CN205333462U - A servo measurement testing system for testing coal sample gas absorption desorption rule - Google Patents

Abstract

A servo measurement testing system for testing coal sample gas absorption desorption rule is including gas feeding device, evacuating device, gas adsorption equipment, gas desorption measuring device and electrically controlled device, gas feeding device includes high -pressure gas jar and aeration tank, evacuating device includes vacuum pump and vacuum meter, gas adsorption equipment includes the coal sample jar, gas desorption measuring device includes water container, collecting container, electronic balance, servo motor, fixed bolster and aqueduct. The utility model discloses a turn into the measurement of aqueous water volume with the gaseous cubing of gas desorption, the test operation is simple and convenient, and the tentation data is accurate, has realized that the real -time accurate automatic acquisition of tentation data shows with real -time to guarantee that gas that the coal sample separated the suction under an atmospheric pressure condition, for research coal body gas adsorbs desorption rule, provides more reliable data basis.

Description

Servo measurement test system for testing gas adsorption and desorption laws of coal samples

technical field

The utility model belongs to the technical field of gas adsorption and desorption measurement devices, in particular to a servo measurement test system for testing the law of gas adsorption and desorption of coal samples.

Background technique

The law of coal gas desorption provides a theoretical basis for the determination of coal seam gas content and pressure, prediction of coal and gas outburst, and exploration and development of coal bed methane resources. At present, people have done a lot of research on the law of adsorption and desorption of coal bodies. On the one hand, the amount of gas loss is calculated according to the law of gas desorption; At present, the research method of coal gas desorption law mainly adopts the adsorption-desorption experimental method, while the research on the initial law of coal gas desorption is mainly to measure the desorption rate and desorption amount of coal sample gas. The measuring device is a gas desorption instrument. The technology of this equipment is very mature, but most of the gas desorption measurement adopts graduated cylinders. The use of this type of device still has the following disadvantages: 1. The test personnel need to spend a lot of time and energy to record the data, the error of manual reading is large, and the data cannot be recorded in real time; 2. When reading the scale of the liquid volume in the measuring cylinder, the fluctuation of the liquid level in the measuring cylinder due to the drainage method will affect the test personnel. Reading data, especially when the amount of gas desorption in the initial gas desorption stage is large, it is difficult for the experimenters to read the data accurately; 3. At present, the water drainage method is used to measure the gas volume, and the water can only be discharged when the pressure of the gas is greater than one atmospheric pressure, so that The methane gas desorbed from the coal sample is greater than one atmospheric pressure, and the volume of the methane gas at this time will change, and there are errors.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides a test with simple operation, accurate test data, real-time automatic data collection, and ensures that the gas gas desorbed from the coal sample is used for testing under the condition of an atmospheric pressure. Servo measurement test system for gas adsorption and desorption laws of coal samples.

In order to solve the above technical problems, the utility model adopts the following technical scheme: a servo measurement test system for testing the gas adsorption and desorption laws of coal samples, including a gas supply device, a vacuum device, a gas adsorption device, a gas desorption measurement device and an electric control device The gas supply device includes a high-pressure gas tank and an inflatable tank. The high-pressure gas tank and the inflatable tank are connected through an air guide tube. The gas outlet end of the high-pressure gas tank is provided with an on-off valve. In the flow direction, a pressure reducing valve, a first air pressure gauge, a first three-way valve and a first valve are arranged in series; On the air pipe between the vacuum pump and the first three-way valve, on the air pipe between the vacuum gauge and the vacuum pump, there is a second valve; the gas adsorption device includes a coal sample tank, and the air tank and the coal sample tank are connected through the air pipe The air guide pipe between the gas filling tank and the coal sample tank is provided with a second air pressure gauge, a third valve, a second three-way valve, a fourth valve and a third air pressure gauge in series along the gas flow direction; the gas desorption measuring device includes Water storage container, water collection container, electronic balance, servo motor, fixed bracket and water guide pipe. The air guide pipe is connected with the second three-way valve, the fifth valve is arranged on the air guide pipe between the water storage container and the second three-way valve, the water storage container is connected with a digital pressure gauge, and the bottom of the water storage container is provided with a drain pipe. The drainage pipe is connected with the water guide pipe. The water guide pipe is a hose and is arranged in the fixed bracket. The bottom end of the fixed bracket is fixedly connected to the output shaft of the servo motor. The servo motor is connected to the servo driver through a wire. Below the outlet of the aqueduct, the water collection container is arranged on the electronic balance, and the digital pressure gauge, the servo driver and the electronic balance are respectively connected to the electric control device through wires.

