CN112945803A - Device and method for measuring diffusion speed of externally-applied pulse reinforced gas under coal matrix - Google Patents
Device and method for measuring diffusion speed of externally-applied pulse reinforced gas under coal matrix Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 175
- 238000009792 diffusion process Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000011159 matrix material Substances 0.000 title claims abstract description 8
- 238000001179 sorption measurement Methods 0.000 claims abstract description 18
- 230000000007 visual effect Effects 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000002474 experimental method Methods 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 7
- 238000012806 monitoring device Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 238000002441 X-ray diffraction Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000004587 chromatography analysis Methods 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 238000002411 thermogravimetry Methods 0.000 claims description 2
- 238000001228 spectrum Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a device and a method for measuring the diffusion speed of externally-added pulse reinforced gas under a coal matrix, belonging to the field of gas index measuring devices. The high-voltage pulse device comprises an electric pulse device, a coal sample tank, an inflatable air bag, a vacuum pump, a valve, a pressure sensor, a temperature sensor, a moisture tester, a chromatographic analyzer and a visual monitor, and the high-voltage pulse device comprises an electric power supply, an insulating slide base, a cable, a pulse electrode plate and an insulating protection plate. The method measures the initial gas diffusion speed in an electric pulse state, realizes the change of different voltages, has good stabilizing effect and is simple and easy to operate; meanwhile, the change rule of the coal multivariate relevant factors influencing the gas diffusion speed, namely the influence of the gas components, the conductivity, the thermal property, the temperature, the moisture, the adsorption time, the adsorption pressure, the gas concentration and the like of the coal sample on the initial gas speed of the coal, is monitored and detected in real time. The measuring process is simple and convenient, the effect is obvious, the cost is lower, and the measuring precision is higher.
Description
Technical Field
The invention relates to a device and a method for measuring gas diffusion speed, in particular to a device and a method for measuring the gas diffusion speed by externally applying pulse strengthening under a coal matrix, belonging to the field of gas index measuring devices.
Background
Coal and gas outburst is one of the most serious disasters of coal mines in China, the initial speed of gas diffusion is one of indexes for predicting the gas outburst, the gas diffusion capacity of coal has a direct relation with the outburst occurrence, and the research on the gas diffusion speed is of great significance for researching the coal and gas outburst. However, the influence of factors such as the chemical and physical properties and structural characteristics of the coal sample on the gas released from the coal is highlighted, the research is not thorough at present, the electric pulse acts on the coal body so as to change the main physical parameters, adsorption and desorption capacity, seepage characteristics and the like of the coal body, and related experimental equipment for improving the initial gas release speed and gas permeation and flowing of the coal body under the action of the electric pulse is lacked. Therefore, it is necessary to develop a device for highlighting the influence of coal multi-element factors on the gas diffusion speed under the action of external electric pulses, which lays an experimental foundation for realizing accurate determination of the indexes and has important significance for researching coal and gas outburst.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a simple, practical and high-accuracy device and method for measuring the gas diffusion speed enhanced by externally applied pulses under a coal matrix, which can be used for improving the initial gas diffusion speed of a coal body under the action of the externally applied pulses, adjusting the permeation and flow of the gas of the coal body, simultaneously detecting the influence of factors such as the composition, the conductivity, the thermal property, the temperature, the moisture, the adsorption time and the adsorption pressure of the coal body on the gas diffusion speed in real time, and finally realizing quantitative and qualitative analysis on the influence trend of different coal factors on the initial gas diffusion speed by using the data.
In order to achieve the technical purpose, the invention provides a coal substrate lower externally added pulse strengthening gas diffusion speed measuring device which comprises a coal sample tank a, a coal sample tank b, a rectangular container with an upper opening and a constant temperature water tank, wherein the coal sample tank a and the coal sample tank b are connected through a pipeline, the bottom of the rectangular container is provided with an insulating slide way base with matched size, the insulating slide way base is connected with an electrostatic shielding instrument through a lead, two sides and the rear part of the rectangular container are respectively provided with an insulating protection plate and matched with the insulating slide way base, the coal sample tank a and the coal sample tank b are arranged on the insulating slide way base, two sides of the coal sample tank a and the coal sample tank b are respectively provided with two pulse electrode plates on the insulating slide way base, the two pulse electrode plates are connected with a high voltage power supply through cables, the two pulse electrode plates are respectively connected with the positive electrode and the negative electrode of the high voltage power supply, the rectangular, can realize the thermostatic waterbath with the water input rectangle container in the thermostatic waterbath through the pipeline, also can discharge the water in the rectangle container or return the thermostatic waterbath, be equipped with temperature sensor on the thermostatic waterbath, coal sample jar a is connected with the moisture tester, coal sample jar a passes through pipeline and connects chromatographic analyzer and steel bottle respectively, be connected with the manometer on the steel bottle, coal sample jar b passes through the pipeline and is connected with the air bag, air bag entrance is equipped with valve b, wherein coal sample jar a and coal sample jar b still are connected with storage container through tee bend communicating pipe respectively, storage container passes through the pipeline and is connected with pressure sensor and vacuum pump respectively, pressure sensor has vacuometer and visual monitor through connecting tube series connection.
