CN111175178B - Device and method for rapidly and accurately testing coal gas content in cooling manner - Google Patents
Device and method for rapidly and accurately testing coal gas content in cooling manner Download PDFInfo
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- CN111175178B CN111175178B CN202010142996.5A CN202010142996A CN111175178B CN 111175178 B CN111175178 B CN 111175178B CN 202010142996 A CN202010142996 A CN 202010142996A CN 111175178 B CN111175178 B CN 111175178B
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- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 18
- 239000003034 coal gas Substances 0.000 title claims description 4
- 239000003245 coal Substances 0.000 claims abstract description 103
- 238000003795 desorption Methods 0.000 claims abstract description 55
- 238000005192 partition Methods 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 73
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 20
- 235000011089 carbon dioxide Nutrition 0.000 claims description 20
- 238000005485 electric heating Methods 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- VTVVPPOHYJJIJR-UHFFFAOYSA-N carbon dioxide;hydrate Chemical compound O.O=C=O VTVVPPOHYJJIJR-UHFFFAOYSA-N 0.000 claims description 2
- 239000010902 straw Substances 0.000 claims 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
- G01N7/16—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference by heating the material
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Abstract
The device comprises a coal sample tank and a gas desorption instrument, wherein the coal sample tank comprises a tank body with an open top and a cylindrical top, the top of the tank body is provided with a tank cover, a desorption pipe is arranged on the tank cover, a desorption switch valve is arranged on the desorption pipe, an upper port of the desorption pipe is connected with the gas desorption instrument through a hose, the tank body comprises an inner container and a shell with double-layer structures, a disc-shaped cavity is formed between the bottom of the inner container and the bottom of the shell, a cylindrical cavity is formed between the inner container and the circumferential side part of the shell, an annular partition plate is arranged in the cylindrical cavity, a rapid cooling unit is arranged at the lower part of the tank body, and a constant temperature regulating unit is arranged at the upper part of the tank body; the invention has simple structure, convenient operation and strong reliability, can timely reduce the temperature of the coal sample in the coal sample tank, can avoid errors caused by temperature by constant temperature adjustment, can rapidly measure the gas content of coal in different places in the pit on site, and has high accuracy of test results.
Description
Technical Field
The invention belongs to the technical field of coal mine safety production, and particularly relates to a device and a method for rapidly and accurately testing the content of coal gas by cooling.
Background
In the process of 'four-in-one' prevention of coal and gas outburst, two basic parameters which are most important are: gas content and gas pressure. The coal bed gas content and the coal bed gas pressure are measured, so that the coal bed gas extraction effect can be effectively judged, and the method has extremely important significance for preventing coal mine accidents. The gas content of the coal seam is rapidly and accurately measured because the gas pressure error of the coal seam is larger in the process of measuring the gas pressure of the coal seam and can only be inferred by measuring the gas content of the coal seam due to the complexity of the geological structure of the coal seam.
In the process of testing the underground gas desorption rate by using a drainage method, a coal sample tank is a necessary instrument, free gas desorbed from the coal sample tank is displaced out of a water column in a measuring cylinder, the on-site gas desorption amount is obtained by reading the reduction amount of the water column in the measuring cylinder in unit time (namely, the gas desorption rate), and the original gas content of the coal seam is comprehensively obtained according to the calculated gas loss amount and the laboratory test residual gas content.
The following deficiencies exist in determining the gas content of coal: 1. when drilling and sampling are carried out, the temperature of the coal sample is higher due to friction between the drill bit and the coal sample, and the temperature of the coal sample cannot be reduced in time by the coal sample tank; 2. the temperature rise causes the gas desorption speed to be increased, the calculated loss quantity is inconsistent with the actual loss quantity, and the measured gas content error of the coal bed is larger; 3. the traditional method for reducing the temperature of the coal sample in the coal sample tank is that the coal sample is kept in the environment, the sealing and heat dissipation time of the coal sample is long, and the coal sample cannot be rapidly measured underground; 4. the improved coal sample tanks are all improved in temperature rising measures, and the gas content of the coal samples at lower temperature cannot be measured.