The electric control device adopts a computer or a single-chip microcomputer or a PLC or an integrated circuit.

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

1. The servo measurement test system for testing coal sample gas adsorption and desorption laws of the present invention includes a gas supply device, a vacuum device, a gas adsorption device, a gas desorption measurement device and an electric control device. The gas supply device uses a high-pressure gas tank to provide Gas, adjust the gas pressure to the pressure required for the test through the pressure reducing valve, and fill it into the inflatable tank, use the inflatable tank to inject gas gas into the coal sample, so that the coal sample can fully absorb the gas until the adsorption balance is reached; The vacuum device uses a vacuum pump to degas the entire test system to ensure that only gas gas participates in the test during the test, thereby eliminating the interference of other gases on the test results; the gas adsorption device is used for gas adsorption and desorption tests of coal samples; gas desorption The measuring device is used to measure the gas desorption rate and desorption amount; the electronic control device is used to collect, store and display the gas desorption amount and desorption rate in real time;

2. The utility model adopts a gas desorption measuring device. After the gas desorption test is started, the desorbed gas enters the upper part of the water storage container through the air guide pipe, so that the gas pressure at the top of the water storage container increases, and the digital pressure gauge will detect the gas. The value after the desorbed gas pressure rises is transmitted to the electronic control device in real time. The electronic control device makes the servo motor rotate by controlling the servo driver. Since the bottom of the fixed bracket is fixed on the output shaft of the servo motor, the water guide pipe and the fixed bracket follow the servo motor. Rotating clockwise, the liquid water in the water storage container is discharged into the water collection container through the drain pipe and the water guide pipe, and the water level in the water guide pipe and the water level in the water storage container are always on the same plane due to the connection, realizing gas desorption The gas is kept at an atmospheric pressure to avoid changes in the volume of the sucked gas. The electronic balance transmits the mass increase value of the liquid water in the water collection container and the accumulated quality data of the liquid water in the water collection container to the electronic control device in real time. The device converts the test data transmitted by the electronic balance into the gas desorption amount and desorption rate and displays them in real time, realizing the automatic collection and real-time display of the gas desorption rate and gas desorption data. With the above device, the data collection is accurate and fast, avoiding manual The error in the readings improves the accuracy of the test, saves data processing time, and facilitates researchers to better analyze the test results.