And a valve a is arranged on the pipeline between the coal sample tank a and the three-way communicating pipe, and a valve c is arranged on the pipeline between the coal sample tank b and the three-way communicating pipe.
The steel cylinder is stored with gas, the vacuum pump and the valve d form a vacuum pumping device, and the valve d is arranged between the storage container and the vacuum pump.
The pulse electrode plate is made of copper and is 4mm thick.
The height of the pulse electrode plate is higher than that of the coal sample tank.
The bearing range of the coal sample tank a and the coal sample tank b is from vacuum to 20MPa, the temperature range of the constant-temperature water tank is from 0 ℃ to 80 ℃, the effective range of the vacuum meter is from 0 to standard atmospheric pressure, and the precision is 1 Pa.
A method for measuring a device for measuring the diffusion speed of externally-applied pulse reinforced gas under a coal matrix comprises the following steps:
firstly, detecting the air tightness of a pipeline, and then respectively filling 5-10g of coal samples into a coal sample tank a and a coal sample tank b;
placing a coal sample tank a and a coal sample tank b on an insulating base sliding chute, arranging insulating protection plates on two sides and the rear of a base of the insulating base sliding chute, and opening an electrostatic shielding instrument connected below the insulating base sliding chute;
after the coal sample tank a and the coal sample tank b are sealed, closing all other valves, only opening the valve d, and simultaneously evacuating the coal samples in the coal sample tank a and the coal sample tank b, the connecting pipeline and the air in the storage container by using a vacuum pump;
after the vacuumizing is finished, closing the valve d and the vacuum pump in sequence, opening the visual monitoring device, analyzing, adsorbing and analyzing, performing infrared analysis, chromatographic analysis, X-ray diffraction analysis and thermogravimetric analysis, monitoring and controlling the gas diffusion process in the coal sample tank a and the coal sample tank b in real time, and recording and analyzing relevant dynamic data including coal sample gas components, conductivity, thermal properties, temperature, moisture, adsorption time, adsorption pressure and gas concentration;
a high-voltage power supply is turned on, and pulse waves are transmitted to pulse electrode plates on two sides of the coal sample tank a and the coal sample tank b through cables;
then opening the valve a and the steel cylinder until the gas absorbed by the coal samples in the coal sample tank a and the coal sample tank b reaches balance;
closing the valve, opening the coal sample tank a, introducing gas analyzed by the coal sample in the coal sample tank a into the chromatographic analyzer and the storage container through connecting pipelines respectively, reading the readings of the vacuum meter after 10s, closing the coal sample tank a to 35s, opening the coal sample tank again, and closing the coal sample tank to read the readings of the vacuum meter after 60 s;
then opening the vacuum pump and the valve d in sequence until the readings of the vacuum meter are stable, closing the valve d and the vacuum pump, opening the valve b to start timing, releasing gas analyzed by the coal sample in the coal sample tank b to a connecting pipeline and a storage container, reading the readings of the vacuum meter after 0s, closing the coal sample tank b to 35s, opening the coal sample tank b again, closing the coal sample tank when 60s, and reading the readings of the vacuum meter;
respectively obtaining values by unit conversion of the difference between two readings
And P, drawing a coal sample gas diffusion process diagram by using a visual monitoring device, obtaining the influence trend of different factors on the initial gas diffusion speed of the coal, and analyzing the change rule of the components of the precipitated gas by using a chromatographic analyzer.
Providing constant-temperature water baths with different temperatures for the coal sample tank a and the coal sample tank b through a constant-temperature water tank, so that the measurement under different temperatures is realized, a temperature sensor monitors the temperature change in real time, and when the experiment for measuring different water content conditions is carried out, after the experiment is carried out by using coal samples with different water contents, a water content analyzer is used for measuring the water content of the coal sample, and when the adsorbed gas is carried out under the normal pressure condition, an inflatable air bag is used as a gas source; and (3) performing adsorption measurement under a very-low condition, using a steel cylinder as a gas source, filling gas into the steel cylinder before adsorption, and filling gas with corresponding concentration into the gas-filled airbag when an experiment of gas with different gas concentrations is performed within a pressure range preset by a pressure gauge to finish measurement.
