CN205449727U - High-low temperature and high-pressure adsorption and desorption test device - Google Patents

Abstract

High low temperature high pressure adsorbs desorption test device, including gas charging system, the degasification system, adsorption system, desorption system, temperature control system and data acquisition system, gas charging system includes methane gas cell and helium gas cell, the degasification system includes the vacuum pump, vacuum vessel, the vacuometer, temperature control system includes high temperature unit and low temperature unit, adsorption system includes high temperature adsorption unit and cryosorption unit, desorption system includes gas drainage metering device, electronic balance and desorption gas flowmeter, data acquisition system includes computer and the control unit. The utility model discloses test operation is simple and convenient, experimental precision is high, can simulate the adsorption and desorption experiment under the different pressure of high temperature condition and low temperature condition respectively to realize the real-time accurate automatic acquisition of experimental data, for studying coal body gas adsorption and desorption law, provide more reliable data basis, take out to adopt and utilize to the high efficiency of gas and have important realistic meaning.

Description

High-low temperature and high-pressure adsorption and desorption test device

technical field

The utility model belongs to the technical field of gas adsorption and desorption test devices, in particular to a high-low temperature and high-pressure adsorption and desorption test device.

Background technique

Coalbed methane is produced in the coal-forming process and is mainly stored in the coal seam in the state of adsorption. With the increase of coal seam mining depth, the occurrence characteristics of microporosity, low permeability and high adsorption of gas-bearing coal seams are becoming more and more apparent. In the process of co-mining coal and gas, coal mine safety accidents and energy waste caused by difficult gas extraction plague the production of coal mines. Therefore, simulating the storage environment of deep coal seams, conducting adsorption and desorption experiments, and exploring the mechanism of gas adsorption in coal seams have important theoretical significance for the prevention and control of gas disasters in deep coal seams and the exploration and development of coal bed methane.

The gas content of coal seams is an important basic data for mine production and scientific research. The accuracy of its value is of great significance for the prediction of gas emission, gas geological evaluation, comprehensive control and comprehensive utilization of coal mine gas. However, in the process of measuring the gas content, the temperature of the coal sample is raised by drilling samples, and the rate of gas release in the coal core is accelerated, resulting in a low gas content measurement value. At present, the freezing sampling method has become a new technical approach for accurate determination of gas content. Therefore, the study of gas adsorption and desorption characteristics of coal in low temperature environment is particularly important. At the same time, the critical temperature of methane is -82.6°C and the critical pressure is 4.5MPa. Near the critical point, methane has strong compressibility, and increasing the pressure appropriately can make its density close to that of ordinary liquids. At this time, the properties of methane such as density, viscosity, solubility, heat capacity, and dielectric constant change drastically. Therefore, it is of great practical significance to study the phase change and adsorption and desorption characteristics of methane under this environmental condition for the efficient extraction and utilization of gas.

At present, the published patent documents "High-pressure isothermal adsorption test device for coal" (CN202502025U), "gas adsorption and desorption test device for coal samples under variable pressure conditions" (CN203705293U), "a gas adsorption and desorption test device" (CN103033442A), etc. , all adopt the heating method of water bath, and experiments under room temperature cannot be carried out; "A high-temperature and high-pressure adsorption and desorption device and its use method" (CN104062204A) adopts the heating method of constant temperature oil tank with silicone oil as the medium, and the experimental environment is harsh and the operation is complicated , the adsorption-desorption experiment at low temperature cannot be carried out. Moreover, the above-mentioned device has a low degree of automation, a small pressure range to withstand, insufficient airtightness, a small amount of experimental samples that can be carried out at the same time, and low experimental efficiency.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides a high-low temperature and high-pressure adsorption and desorption test device with simple test operation, high test precision, accurate test data, automatic data collection and high test efficiency.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions: a high-low temperature, high-pressure adsorption and desorption test device, including an inflation system, a degassing system, an adsorption system, a desorption system, a temperature control system and a data acquisition system;

The inflation system includes a methane inflation unit and a helium inflation unit. The methane inflation unit includes a high-pressure methane gas cylinder, a methane gas storage tank and the first five-way valve. The high-pressure methane gas cylinder and the methane gas storage tank are connected through a high-pressure pipe. The high-pressure pipe between the gas cylinder and the methane gas storage tank is provided with a first gas pressure reducing valve and a high-pressure gas booster pump in series along the flow direction of methane gas. The first five-way valve includes a first valve body, and the first valve body There are first interface, second interface, third interface, fourth interface and fifth interface on the valve body, five interface switches corresponding to the first to fifth interfaces are arranged on the valve body, and the methane gas storage tank passes through the high-pressure pipe It is connected with the fourth interface; the helium gas charging unit includes a high-pressure helium cylinder and a second gas decompression valve, the high-pressure helium cylinder is connected to the second interface through a high-pressure tube, and the second gas decompression valve is set between the high-pressure helium cylinder and the second gas decompression valve. On the high-pressure pipe between the two interfaces;

The degassing system includes a vacuum pump, a vacuum container, a vacuum gauge, and a second five-way valve. The second five-way valve includes a second valve body, and the second valve body is provided with a sixth interface, a seventh interface, an eighth interface, and a ninth interface. interface and the tenth interface, the second valve body is equipped with five interface switches corresponding to the sixth to tenth interfaces, the vacuum pump is connected to the vacuum container through the high pressure tube, the vacuum gauge is set on the vacuum container, and the vacuum container is connected to the vacuum container through the high pressure tube Connected to the third port, the first port of the first five-way valve is connected to the eighth port of the second five-way valve through a high-pressure pipe, the fifth port of the first five-way valve is connected to the ninth port of the second five-way valve through High pressure pipe connection;

The temperature control system includes a high-temperature unit and a low-temperature unit. The high-temperature unit includes a high-temperature constant temperature box and a first control panel arranged on the high-temperature constant temperature box. The first control panel is provided with a first temperature controller, a first power switch, a heating switch, The indicator light switch and the heater controlled by the heating switch; the low-temperature unit includes a low-temperature thermostat box and a second control panel arranged on the low-temperature thermostat box, and the second control panel is provided with a second temperature controller, a second power switch, a refrigeration switch and refrigeration unit controlled by the refrigeration switch;