Disclosure of Invention
The invention aims to solve the defects in the prior art, provides a device and a method for rapidly and accurately testing the gas content of coal by cooling, and solves the problems that the temperature of a coal sample is extremely high and the temperature of the coal sample cannot be timely reduced by the existing coal sample tank due to friction between a drill bit and the coal sample during on-site sampling in the prior art; meanwhile, the gas desorption error caused by temperature is solved, the time required by heat dissipation is reduced, and the gas content of the coal seam is more favorably measured in the underground on-site.
In order to solve the technical problems, the invention adopts the following technical scheme: the device comprises a coal sample tank and a gas desorption instrument, wherein the coal sample tank comprises a tank body with an open top and a cylindrical top, the top of the tank body is provided with a tank cover, a desorption pipe is arranged on the tank cover, a desorption switch valve is arranged on the desorption pipe, an upper port of the desorption pipe is connected with the gas desorption instrument through a hose, the tank body comprises an inner container and a shell which are of a double-layer structure, a disc-shaped cavity is formed between the bottoms of the inner container and the shell, a cylindrical cavity is formed between the circumferential side parts of the inner container and the shell, an annular partition plate is arranged in the cylindrical cavity, a rapid cooling unit is arranged at the lower part of the tank body, and a constant temperature regulating unit is arranged at the upper part of the tank body;
the quick cooling unit comprises a central cylinder which is concentric with the inner container, the lower end of the central cylinder is fixedly arranged at the bottom of the inner container, a through hole which communicates the inside of the central cylinder with the disc-shaped cavity is formed in the center of the bottom of the inner container, a cylinder cover is connected to the upper end of the central cylinder in a threaded manner, a water filling port and a dry ice injection port which are arranged below the annular partition plate are arranged on the side portion of the shell, a water filling valve is connected to the outer portion of the water filling port, a material door is arranged on the outer portion of the dry ice injection port, a water guide pipe component is connected to the inner side of the water filling port, and a plurality of water outlet holes which are arranged in the cylindrical cavity, the disc-shaped cavity and the inside of the central cylinder are formed in the upper portion of the water guide pipe component.
The water guide pipe assembly comprises a main vertical guide pipe, a circular pipe, a branch vertical guide pipe and a cross pipe, wherein the upper end of the main vertical guide pipe is connected with a water injection port, the circular pipe is horizontally arranged in a disc-shaped cavity, the cross pipe is arranged inside the circular pipe, four ports of the cross pipe are respectively connected with the circular pipe, the lower end of the main vertical guide pipe is fixedly connected with the top of the circular pipe, the branch vertical guide pipe is provided with a plurality of branch vertical guide pipes, one of the upper parts of the branch vertical guide pipes extends into the upper part of a central cylinder, the lower ends of the branch vertical guide pipes extending into the central cylinder are fixedly connected with the central top of the cross pipe, the lower ends of the rest branch vertical guide pipes are fixedly connected with the top of the circular pipe, the upper parts of the branch vertical guide pipes connected to the circular pipe extend upwards into a cylindrical cavity, the inner diameter of the branch vertical guide pipes is smaller than the inner diameter of the main vertical guide pipe, the upper ends of the branch vertical guide pipes are respectively plugged, water outlets are uniformly formed in the main vertical guide pipe, the circular pipe, the branch vertical guide pipes and the cross pipe are uniformly arranged on the top of the outer shell, and a water outlet is arranged on the lower side of the outer shell.
The constant temperature regulating unit comprises an electric heating cylinder arranged in a circular cavity above the annular partition plate, an inner ring of the electric heating cylinder is in contact with an outer circle of the inner container, a heat insulation material is filled in the circular cavity of an outer ring of the electric heating cylinder, a temperature sensor is arranged on the upper surface of the cylinder cover, the temperature sensor and the electric heating cylinder are connected with a temperature control device through control wires, and the temperature control device is connected with a timing device.
The bottom of the inner container is provided with a flat plate type electromagnet around the central cylinder, the outer circle of the magnet disc is sleeved with a magnet disc, the outer circle of the magnet disc is in sliding connection with the inner wall of the inner container, the flat plate type electromagnet is connected with a temperature control device through a wire penetrating through the tank body, the magnetic pole of the lower surface of the magnet disc is the same as the magnetic pole of the upper surface of the flat plate type electromagnet after the flat plate type electromagnet is electrified, and the diameter of a central hole of the magnet disc is smaller than the outer diameter of the cylinder cover.
