the fourteenth stop valve 25. When the preset equilibrium time is reached, the pressure detection data of the third pressure sensor 42 of the coal sample tank 29 is transmitted to the PLC controller 36, and the PLC controller 36 finally sends it to the PC 35 to record the coal sample adsorption equilibrium pressure value; If the preset pressure value is not reached, the fourteenth stop valve 25 is opened to add the mixed gas into the coal sample tank 29, and the reading of the third pressure sensor 42 of the coal sample tank 29 is stabilized, and the reading of the third pressure sensor 42 is observed again, and the above steps are repeated until the reading of the third pressure sensor 42 reaches the preset value of the initial pressure of the coal sample adsorption; S5, desorption test: same as in Example 2; S6. Temperature-elevated oxidation test: same as in Example 2.

[0032] In the second and third embodiments of the present invention, the pressure P1 and the temperature T in the competitive adsorption test of step S4 are subjected to an orthogonal test, and the working conditions are shown in Table 1: Table 1 Orthogonal test conditions of pressure P1 and temperature T in competitive adsorption test

[0033] The desorption experiment of step S5 was carried out on the basis of the 20 operating conditions shown in Table 1, and the desorption times t were 0.5h, 1h, 1.5h, 2h and 2.5h respectively. An orthogonal experiment was carried out with different operating conditions of the competitive adsorption test, and a total of 100 groups of desorption experiments under different operating conditions were carried out.

[0034] After the competitive adsorption test in step S4 and the desorption test in step S5 are completed, there are 100 different test operating conditions. In the temperature increase oxidation test in step S6, the oxygen concentration C in the compressed air is set to 21%, 15%, 10% and 5%. At this time, a total of 400 groups of temperature increase oxidation tests under different operating conditions are carried out.

[0035] Taking Example 2 as an example, Figure 3 The figure shows the desorption curve obtained when the desorption time t is 1 h in Example 2. Figure 4 The figure shows the fitting curve of CO generation rate obtained when the oxygen concentration C in the compressed air is 21% and the pressure P2=0.4MPa in Example 2.

[0036] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. One-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system, characterized by: include: A gas supply unit, which includes a high-pressure helium gas cylinder, a high-pressure methane gas cylinder, a high-pressure carbon dioxide gas cylinder and a compressed air gas cylinder, which are respectively connected to the main gas supply pipeline; A programmable temperature control box is provided with a reaction unit inside, and the reaction unit includes a first preheating tube, a second preheating tube, a third preheating tube, a first reference tank, a second reference tank and a coal sample tank; the end of the gas supply main pipeline is connected to the air inlets of the first preheating tube, the second preheating tube and the third preheating tube through the first air inlet pipeline, the second air inlet pipeline and the third air inlet pipeline, respectively, and the air outlets of the first preheating tube, the second preheating tube and the third preheating tube are connected to the air outlets of the first reference tank, the second reference tank and the coal sample tank respectively. The air inlet of the first reference tank and the second reference tank are connected respectively with the main air outlet pipeline, and the end of the main air outlet pipeline is connected to the third air inlet pipeline; the air outlet of the coal sample tank is connected with the air outlet pipeline F, and the end of the air outlet pipeline F forms a first air outlet branch and a second air outlet branch, the first air outlet branch is connected with the air inlet of the desorber, and the second air outlet branch is connected with the exhaust port, and the air outlet of the desorber is connected with the gas chromatograph-mass spectrometer through the air outlet pipeline G; A vacuum pump is connected to the air inlet of the third preheating tube through a vacuum pumping pipeline and is used to vacuum the interior of the coal sample tank; The control unit includes several stop valves, a PLC controller and a PC. All the stop valves are connected to the PLC controller. The PLC controller controls the action of each stop valve to control the on and off of each pipeline. The PLC controller is connected to the PC. The PLC controller is also connected to a program temperature control box.

