A multi-channel coal bed methane natural desorption amount automatic determination device and a determination method thereof

Abstract

A kind of multi-path coalbed methane natural desorption amount automatic determination device and determination method thereof, including coal sample desorption tank placed in corresponding temperature regulator, electromagnetic valve, electromagnetic valve II, pressure reducing valve, speed regulating valve, speed regulating valve, electronic flowmeter I, electronic flowmeter II are respectively arranged on each coal sample desorption tank corresponding gas pipeline, corresponding temperature regulator, automatic valve, electromagnetic valve, pressure reducing valve, speed regulating valve, electronic flowmeter are controlled using control acquisition board to work, to realize the determination of multi-path coalbed methane natural desorption amount, the present application can determine the natural desorption amount of multi-path coalbed methane under the premise that each road does not affect each other, simultaneously realize the control of gas path each valve and the acquisition of flow data, can greatly improve the determination efficiency of coalbed methane natural desorption amount, and full-process automation, reduce the error of traditional manual reading.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of coalbed methane natural desorption quantity measuring device and process, specifically a kind of multi-channel coalbed methane natural desorption quantity automatic determination device and its determination method, belong to coalbed methane content determination test equipment technical field. BACKGROUND

[0002] Coalbed methane content is one of the key parameters to characterize coal reservoir characteristics, whether it is coalbed methane resource quantity calculation in coalbed methane resource exploration and development, coalbed methane well productivity prediction, resource development potential evaluation, development target area optimization and well pattern layout, or coal seam gas hazard degree evaluation, mine gas emission prediction, ventilation design and management, etc. Coalbed methane content data must be used.

[0003] Coalbed methane natural desorption quantity is an important part of coalbed methane content, and currently drainage method is often used to read coalbed methane desorption quantity, but traditional drainage cylinder has low precision, and data needs to be read manually, so determination process is complicated. In actual determination of coalbed methane content, the determination time of direct desorption quantity of a single coal sample is more than 8h, and multiple coal samples often need to be determined simultaneously, which further increases the time and labor cost, and easily causes data reading error. SUMMARY

[0004] The purpose of the present application is to provide a kind of multi-channel coalbed methane natural desorption quantity automatic determination device and its determination method, which has simple structure, high determination precision, can determine multi-channel coalbed methane natural desorption quantity under the premise of not affecting each other, synchronously realizes the control of each valve in gas circuit and the collection of flow data, can greatly improve the determination efficiency of coalbed methane natural desorption quantity, and fully realizes automation, reduces the error of traditional manual reading.

[0005] In order to achieve the above purpose, the present application provides a kind of multi-channel coalbed methane natural desorption quantity automatic determination device, which comprises coal sample desorption tank I, coal sample desorption tank II and coal sample desorption tank III, and the coal sample desorption tank I, the coal sample desorption tank II and the coal sample desorption tank III are respectively placed in temperature regulator I, temperature regulator II and temperature regulator II.

[0006] The coal sample desorption tank I is connected with one end of automatic valve I through gas pipeline, the other end of automatic valve I is connected with one end of electromagnetic valve I and electromagnetic valve II through gas pipeline, the other end of electromagnetic valve I is connected with one end of speed regulating valve I through gas pipeline after connecting with pressure reducing valve, the other end of electromagnetic valve II is connected with one end of speed regulating valve II through gas pipeline, the other end of speed regulating valve I and the other end of speed regulating valve II are connected with one end of control collection board, the other end of control collection board is connected with exhaust port, and electronic flowmeter I and electronic flowmeter II are placed in control collection board.

[0007] The coal sample desorption tank 2 is connected with one end of the automatic valve 2 through a gas pipeline, the coal sample desorption tank 3 is connected with one end of the automatic valve 3 through a gas pipeline, the other end of the automatic valve 2 is connected with one end of the electromagnetic valve 3 and the electromagnetic valve 4 through a gas pipeline, the other end of the automatic valve 3 is connected with one end of the electromagnetic valve 5 and the electromagnetic valve 6 through a gas pipeline, the other end of the electromagnetic valve 3 and the electromagnetic valve 5 are connected with the gas inlet pipeline of the pressure reducing valve, and the other end of the electromagnetic valve 4 and the electromagnetic valve 6 are connected with the gas inlet pipeline of the speed regulating valve 2.

[0008] The temperature regulator 1, the temperature regulator 2, the temperature regulator 3, the automatic valve 1, the automatic valve 2, the automatic valve 3, the electromagnetic valve 1, the electromagnetic valve 2, the electromagnetic valve 3, the electromagnetic valve 4, the electromagnetic valve 5, the electromagnetic valve 6, the pressure reducing valve, the speed regulating valve 1 and the speed regulating valve 2 are connected with the control collection board through an electronic circuit.

[0009] The coal sample desorption tank 1, the coal sample desorption tank 2 and the coal sample desorption tank 3 are all cylindrical, the height is not less than 30 cm, the volume is not less than 1000 cm 3 , and can maintain airtightness under a pressure of 0.5 MPa.

[0010] The range of the electronic flowmeter 1 is 0-1000 sccm, and the working pressure is 0-0.5 MPa, and the range of the electronic flowmeter 2 is 0-100 sccm, and the working pressure is 0-0.5 MPa.