Description of drawings

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

detailed description

As shown in Figure 1, the servo measurement test system for testing coal sample gas adsorption and desorption laws of the present invention includes a gas supply device, a vacuum device, a gas adsorption device, a gas desorption measurement device and an electric control device 1; the gas supply The device includes a high-pressure gas tank 2 and an inflatable tank 3. The high-pressure gas tank 2 and the inflatable tank 3 are connected through an air guide tube 4. The gas outlet end of the high-pressure gas tank 2 is provided with an on-off valve 5. Between the high-pressure gas tank 2 and the inflatable tank 3 The gas guide pipe 4 is provided with a pressure reducing valve 6, a first air pressure gauge 7, a first three-way valve 8 and a first valve 9 in series along the gas flow direction; the vacuum pumping device includes a vacuum pump 10 and a vacuum gauge 11, and the vacuum pump 10 passes through The air guide pipe 4 communicates with the first three-way valve 8, the vacuum gauge 11 is arranged on the air guide pipe 4 between the vacuum pump 10 and the first three-way valve 8, and the air guide pipe 4 between the vacuum gauge 11 and the vacuum pump 10 is provided with the first Two valves 12; the gas adsorption device includes a coal sample tank 13, the inflatable tank 3 and the coal sample tank 13 are connected through the gas guide tube 4, and the gas guide tube 4 between the gas tank 3 and the coal sample tank 13 is sequentially connected in series along the gas flow direction A second air pressure gauge 14, a third valve 15, a second three-way valve 16, a fourth valve 17 and a third air pressure gauge 18 are provided; the gas desorption measurement device includes a water storage container 19, a water collection container 20, an electronic balance 21, Servo motor 22, fixed support 23 and water guide pipe 24, water storage container 19 is airtight structure, and water storage container 19 top is provided with water inlet pipe 25, and water inlet pipe 25 is provided with water inlet valve 26, and water storage container 19 tops pass air guide pipe 4 communicates with the second three-way valve 16, the air guide pipe 4 between the water storage container 19 and the second three-way valve 16 is provided with a fifth valve 27, the water storage container 19 is connected with a digital pressure gauge 28, and the water storage container 19 bottom is provided with drainage pipe 29, and drainage pipe 29 is communicated with aqueduct 24, and aqueduct 24 is flexible pipe and is arranged in fixed support 23, and the bottom end of fixed support 23 is fixedly connected on the output shaft of servo motor 22, and servo motor 22 Connected with a servo driver 30 by wires, the upper part of the water collection container 20 is open and located below the outlet of the water guide pipe 24, the water collection container 20 is arranged on the electronic balance 21, and the digital pressure gauge 28, the servo driver 30 and the electronic balance 21 pass through respectively. The wire is connected with the electric control device 1 . The gas filled in the high-pressure gas tank 2 is commercially available methane standard gas with a volume of 40L/bottle and a purity of ≥99.99%. The pressure resistance of the air duct 4 is above 60MPa.

The electric control device 1 adopts a computer or a single-chip microcomputer or a PLC or an integrated circuit.

Among them, the vacuum pump 10, the servo motor 22, the servo driver 30, the electronic balance 21 and the digital pressure gauge 28 are all conventional technologies in the field, and their specific structures will not be described in detail.

The test method of the servo measurement test system for testing the law of gas adsorption and desorption of coal samples 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, check the test system to ensure that the test system is connected reliably, and use helium Check the air tightness of the test system to ensure that the air tightness of the test system is good;

(2) Fill the coal sample in the coal sample tank 13;

(3) Open the water inlet valve 26 and fill the water storage container 19 with liquid water 31 through the water inlet pipe 25, and then close the water inlet valve 26;

(4) Close the on-off valve 5, the pressure reducing valve 6 and the fifth valve 27, open the first valve 9, the second valve 12, the third valve 15 and the fourth valve 17, and start the vacuum pump 10 to pair the inflatable tank 3 and the coal sample tank 13 and the gas guide pipe 4 connecting the gas tank 3 and the coal sample tank 13 are degassed until the vacuum gauge 11 shows 20Pa and closes the vacuum pump 10 for more than six hours, and simultaneously closes the second valve 12 and the third valve 15;

(5) Open the switch valve 5 of the high-pressure gas tank 2, adjust the pressure reducing valve 6 according to the first air pressure gauge 7, and fill the gas tank 3 with gas through the high-pressure gas tank 2. When the indication of the second air pressure gauge 14 reaches the inflation When the predetermined pressure value of the tank 3 is reached, the switch valve 5 and the first valve 9 are closed, the third valve 15 is opened to start the gas adsorption test, and the coal sample tank 13 is filled with gas gas through the inflatable tank 3, and the coal sample is fully adsorbed until it is adsorbed. Equilibrium, when the indication of the second barometer 14 remains unchanged for three consecutive hours and the adsorption time is greater than ten hours, the coal sample reaches adsorption equilibrium;