A method for rapidly and accurately testing the gas content of coal by cooling comprises the following steps:
(1) Opening the tank cover, the cylinder cover and the material door, filling dry ice powder into the cylindrical cavity below the central cylinder and the annular partition plate, connecting a water pipe with a water injection valve, screwing the cylinder cover, and feeding the material door;
(2) Drilling a hole at a to-be-measured point of a mine coal seam, taking out a coal sample of the coal seam in the drilling process, and putting the coal sample into a liner of a tank body, when the coal sample is filled with half of the volume of the liner, screwing up a tank cover, and connecting an upper port of a desorption pipe with a gas desorption instrument through a hose;
(3) The temperature control device is opened, the water injection valve is opened, clean water enters the water guide pipe assembly through the water injection port, the clean water flows out through the water outlet holes on the main vertical guide pipe, the circular ring pipe, the branch vertical guide pipe and the cross-shaped pipe, and when the clean water dry ice powder is mixed, the dry ice sublimates to absorb surrounding heat, so that the temperature of the coal sample is quickly reduced through the liner;
(4) After the temperature sensor monitors that a coal sample temperature signal is transmitted to the temperature control device, when a temperature indication T displayed on a display screen of the temperature control device is equal to the temperature of a coal bed, the water injection valve is closed;
(5) The temperature control device is controlled to enable the flat plate electromagnet to be electrified, and the current is gradually increased, because the magnetic poles on the lower surface of the magnet disc are the same as the magnetic poles on the upper surface of the flat plate electromagnet after the flat plate electromagnet is electrified, the magnet disc moves upwards along the central cylinder by magnetic repulsive force until the magnet disc stops moving upwards after being blocked by the cylinder cover, and the coal sample is pushed into the constant temperature desorption area;
(6) Controlling a temperature control device to electrify an electric heating cylinder, setting the heating temperature of the electric heating cylinder to be the coal bed temperature T, thus regulating the maintenance temperature of the liner to be T at a constant temperature, opening a desorption switch valve when a temperature sensor monitors that the temperature of a coal sample is T, setting unit reminding time T through a timing device, and starting a coal sample underground desorption experiment under the action of a stopwatch;
(7) The free gas desorbed from the liner is displaced out of the water column in the measuring cylinder of the gas desorption instrument, and the on-site gas desorption amount is obtained by reading the water column reduction amount in the measuring cylinder in unit time, namely the gas desorption rate;
(8) Stopping the on-site test when the gas desorption rate per minute is less than 2 ml;
(9) Repeating the steps (1) - (8), and testing the gas content of the coal body at the other position.
By adopting the technical scheme, the invention has the following technical effects:
1. Through the cylinder cavity outside the inner bag of jar body lower part, the inside dry ice powder that fills of the central section of thick bamboo that disc cavity and inner bag central part set up of inner bag bottom below to the aqueduct subassembly that sets up at cylinder cavity/disc cavity and inner bag central part, dry ice sublimation absorbs the heat around when water and dry ice mix and reduces coal sample temperature, and the inside temperature of timely reduction coal sample after the dry ice of the inside dry ice of a connection central section of thick bamboo absorbs water simultaneously, and outer Zhou Yu center cools down simultaneously reaches the temperature that quick reduction coal sample was warmed up in the drilling process.
2. Through set up temperature sensor and through electric heating section of thick bamboo at the inside temperature sensor that sets up of coal sample jar guarantee that the inner bag keeps invariable temperature, the invariable of reading coal sample temperature that can be timely and maintenance coal sample temperature. The method avoids the problem that the gas desorption speed is accelerated due to the fact that the temperature of the traditional coal sample tank is high, the calculated loss amount is inconsistent with the actual loss amount, and the measured coal seam gas content error is large.
3. The timing device and the temperature control device can be fixedly arranged on the lateral part of the outer periphery of the shell, so that the device is convenient to carry, the timing device is provided with a unit time reminding function, the timing of a stopwatch is not required to be manually compared, and a measurer can be reminded to prevent the midway forgetting of reading.