[0011] The temperature regulation range of the temperature regulator 1, the temperature regulator 2 and the temperature regulator 3 is 0-100 DEG C.

[0012] The range of the pressure reducing valve is 0-1.2 MPa.

[0013] A kind of determination method of the determination device of the multi-path coalbed methane natural desorption quantity automation, comprising the following steps:

[0014] ①Drilling is constructed in ground, and the coal sample obtained is placed in each coal sample desorption tank, to ensure the airtightness of the coal sample desorption tank;

[0015] ②Turn on the power supply of the determination device, operate the control collection board, and adjust the temperature of the temperature regulator 1, the temperature regulator 2 and the temperature regulator 3 to the reservoir temperature of the coal sample;

[0016] ③Control the acquisition board to control the opening of automatic valve I, and the desorption of coal sample desorption tank I starts. Control the acquisition board to control the opening of electromagnetic valve I. Adjust the pressure reducing valve to limit the pressure in the gas pipeline within the working pressure 0-0.5 MPa of the electronic flow meter. Adjust the speed regulating valve I to limit the gas flow in the pipeline within the highest range 1000 sccm of the electronic flow meter I. The acquisition board collects and processes the data of the electronic flow meter I. After the acquisition board monitors that the gas flow in the pipeline is lower than 150 sccm for more than 2 s, control electromagnetic valve I to close, electromagnetic valve II to open, adjust the speed regulating valve II to limit the gas flow in the pipeline within 1000 sccm, collect and process the data of the electronic flow meter I. When the gas flow in the pipeline is reduced to 100 sccm, collect and process the data of the electronic flow meter II. After the acquisition board monitors that the gas flow in the pipeline is lower than 5 sccm for more than 2 s, control electromagnetic valve II to close, and close automatic valve I, end the desorption measurement of coal sample desorption tank I, and wait for subsequent test;

[0017] ④Control the acquisition board to control the opening of automatic valve II, and the desorption of coal sample desorption tank II starts. Control the acquisition board to control the opening of electromagnetic valve III. Adjust the pressure reducing valve to limit the pressure in the gas pipeline within the working pressure 0-0.5 MPa of the electronic flow meter. Adjust the speed regulating valve I to limit the gas flow in the pipeline within the highest range 1000 sccm of the electronic flow meter I. The acquisition board collects and processes the data of the electronic flow meter I. After the acquisition board monitors that the gas flow in the pipeline is lower than 150 sccm for more than 2 s, control electromagnetic valve III to close, electromagnetic valve IV to open, adjust the speed regulating valve II to limit the gas flow in the pipeline within 1000 sccm, collect and process the data of the electronic flow meter I. When the gas flow in the pipeline is reduced to 100 sccm, collect and process the data of the electronic flow meter II. After the acquisition board monitors that the gas flow in the pipeline is lower than 5 sccm for more than 2 s, control electromagnetic valve IV to close, and close automatic valve II, end the desorption measurement of coal sample desorption tank II, and wait for subsequent test;

[0018] V is opened, the pressure in the gas pipeline is limited to the working pressure of the electronic flow meter 0-0.5MPa by adjusting the pressure reducing valve, the gas flow in the pipeline is limited to the highest range of 1000sccm of the electronic flow meter I by adjusting the speed regulating valve I, and the data of the electronic flow meter I is collected and processed by the control collection board; after the control collection board monitors that the gas flow in the pipeline is lower than 150sccm for more than 2s, the electromagnetic valve V is closed, the electromagnetic valve VI is opened, the gas flow in the pipeline is limited to 1000sccm by adjusting the speed regulating valve II, the data of the electronic flow meter I is collected and processed, and when the gas flow in the pipeline is reduced to 100sccm, the data of the electronic flow meter II is collected and processed; after the control collection board monitors that the gas flow in the pipeline is lower than 5sccm for more than 2s, the electromagnetic valve VI is closed, and the automatic valve III is closed, the desorption measurement of the coal sample desorption tank III is ended, and subsequent tests are waited;

[0019] VI, the gas flow in the pipeline is limited to 1000sccm by adjusting the speed regulating valve II, the data of the electronic flow meter I is collected and processed, and when the gas flow in the pipeline is reduced to 100sccm, the data of the electronic flow meter II is collected and processed; after the control collection board monitors that the gas flow in the pipeline is lower than 5sccm for more than 2s, the electromagnetic valve VI is closed, and the automatic valve III is closed, the desorption measurement of the coal sample desorption tank III is ended, and subsequent tests are waited;

[0020] VI, the gas flow in the pipeline is limited to 1000sccm by adjusting the speed regulating valve II, the data of the electronic flow meter I is collected and processed, and when the gas flow in the pipeline is reduced to 100sccm, the data of the electronic flow meter II is collected and processed; after the control collection board monitors that the gas flow in the pipeline is lower than 5sccm for more than 2s, the electromagnetic valve VI is closed, and the automatic valve III is closed, the desorption measurement of the coal sample desorption tank III is ended, and subsequent tests are waited; 3 After that, the measurement is ended, and the measurement data is automatically analyzed and exported.