The pulse electrode plates are respectively positioned on two sides of the coal sample tank a and the coal sample tank b, and when a plurality of coal sample tanks are arranged between the pulse electrode plates, the field intensity between the pulse electrode plates is changed by adjusting the voltage of the high-voltage power supply.
Has the advantages that:
this device increases the impressed pulse on current gas diffuses the basis of appearance, satisfies the experiment to the gas diffusion initial velocity under the power-on state, and the influence factor that this device can test has coal sample gas composition, temperature, electric conductivity, thermal property, moisture, adsorption time, adsorption equilibrium pressure and gas concentration. The gas diffusion process diagram under different coal samples and experimental environments can be obtained, the influence trend of different factors on the initial gas diffusion speed can be qualitatively analyzed by using the data, the structure is simple, the effect is obvious, the experimental process is simple and convenient, the experimental conditions and the environment can be adjusted according to the requirements, and the application of the current measured initial gas diffusion speed is met.
Drawings
FIG. 1 is a schematic structural diagram of a device for measuring the diffusion rate of gas by externally applying pulse reinforcement under a coal matrix.
1-a moisture tester, 2-an insulating protection plate, 3-an electrostatic shielding instrument, 4-an insulating slide base, 5-a pressure gauge, 6-a cable, 7-a steel cylinder, 8-a vacuum gauge, 9-an inflatable air bag, 10-a pulse electrode plate, 11-a three-way communicating pipe, 12-a constant temperature water tank, 13-a high voltage power supply, 14-a visual monitor, 15-a pressure sensor, 16-a storage container, 17-1-a valve, 17-2-a valve, 17-3-a valve, 17-4-a valve, 18-a vacuum pump, 19-1 a coal sample tank, 19-2 a coal sample tank, 20-a chromatographic analyzer, 21-a temperature sensor and 22-a connecting pipeline.
Detailed description of the preferred embodiment
Before the experiment, detect the gas tightness of whole device at first, then pack into proper amount coal sample dress coal sample in the coal sample jar, the coal sample jar is settled on the insulating base spout, the insulating guard plate of settling of insulating base spout base both sides and rear, opens the electrostatic shielding appearance of insulating base spout below. After the coal sample tanks are covered, the valves are opened, and the vacuum pump simultaneously evacuates the coal samples in the two coal sample tanks, the connecting pipeline and the air in the storage container. After the vacuumizing is finished, the valve and the vacuum pump are sequentially closed, the visual monitoring device is opened, the experiment software is operated, the process of coal sample gas diffusion is monitored and monitored in real time, and relevant dynamic data are recorded and analyzed in time. A high-voltage power supply in the external electric pulse device is turned on, pulse waves are transmitted to pulse electrode plates at two sides of the coal sample tank through cables,
and then opening the valve and the steel cylinder until the gas absorbed by the coal samples in the two coal sample tanks reaches the balance. Closing the valve, opening the gas analyzed by the coal sample in the coal sample tank 1 and 1 through the connecting pipeline respectively in the chromatograph and the storage container, reading the indication number of the vacuum gauge after 10s, closing the coal sample tank 1 to 35s, opening the coal sample tank 1 again, and closing the coal sample tank 1 to 60s to read the indication number of the vacuum gauge. Then, sequentially opening the vacuum pump and the valve until the readings of the vacuum meter are stable, closing the valve and the vacuum pump, opening the valve to start timing, releasing the gas analyzed by the coal sample in the coal sample tank 2 to a connecting pipeline and a storage container, reading the readings of the vacuum meter after 0s of second, and closing the coal sample tank 2 toThe coal sample tank 2 was opened again for 35s, and the coal sample tank 2 was closed by 60s, and the vacuum gauge reading was taken. The difference between the two readings is converted by unit to obtain the value of the experiment
And P, drawing a coal sample gas diffusion process diagram by using the visual monitoring device after the experiment is finished, obtaining the influence trend of different factors on the initial gas diffusion speed of the coal, and analyzing the change rule of the components of the precipitated gas by using a chromatographic analyzer.