4. The coal sample after being rapidly cooled by the dry ice is electrified by the flat plate type electromagnet to generate magnetism in the inner container, so that the magnet disc and the coal sample on the upper part of the magnet disc are pushed to move upwards into the inner container surrounded by the electric heating cylinder, the coal sample can rapidly enter a heat preservation interval after being cooled, and the coal sample moves in a closed space, so that gas leakage cannot occur.
In conclusion, the invention has the advantages of simple structure, convenient operation and strong reliability, can timely reduce the temperature of the coal sample in the coal sample tank, can avoid errors caused by temperature through constant temperature adjustment, can rapidly measure the gas content of coal at different places in the pit on site, and has high accuracy of test results.
Drawings
FIG. 1 is a schematic view of an axial cross-sectional structure of the present invention;
fig. 2 is a top view of the water conduit assembly.
Detailed Description
As shown in figures 1 and 2, the device for rapidly and accurately testing the content of coal and gas comprises a coal sample tank and a gas desorption instrument, wherein the coal sample tank comprises a tank body with an open top and a cylindrical shape, the top of the tank body is provided with a tank cover 1, a desorption tube 2 is arranged on the tank cover 1, a desorption switch valve 3 is arranged on the desorption tube 2, the upper port of the desorption tube 2 is connected with the gas desorption instrument through a hose, the tank body comprises a liner 4 and a shell 5 which are of a double-layer structure, a disc-shaped cavity 6 is formed between the bottom of the liner 4 and the bottom of the shell 5, a cylindrical cavity 7 is formed between the circumferential side parts of the liner 4 and the shell 5, an annular partition 8 is arranged in the cylindrical cavity 7, a rapid cooling unit is arranged at the lower part of the tank body, and a constant temperature regulating unit is arranged at the upper part of the tank body;
The quick cooling unit comprises a central cylinder 9 which is concentric with the inner container 4, the lower end of the central cylinder 9 is fixedly arranged at the bottom of the inner container 4, a through hole which communicates the inside of the central cylinder 9 with the disc-shaped cavity 6 is formed in the center of the bottom of the inner container 4, a cylinder cover 10 is connected to the upper end of the central cylinder 9 in a threaded manner, a water filling opening and a dry ice filling opening which are arranged below the annular partition plate 8 are arranged on the side portion of the shell 5, at least two dry ice filling openings are arranged in the circumferential direction of the shell 5, a water filling valve 11 is connected to the outside of the water filling opening, a material door 12 is arranged outside the dry ice filling opening, a water guide pipe component is connected to the inner side of the water filling opening, and a plurality of water outlet holes which are arranged in the cylindrical cavity 7, the disc-shaped cavity 6 and the central cylinder 9 are arranged on the upper portion of the water guide pipe component.
The water guide pipe assembly comprises a main vertical guide pipe 13, a circular pipe 14, branch vertical guide pipes 15 and a cross pipe 16, wherein the upper end of the main vertical guide pipe 13 is connected with a water injection port, the circular pipe 14 is horizontally arranged in a circular disk-shaped cavity 6, the cross pipe 16 is arranged in the circular pipe 14, four ports of the cross pipe 16 are respectively connected with the circular pipe 14 correspondingly, the lower end of the main vertical guide pipe is fixedly connected with the top of the circular pipe 14, a plurality of branch vertical guide pipes 15 are arranged, the upper part of one branch vertical guide pipe extends into the upper part of the central cylinder 9, the lower end of the branch vertical guide pipe 15 extending into the central cylinder 9 is fixedly connected with the central top of the cross pipe 16, the lower ends of the rest branch vertical guide pipes 15 are fixedly connected with the top of the circular pipe 14, the upper parts of the branch vertical guide pipes 15 connected with the circular pipe 14 extend upwards into the cylindrical cavity 7, the inner diameter of the branch vertical guide pipes 15 is smaller than the inner diameter of the main vertical guide pipe, the upper ends of the branch vertical guide pipes 15 are respectively blocked, water outlet holes are uniformly formed in the main vertical guide pipe 13, the circular pipe 14, the branch vertical guide pipes 15 and the side parts of the cross pipe 16 are respectively provided with a water outlet 17, and the lower side part of the cross pipe 5 is respectively provided with a water outlet.