[0021] The single measurement time of each channel is not more than 2min; the opening and closing switching time of the automatic valve I, the automatic valve II, the automatic valve III, the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III, the electromagnetic valve IV, the electromagnetic valve V and the electromagnetic valve VI is less than 2s; the collection frequency of the electronic flow meter I and the electronic flow meter II is 1hz, and the collection accuracy is 0.01ml.

[0022] Compared with the prior art, the three coal sample desorption tanks are respectively placed in temperature regulators, the temperature of the coal sample is set through the corresponding temperature regulator, the electromagnetic valve, the electromagnetic valve II, the pressure reducing valve, the speed regulating valve, the speed regulating valve, the electronic flowmeter I and the electronic flowmeter II are respectively arranged on the gas pipeline corresponding to each coal sample desorption tank, the working of the corresponding temperature regulator, the automatic valve, the electromagnetic valve, the pressure reducing valve, the speed regulating valve and the electronic flowmeter is controlled by the control collection board, and the natural desorption amount of the coal bed gas is measured in multiple ways, the natural desorption amount of the coal bed gas in multiple ways can be measured under the premise that the multiple ways do not affect each other, the control of the valves in the gas pipeline and the collection of the flow data are simultaneously realized, the measurement efficiency of the natural desorption amount of the coal bed gas can be greatly improved, and the whole process is automated, and the error of the traditional manual reading is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a working principle schematic diagram of the present application.

[0024] In the figure: 1, temperature regulator I, 2, temperature regulator II, 3, temperature regulator III, 4, coal sample desorption tank I, 5, coal sample desorption tank II, 6, coal sample desorption tank III, 7, automatic valve I, 8, automatic valve II, 9, automatic valve III, 10, electromagnetic valve I, 11, electromagnetic valve II, 12, electromagnetic valve III, 13, electromagnetic valve IV, 14, electromagnetic valve V, 15, electromagnetic valve VI, 16, pressure reducing valve, 17, speed regulating valve I, 18, speed regulating valve II, 19, control collection board, 20, electronic flowmeter I, 21, electronic flowmeter II, 22, exhaust port. DETAILED DESCRIPTION

[0025] The present application will be further described below in combination with the drawings.

[0026] As Figure 1 shown, a multiple-way coal bed gas natural desorption amount automatic measurement device, comprising coal sample desorption tank I 4, coal sample desorption tank II 5, coal sample desorption tank III 6, the coal sample desorption tank I 4, the coal sample desorption tank II 5, the coal sample desorption tank III 6 are respectively arranged in the temperature regulator I 1, the temperature regulator II 2, the temperature regulator II 3,

[0027] The coal sample desorption tank I 4 is connected with one end of the automatic valve I 7 through the gas pipeline, the other end of the automatic valve I 7 is connected with one end of the electromagnetic valve I 10 and the electromagnetic valve II 11 through the gas pipeline, the other end of the electromagnetic valve I 10 is connected with one end of the speed regulating valve I 17 through the gas pipeline after being connected with the pressure reducing valve 16, the other end of the electromagnetic valve II 11 is connected with one end of the speed regulating valve II 18 through the gas pipeline, the other end of the speed regulating valve I 17 and the other end of the speed regulating valve II 18 are connected with one end of the control collection board 19, the other end of the control collection board 19 is connected with the exhaust port 22, the electronic flowmeter I 20 and the electronic flowmeter II 21 are arranged in the control collection board 19.

[0028] The coal sample desorption tank II 5 is connected with one end of the automatic valve II 8 through a gas pipeline, the coal sample desorption tank III 6 is connected with one end of the automatic valve III 9 through a gas pipeline, the other end of the automatic valve II 8 is connected with one end of the electromagnetic valve III 12 and the electromagnetic valve IV 13 through a gas pipeline, the other end of the automatic valve III 9 is connected with one end of the electromagnetic valve V 14 and the electromagnetic valve VI 15 through a gas pipeline, the other end of the electromagnetic valve III 12 and the other end of the electromagnetic valve V 14 are connected with the gas inlet pipeline of the pressure reducing valve 16, the other end of the electromagnetic valve IV 13 and the other end of the electromagnetic valve VI 15 are connected with the gas inlet pipeline of the speed regulating valve II 18;

[0029] The temperature regulator I 1, the temperature regulator II 2, the temperature regulator III 3, the automatic valve I 7, the automatic valve II 8, the automatic valve III 9, the electromagnetic valve I 10, the electromagnetic valve II 11, the electromagnetic valve III 12, the electromagnetic valve IV 13, the electromagnetic valve V 14, the electromagnetic valve VI 15, the pressure reducing valve 16, the speed regulating valve I 17, the speed regulating valve II 18, the electronic flowmeter I 20 and the electronic flowmeter II 21 are connected with the control collection board 19 through an electronic circuit.

[0030] The coal sample desorption tank I 4, the coal sample desorption tank II 5 and the coal sample desorption tank III 6 are all cylindrical, the height is not less than 30 cm, the volume is not less than 1000 cm 3 , and can maintain airtightness under 0.5 MPa pressure.

