CN107748081A - Simulate coal core desorption of mash gas device and test device and method in low temperature location of the coring procedure - Google Patents

Abstract

The invention discloses a coal core gas desorption device, a testing device and a method for simulating a low-temperature coring process. control device; the test device for desorption of coal core gas in the simulated low temperature coring process also includes an aeration quantitative system and a vacuum degassing system connected to the coal core gas desorption device in the simulated low temperature coring process through a three-way pipe fitting; The steps of the test method are: preparing coal samples, debugging data acquisition and control devices, air tightness inspection, vacuum degassing, aeration adsorption balance, simulated desorption, and data recording. The present invention simulates the coring process in low temperature environment and the heat exchange effect of the process, conducts the coal core gas desorption test in the low temperature coring process, and realizes the full automation of data collection and processing in the whole process; it can better restore the on-site low temperature The whole process of coring.

Description

Coal core gas desorption device and test device and method in simulating low temperature coring process

technical field

The invention relates to the technical field of mine gas prevention and control, in particular to a coal core gas desorption device, a testing device and a method for simulating a low-temperature coring process.

Background technique

Coal seam gas content is the basic parameter of coal mine governance; in the process of coal seam gas content testing, different sampling methods will also affect the accurate determination of coal seam gas content; at present, most of them adopt the method of core pipe sampling, which has the advantage of fixed-point sampling However, there is a problem that one end of the coal sample is exposed for a long time, and the heat generated by the friction between the core pipe and the coal seam will cause the temperature of the coal sample to rise and cause deterioration, and accelerate the gas desorption of the coal sample; in order to improve the sampling quality and the accuracy of the gas content measurement, To overcome the problem of accelerated desorption of coal samples caused by friction between the core tube and the coal seam, a low-temperature coring technology is proposed, that is, during the sampling process, the core tube continuously reduces the coal core temperature to below 0°C under the action of refrigerant , to reduce the gas desorption rate and gas loss in the coring process as much as possible; however, the gas loss in the actual low-temperature coring process cannot be measured. A set of test methods and simulation devices for coal core gas desorption during low temperature coring.

Contents of the invention

In view of the fact that the leakage of gas in the low-temperature coring process cannot be actually measured, in order to accurately calculate the leakage of coal core gas in the freezing process of coring, it is necessary to have a test method and simulation device for the desorption of coal core gas in the process of low-temperature coring.

The object of the present invention is to provide a coal core gas desorption device, testing device and method in the simulated low temperature coring process to solve this problem.

The object of the present invention is achieved through the following technical solutions:

A coal core gas desorption device for simulating a low-temperature coring process, including a coal sample gas desorption device, a data acquisition control device, and a simulation temperature control device;

The coal sample gas desorption device includes a sealed coal sample tank (8), a pipeline (801) connecting the sealed coal sample tank (8) and the three-way valve (21), and the other two ports of the three-way valve (21) Respectively connect the external pipeline and the desorption instrument (17);

The simulated temperature control device includes a water bath heating tank (6), a freezing chamber (7) and a heater (601) arranged in the water bath heating tank (6), and a temperature control device, and the temperature control device includes a temperature display ( 4) and a stepless voltage regulator (5), the temperature control device is electrically connected to the heater (601);

The data acquisition control device includes a computer (3), a pressure sensor (13) installed on the pipeline (801), a temperature sensor (14) installed in the sealed coal sample tank, and a temperature sensor (14) installed in the freezer (7). The sensor (15) and the temperature sensor (16) arranged in the water bath heating tank (6), the computer (3) is electrically connected to the pressure sensor (13), temperature sensor (14), temperature sensor (15), temperature sensor (16) and the temperature control device.