2. The one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system according to claim 1, characterized in that: The high-pressure helium cylinder, high-pressure methane cylinder, high-pressure carbon dioxide cylinder and compressed air cylinder are connected to the main gas supply pipeline through the first gas supply branch, the second gas supply branch, the third gas supply branch and the fourth gas supply branch respectively; The gas outlets of the first preheating tube, the second preheating tube and the third preheating tube are connected to the gas inlets of the first reference tank, the second reference tank and the coal sample tank through gas outlet pipeline A, gas outlet pipeline B and gas outlet pipeline C respectively; the gas outlets of the first reference tank and the second reference tank are connected to the gas outlet main pipeline through gas outlet pipeline D and gas outlet pipeline E respectively.

3. The one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system according to claim 2, characterized in that: The plurality of stop valves include a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a fifth stop valve, a sixth stop valve, a seventh stop valve, an eighth stop valve, a ninth stop valve, a tenth stop valve, an eleventh stop valve, a twelfth stop valve, a thirteenth stop valve, a fourteenth stop valve, a fifteenth stop valve, a sixteenth stop valve, a seventeenth stop valve, an eighteenth stop valve, and a nineteenth stop valve; The first stop valve, the second stop valve, the third stop valve and the fourth stop valve are respectively installed on the first air supply branch, the second air supply branch, the third air supply branch and the fourth air supply branch; a fifth stop valve and a high-pressure flowmeter are installed on the main air supply pipeline; the sixth stop valve, the seventh stop valve and the eighth stop valve are respectively installed on the first air inlet pipeline, the second air inlet pipeline and the third air inlet pipeline, the ninth stop valve is installed on the vacuum pipeline, the tenth stop valve is installed on the air outlet pipeline G, the eleventh stop valve, the twelfth stop valve and the fourteenth stop valve are respectively installed on the air outlet pipeline A, the air outlet pipeline B and the air outlet pipeline C, the thirteenth stop valve is installed on the air outlet main pipeline, the fifteenth stop valve and the sixteenth stop valve are respectively installed on the air outlet pipeline D and the air outlet pipeline E, the seventeenth stop valve is installed on the air outlet pipeline F, the eighteenth stop valve and the nineteenth stop valve are respectively installed on the first air outlet branch and the second air outlet branch, and all stop valves and high-pressure flowmeters are connected to the PLC controller.

4. The one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system according to claim 3, characterized in that: The first reference tank is provided with a first temperature sensor and a first pressure sensor for monitoring the temperature and pressure in the first reference tank; the second reference tank is provided with a second temperature sensor and a second pressure sensor for monitoring the temperature and pressure in the second reference tank; the coal sample tank is provided with a third temperature sensor and a third pressure sensor for monitoring the temperature and pressure in the coal sample tank; the program temperature control box is provided with a fourth temperature sensor for monitoring the temperature in the program temperature control box; The first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the first pressure sensor, the second pressure sensor, and the third pressure sensor are all connected to the PLC controller.