[0031] The range of the electronic flowmeter I 20 is 0-1000 sccm, and the working pressure is 0-0.5 MPa, the range of the electronic flowmeter II 21 is 0-100 sccm, and the working pressure is 0-0.5 MPa.

[0032] The temperature regulation range of the temperature regulator I 1, the temperature regulator II 2 and the temperature regulator III 3 is 0-100℃.

[0033] The range of the pressure reducing valve 16 is 0-1.2 MPa.

[0034] A kind of determination method of the determination device of the multi-path coalbed methane natural desorption quantity automation, comprising the following steps:

[0035] ①Drilling is constructed in ground to sample, and the coal sample obtained is placed in each coal sample desorption tank, to ensure the airtightness of the coal sample desorption tank;

[0036] ②Turn on the power supply of determination device, operate the control collection board 19, and adjust the temperature of the temperature regulator I 1, the temperature regulator II 2 and the temperature regulator III 3 to the reservoir temperature of coal sample;

[0037] ③Control the control board 19 to control open automatic valve 17, coal sample desorption tank 14 begins to desorb, control the control board 19 to control solenoid valve 110 open, adjust pressure reducing valve 16 to limit the pressure in the gas pipeline in the working pressure 0-0.5MPa of electronic flow meter, adjust the flow regulating valve 117 to limit the gas flow in the pipeline in the highest range 1000sccm of electronic flow meter 120, control the control board 19 to collect and process the data of electronic flow meter 120; Control the control board 19 to monitor the gas flow in the pipeline to be less than 150sccm for more than 2s, control solenoid valve 110 to close, solenoid valve 111 to open, adjust the flow regulating valve 118 to limit the gas flow in the pipeline in 1000sccm, collect and process the data of electronic flow meter 120, when the gas flow in the pipeline reduces to 100sccm, collect and process the data of electronic flow meter 211; Control the control board 19 to monitor the gas flow in the pipeline to be less than 5sccm for more than 2s, control solenoid valve 111 to close, and close automatic valve 17, end the desorption measurement of coal sample desorption tank 14, wait for subsequent test;

[0038] ④Control the control board 19 to control open automatic valve 18, coal sample desorption tank 15 begins to desorb, control the control board 19 to control solenoid valve 112 open, adjust pressure reducing valve 16 to limit the pressure in the gas pipeline in the working pressure 0-0.5MPa of electronic flow meter, adjust the flow regulating valve 117 to limit the gas flow in the pipeline in the highest range 1000sccm of electronic flow meter 120, control the control board 19 to collect and process the data of electronic flow meter 120; Control the control board 19 to monitor the gas flow in the pipeline to be less than 150sccm for more than 2s, control solenoid valve 112 to close, solenoid valve 113 to open, adjust the flow regulating valve 118 to limit the gas flow in the pipeline in 1000sccm, collect and process the data of electronic flow meter 120, when the gas flow in the pipeline reduces to 100sccm, collect and process the data of electronic flow meter 211; Control the control board 19 to monitor the gas flow in the pipeline to be less than 5sccm for more than 2s, control solenoid valve 113 to close, and close automatic valve 18, end the desorption measurement of coal sample desorption tank 15, wait for subsequent test;

[0039] V. 14 is opened, the pressure in the gas pipeline is limited to the working pressure of the electronic flow meter 0-0.5 MPa by adjusting the pressure reducing valve 16, the gas flow in the pipeline is limited to the highest range 1000 sccm of the electronic flow meter 120 by adjusting the speed regulating valve 117, and the data of the electronic flow meter 120 is collected and processed by the control acquisition board 19; after the control acquisition board 19 monitors that the gas flow in the pipeline is lower than 150 sccm for more than 2 s, the electromagnetic valve 114 is closed, the electromagnetic valve 115 is opened, the gas flow in the pipeline is limited to 1000 sccm by adjusting the speed regulating valve 118, the data of the electronic flow meter 120 is collected and processed, and when the gas flow in the pipeline is reduced to 100 sccm, the data of the electronic flow meter 121 is collected and processed; after the control acquisition board 19 monitors that the gas flow in the pipeline is lower than 5 sccm for more than 2 s, the electromagnetic valve 115 is closed, and the automatic valve 119 is closed, the desorption measurement of the coal sample desorption tank 116 is ended, and subsequent tests are waited for;

[0040] V. 14 is opened, the pressure in the gas pipeline is limited to the working pressure of the electronic flow meter 0-0.5 MPa by adjusting the pressure reducing valve 16, the gas flow in the pipeline is limited to the highest range 1000 sccm of the electronic flow meter 120 by adjusting the speed regulating valve 117, and the data of the electronic flow meter 120 is collected and processed by the control acquisition board 19; after the control acquisition board 19 monitors that the gas flow in the pipeline is lower than 150 sccm for more than 2 s, the electromagnetic valve 114 is closed, the electromagnetic valve 115 is opened, the gas flow in the pipeline is limited to 1000 sccm by adjusting the speed regulating valve 118, the data of the electronic flow meter 120 is collected and processed, and when the gas flow in the pipeline is reduced to 100 sccm, the data of the electronic flow meter 121 is collected and processed; after the control acquisition board 19 monitors that the gas flow in the pipeline is lower than 5 sccm for more than 2 s, the electromagnetic valve 115 is closed, and the automatic valve 119 is closed, the desorption measurement of the coal sample desorption tank 116 is ended, and subsequent tests are waited for;