A test device for simulating the desorption of coal core gas in the process of simulating low-temperature coring, the test device also includes an inflatable quantitative system and a vacuum degassing system connected to the desorption device of coal core gas in the process of simulating low-temperature coring through a three-way pipe fitting , a valve (20) is provided between the inflatable quantitative system and the three-way fitting, and a valve (22) is arranged between the vacuum degassing system and the three-way fitting;

The gas filling and quantitative system is composed of high-pressure methane gas cylinders (1), valves (18), pressure gauges (11), valves (19), gas charging tanks (2) and pipelines connected to valves (20) connected in sequence by pipelines. A pressure gauge (12) is set on the pipeline;

The vacuum degassing system includes a vacuum pump (10), a vacuum pipeline connecting the vacuum pump (10) and a valve (22), and a vacuum gauge (9) arranged on the vacuum pipeline.

A test method for simulating coal core gas desorption in a low temperature coring process, comprising the following steps:

Step1. Prepare coal sample: crush the original coal sample with a pulverizer, screen the coal sample of 0.17-0.25mm, add appropriate amount of distilled water and stir, put the coal sample mixed with water into a self-made mold, and put it on the pressure loader , apply a pressure of 60kN, press for 30 minutes, and the formed coal is the required coal sample;

Step2. Debugging data acquisition system: Make sure the temperature sensors (14), (15), (16) and pressure sensors (13) are in normal state;

Step3. Check the airtightness of the device: In order to ensure the accuracy of the experimental results, the airtightness of the equipment must be checked before the experiment begins; keep it for 24 hours after inflating, and observe whether the pressure in the coal sample tank (8) changes. If there is no change, carry out Follow-up operation; if there is a change, test each part, take measures to seal and re-test according to the above steps;

Step4. Coal sample vacuum degassing: Turn on the vacuum pump (10) to vacuum degas the coal sample until the value displayed by the vacuum gauge (9) is below 10Pa, and perform subsequent operations;

Step5. Inflatable adsorption balance: After closing the gas filling and degassing valve (22) of the coal sample tank (8), open the valve (18) of the high-pressure methane gas cylinder to make the gas filling tank (2) reach a certain pressure, and put the coal sample tank (8) Place it at room temperature, and monitor the pressure of the inflatable tank (2); when the pressure in the coal sample tank (8) remains unchanged for 12 hours, it is considered that the coal sample has reached adsorption equilibrium, and subsequent operations are carried out;

Step6. Simulated desorption:

Add an appropriate amount of refrigerant into the freezer (7), then put the inflated and balanced coal sample tank (8) into the freezer (7) so that it surrounds the coal sample tank (8) evenly, and connect the data collection The system monitors the environment of the coal sample tank (8), the temperature change in the center of the coal core and the freezer (7) and the pressure change in the coal sample tank (8);

Put the coal sample tank (8) placed in the freezer (7) into the heating bath (6) as a whole, and the heating bath (6) heats up the whole body under the set program, so that the coal sample can be heated under different temperature conditions. Under desorption;

Step7. Data recording: During the temperature change process, open the valve of the desorption instrument (17), collect the desorption gas and read it every 30s, and record the data for 60 minutes in total.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

The present invention can simulate the coring process in the low temperature environment and the heat exchange effect of the process, conduct the coal core gas desorption test in the low temperature coring process, and realize the full automation of data collection and processing in the whole process; it can better Restore the whole process of on-site low-temperature coring.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

In the description of the present invention, it should be noted that the orientations indicated by the terms "center", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" etc. Or the positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , and therefore cannot be construed as a limitation of the present invention.

As shown in Figure 1, a coal core gas desorption device in the simulated low temperature coring process, including a coal sample gas desorption device, a data acquisition control device and a simulation temperature control device;

The coal sample gas desorption device includes a sealed coal sample tank (8), a pipeline (801) connecting the sealed coal sample tank (8) and the three-way valve (21), and the other two ports of the three-way valve (21) Respectively connect the external pipeline and the desorption instrument (17);

The simulated temperature control device includes a water bath heating tank (6), a freezing chamber (7) and a heater (601) arranged in the water bath heating tank (6), and a temperature control device, and the temperature control device includes a temperature display ( 4) and a stepless voltage regulator (5), the temperature control device is electrically connected to the heater (601);

The data acquisition control device includes a computer (3), a pressure sensor (13) installed on the pipeline (801), a temperature sensor (14) installed in the sealed coal sample tank, and a temperature sensor (14) installed in the freezer (7). The sensor (15) and the temperature sensor (16) arranged in the water bath heating tank (6), the computer (3) is electrically connected to the pressure sensor (13), temperature sensor (14), temperature sensor (15), temperature sensor (16) and the temperature control device.