The adsorption system includes a high-temperature adsorption unit and a low-temperature adsorption unit. The high-temperature adsorption unit includes a first gas buffer tank and several coal sample tanks arranged in a high-temperature constant temperature box. The first gas buffer tank and each coal sample tank are respectively arranged in parallel through connecting pipes. On the high-pressure pipe between the first port and the eighth port, a first pneumatic valve and a first pressure sensor are arranged in series along the gas flow direction on the high-pressure pipe between the first port and the eighth port, and the first gas buffer A first temperature sensor and a second pressure sensor are set on the tank, a second pneumatic valve is set on the connecting pipe connected to the first gas buffer tank, and a second temperature sensor and a third pressure sensor are respectively set on each coal sample tank , the connecting pipe connected to each coal sample tank is respectively provided with a third pneumatic valve;

The low-temperature adsorption unit includes a second gas buffer tank and several coal sample tanks arranged in a low-temperature thermostat, and the second gas buffer tank and each coal sample tank are respectively arranged in parallel between the fifth interface and the ninth interface through connecting pipes. On the high-pressure pipe, the fourth pneumatic valve and the fourth pressure sensor are arranged in series along the gas flow direction on the high-pressure pipe between the fifth interface and the ninth interface, and the third temperature sensor and the fifth pressure sensor are arranged on the second gas buffer tank. The pressure sensor, the connecting pipe connected to the second gas buffer tank is provided with the fifth pneumatic valve, the fourth temperature sensor and the sixth pressure sensor are respectively provided on each coal sample tank, the connecting pipe connected to each coal sample tank There are sixth pneumatic valves respectively;

The desorption system includes a gas drainage metering device, an electronic balance and a number of desorption gas flowmeters connected in parallel. The measuring ranges of each desorption gas flowmeter are different from each other. A seventh pneumatic valve is respectively arranged on the high-pressure pipe between the desorption gas flowmeter and the seventh interface;

The air drainage metering device includes a water storage container, a drain pipe and a water collection container. The upper end of the water storage container is connected to the sixth interface through a high-pressure pipe, and an eighth pneumatic valve is arranged on the high-pressure pipe between the water storage container and the sixth interface. One end of the pipe communicates with the bottom of the water storage container, the other end of the drain pipe communicates with the top of the water collection container, the water collection container is placed on an electronic balance, the tenth interface is connected with an emptying pipe, and the emptying pipe is provided with a ninth pneumatic valve.

The data acquisition system includes a computer and a control unit, the control unit includes a third control panel, and the third control panel is provided with a pressure inspection instrument, a temperature inspection instrument, a flowmeter display, and a low temperature thermostat switch for controlling the second power switch , a high-temperature thermostat switch for controlling the first power switch, and a third power switch for controlling the pressure inspection instrument and the temperature inspection instrument, and the computer controls and connects the first gas pressure reducing valve, the second gas pressure reducing valve, The first five-way valve, the second five-way valve and the first to ninth pneumatic valves.

There are five coal sample tanks in the high-temperature adsorption unit, which are the first coal sample tank, the second coal sample tank, the third coal sample tank, the fourth coal sample tank and the fifth coal sample tank. There are five coal sample tanks, namely the sixth coal sample tank, the seventh coal sample tank, the eighth coal sample tank, the ninth coal sample tank and the tenth coal sample tank.

There are three desorption gas flowmeters in the desorption system, which are the first desorption gas flowmeter, the second desorption gas flowmeter and the third desorption gas flowmeter, and the range of the first desorption gas flowmeter is 0-2000ml/min , the measuring range of the second desorption gas flowmeter is 0-500ml/min, the measuring range of the third desorption gas flowmeter is 0-100ml/min; the flowmeter displays are three, which are respectively connected with the first desorption gas flowmeter, The first flow meter display, the second flow meter display, and the third flow meter display corresponding to the second desorption gas flow meter and the third desorption gas flow meter.

By adopting the above technical scheme, the utility model has the following advantages:

1. The high-low temperature and high-pressure adsorption and desorption test device of the present invention includes an inflation system, a degassing system, an adsorption system, a desorption system, a temperature control system and a data acquisition system. The inflation system includes a methane inflation unit and a helium inflation unit, and the methane inflation unit Use the high-pressure methane gas cylinder to first depressurize through the first gas pressure reducing valve, then adjust the methane gas pressure to the pressure required for the test through the high-pressure gas booster pump, and fill the methane gas with the set pressure value into the methane storage tank. In the gas tank, the methane gas storage tank provides methane gas with a predetermined pressure value to the adsorption system. The helium gas charging unit uses a high-pressure helium cylinder to be decompressed by the second gas pressure reducing valve and then passed into the adsorption system for calibration. The free space volume of each coal sample tank; the degassing system uses a vacuum pump to degas the adsorption system to ensure that only methane gas participates in the test during the test, thereby eliminating the interference of other gases on the test results; the temperature control system uses a high temperature unit Combining the high temperature adsorption unit in the adsorption system to simulate the methane adsorption and desorption test in the high temperature environment, and using the low temperature unit combined with the low temperature adsorption unit in the adsorption system to simulate the methane adsorption and desorption test in the low temperature environment;

2. The desorption system of this utility model adopts three desorption gas flowmeters and gas drainage metering devices with different ranges. In the initial stage of the desorption test, the first desorption gas flowmeter is used for measurement. The desorption gas flow meter, the third desorption gas flow meter and the gas drainage metering device are used for measurement. During the whole desorption test process, the computer automatically controls the interface switching according to the desorption gas flow rate, and automatically collects data in real time, which effectively improves the test performance. Accuracy, and reduce the difficulty of operation, the test operation is simple, effectively improve the test efficiency;

3. The high-low temperature and high-pressure adsorption and desorption test device of the present invention adopts a low-temperature unit to provide a low-temperature environment of -100°C, which provides test conditions for studying the adsorption and desorption characteristics of methane in a low-temperature environment and simulating the supercritical adsorption of methane;

Description of drawings

Fig. 1 is a structural representation of the utility model.

detailed description

As shown in Figure 1, the high-low temperature and high-pressure adsorption and desorption test device of the present invention includes an inflation system, a degassing system, an adsorption system, a desorption system, a temperature control system and a data acquisition system.