[0041] V. 14 is opened, the pressure in the gas pipeline is limited to the working pressure of the electronic flow meter 0-0.5 MPa by adjusting the pressure reducing valve 16, the gas flow in the pipeline is limited to the highest range 1000 sccm of the electronic flow meter 120 by adjusting the speed regulating valve 117, and the data of the electronic flow meter 120 is collected and processed by the control acquisition board 19; after the control acquisition board 19 monitors that the gas flow in the pipeline is lower than 150 sccm for more than 2 s, the electromagnetic valve 114 is closed, the electromagnetic valve 115 is opened, the gas flow in the pipeline is limited to 1000 sccm by adjusting the speed regulating valve 118, the data of the electronic flow meter 120 is collected and processed, and when the gas flow in the pipeline is reduced to 100 sccm, the data of the electronic flow meter 121 is collected and processed; after the control acquisition board 19 monitors that the gas flow in the pipeline is lower than 5 sccm for more than 2 s, the electromagnetic valve 115 is closed, and the automatic valve 119 is closed, the desorption measurement of the coal sample desorption tank 116 is ended, and subsequent tests are waited for; 3 V. 14 is opened, the pressure in the gas pipeline is limited to the working pressure of the electronic flow meter 0-0.5 MPa by adjusting the pressure reducing valve 16, the gas flow in the pipeline is limited to the highest range 1000 sccm of the electronic flow meter 120 by adjusting the speed regulating valve 117, and the data of the electronic flow meter 120 is collected and processed by the control acquisition board 19; after the control acquisition board 19 monitors that the gas flow in the pipeline is lower than 150 sccm for more than 2 s, the electromagnetic valve 114 is closed, the electromagnetic valve 115 is opened, the gas flow in the pipeline is limited to 1000 sccm by adjusting the speed regulating valve 118, the data of the electronic flow meter 120 is collected and processed, and when the gas flow in the pipeline is reduced to 100 sccm, the data of the electronic flow meter 121 is collected and processed; after the control acquisition board 19 monitors that the gas flow in the pipeline is lower than 5 sccm for more than 2 s, the electromagnetic valve 115 is closed, and the automatic valve 119 is closed, the desorption measurement of the coal sample desorption tank 116 is ended, and subsequent tests are waited for;

[0042] The single measurement time of each channel is not more than 2 min; the opening and closing switching time of the automatic valves 117, 118, 119, the electromagnetic valves 110, 111, 112, 113, 114, 115 is less than 2 s; the collection frequency of the electronic flow meters 120, 121 is 1 hz, and the collection accuracy is 0.01 ml.

[0043] Example

[0044] ①Drill a hole in the ground for sampling, and put the three groups of coal samples into the desorption tanks, ensuring the air tightness of the tanks;

[0045] ②Turn on the power supply of the measuring device, operate the control acquisition board 19, and adjust the temperature of each temperature regulator to 35℃, which is the reservoir temperature of the coal sample;

[0046] ③Control the control acquisition board 19 to control the opening of the automatic valve 17, and the coal sample desorption tank 14 starts desorption. Control the control acquisition board 19 to control the opening of the electromagnetic valve 110, and the pressure reducing valve 16 and the speed regulating valve 117 automatically adjust the pressure and gas flow in the pipeline. Control the control acquisition board 19 to collect and process the data of the electronic flowmeter 120. When the switching threshold is reached, control the control acquisition board 19 to control the closing of the electromagnetic valve 110 and the opening of the electromagnetic valve 111. The speed regulating valve 111 adjusts the gas flow in the pipeline. According to the flow value, control the control acquisition board 19 to collect and process the data of the electronic flowmeter 120 and the electronic flowmeter 121. When the gas flow in the pipeline is less than 5sccm for more than 2s, control the control acquisition board 19 to control the closing of the electromagnetic valve 111 within 2s, and the closing of the automatic valve 17, ending the desorption measurement of the coal sample desorption tank 14. Control the control acquisition board 19 to calculate the total desorption amount of this test, which is 91.91ml;

[0047] ④Control the control acquisition board 19 to control the opening of the automatic valve 18, and the coal sample desorption tank 15 starts desorption. Control the control acquisition board 19 to control the opening of the electromagnetic valve 112, and the pressure reducing valve 16 and the speed regulating valve 117 automatically adjust the pressure and gas flow in the pipeline. Control the control acquisition board 19 to collect and process the data of the electronic flowmeter 120. When the switching threshold is reached, control the control acquisition board 19 to control the closing of the electromagnetic valve 112 and the opening of the electromagnetic valve 113. The speed regulating valve 118 adjusts the gas flow in the pipeline. According to the flow value, control the control acquisition board 19 to collect and process the data of the electronic flowmeter 120 and the electronic flowmeter 121. When the gas flow in the pipeline is less than 5sccm for more than 2s, control the control acquisition board 19 to control the closing of the electromagnetic valve 113 within 2s, and the closing of the automatic valve 18, ending the desorption measurement of the coal sample desorption tank 15. Control the control acquisition board 19 to calculate the total desorption amount of this test, which is 95.21ml;