A test device for simulating the desorption of coal core gas in the process of simulating low-temperature coring, the test device also includes an inflatable quantitative system and a vacuum degassing system connected to the desorption device of coal core gas in the process of simulating low-temperature coring through a three-way pipe fitting , a valve (20) is provided between the inflatable quantitative system and the three-way fitting, and a valve (22) is arranged between the vacuum degassing system and the three-way fitting;

The gas filling and quantitative system is composed of high-pressure methane gas cylinders (1), valves (18), pressure gauges (11), valves (19), gas charging tanks (2) and pipelines connected to valves (20) connected in sequence by pipelines. A pressure gauge (12) is set on the pipeline;

The vacuum degassing system includes a vacuum pump (10), a vacuum pipeline connecting the vacuum pump (10) and a valve (22), and a vacuum gauge (9) arranged on the vacuum pipeline.

A test method for simulating coal core gas desorption in a low temperature coring process, comprising the following steps:

Step1. Prepare coal sample: crush the original coal sample with a pulverizer, screen the coal sample of 0.17-0.25mm, add appropriate amount of distilled water and stir, put the coal sample mixed with water into a self-made mold, and put it on the pressure loader , apply a pressure of 60kN, press for 30 minutes, and the formed coal is the required coal sample;

Step2. Debugging data acquisition system: Make sure the temperature sensors (14), (15), (16) and pressure sensors (13) are in normal state;

Step3. Check the airtightness of the device: In order to ensure the accuracy of the experimental results, the airtightness of the equipment must be checked before the experiment begins; keep it for 24 hours after inflating, and observe whether the pressure in the coal sample tank (8) changes. If there is no change, carry out Follow-up operation; if there is a change, inspect each part, take measures to seal and re-inspect according to the above steps;

Step4. Coal sample vacuum degassing: Turn on the vacuum pump (10) to vacuum degas the coal sample until the value displayed by the vacuum gauge (9) is below 10Pa, and perform subsequent operations;

Step5. Inflatable adsorption balance: After closing the gas filling and degassing valve (22) of the coal sample tank (8), open the valve (18) of the high-pressure methane gas cylinder to make the gas filling tank (2) reach a certain pressure, and put the coal sample tank (8) Place it at room temperature, and monitor the pressure of the inflatable tank (2); when the pressure in the coal sample tank (8) remains unchanged for 12 hours, it is considered that the coal sample has reached adsorption equilibrium, and subsequent operations are carried out;

Step6. Simulated desorption:

Add an appropriate amount of refrigerant into the freezer (7), then put the inflated and balanced coal sample tank (8) into the freezer (7) so that it surrounds the coal sample tank (8) evenly, and connect the data collection The system monitors the environment of the coal sample tank (8), the temperature change in the center of the coal core and the freezer (7) and the pressure change in the coal sample tank (8);

Put the coal sample tank (8) placed in the freezer (7) into the heating bath (6) as a whole, and the heating bath (6) heats up the whole body under the set program, so that the coal sample can be heated under different temperature conditions. Under desorption;

Step7. Data recording: During the temperature change process, open the valve of the desorption instrument (17), collect the desorption gas and read it every 30s, and record the data for 60 minutes in total.

In summary, through the description of this embodiment, those skilled in the art can better implement this solution.