When the experiment of different temperatures is measured, the coal sample tank is placed in a constant temperature water tank with set temperature, and the experiment process is the same as the above. When the experiment for measuring different water content conditions is carried out, after the experiment is carried out by using coal samples with different water contents, when the water content of the coal samples is measured by using a water content analyzer and the adsorbed gas is carried out under the normal pressure condition, the gas source is taken as an inflatable air bag; and (3) performing an adsorption experiment under a very-low pressure condition, namely, using a steel cylinder as a gas source, filling gas into the steel cylinder before adsorption, and filling gas with corresponding concentration into the gas-filled airbag when the experiment of the gas with different gas concentrations is performed within a preset pressure range to finish the experiment.
Claims (9)
1. The utility model provides a plus pulse under coal matrix reinforces gas diffusion velocity survey device which characterized in that: the device comprises a coal sample tank a (19-1), a coal sample tank b (19-2), a rectangular container with an upper opening and a thermostatic water tank (12), wherein the coal sample tank a (19-1) and the coal sample tank b (19-2) are connected through a pipeline, the bottom of the rectangular container is provided with an insulating slide base (4) with matched size, the insulating slide base (4) is connected with an electrostatic shielding instrument (3) through a lead, two sides and the rear of the rectangular container are respectively provided with an insulating protection plate (2) and the insulating slide base (4) are matched, the coal sample tank a (19-1) and the coal sample tank b (19-2) are arranged on the insulating slide base (4), pulse electrode plates (10) are respectively arranged on the insulating slide base (4) at two sides of the coal sample tank a (19-1) and the coal sample tank b (19-2), the two pulse electrode plates (10) are connected with a high-voltage power supply (13) through two cables (6), two pulse electrode plates (10) are respectively connected with the positive electrode and the negative electrode of a high-voltage power supply (13), a rectangular container provided with an insulating slide way base (4) is connected with a constant-temperature water tank (12) through a pipeline, water in the constant-temperature water tank can be input into the rectangular container through the pipeline to realize constant-temperature water bath, the water in the rectangular container can be discharged or returned to the constant-temperature water tank (12), the constant-temperature water tank (12) is provided with a temperature sensor (21), a coal sample tank a (19-1) is connected with a moisture tester (1), the coal sample tank a (19-1) is respectively connected with a colored spectrum analyzer (20) and a steel cylinder (7) through the pipeline, the steel cylinder (7) is connected with a pressure gauge (5), a coal sample tank b (19-2) is connected with an inflatable air bag (9) through the pipeline, a valve b (17-2) is arranged at the inlet of the inflatable air bag (9), wherein the coal sample tank a (19 ) Is connected with a storage container (16), the storage container (16) is respectively connected with a pressure sensor (15) and a vacuum pump (18) through pipelines, and the pressure sensor (15) is sequentially connected with a vacuum gauge (8) and a visual monitor (14) through a connecting pipeline (22).
2. The apparatus for measuring the gas diffusion rate under the coal substrate by applying the pulse reinforcement according to claim 1, wherein: a valve a (17-1) is arranged on a pipeline between the coal sample tank a (19-1) and the three-way communicating pipe (11), and a valve c (17-3) is arranged on a pipeline between the coal sample tank b (19-2) and the three-way communicating pipe (11).
3. The apparatus for measuring the gas diffusion rate under the coal substrate by applying the pulse reinforcement according to claim 1, wherein: the steel cylinder (7) is stored with gas, the vacuum pump (18) and the valve d (17-4) form a vacuum pumping device, and the valve d (17-4) is arranged between the storage container (16) and the vacuum pump (18).
4. The apparatus for measuring the gas diffusion rate under the coal substrate by applying the pulse reinforcement according to claim 1, wherein: the pulse electrode plate (10) is made of copper and is characterized in that the thickness of the pulse electrode plate is 4 mm.
5. The apparatus for measuring the gas diffusion rate under the coal substrate by applying the pulse reinforcement according to claim 1, wherein: the height of the pulse electrode plate (10) is higher than that of the coal sample tank.
6. The apparatus for measuring the gas diffusion rate under the coal substrate by applying the pulse reinforcement according to claim 1, wherein: the pressure bearing range of the coal sample tank a (19-1) and the coal sample tank b (19-2) is from vacuum to 20MPa, the temperature range of the constant temperature water tank (12) is from 0 ℃ to 80 ℃, the effective range of the vacuum meter is from 0 to standard atmospheric pressure, and the precision is 1 Pa.