[0048] ⑤Control the acquisition board 19 to control open automatic valve Ⅲ 9, coal sample desorption tank Ⅲ 6 begins to desorb, control the acquisition board 19 to control electromagnetic valve Ⅴ 14 open, pressure reducing valve 16 and speed regulating valve Ⅰ 17 automatically adjust the pressure and gas flow in the pipeline, control the acquisition board 19 to collect and process the data of electronic flowmeter Ⅰ 20;After reaching the switching threshold, control the acquisition board 19 to control electromagnetic valve Ⅴ 14 close, electromagnetic valve Ⅵ 15 open, speed regulating valve Ⅱ 18 adjust the gas flow in the pipeline, according to the flow value control the acquisition board 19 to collect and process the data of electronic flowmeter Ⅰ 20 and electronic flowmeter Ⅱ 21, when the gas flow in the pipeline is less than 5sccm for more than 2s, control the acquisition board 19 to control electromagnetic valve Ⅵ 15 close within 2s, close automatic valve Ⅲ 9, end the desorption measurement of coal sample desorption tank Ⅲ 6, control the acquisition board 19 to calculate the total desorption amount 94.23ml of this test;

[0049] ⑥After the first measurement of each coal sample desorption tank, control the acquisition board 19 to control the measurement time interval to test each coal sample desorption tank alternately, control the acquisition board 19 to collect and record the single desorption amount, and calculate the cumulative desorption amount;

[0050] ⑦For coal sample desorption tank Ⅰ 4, according to the process of step ③, test 6 times at 10min intervals, get cumulative desorption amount 510.96ml, then test 4 times at 15min intervals, get cumulative desorption amount 783.47ml, then test 2 times at 30min intervals, get cumulative desorption amount 1032.88ml, then test 1 time at 60min intervals, get cumulative desorption amount 1244.44ml, finally test 2 times at 120min intervals, get cumulative desorption amount 1902.54ml;

[0051] ⑧For coal sample desorption tank Ⅱ 5, according to the process of step ④, test 6 times at 10min intervals, get cumulative desorption amount 490.86ml, then test 4 times at 15min intervals, get cumulative desorption amount 766.51ml, then test 2 times at 30min intervals, get cumulative desorption amount 997.62ml, then test 1 time at 60min intervals, get cumulative desorption amount 1178.49ml, finally test 2 times at 120min intervals, get cumulative desorption amount 1734.94ml;

[0052] ⑨For coal sample desorption tank Ⅲ 6, according to the process of step ⑤, test 6 times at 10min intervals, get cumulative desorption amount 502.55ml, then test 4 times at 15min intervals, get cumulative desorption amount 775.58ml, then test 2 times at 30min intervals, get cumulative desorption amount 1013.32ml, then test 1 time at 60min intervals, get cumulative desorption amount 1192.56ml, finally test 2 times at 120min intervals, get cumulative desorption amount 1874.78ml;

[0053] After each coal sample desorption tank is measured for 8 hours, the desorption amount data is measured once every 24 hours, and when the control collection board 19 identifies that the average desorption amount of each coal sample desorption tank for 7 consecutive days is not greater than 10 cm 3 , the natural desorption amount measurement is ended, the measured data is automatically analyzed and exported, and finally the cumulative desorption amount of the coal sample desorption tank I 4 is 3210.56 ml, the cumulative desorption amount of the coal sample desorption tank II 5 is 3024.78 ml, and the cumulative desorption amount of the coal sample desorption tank III 6 is 3182.49 ml.