Claims (3)

1. coal core desorption of mash gas device in one kind simulation low temperature location of the coring procedure, it is characterised in that：Including coal sample desorption of mash gas device, Data acquisition control device and simulation temperature control device；

The coal sample desorption of mash gas device includes sealing coal sample tank（8）, connection sealing coal sample tank（8）And triple valve（21）Pipeline （801）, the triple valve（21）Two other interface connect exterior tubing and desorption instrument respectively（17）；

The simulation temperature control device includes water-bath heating slot（6）, be arranged on water-bath heating slot（6）In cool chamber（7）And heating Device（601）And temperature control device, the temperature control device include temperature indicator（4）With stepless pressure regulation device（5）, the temperature control dress Put and heater（601）Electrical connection；

The data acquisition control device includes computer（3）, be arranged at pipeline（801）On pressure sensor（13）, set Temperature sensor in sealing coal sample tank（14）, be arranged at cool chamber（7）In temperature sensor（15）Be arranged at water-bath Heating tank（6）In temperature sensor（16）, the computer（3）Pressure sensor is electrically connected respectively（13）, TEMP Device（14）, temperature sensor（15）, temperature sensor（16）With the temperature control device.

2. a kind of test device including simulating coal core desorption of mash gas device in low temperature location of the coring procedure described in claim 1, it is special Sign is：The test device is also included by tee pipe fitting and coal core desorption of mash gas device in the simulation low temperature location of the coring procedure The inflation quantitative system and vacuum degassing system of connection, valve is provided between the inflation quantitative system and tee pipe fitting （20）, valve is provided between the vacuum degassing system and tee pipe fitting（22）；

The high pressure methane gas cylinder that the inflation quantitative system is linked in sequence by pipeline（1）, valve（18）, pressure gauge（11）, valve （19）, gasing tank（2）And connecting valve（20）Pipeline, be provided with pressure gauge on the pipeline（12）；

The vacuum degassing system includes vavuum pump（10）, connection vavuum pump（10）With valve（22）Vacuum pipeline and be arranged on Vacuum meter on vacuum pipeline（9）.

3. a kind of usage right requires the method for testing of 2 test devices, it is characterised in that comprises the following steps：

Step1. coal sample is prepared：Taken original coal sample is crushed with pulverizer, screens 0.17~0.25mm coal sample, addition is appropriate Distilled water is stirred, and the coal sample being mixed with water is fitted into homemade mould, is placed on pressure-loaded machine, applies 60kN pressures Power, suppresses 30min, and manufactured moulded coal is required coal sample；

Step2. tune-up data acquisition system：Temperature sensor（14）、（15）、（16）And pressure sensor（13）In just Normal state；

Step3. check device air-tightness：In order to ensure that the accuracy of experimental result, experiment must be to equipment air-tightness before starting Checked；24h is kept after inflation, observes coal sample tank（8）Whether interior pressure changes, if unchanged, carries out subsequent operation；If hair Changing, each position is detected, take measures to be sealed and re-start detection by above-mentioned steps；

Step4. coal sample vacuum outgas：Open vavuum pump（10）, vacuum outgas is carried out to coal sample, until vacuum meter（9）Show value To carry out subsequent operation during below 10Pa；

Step5. adsorption equilibrium is inflated：Close coal sample tank（8）Inflation degassing valve（22）Afterwards, high pressure methane gas cylinder valve is opened （18）, make gasing tank（2）Reach certain pressure, and by coal sample tank（8）It is positioned in room temperature, to gasing tank（2）Pressure is supervised Survey；When coal sample tank（8）Internal pressure try hard to keep hold 12h it is constant when, it is believed that coal sample reaches adsorption equilibrium, carries out subsequent operation；

Step6. simulation desorption：

In cool chamber（7）It is interior to add appropriate refrigerant, then by the coal sample tank after Inflatable balance（8）It is put into cool chamber（7）It is interior, make It is uniformly looped around coal sample tank（8）Around, data collecting system is connected, monitors coal sample tank（8）Environment, coal core center and freezing Storehouse（7）Interior temperature change and coal sample tank（8）Interior pressure change；

Cool chamber will be placed on（7）Interior coal sample tank（8）Entirety is put into heating bath（6）In, heat bath（6）In setting program Under heating heating is carried out to its entirety, coal sample is desorbed under condition of different temperatures；

Step7. data record：During alternating temperature, desorption instrument is opened（17）Valve, collect desorption gas and read once per 30s, Data record 60min altogether.