(6) After the gas adsorption test is completed, close the third valve 15, open the fifth valve 27, and start the gas desorption test. The desorbed gas enters the upper part of the water storage container 19 through the air guide tube 4, and the top of the water storage container 19 As the gas pressure rises, the digital pressure gauge 28 transmits the detected desorbed gas pressure rise to the electric control device 1 in real time. The electric control device 1 controls the servo driver 30 to make the servo motor 22 rotate, and the water guide pipe 24 and the fixed The bracket 23 rotates clockwise with the servo motor 22, and the liquid water 31 in the water storage container 19 is discharged into the water collection container 20 through the drain pipe 29 and the aqueduct 24, and the water level in the aqueduct 24 and the water level in the water storage container 19 Because it is connected, it is always located on the same plane, so that the desorption gas is kept at an atmospheric pressure, and the electronic balance 21 calculates the mass increase value of the liquid water 31 in the water collection container 20 and the accumulated mass data of the liquid water 31 in the water collection container 20 in real time. Transmission to the electronic control device 1, the electronic control device 1 simultaneously converts the test data transmitted by the electronic balance 21 into the gas desorption amount and desorption rate and displays them in real time, realizing the automatic collection and real-time display of the data of the gas desorption rate and gas desorption amount;

(7) To sort out the experimental data, the final gas desorption amount of the coal sample is the measured gas desorption amount minus the volume of the dead space of the test system and the internal void space of the coal sample.

After detecting the airtightness of the test system in step (1), the volume V of the dead space of the test system is calibrated, and the inflatable tank 3 and the coal sample tank 13 are vacuumized, between the first valve 9 and the third valve 15 The total volume of the air guide tube 4 and the air tank 3 is V ₁ , the air guide tube 4 between the third valve 15 and the second three-way valve 16, the air guide tube between the fifth valve 27 and the second three-way valve 16 4. The total volume of the gas guide pipe 4 and the coal sample tank 13 between the coal sample tank 13 and the second three-way valve 16 is set to V ₂ , and the second valve 12, the third valve 15, the fourth valve 17 and the fifth valve are closed. Valve 27, open the first valve 9, fill in the inflatable tank 3 and be the helium that pressure is P ₁ , after the second barometer 14 stabilizes, close the first valve 9, open the third valve 15 and the fourth valve 17, Helium enters the coal sample tank 13 from the inflatable tank 3. When the second barometer 14 is stable, write down the indication P ₂ of the second barometer 14. According to the ideal gas state equation, P ₁ V ₁ =P ₂ (V ₁ +V ₂ ); put an aluminum column with a volume of V ₀ in the coal sample tank 13, vacuumize the gas tank 3 and the coal sample tank 13, close the second valve 12, the third valve 15, and the fourth valve 17 and the fifth valve 27, open the first valve 9, fill the gas tank ₃ with helium with a pressure of P3, when the second air pressure gauge 14 is stable, close the first valve 9, open the third valve 15 and the second Four valves 17, helium enters the coal sample tank 13 from the inflatable tank 3, when the second air pressure gauge 14 is stable, write down the indication P ₄ of the second air pressure gauge 14, according to the ideal gas state equation, P ₃ V ₁ = P ₄ (V ₁ +V ₂ -V ₀ ), thus calculate the values of V ₁ and V ₂ , the volume of the dead space of the test system V=V ₁ +V ₂ .