Claims

1. An automated device for measuring the natural desorption of coalbed methane in multiple channels, comprising coal sample desorption tank I (4), coal sample desorption tank II (5), and coal sample desorption tank III (6), wherein the coal sample desorption tank I (4), coal sample desorption tank II (5), and coal sample desorption tank III (6) are respectively placed in temperature regulator I (1), temperature regulator II (2), and temperature regulator II (3); Its features are, The coal sample desorption tank I (4) is connected to one end of the automatic valve I (7) through a gas pipeline. The other end of the automatic valve I (7) is connected to one end of the solenoid valve I (10) and the solenoid valve II (11) through a gas pipeline. The other end of the solenoid valve I (10) is connected to the pressure reducing valve (16) through a gas pipeline and then connected to one end of the speed regulating valve I (17). The other end of the solenoid valve II (11) is connected to one end of the speed regulating valve II (18) through a gas pipeline. The other ends of the speed regulating valve I (17) and the speed regulating valve II (18) are both connected to one end of the control acquisition board (19). The other end of the control acquisition board (19) is connected to the exhaust port (22). The electronic flow meter I (20) and the electronic flow meter II (21) are placed inside the control acquisition board (19). Coal sample desorption tank II (5) is connected to one end of automatic valve II (8) through a gas pipeline. Coal sample desorption tank III (6) is connected to one end of automatic valve III (9) through a gas pipeline. The other end of automatic valve II (8) is connected to one end of solenoid valve III (12) and solenoid valve IV (13) through a gas pipeline. The other end of automatic valve III (9) is connected to one end of solenoid valve V (14) and solenoid valve VI (15) through a gas pipeline. The other end of solenoid valve III (12) and the other end of solenoid valve V (14) are both connected to the inlet pipeline of pressure reducing valve (16). The other end of solenoid valve IV (13) and the other end of solenoid valve VI (15) are both connected to the inlet pipeline of speed regulating valve II (18). Temperature regulator I (1), temperature regulator II (2), temperature regulator III (3), automatic valve I (7), automatic valve II (8), automatic valve III (9), solenoid valve I (10), solenoid valve II (11), solenoid valve III (12), solenoid valve IV (13), solenoid valve V (14), solenoid valve VI (15), pressure reducing valve (16), speed regulating valve I (17), speed regulating valve II (18), electronic flow meter I (20), and electronic flow meter II (21) are all connected to the control acquisition board (19) through electronic circuits; The control acquisition board (19) controls the opening of solenoid valve I (10), adjusts the pressure reducing valve (16) to limit the pressure in the gas pipeline to within the working pressure of the electronic flow meter (0-0.5MPa), adjusts the speed regulating valve I (17) to limit the gas flow in the pipeline to within the maximum range of 1000sccm of the electronic flow meter I (20), and the control acquisition board (19) collects and processes the data of the electronic flow meter I (20). When the control acquisition board (19) detects that the gas flow in the pipeline is lower than 150sccm for more than 2 seconds, it controls the closing of solenoid valve I (10) and the opening of solenoid valve II (11), adjusts the speed regulating valve II (18) to limit the gas flow in the pipeline to within 1000sccm, collects and processes the data of the electronic flow meter I (20), and when the gas flow in the pipeline decreases to 100sccm, it collects and processes the data of the electronic flow meter II (21). Similarly, the control acquisition board (19) controls the solenoid valve III (12) to open. When the control acquisition board (19) detects that the gas flow rate in the pipeline is lower than 150 sccm for more than 2 seconds, it controls the solenoid valve III (12) to close and the solenoid valve IV (13) to open. It adjusts the speed control valve II (18) to limit the gas flow rate in the pipeline to within 1000 sccm, collects and processes the data of the electronic flow meter I (20), and collects and processes the data of the electronic flow meter II (21) when the gas flow rate in the pipeline drops to 100 sccm. As above, the control acquisition board (19) controls the solenoid valve V (14) to open. When the control acquisition board (19) detects that the gas flow rate in the pipeline is lower than 150 sccm for more than 2 seconds, it controls the solenoid valve V (14) to close and the solenoid valve VI (15) to open. It adjusts the speed control valve II (18) to limit the gas flow rate in the pipeline to within 1000 sccm, collects and processes the data of the electronic flow meter I (20), and collects and processes the data of the electronic flow meter II (21) when the gas flow rate in the pipeline drops to 100 sccm.

2. The automated measuring device for multi-channel coalbed methane natural desorption according to claim 1, characterized in that, The coal sample desorption tanks I (4), II (5), and III (6) are all cylindrical, with a height of not less than 30 cm and a volume of not less than 1000 cm³. 3 It can maintain airtightness under a pressure of 0.5MPa.

3. The automated device for measuring the natural desorption capacity of multi-channel coalbed methane according to claim 2, characterized in that, The range of electronic flow meter I (20) is 0-1000 sccm and the working pressure is 0-0.5 MPa. The range of electronic flow meter II (21) is 0-100 sccm and the working pressure is 0-0.5 MPa.

4. The automated measuring device for multi-channel coalbed methane natural desorption according to claim 2, characterized in that, The temperature regulation range of temperature regulator I (1), temperature regulator II (2), and temperature regulator III (3) is 0-100℃.

5. The automated device for measuring the natural desorption capacity of multi-channel coalbed methane according to claim 2, characterized in that, The pressure reducing valve (16) has a range of 0-1.2 MPa.