7. A method for measuring the gas diffusion rate by using the apparatus for measuring the gas diffusion rate under the coal substrate according to any one of the preceding claims, comprising the steps of:
firstly, detecting the air tightness of a pipeline, and then respectively filling 5-10g of coal samples into a coal sample tank a (19-1) and a coal sample tank b (19-2);
placing a coal sample tank a (19-1) and a coal sample tank b (19-2) on an insulating base sliding groove (4), arranging insulating protection plates (2) on two sides and the rear of a base of the insulating base sliding groove (4), and opening an electrostatic shielding instrument (3) connected with the lower part of the insulating base sliding groove (4);
after the coal sample tank a (19-1) and the coal sample tank b (19-2) are sealed, all other valves are closed, only the valve d (17-4) is opened, and the vacuum pump (18) is utilized to simultaneously evacuate the coal samples in the coal sample tank a (19-1) and the coal sample tank b (19-2), the connecting pipeline (22) and the air in the storage container (16);
after the vacuumizing is finished, a valve d (17-4) and a vacuum pump (18) are closed in sequence, a visual monitoring device (14) is opened, analysis adsorption analysis, infrared analysis, chromatographic analysis, X-ray diffraction analysis and thermogravimetric analysis are carried out, the gas diffusion process in a coal sample tank a (19-1) and a coal sample tank b (19-2) is monitored and monitored in real time, and relevant dynamic data including coal sample gas components, conductivity, thermal properties, temperature, moisture, adsorption time, adsorption pressure and gas concentration are recorded and analyzed;
a high-voltage power supply (13) is switched on, and pulse waves are transmitted to pulse electrode plates (10) on two sides of a coal sample tank a (19-1) and a coal sample tank b (19-2) through a cable (6);
then opening a valve a (17-1) and a steel cylinder (7) until the coal sample in the coal sample tank a (19-1) and the coal sample tank b (19-2) adsorbs gas to reach equilibrium;
closing a valve (17-1), opening a coal sample tank a (19-1), respectively introducing gas analyzed by the coal sample in the coal sample tank a (19-1) into a chromatographic analyzer (20) and a storage container (16) through a connecting pipeline (22), reading the indication number of a vacuum gauge (8) after 10s, closing the coal sample tank a (19-1) to 35s, opening the coal sample tank (19-1) again, and closing the coal sample tank (19-1) to read the indication number of the vacuum gauge (8) when 60 s;
then, sequentially opening a vacuum pump (18) and a valve d (17-4) until the readings of a vacuum gauge (8) are stable, closing the valve d (17-4) and the vacuum pump (18), opening a valve b (17-2) to start timing, releasing gas analyzed by the coal sample in the coal sample tank b (19-2) to a connecting pipeline (22) and a storage container (16), reading the readings of the vacuum gauge (8) after 0s, closing the coal sample tank b (19-2) to 35s, opening the coal sample tank b (19-2) again, closing the coal sample tank (19-2) when the time reaches 60s, and reading the readings of the vacuum gauge (8);
respectively obtaining values by unit conversion of the difference between two readings
And P, finally, drawing a coal sample gas diffusion process diagram by using a visual monitoring device (14), obtaining the influence trend of different factors on the initial gas diffusion speed of the coal, and analyzing the change rule of the components of the separated gas by using a chromatographic analyzer (20).
8. The method for measuring according to claim 1, wherein: constant temperature water baths with different temperatures are provided for a coal sample tank a (19-1) and a coal sample tank b (19-2) through a constant temperature water tank (12), so that the measurement under different temperatures is realized, a temperature sensor (21) monitors the temperature change in real time, during the experiment of measuring different water content conditions, after the experiment is finished by using coal samples with different water contents, when the water content of the coal sample is measured by using a water analyzer (1) and the adsorbed gas is produced under the normal pressure condition, an inflatable air bag (9) is used as a gas source; and (3) performing adsorption measurement under a very-low pressure condition, using a steel cylinder (7) as a gas source, filling gas into the steel cylinder (7) before adsorption, and filling gas with corresponding concentration into an inflatable air bag (9) when an experiment of gas with different gas concentrations is performed within a pressure range preset by a pressure gauge (5) to finish measurement.
9. The measuring method according to claim 1, wherein the pulse electrode plates (10) are respectively located on both sides of a coal sample tank a (19-1) and a coal sample tank b (19-2), and when there are a plurality of coal sample tanks between the pulse electrode plates (10), the field intensity between the pulse electrode plates (10) is changed by adjusting the voltage of the high voltage power supply.
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Application publication date: 20210611 |
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