The charging system includes a methane charging unit and a helium charging unit. The methane charging unit includes a high-pressure methane gas cylinder 1, a methane gas storage tank 2 and the first five-way valve. 3 connected, the high-pressure pipe 3 between the high-pressure methane gas cylinder 1 and the methane gas storage tank 2 is sequentially provided with a first gas pressure reducing valve 4 and a high-pressure gas booster pump 5 in series along the flow direction of methane gas, and the first five-way valve Including the first valve body 6, the first valve body 6 is provided with a first port 7, a second port 8, a third port 9, a fourth port 10 and a fifth port 11, and the first valve body 6 is provided with a The five interface switches corresponding to the first to fifth interfaces 7, 8, 9, 10, and 11 (the five-way valve is an existing conventional component, and its specific structure will not be described in detail), the methane gas storage tank 2 is connected with the high-pressure pipe 3 The fourth interface 10 is connected; the helium gas charging unit includes a high-pressure helium cylinder 12 and a second gas decompression valve 13, the high-pressure helium cylinder 12 is connected with the second interface 8 through a high-pressure pipe 3, and the second gas decompression valve 13 is arranged on On the high-pressure pipe 3 between the high-pressure helium cylinder 12 and the second interface 8 .

The degassing system includes a vacuum pump 14, a vacuum container 15, a vacuum gauge 16 and a second five-way valve, the second five-way valve includes a second valve body 17, and the second valve body 17 is provided with a sixth port 18 and a seventh port 19 , the eighth interface 20, the ninth interface 21 and the tenth interface 22, the second valve body 17 is provided with five interface switches corresponding to the sixth to tenth interfaces 18, 19, 20, 21, 22,

The vacuum pump 14 is connected to the vacuum container 15 through the high-pressure pipe 3, the vacuum gauge 16 is arranged on the vacuum container 15, the vacuum container 15 is connected to the third port 9 through the high-pressure pipe 3, and the first port 7 of the first five-way valve is connected to the second five-way valve. The eighth port 20 of the one-way valve is connected through the high-pressure pipe 3 , and the fifth port 11 of the first five-way valve is connected with the ninth port 21 of the second five-way valve through the high-pressure pipe 3 .

The temperature control system includes a high-temperature unit and a low-temperature unit. The high-temperature unit includes a high-temperature thermostat box 23 and a first control panel 24 arranged on the high-temperature thermostat box 23. The first control panel 24 is provided with a first temperature controller 25 and a first power supply. Switch 26, heating switch 27, pilot lamp switch 28 and the heater controlled by heating switch 27; There is a second temperature controller 31, a second power switch 32, a refrigeration switch 33 and a refrigeration unit controlled by the refrigeration switch 33; each part in the high-temperature unit and the low-temperature unit is an existing conventional technology, and the heater and the refrigeration unit are not shown in the figure . The temperature setting range of the high temperature constant temperature box 23 is 20°C to 80°C. The front of the high temperature constant temperature box 23 is designed with a rotary single door with an observation window. The working room is equipped with a ray lamp. The outer surface of the box is sprayed with plastic, and the inner surface is made of stainless steel. , the circulation mode is hot air convection circulation, and the first temperature controller 25 is used to adjust the temperature to provide the required constant temperature environment for the test; the low-temperature constant temperature box 29 is refrigerated by a three-stage automatic cascade cycle refrigeration unit, which can provide -100 ° C to 20 In the test environment of ℃, the outer surface of the box is sprayed with plastic, the inner surface is made of stainless steel, the inner four walls are equipped with refrigeration evaporators, and the inner ladder bracket is used to place the low-temperature adsorption chamber.

The adsorption system includes a high-temperature adsorption unit and a low-temperature adsorption unit. The high-temperature adsorption unit includes a first gas buffer tank 34 and several coal sample tanks arranged in the high-temperature constant temperature box 23. The first gas buffer tank 34 and each coal sample tank are respectively connected by The pipe 83 is arranged in parallel on the high-pressure pipe 3 between the first port 7 and the eighth port 20, and the first pneumatic valve is arranged in series on the high-pressure pipe 3 between the first port 7 and the eighth port 20 along the gas flow direction. 35 and the first pressure sensor 36, the first gas buffer tank 34 is provided with the first temperature sensor 37 and the second pressure sensor 38, the connecting pipe 83 connected on the first gas buffer tank 34 is provided with the second pneumatic valve 39, Each coal sample tank is respectively provided with a second temperature sensor 40 and a third pressure sensor 41 , and the connecting pipe 83 connected to each coal sample tank is respectively provided with a third pneumatic valve 42 .

The low-temperature adsorption unit includes a second gas buffer tank 43 and several coal sample tanks arranged in the low-temperature thermostat 29, and the second gas buffer tank 43 and each coal sample tank are arranged in parallel at the fifth interface 11 and the second gas sample tank through connecting pipes 83 respectively. On the high-pressure pipe 3 between the nine ports 21, on the high-pressure pipe 3 between the fifth port 11 and the ninth port 21, a fourth pneumatic valve 44 and a fourth pressure sensor 45 are arranged in series along the direction of gas flow, and the second gas The buffer tank 43 is provided with a third temperature sensor 46 and a fifth pressure sensor 47, the connecting pipe 83 connected to the second gas buffer tank 43 is provided with a fifth pneumatic valve 48, and each coal sample tank is respectively provided with a fourth The temperature sensor 49 and the sixth pressure sensor 50 are respectively provided with a sixth pneumatic valve 51 on the connecting pipe 83 connected to each coal sample tank.

The desorption system includes a gas drainage metering device, an electronic balance 52 and several desorption gas flowmeters connected in parallel. The measuring ranges of each desorption gas flowmeter are different from each other, and each desorption gas flowmeter is connected to the seventh interface 19 through a high-pressure pipe 3 respectively. The high-pressure pipe 3 between each desorption gas flow meter and the seventh interface 19 is respectively provided with a seventh pneumatic valve 53 .