5. A testing method for a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system is implemented by using the one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system according to claim 4, characterized in that: The specific steps include: S1. Place the test coal sample in the coal sample tank, and put the coal sample tank into a program temperature control box; S2. Air tightness inspection; S3, turning on the vacuum pump to evacuate the coal sample tank; S4. Competitive adsorption test: Open the gas cylinder valve of the high-pressure methane gas cylinder, and successively open the second stop valve, the fifth stop valve, the sixth stop valve, and the eleventh stop valve to introduce methane gas with a pressure of P1 into the first reference tank; Then, the cylinder valve of the compressed air cylinder is opened, and the fourth stop valve, the fifth stop valve, the seventh stop valve, and the twelfth stop valve are opened in sequence to introduce compressed air with a pressure of P1 into the second reference tank; Set the temperature of the programmable temperature control box to T; When the readings of the first pressure sensor and the second pressure sensor on the first reference tank and the second reference tank remain unchanged, close the second stop valve, the fifth stop valve, the sixth stop valve, the eleventh stop valve connected to the high-pressure methane cylinder and the fourth stop valve, the fifth stop valve, the seventh stop valve, and the twelfth stop valve connected to the compressed air cylinder; Open the fifteenth stop valve, the sixteenth stop valve, and the thirteenth stop valve to allow the methane gas and compressed air in the first reference tank and the second reference tank to be fully mixed before entering the coal sample tank. Then open the fourteenth stop valve at the air inlet of the coal sample tank to allow the mixed gas to enter the coal sample tank. Wait for the indication of the third pressure sensor of the coal sample tank to stabilize, and observe whether the indication of the third pressure sensor reaches the preset value of the initial pressure of the coal sample adsorption. If the preset value of the initial pressure is reached, it indicates that the competitive adsorption test has started. Close the fourteenth stop valve, and when the preset equilibrium time is reached, the pressure detection data of the third pressure sensor of the coal sample tank is transmitted to the PLC controller, and the PLC controller finally sends it to the PC to record the coal sample adsorption equilibrium pressure value. If the preset pressure value is not reached, open the fourteenth stop valve, refill the mixed gas into the coal sample tank, wait for the indication of the third pressure sensor of the coal sample tank to stabilize, re-observe the indication of the third pressure sensor, and repeat the above steps until the indication of the third pressure sensor reaches the preset value of the initial pressure of coal sample adsorption; S5. Desorption test: After the competitive adsorption test is completed, open the seventeenth stop valve and the nineteenth stop valve to quickly discharge the free mixed gas in the coal sample tank, then immediately close the nineteenth stop valve and open the eighteenth stop valve to conduct a desorption test. After reaching the set desorption time t, save the desorption data and close all stop valves; S6. Temperature-raising oxidation test: After the desorption test is completed, when the temperature of the program temperature control box drops to room temperature, the temperature of the program temperature control box is set again to carry out a temperature increase oxidation test, and the cylinder valve of the compressed air cylinder and the fourth stop valve, the fifth stop valve, the sixth stop valve, the seventh stop valve, the eleventh stop valve, the twelfth stop valve, the fifteenth stop valve, the sixteenth stop valve, the thirteenth stop valve, the fourteenth stop valve, the seventeenth stop valve, and the eighteenth stop valve are opened to introduce compressed air with a set oxygen concentration of C and a pressure of P2 into the entire platform. During the heating process of the program temperature control box, the compressed air continuously passes through the first reference tank, the second reference tank, and the coal sample tank and then enters the desorber, and then the tenth stop valve at the outlet of the desorber is opened at intervals to allow the gas that has undergone temperature increase oxidation to enter the gas chromatography-mass spectrometry to detect the gas products.