After the coal sample is loaded in step (2), the volume V _hole of the void space inside the coal sample is calibrated. The mass of the coal sample in the coal sample tank 13 is m, the apparent density of the coal sample is ρ, and the _apparent density of the coal sample is The volume V _depends on=m/ρ, vacuumize _the inflatable tank 3 and the coal sample tank 13, close the second valve 12, the third valve 15, the fourth valve 17 and the fifth valve 27, open the first valve 9, Fill the gas tank 3 with helium with a pressure of P _5. After the second air gauge 14 is stable, close the first valve 9, open the third valve 15 and the fourth valve 17, and the helium gas enters the coal by the gas tank 3. For the sample tank 13, when the second air pressure gauge 14 is stable, write down the reading P ₆ of the second air pressure gauge 14. According to the ideal gas state equation, P ₅ V ₁ =P ₆ (VV _view +V _hole ), thus calculating The volume of void space _Vpores inside the coal sample.

The test method of the servo measurement test system for testing the gas adsorption and desorption laws of coal samples of the utility model can carry out the following various tests:

(1) Experiments on the law of adsorption and desorption of coal gas;

(2) Isothermal adsorption test and gas emission test.

The test method of the servo measurement test system for testing coal sample gas adsorption and desorption laws of the utility model converts the volume measurement of gas desorption gas into the measurement of liquid water volume, and realizes real-time, accurate and automatic collection of test data, without the need for test personnel Reading data reduces manual errors and mainly solves the problem of large amount of gas desorption in the initial stage of gas desorption and cannot be accurately measured. It provides a more reliable data basis for studying the law of coal gas desorption, so that laboratory test results can be theoretically Guidance on practical problems such as coal and gas outburst prediction, coalbed methane reservoir development, etc.

The test method of the servo measurement test system for testing the gas adsorption and desorption laws of coal samples of the utility model calibrates the volume V of the dead space of the test system and the volume V _hole of the void space inside the coal sample, and the final gas of the coal sample The desorption amount is the gas desorption amount measured by the test minus the volume V of the dead space of the test system and the volume V _hole of the void space inside the coal sample, which makes the data measured by the test more accurate and convincing.

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 (2)

1. the servo for testing coal sample gas adsorption adsorption law measures pilot system, it is characterised in that: include gas feedway, vacuum extractor, gas adsorption device, desorption of mash gas measurement apparatus and electric control gear；Gas feedway includes high pressure gas tank and gasing tank, connected by airway between high pressure gas tank and gasing tank, the outlet side of high pressure gas tank is provided with controlled valve, the airway between high pressure gas tank and gasing tank is sequentially connected in series along gas circulating direction and is provided with air relief valve, the first air gauge, the first three-way valve and the first valve；Vacuum extractor includes vacuum pump and vacuometer, and vacuum pump is by airway and the connection of the first three-way valve, and vacuometer is located on the airway between vacuum pump and the first three-way valve, and the airway between vacuometer and vacuum pump is provided with the second valve；Gas adsorption device includes coal sample tank, connected by airway between gasing tank with coal sample tank, the airway between gasing tank and coal sample tank is sequentially connected in series along gas circulating direction and is provided with the second air gauge, the 3rd valve, the second three-way valve, the 4th valve and the 3rd air gauge；Desorption of mash gas measurement apparatus includes tank, collecting container, electronic balance, servomotor, fixed support and aqueduct, tank is closed structure, tank top is provided with water inlet pipe, water inlet pipe is provided with inlet valve, tank top is by airway and the connection of the second three-way valve, airway between tank and the second three-way valve is provided with the 5th valve, tank is connected to digital pressure gauge, drain pipe it is provided with bottom tank, drain pipe connects with aqueduct, aqueduct is flexible pipe and is arranged in fixed support, fixed support bottom is fixedly connected on the output shaft of servomotor, servomotor is connected to servo-driver by wire, collecting container open topped is also positioned at the lower section in aqueduct exit, collecting container is arranged on electronic balance, digital pressure gauge, servo-driver and electronic balance are connected with electric control gear respectively through wire。

2. the servo for testing coal sample gas adsorption adsorption law according to claim 1 measures pilot system, it is characterised in that: electric control gear adopts computer or single-chip microcomputer or PLC or integrated circuit。