The gas drainage metering device includes a water storage container 54, a drain pipe 55 and a water collection container 56. The upper end of the water storage container 54 is connected to the sixth interface 18 through a high-pressure pipe 3, and the high-pressure pipe 3 between the water storage container 54 and the sixth interface 18 An eighth pneumatic valve 57 is provided on the top, one end of the drain pipe 55 communicates with the bottom of the water storage container 54, and the other end of the drain pipe 55 communicates with the top of the water collection container 56, the water collection container 56 is placed on the electronic balance 52, and the tenth interface 22 An emptying pipe 58 is connected, and a ninth pneumatic valve 59 is arranged on the emptying pipe 58 .

Data acquisition system comprises computer 60 and control unit, and control unit comprises the 3rd control panel 61, is provided with pressure patrol instrument 62, temperature patrol instrument 63, flowmeter display, is used to control the second power switch on the 3rd control panel 61. 32 low temperature thermostat switch 64, the high temperature thermostat switch 65 for controlling the first power switch 26, and the third power switch 66 for controlling the pressure patrol instrument 62 and the temperature patrol instrument 63, and the computer control connects the first Gas pressure reducing valve 4, second gas pressure reducing valve 13, first five-way valve, second five-way valve and first to ninth pneumatic valves 35, 39, 42, 44, 48, 51, 53, 57, 59 . The computer 60 adopts DelPhi programming, which has the functions of gas parameter conversion and data analysis. The working process of the instrument is displayed on the interface, which can realize man-machine dialogue. Process and generate raw data reports, analysis reports and graphs.

The methane gas filled in the high-pressure methane gas cylinder 1 is commercially available methane standard gas with a volume of 40L/bottle and a purity of ≥99.99%. The helium gas filled in the high-pressure helium gas cylinder 12 is commercially available standard helium gas with a pressure of 15MPa , the volume is 40L/bottle, and the pressure resistance value of the high-pressure pipe 3 is above 50MPa.

There are five coal sample tanks in the high temperature adsorption unit, namely the first coal sample tank 67, the second coal sample tank 68, the third coal sample tank 69, the fourth coal sample tank 70 and the fifth coal sample tank 71, There are five coal sample tanks in the low temperature adsorption unit, namely the sixth coal sample tank 72 , the seventh coal sample tank 73 , the eighth coal sample tank 74 , the ninth coal sample tank 75 and the tenth coal sample tank 76 .

There are three desorption gas flow meters in the desorption system, which are respectively the first desorption gas flow meter 77, the second desorption gas flow meter 78 and the third desorption gas flow meter 79, and the range of the first desorption gas flow meter 77 is 0 -2000ml/min, the measuring range of the second desorption gas flow meter 78 is 0-500ml/min, the measuring range of the third desorption gas flow meter 79 is 0-100ml/min; A desorption gas flowmeter 77 , a second desorption gas flowmeter 78 , and a third desorption gas flowmeter 79 correspond to a first flowmeter display 80 , a second flowmeter display 81 , and a third flowmeter display 82 .

Wherein, vacuum pump 14, vacuum container 15, vacuum gauge 16, high-pressure gas booster pump 5, gas decompression valve, pneumatic valve, five-way valve, temperature sensor, pressure sensor, high temperature thermostat 23, low temperature thermostat 29 and desorbing gas The volume flowmeter and the like are existing conventional technologies in the art, and its specific structure will not be described in detail.

The test method of the high-low temperature and high-pressure adsorption-desorption test device includes the following steps in sequence:

(1) Drill massive fresh coal samples on the underground mining face, seal them tightly and send them to the ground laboratory, crush and sieve the fresh coal samples into different particle sizes, and select coal samples with corresponding particle sizes for industrial analysis, Determination of parameters such as true density and apparent density;

(2) Check the test device to ensure that the test device is connected reliably, open the second gas pressure reducing valve 13, the first port 7, the second port 8, the fifth port 11, the first pneumatic valve 35, the second pneumatic valve 39, the third The pneumatic valve 42, the fourth pneumatic valve 44, the fifth pneumatic valve 48 and the sixth pneumatic valve 51 fill helium into the first gas buffer tank 34, the second gas buffer tank 43 and the first to tenth coal sample tanks 67 , 68, 69, 70, 71, 72, 73, 74, 75, 76, check the airtightness of the test device to ensure that the airtightness of the test device is good, then close all gas pressure reducing valves, pneumatic valves and interfaces; open the first Interface 7, third interface 9 and fifth interface 11, open the first pneumatic valve 35, the second pneumatic valve 39, the third pneumatic valve 42, the fourth pneumatic valve 44, the fifth pneumatic valve 48 and the sixth pneumatic valve 51, Start the vacuum pump 14 to degas the high-temperature adsorption unit and the low-temperature adsorption unit until the pressure of the vacuum gauge 16 shows below 20 Pa for more than three hours, then close the vacuum pump 14 and all gas pressure reducing valves, pneumatic valves and interfaces, and place the electronic balance 52 At the emptying pipe 58 place, the water collecting container 56 is placed on the electronic balance 52 and injected with water, the outlet end of the emptying pipe 58 is stretched below the water collecting container 56 water surface, and the indication g _of the electronic balance 52 is recorded. , open the eighth interface 20 and the tenth interface 22, open the ninth pneumatic valve 59, the water in the water collection container 56 flows into and fills the high-pressure pipe 3 between the first pneumatic valve 35 and the eighth interface 20, and records the electronic balance The volume of water corresponding to the difference between g ₂ and _{g 2 of} 52 is the volume of the high-pressure pipe 3 between the first pneumatic valve 35 and the eighth interface 20. Open the second pneumatic valve 39 and The third pneumatic valve 42 on the first to fifth coal sample tanks 67, 68, 69, 70, 71, after opening the corresponding pneumatic valve each time, after the indication of the electronic balance 52 is stable, record the indication of the electronic balance 52 at this time. Count and close the pneumatic valve, respectively measure the quality of the inflow water, obtain the volume of the first gas buffer tank 34 and the first to fifth coal sample tanks 67, 68, 69, 70, 71, close all interfaces and pneumatic valves , then open the ninth interface 21 and the tenth interface 22, open the ninth pneumatic valve 59, the water in the water collection container 56 flows into and fills the high-pressure pipe 3 between the fourth pneumatic valve 44 and the ninth interface 21, and records the electronic The indication of the balance 52 calculates the volume of the high-pressure pipe 3 between the fourth pneumatic valve 44 and the ninth interface 21, and then opens the fifth pneumatic valve 48 and the sixth to tenth coal sample tanks 72, 73, 74, For the sixth pneumatic valve 51 on 75 and 76, after opening the corresponding pneumatic valve each time, after the indication of the electronic balance 52 is stable, record the indication of the electronic balance 52 at this time and close the pneumatic valve to measure the quality of the inflow water respectively , draw the volume of the second gas buffer tank 43 and the sixth to tenth coal sample tanks 72, 73, 74, 75, 76;