6. A testing method for a one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system is implemented by using the one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system according to claim 4, characterized in that: The specific steps include: S1. Place the test coal sample in the coal sample tank, and put the coal sample tank into a program temperature control box; S2. Air tightness inspection; S3, turning on the vacuum pump to evacuate the coal sample tank; S4. Competitive adsorption test: Open the gas cylinder valve of the high-pressure methane gas cylinder, and successively open the second stop valve, the fifth stop valve, the sixth stop valve, and the eleventh stop valve to introduce methane gas with a pressure of P1 into the first reference tank; Then, the gas cylinder valve of the high-pressure carbon dioxide gas cylinder is opened, and the third stop valve, the fifth stop valve, the seventh stop valve, and the twelfth stop valve are opened in sequence to introduce carbon dioxide gas at a pressure of P1 into the second reference tank; Set the temperature of the programmable temperature control box to T; When the readings of the first pressure sensor and the second pressure sensor on the first reference tank and the second reference tank remain unchanged, close the second stop valve, the fifth stop valve, the sixth stop valve, the eleventh stop valve connected to the high-pressure methane gas cylinder and the third stop valve, the fifth stop valve, the seventh stop valve, the twelfth stop valve connected to the high-pressure carbon dioxide gas cylinder; Open the fifteenth stop valve, the sixteenth stop valve, and the thirteenth stop valve to allow the methane gas and the carbon dioxide gas in the first reference tank and the second reference tank to be fully mixed for 15 minutes before entering the coal sample tank. Then open the fourteenth stop valve at the air inlet of the coal sample tank to allow the mixed gas to enter the coal sample tank. Wait for the indication of the third pressure sensor of the coal sample tank to stabilize, and observe whether the indication of the third pressure sensor reaches the preset value of the initial pressure of the coal sample adsorption. If the preset value of the initial pressure is reached, it indicates that the competitive adsorption test has started, and close the fourteenth stop valve. When the preset equilibrium time is reached, the pressure detection data of the third pressure sensor of the coal sample tank is transmitted to the PLC controller, and the PLC controller finally sends it to the PC to record the coal sample adsorption equilibrium pressure value. If the preset pressure value is not reached, the mixed gas is refilled into the coal sample tank, and the indication of the third pressure sensor of the coal sample tank is stabilized, and the indication of the third pressure sensor is observed again, and the above steps are repeated until the indication of the third pressure sensor reaches the preset value of the initial pressure of the coal sample adsorption; S5. Desorption test: After the competitive adsorption test is completed, open the seventeenth stop valve and the nineteenth stop valve to quickly discharge the free mixed gas in the coal sample tank, then immediately close the nineteenth stop valve and open the eighteenth stop valve to conduct a desorption test. After reaching the set desorption time t, save the desorption data and close all stop valves; S6. Temperature-raising oxidation test: After the desorption test is completed, when the temperature of the program temperature control box drops to room temperature, the temperature of the program temperature control box is set again to carry out a temperature increase oxidation test, and the cylinder valve of the compressed air cylinder and the fourth stop valve, the fifth stop valve, the sixth stop valve, the seventh stop valve, the eleventh stop valve, the twelfth stop valve, the fifteenth stop valve, the sixteenth stop valve, the thirteenth stop valve, the fourteenth stop valve, the seventeenth stop valve, and the eighteenth stop valve are opened to introduce compressed air with a set oxygen concentration of C and a pressure of P2 into the entire platform. During the heating process of the program temperature control box, the compressed air continuously passes through the first reference tank, the second reference tank, and the coal sample tank and then enters the desorber. The tenth stop valve at the gas outlet end of the desorber is opened at intervals to allow the gas that has been heated and oxidized to enter the gas chromatography-mass spectrometry to detect the gas products.

7. The testing method of the one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system according to claim 5 or 6, characterized in that: The specific steps of step S1 are: taking the coal sample of the test point for mixing and crushing, grinding to the particle size of 60 mesh to 80 mesh required for the test, weighing the test coal sample according to the experimental weight requirement and placing it in a coal sample tank and sealing it, and placing the coal sample tank in a program temperature controlled box.

8. The testing method of the one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system according to claim 5 or 6, characterized in that: The specific steps of step S2 are: open the cylinder valve of the high-pressure helium cylinder, and open the fifth stop valve, the sixth stop valve, the seventh stop valve, the eighth stop valve, the eleventh stop valve, the twelfth stop valve, the thirteenth stop valve, the fourteenth stop valve, the fifteenth stop valve, the sixteenth stop valve, the seventeenth stop valve, the eighteenth stop valve, the tenth stop valve and the nineteenth stop valve in sequence according to the gas flow direction, check whether there is leakage at each connection node through the pressure curve formed by the readings of the first pressure sensor, the second pressure sensor, the third pressure sensor and the data collected by the PC, and then close all the stop valves.

9. The testing method of the one-stop gas-containing coal competitive adsorption-desorption-spontaneous combustion tracing system according to claim 5 or 6, characterized in that: In the step S6, the tenth stop valve is opened once every time the temperature of the program-controlled temperature box rises by 10°C.

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