6. A method for measuring the amount of natural desorption of coalbed methane using an automated measuring device according to claim 1, characterized in that, Includes the following steps: ① Drill holes for sampling during ground construction, and place the obtained coal samples into each coal sample desorption container, ensuring the airtightness of the coal sample desorption container; ② Turn on the power of the measuring device, operate the control acquisition board (19), and adjust the temperature of temperature regulator I (1), temperature regulator II (2), and temperature regulator III (3) to the reservoir temperature of the coal sample; ③ The control acquisition board (19) controls the opening of the automatic valve I (7), and the coal sample desorption tank I (4) begins desorption. The control acquisition board (19) controls the opening of the solenoid valve I (10), adjusts the pressure reducing valve (16) to limit the pressure in the gas pipeline to within the working pressure of the electronic flow meter (0-0.5MPa), adjusts the speed regulating valve I (17) to limit the gas flow in the pipeline to within the maximum range of the electronic flow meter I (20) (1000sccm), and the control acquisition board (19) collects and processes the data from the electronic flow meter I (20). The control acquisition board (19) monitors that the gas flow in the pipeline is below 150sccm. After m exceeds 2s, control solenoid valve I (10) to close and solenoid valve II (11) to open. Adjust speed control valve II (18) to limit the gas flow rate in the pipeline to within 1000 sccm. Collect and process the data of electronic flow meter I (20). When the gas flow rate in the pipeline decreases to 100 sccm, collect and process the data of electronic flow meter II (21). Control acquisition board (19) monitors that the gas flow rate in the pipeline is lower than 5 sccm for more than 2s. Control solenoid valve II (11) to close and close automatic valve I (7). End the desorption measurement of coal sample desorption tank I (4) and wait for subsequent tests. ④ The control acquisition board (19) controls the opening of the automatic valve II (8), and the coal sample desorption tank II (5) begins desorption. The control acquisition board (19) controls the opening of the solenoid valve III (12), adjusts the pressure reducing valve (16) to limit the pressure in the gas pipeline to within the working pressure of the electronic flow meter (0-0.5MPa), adjusts the speed regulating valve I (17) to limit the gas flow in the pipeline to within the maximum range of the electronic flow meter I (20) (1000sccm), and the control acquisition board (19) collects and processes the data from the electronic flow meter I (20). The control acquisition board (19) monitors that the gas flow in the pipeline is below 150sccm. After m exceeds 2s, control solenoid valve Ⅲ (12) to close and solenoid valve Ⅳ (13) to open, adjust speed control valve Ⅱ (18) to limit the gas flow rate in the pipeline to within 1000 sccm, collect and process the data of electronic flow meter Ⅰ (20), when the gas flow rate in the pipeline decreases to 100 sccm, collect and process the data of electronic flow meter Ⅱ (21); control acquisition board (19) monitors that the gas flow rate in the pipeline is lower than 5 sccm for more than 2s, control solenoid valve Ⅳ (13) to close, and close automatic valve Ⅱ (8), end the desorption amount measurement of coal sample desorption tank Ⅱ (5), and wait for subsequent tests; ⑤ The control acquisition board (19) controls the opening of the automatic valve Ⅲ (9), and the coal sample desorption tank Ⅲ (6) begins desorption. The control acquisition board (19) controls the opening of the solenoid valve Ⅴ (14), adjusts the pressure reducing valve (16) to limit the pressure in the gas pipeline to within the working pressure of the electronic flow meter (0-0.5MPa), adjusts the speed regulating valve Ⅰ (17) to limit the gas flow in the pipeline to within the maximum range of the electronic flow meter Ⅰ (20) (1000sccm), and the control acquisition board (19) collects and processes the data from the electronic flow meter Ⅰ (20). The control acquisition board (19) monitors that the gas flow in the pipeline is below 150sccm. After m exceeds 2s, control solenoid valve V (14) to close and solenoid valve VI (15) to open, adjust speed control valve II (18) to limit the gas flow rate in the pipeline to within 1000 sccm, collect and process the data of electronic flow meter I (20), when the gas flow rate in the pipeline decreases to 100 sccm, collect and process the data of electronic flow meter II (21); control acquisition board (19) monitors that the gas flow rate in the pipeline is lower than 5 sccm for more than 2s, control solenoid valve VI (15) to close, and close automatic valve III (9), end the desorption measurement of coal sample desorption tank III (6), and wait for subsequent tests; ⑥ Measure the desorption amount of coal sample in coal sample desorption tank Ⅰ (4) again according to step ③, measure the desorption amount of coal sample in coal sample desorption tank Ⅱ (5) again according to step ④, and measure the desorption amount of coal sample in coal sample desorption tank Ⅲ (6) again according to step ⑤. Control the coal sample desorption tank Ⅰ (4), coal sample desorption tank Ⅱ (5), and coal sample desorption tank Ⅲ (6) alternately by controlling the acquisition board (19) to achieve multi-channel testing; control the acquisition board (19) to control the measurement time interval, ensuring that each coal sample desorption tank is measured once within 5 minutes of the first filling, then measured 6 times at 10-minute intervals for 1 hour, then measured 4 times at 15-minute intervals for 1 hour, then measured 2 times at 30-minute intervals for 1 hour, then measured once at 60-minute intervals, and finally measured twice at 120-minute intervals, accumulating 8 hours of measurement. After continuous measurement for 8 hours, determine the desorption time interval according to the specific desorption flow rate, with a maximum of 24 hours. ⑦ Control the acquisition board (19) to identify the natural desorption amount of each coal sample in the desorption tank. The average desorption amount over 7 consecutive days is no more than 10 cm³. 3 Afterwards, the measurement ends, and the measurement data is automatically analyzed and exported.

7. The method for measuring the amount of natural desorption of coalbed methane using an automated multi-channel coalbed methane measuring device according to claim 6, characterized in that, Each single measurement time shall not exceed 2 min; the opening and closing switching time of automatic valve I (7), automatic valve II (8), automatic valve III (9), solenoid valve I (10), solenoid valve II (11), solenoid valve III (12), solenoid valve IV (13), solenoid valve V (14), and solenoid valve VI (15) shall be less than 2 s; the acquisition frequency of electronic flow meter I (20) and electronic flow meter II (21) shall be 1 Hz, and the acquisition accuracy shall be 0.01 ml.

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