(3) Fill coal samples in the first to tenth coal sample tanks 67, 68, 69, 70, 71, 72, 73, 74, 75, and 76, and control the heater to set high temperature and constant temperature through the first temperature controller 25 The test temperature in the box 23 is controlled by the second temperature controller 31 to control the test temperature in the low-temperature constant temperature box 29. The temperature setting range of the high-temperature constant temperature box 23 is 20°C to 80°C, and the temperature setting range of the low-temperature constant temperature box 29 is -100°C to 20°C, open the first port 7, the third port 9, and the fifth port 11, open the first to sixth pneumatic valves 35, 39, 42, 44, 48, and 51, and close the remaining ports and pneumatic valves, Start the vacuum pump 14 to degas the high-temperature adsorption unit and the low-temperature adsorption unit until the pressure of the vacuum gauge 16 shows below 20 Pa and keep it for more than three hours, then close the vacuum pump 14 and all pneumatic valves and interfaces, open the first interface 7 and the second Interface 8, open the first pneumatic valve 35, open the high-pressure helium cylinder 12, the high-pressure helium gas enters the high-pressure pipe 3 of the high-temperature adsorption unit after being decompressed by the second gas pressure reducing valve 13, and waits for the first pressure sensor 36 to display the number After stabilization, close the first pneumatic valve 35, open the third pneumatic valve 42 on the first to fifth coal sample tanks 67, 68, 69, 70, 71 in turn, and wait for the corresponding coal sample to When the third pressure sensor 41 indication on the tank was consistent with the indication of the first pressure sensor 36, the third pneumatic valve 42 on the coal sample tank was closed and the third pressure sensor 41 on the coal sample tank was recorded. display, and open the first pneumatic valve 35 again, open the high-pressure helium cylinder 12, the high-pressure helium enters the high-pressure pipe 3 of the high-temperature adsorption unit after being decompressed by the second gas decompression valve 13, and waits for the first pressure sensor 36 After the reading is stable, close the first pneumatic valve 35 to obtain the free space volumes of the first to fifth coal sample tanks 67, 68, 69, 70, 71; close the first interface 7, open the fifth interface 11, open The fourth pneumatic valve 44 opens the high-pressure helium cylinder 12, and the high-pressure helium gas enters the high-pressure pipe 3 of the low-temperature adsorption unit after being decompressed by the second gas decompression valve 13, and is closed after the reading of the fourth pressure sensor 45 is stable. The fourth pneumatic valve 44 opens the sixth pneumatic valve 51 on the sixth to tenth coal sample tanks 72, 73, 74, 75, 76 in turn, and waits until the sixth pneumatic valve 51 on the corresponding coal sample tank is opened each time. When the readings of the six pressure sensors 50 were consistent with the readings of the fourth pressure sensor 45, the sixth pneumatic valve 51 on the coal sample tank was closed and the readings of the sixth pressure sensor 50 on the coal sample tank were recorded, and Open the fourth pneumatic valve 44 again, open the high-pressure helium cylinder 12, and the high-pressure helium gas enters the high-pressure pipe 3 of the low-temperature adsorption unit after being decompressed by the second gas pressure reducing valve 13, and after the fourth pressure sensor 45 shows a stable value , close the fourth pneumatic valve 44, thereby obtain the free space volume of the sixth to tenth coal sample tanks 72, 73, 74, 75, 76, close all pneumatic valves and interfaces;

(4) Open the first interface 7, the third interface 9 and the fifth interface 11, open the first pneumatic valve 35, the third pneumatic valve 42, the fourth pneumatic valve 44 and the sixth pneumatic valve 51, and start the vacuum pump 14 for high temperature adsorption The unit and the low-temperature adsorption unit are degassed until the pressure of the vacuum gauge 16 shows below 20 Pa and kept for more than three hours, then close the vacuum pump 14 and all pneumatic valves and interfaces, open the high-pressure methane cylinder 1, and the high-pressure methane gas passes through the first gas After decompression treatment by the pressure reducing valve 4, it is pressurized by the high-pressure gas booster pump 5 to the predetermined adsorption pressure value determined by the test personnel before the test and stored in the methane gas storage tank 2, and the first interface 7 and the fourth interface 10 are opened. Open the first pneumatic valve 35 and the second pneumatic valve 39, fill the methane gas with predetermined adsorption pressure value into the first gas buffer tank 34 and the high-pressure pipe 3 connected thereto, wait for the first pressure sensor 36 and the second pressure sensor 38 After the readings of the first pressure sensor 36 are stabilized, close the first pneumatic valve 35 and the second pneumatic valve 39, then record the readings of the first pressure sensor 36 at this time, and open the first to fifth coal sample tanks 67, 68, 69, 70 successively , 71 on the third pneumatic valve 42, each time after opening a third pneumatic valve 42, after the third pressure sensor 41 indication on the corresponding coal sample tank is relatively stable with the indication of the first pressure sensor 36, close the coal The third pneumatic valve 42 on the sample tank, and record the indication of the third pressure sensor 41 on the coal sample tank at this time and close the third pneumatic valve 42, keep it for seven hours, so that the coal sample is fully adsorbed to reach equilibrium, Record the reading of the third pressure sensor 41 on the coal sample tank at this time, and open the second pneumatic valve 39, after the readings of the first pressure sensor 36 and the second pressure sensor 38 are stable, close the second pneumatic valve 39 , so as to calculate respectively the methane gas volume and the methane gas volume in the free state charged into the first to fifth coal sample tanks 67, 68, 69, 70, 71, and finally obtain the first to fifth coal sample tanks 67, 68, 69, 70, 71 the volume of adsorbed methane gas; close the first port 7, open the fifth port 11, open the fourth pneumatic valve 44 and the fifth pneumatic valve 48, and fill the methane gas with predetermined adsorption pressure value into the second In the gas buffer tank 43 and the high-pressure pipe 3 connected thereto, after the indications of the fourth pressure sensor 45 and the fifth pressure sensor 47 are stable, close the fourth pneumatic valve 44 and the fifth pneumatic valve 48, and then record the first The readings of the four pressure sensors 45, open the sixth pneumatic valve 51 on the sixth to tenth coal sample tanks 72, 73, 74, 75, 76 in turn, and wait for the corresponding coal sample tank after opening a sixth pneumatic valve 51 at a time. After the reading of the sixth pressure sensor 50 and the reading of the fourth pressure sensor 45 are relatively stable, close the sixth pneumatic valve 51 on the coal sample tank, and record the sixth pressure sensor 50 on the coal sample tank at this time. and close the sixth pneumatic valve 51, keep it for seven hours, so that the coal sample is fully adsorbed to reach equilibrium, record the reading of the sixth pressure sensor 50 on the coal sample tank at this time, and open the fifth pneumatic valve 48 , to be the fourth pressure sensor 45 and the sixth pressure sensor After the indication of device 50 is stable, close the fifth pneumatic valve 48, thereby calculate respectively the methane gas volume and the methane gas under the free state filled in the sixth to tenth coal sample tanks 72, 73, 74, 75, 76 volume, and finally obtain the volume of adsorbed methane gas in the sixth to tenth coal sample tanks 72, 73, 74, 75, and 76, and close all pneumatic valves and interfaces;

(5) Steps (3) and (4) are methods for measuring the volume of adsorbed methane gas. Before using this method to measure the volume of adsorbed methane gas, the tester shall determine the first gas buffer tank in the high-temperature adsorption unit and the low-temperature adsorption unit in this method. 34 and the N predetermined adsorption pressure values of the second gas buffer tank 43, where N is a positive integer less than 10, use the method of measuring the volume of adsorbed methane gas to carry out N times of steps (3) and (4), at the lowest predetermined adsorption pressure Under the condition of the above value, the method for measuring the volume of adsorbed methane gas is used to obtain the volume of methane gas adsorbed in the first to tenth coal sample tanks 67, 68, 69, 70, 71, 72, 73, 74, 75, and 76 , then the pressure value of the first gas buffer tank 34 and the second gas buffer tank 43 is increased to the next predetermined adsorption pressure value by the high-pressure gas booster pump 5; under the condition of the next predetermined adsorption pressure value, step (3) is carried out again ) and step (4), until N times of steps (3) and (4) are completed, the first to tenth coal sample tanks 67, 68, 69, 70, 71 under N predetermined adsorption pressure values are obtained , 72, 73, 74, 75, 76 the volume of methane gas adsorbed;

(6) Open the first interface 7, the third interface 9 and the fifth interface 11, open the first pneumatic valve 35, the third pneumatic valve 42, the fourth pneumatic valve 44 and the sixth pneumatic valve 51, and start the vacuum pump 14 for high temperature adsorption The unit and the low-temperature adsorption unit are degassed until the pressure of the vacuum gauge 16 shows below 20 Pa and kept for more than three hours, then close the vacuum pump 14 and all pneumatic valves and interfaces, open the high-pressure methane cylinder 1, and the high-pressure methane gas passes through the first gas After the decompression treatment by the pressure reducing valve 4, it is pressurized by the high-pressure gas booster pump 5 to the predetermined desorption pressure value determined by the test personnel before the test and stored in the methane gas storage tank 2, and the first interface 7 and the fourth interface 10 are opened. Open the first pneumatic valve 35 and the second pneumatic valve 39, fill the methane gas with the predetermined desorption pressure value into the first gas buffer tank 34 and the high-pressure pipe 3 connected thereto, wait for the first pressure sensor 36 and the second pressure sensor 38 After the readings of the first pressure sensor 36 are stabilized, close the first pneumatic valve 35 and the second pneumatic valve 39, then record the readings of the first pressure sensor 36 at this time, and open the first to fifth coal sample tanks 67, 68, 69, 70 successively , 71 on the third pneumatic valve 42, each time after opening a third pneumatic valve 42, after the third pressure sensor 41 indication on the corresponding coal sample tank is relatively stable with the indication of the first pressure sensor 36, close the coal The third pneumatic valve 42 on the sample tank, and record the indication of the third pressure sensor 41 on the coal sample tank at this time and close the third pneumatic valve 42, keep it for seven hours, so that the coal sample is fully adsorbed to reach equilibrium, Record the reading of the third pressure sensor 41 on the coal sample tank at this time, and open the second pneumatic valve 39, after the readings of the first pressure sensor 36 and the second pressure sensor 38 are stable, close the second pneumatic valve 39 , so as to calculate respectively the methane gas volume and the methane gas volume in the free state charged into the first to fifth coal sample tanks 67, 68, 69, 70, 71, and finally obtain the first to fifth coal sample tanks 67, 68, 69, 70, 71 the volume of adsorbed methane gas; close the first port 7, open the fifth port 11, open the fourth pneumatic valve 44 and the fifth pneumatic valve 48, and fill the methane gas with a predetermined desorption pressure value into the second In the gas buffer tank 43 and the high-pressure pipe 3 connected thereto, after the indications of the fourth pressure sensor 45 and the fifth pressure sensor 47 are stable, close the fourth pneumatic valve 44 and the fifth pneumatic valve 48, and then record the first The readings of the four pressure sensors 45, open the sixth pneumatic valve 51 on the sixth to tenth coal sample tanks 72, 73, 74, 75, 76 in turn, and wait for the corresponding coal sample tank after opening a sixth pneumatic valve 51 at a time. After the reading of the sixth pressure sensor 50 and the reading of the fourth pressure sensor 45 are relatively stable, close the sixth pneumatic valve 51 on the coal sample tank, and record the sixth pressure sensor 50 on the coal sample tank at this time. and close the sixth pneumatic valve 51, keep it for seven hours, so that the coal sample is fully adsorbed to reach equilibrium, record the reading of the sixth pressure sensor 50 on the coal sample tank at this time, and open the fifth pneumatic valve 48 , to be the fourth pressure sensor 45 and the sixth pressure sensor After the indication of device 50 is stable, close the fifth pneumatic valve 48, thereby calculate respectively the methane gas volume and the methane gas under the free state filled in the sixth to tenth coal sample tanks 72, 73, 74, 75, 76 Finally, the volume of adsorbed methane gas in the sixth to tenth coal sample tanks 72, 73, 74, 75, and 76 is obtained. Close all pneumatic valves and interfaces. After the coal sample reaches adsorption equilibrium, open the sixth interface 18 and the seventh interface. 19. The eighth interface 20, the tenth interface 22, and the ninth pneumatic valve 59 open the third pneumatic valve 42 on the first to fifth coal sample tanks 67, 68, 69, 70, and 71 in sequence, respectively for the first to fifth coal sample tanks. The methane gas in the free state in the fifth coal sample tank 67, 68, 69, 70, 71 is evacuated, and the third pressure sensor 41 on the corresponding coal sample tank is displayed after opening a third pneumatic valve 42 each time. At zero o'clock, close the ninth pneumatic valve 59, and adopt the computer 60 to automatically control the seventh pneumatic valve 53 and the eighth pneumatic valve on the first desorption gas flow meter 77, the second desorption gas flow meter 78, and the third desorption gas flow meter 79 57, first select the first desorption gas flow meter 77, when the methane gas flow rate is greater than 450ml/min, the computer 60 controls the seventh pneumatic valve 53 on the first desorption gas flow meter 77 to open, and the first desorption gas flow meter 77 Measure the desorbed methane gas volume, when the methane gas flow rate is between 80ml/min-450ml/min, the computer 60 opens the seventh pneumatic valve 53 on the second desorbed gas flowmeter 78, and passes the second desorbed gas flow rate Meter 78 measures the desorbed methane gas volume, and when the methane gas flow rate is between 20ml/min-80ml/min, the computer 60 opens the seventh pneumatic valve 53 on the third desorbed gas flowmeter 79, through the third desorbed The gas flow meter 79 measures the desorbed methane gas volume, and when the methane gas flow rate is less than 20ml/min, the computer 60 opens the eighth pneumatic valve 57, and measures the desorbed methane gas volume through the gas drainage metering device, thereby measuring the first The methane gas volume desorbed in the first to fifth coal sample tanks 67, 68, 69, 70, 71; then close the eighth interface 20, open the ninth interface 21 and the ninth pneumatic valve 59, and open the sixth to tenth in turn The sixth pneumatic valve 51 on the coal sample tanks 72, 73, 74, 75, 76 empties the methane gas in the free state in the sixth to tenth coal sample tanks 72, 73, 74, 75, 76 respectively, After opening a sixth pneumatic valve 51 at a time, when the sixth pressure sensor 50 on the corresponding coal sample tank shows zero, close the ninth pneumatic valve 59, and adopt computer 60 to automatically control the first desorption gas flowmeter 77, the second The seventh pneumatic valve 53 and the eighth pneumatic valve 57 on the desorption gas flow meter 78, the third desorption gas flow meter 79 pass through the first desorption gas flow meter 77, the second desorption gas flow meter 78, the third desorption gas flow meter 79 and gas drainage metering device, measuring the sixth to tenth coal sample tanks 72, 73, 74, 75, 76 The volume of methane gas desorbed inside, the computer 60 collects instantaneous flow and cumulative flow in real time during the whole desorption process, and generates data reports and curves;

(7) Step (6) is a method for measuring the volume of desorbed methane gas. Before using this method to measure the volume of desorbed methane gas, the tester determines the first gas buffer tank 34 and the second gas buffer tank 34 in the high-temperature adsorption unit and the low-temperature adsorption unit in this method. N predetermined desorption pressure values of the buffer tank 43, where N is a positive integer less than 10, use the desorption methane gas volume measurement method to perform N times of step (6), and use the desorption methane gas volume measurement method under the lowest predetermined desorption pressure value The volume measurement method is operated to obtain the methane gas volume desorbed in the first to tenth coal sample tanks 67, 68, 69, 70, 71, 72, 73, 74, 75, and 76, and then through the high-pressure gas booster pump 5 Increase the pressure value of the first gas buffer tank 34 and the second gas buffer tank 43 to the next predetermined desorption pressure value; repeat step (6) under the condition of the next predetermined desorption pressure value until N times of step (6) After the operation is completed, the methane gas volumes adsorbed in the first to tenth coal sample tanks 67, 68, 69, 70, 71, 72, 73, 74, 75, 76 under N predetermined desorption pressure values are obtained.

This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model belong to the technology of the utility model. protection scope of the program.

Claims (4)

1. The high-low temperature and high-pressure adsorption and desorption test device is characterized in that it includes an inflation system, a degassing system, an adsorption system, a desorption system, a temperature control system and a data acquisition system; The inflation system includes a methane inflation unit and a helium inflation unit. The methane inflation unit includes a high-pressure methane gas cylinder, a methane gas storage tank and the first five-way valve. The high-pressure methane gas cylinder and the methane gas storage tank are connected through a high-pressure pipe. The high-pressure pipe between the gas cylinder and the methane gas storage tank is provided with a first gas pressure reducing valve and a high-pressure gas booster pump in series along the flow direction of methane gas. The first five-way valve includes a first valve body, and the first valve body There are first interface, second interface, third interface, fourth interface and fifth interface on the valve body, five interface switches corresponding to the first to fifth interfaces are arranged on the valve body, and the methane gas storage tank passes through the high-pressure pipe It is connected with the fourth interface; the helium gas charging unit includes a high-pressure helium cylinder and a second gas decompression valve, the high-pressure helium cylinder is connected to the second interface through a high-pressure tube, and the second gas decompression valve is set between the high-pressure helium cylinder and the second gas decompression valve. On the high-pressure pipe between the two interfaces; The degassing system includes a vacuum pump, a vacuum container, a vacuum gauge, and a second five-way valve. The second five-way valve includes a second valve body, and the second valve body is provided with a sixth interface, a seventh interface, an eighth interface, and a ninth interface. interface and the tenth interface, the second valve body is equipped with five interface switches corresponding to the sixth to tenth interfaces, the vacuum pump is connected to the vacuum container through the high pressure tube, the vacuum gauge is set on the vacuum container, and the vacuum container is connected to the vacuum container through the high pressure tube Connected to the third port, the first port of the first five-way valve is connected to the eighth port of the second five-way valve through a high-pressure pipe, the fifth port of the first five-way valve is connected to the ninth port of the second five-way valve through High pressure pipe connection; The temperature control system includes a high-temperature unit and a low-temperature unit. The high-temperature unit includes a high-temperature constant temperature box and a first control panel arranged on the high-temperature constant temperature box. The first control panel is provided with a first temperature controller, a first power switch, a heating switch, The indicator light switch and the heater controlled by the heating switch; the low-temperature unit includes a low-temperature thermostat box and a second control panel arranged on the low-temperature thermostat box, and the second control panel is provided with a second temperature controller, a second power switch, a refrigeration switch and refrigeration unit controlled by the refrigeration switch; The adsorption system includes a high-temperature adsorption unit and a low-temperature adsorption unit. The high-temperature adsorption unit includes a first gas buffer tank and several coal sample tanks arranged in a high-temperature constant temperature box. The first gas buffer tank and each coal sample tank are respectively arranged in parallel through connecting pipes. On the high-pressure pipe between the first port and the eighth port, a first pneumatic valve and a first pressure sensor are arranged in series along the gas flow direction on the high-pressure pipe between the first port and the eighth port, and the first gas buffer A first temperature sensor and a second pressure sensor are set on the tank, a second pneumatic valve is set on the connecting pipe connected to the first gas buffer tank, and a second temperature sensor and a third pressure sensor are respectively set on each coal sample tank , the connecting pipe connected to each coal sample tank is respectively provided with a third pneumatic valve; The low-temperature adsorption unit includes a second gas buffer tank and several coal sample tanks arranged in a low-temperature thermostat, and the second gas buffer tank and each coal sample tank are respectively arranged in parallel between the fifth interface and the ninth interface through connecting pipes. On the high-pressure pipe, the fourth pneumatic valve and the fourth pressure sensor are arranged in series along the gas flow direction on the high-pressure pipe between the fifth interface and the ninth interface, and the third temperature sensor and the fifth pressure sensor are arranged on the second gas buffer tank. The pressure sensor, the connecting pipe connected to the second gas buffer tank is provided with the fifth pneumatic valve, the fourth temperature sensor and the sixth pressure sensor are respectively provided on each coal sample tank, the connecting pipe connected to each coal sample tank There are sixth pneumatic valves respectively; The desorption system includes a gas drainage metering device, an electronic balance and a number of desorption gas flowmeters connected in parallel. The measuring ranges of each desorption gas flowmeter are different from each other. A seventh pneumatic valve is respectively arranged on the high-pressure pipe between the desorption gas flowmeter and the seventh interface; The air drainage metering device includes a water storage container, a drain pipe and a water collection container. The upper end of the water storage container is connected to the sixth interface through a high-pressure pipe, and an eighth pneumatic valve is arranged on the high-pressure pipe between the water storage container and the sixth interface. One end of the pipe communicates with the bottom of the water storage container, the other end of the drain pipe communicates with the top of the water collection container, the water collection container is placed on an electronic balance, the tenth interface is connected with an emptying pipe, and the emptying pipe is provided with a ninth pneumatic valve. 2. The high-low temperature and high-pressure adsorption-desorption test device according to claim 1, wherein the data acquisition system includes a computer and a control unit, and the control unit includes a third control panel, and the third control panel is provided with a pressure patrol instrument, Temperature patrol instrument, flow meter display, cryostat switch for controlling the second power switch, high temperature thermostat switch for controlling the first power switch, and the first switch for controlling the pressure patrol instrument and temperature patrol instrument Three power switches, connected by computer control to the first gas pressure reducing valve, the second gas pressure reducing valve, the first five-way valve, the second five-way valve and the first to ninth pneumatic valves. 3. The high-low temperature and high-pressure adsorption-desorption test device according to claim 1 or 2, characterized in that: there are five coal sample tanks in the high-temperature adsorption unit, which are respectively the first coal sample tank, the second coal sample tank, The third coal sample tank, the fourth coal sample tank and the fifth coal sample tank, there are five coal sample tanks in the low-temperature adsorption unit, which are the sixth coal sample tank, the seventh coal sample tank, and the eighth coal sample tank , the ninth coal sample tank and the tenth coal sample tank. 4. The high-low temperature, high-pressure adsorption and desorption test device according to claim 3, characterized in that: the desorption gas flow meter described in the desorption system is three, respectively the first desorption gas flow meter, the second desorption gas flow meter and The third desorption gas flowmeter, the range of the first desorption gas flowmeter is 0-2000ml/min, the measurement range of the second desorption gas flowmeter is 0-500ml/min, and the measurement range of the third desorption gas flowmeter is 0-100ml/min min; there are three flowmeter displays, which are respectively the first flowmeter display, the second flowmeter display, the second desorption gas flowmeter corresponding to the first desorption gas flowmeter, the second desorption gas flowmeter, and the third desorption gas flowmeter. Three flow meter displays.