The constant temperature regulating unit comprises an electric heating cylinder 18 arranged in a circular cavity above the annular partition plate 8, the inner ring of the electric heating cylinder 18 is in contact with the outer circle of the inner container 4, a heat insulation material 19 is filled in the circular cavity of the outer ring of the electric heating cylinder 18, a temperature sensor 20 is arranged on the upper surface of the cylinder cover 10, the temperature sensor 20 and the electric heating cylinder 18 are connected with a temperature control device through control lines, and the temperature control device is connected with a timing device.
The bottom of the inner container 4 is provided with a flat plate type electromagnet 21 around the central cylinder 9, a magnet disc 22 is sleeved outside the central cylinder 9, the outer circle of the magnet disc 22 is in sliding connection with the inner wall of the inner container 4, the flat plate type electromagnet 21 is connected with a temperature control device through a wire penetrating through a tank body, the magnetic pole of the lower surface of the magnet disc 22 is the same as the magnetic pole of the upper surface of the flat plate type electromagnet 21 after being electrified, and the diameter of a central hole of the magnet disc 22 is smaller than the outer diameter of the cylinder cover 10.
A method for rapidly and accurately testing the gas content of coal by cooling comprises the following steps:
(1) Opening the tank cover 1, the cylinder cover 10 and the material door 12, filling dry ice powder into the cylindrical cavity 7 below the central cylinder 9 and the annular partition plate 8, connecting a water pipe with the water injection valve 11, screwing the cylinder cover 10, and closing the material door 12;
(2) Drilling a hole at a to-be-measured point of a mine coal seam, taking out a coal sample of the coal seam in the drilling process, and putting the coal sample into the inner container 4 of the tank body, wherein when the coal sample is half of the volume of the inner container 4, the tank cover 1 is screwed down, and the upper port of the desorption tube 2 is connected with a gas desorption instrument through a hose;
(3) The temperature control device is opened, the water injection valve 11 is opened, clean water enters the water guide pipe assembly through the water injection port, the clean water flows out through the water outlet holes on the main vertical guide pipe 13, the circular ring pipe 14, the branch vertical guide pipe 15 and the cross-shaped pipe 16, and when clean water and dry ice powder are mixed, the dry ice sublimates to absorb surrounding heat, so that the temperature of a coal sample is quickly reduced through the liner 4;
(4) After the temperature sensor 20 monitors that the temperature signal of the coal sample is transmitted to the temperature control device, when the temperature indication T displayed on the display screen of the temperature control device is equal to the temperature of the coal bed, the water injection valve 11 is closed;
(5) The temperature control device is controlled to electrify the flat electromagnet 21, and the current is gradually increased, because the magnetic pole of the lower surface of the magnet disc 22 is the same as the magnetic pole of the upper surface of the flat electromagnet 21 after being electrified, the magnet disc 22 moves upwards along the central cylinder 9 by magnetic repulsive force until the magnet disc 22 stops moving upwards after being blocked by the cylinder cover 10, and the coal sample is pushed into the constant temperature desorption area;
(6) Controlling a temperature control device to electrify an electric heating cylinder 18, setting the heating temperature of the electric heating cylinder 18 to be the coal seam temperature T, so that the temperature of a constant temperature regulating liner 4 is maintained to be T, when a temperature sensor 20 monitors that the temperature of a coal sample is T, opening a desorption switch valve 3, setting unit reminding time T through a timing device, wherein the timing device is equivalent to the action of a stopwatch, and starting a coal sample underground desorption experiment;
(7) The free gas desorbed from the liner 4 is displaced out of the water column in the measuring cylinder of the gas desorption instrument, and the on-site gas desorption amount is obtained by reading the water column reduction amount in the measuring cylinder in unit time, namely the gas desorption rate;
(8) Stopping the on-site test when the gas desorption rate per minute is less than 2 ml;
(9) Repeating the steps (1) - (8), and testing the gas content of the coal body at the other position.
The temperature control device, the timing device and the gas desorption instrument are all of the prior art, and specific structures are not repeated.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention are all included in the scope of protection of the technical solution of the present invention.
Claims (3)
1. The utility model provides a device of accurate test coal gas content of quick cooling, includes coal sample jar and gas desorption appearance, and the coal sample jar is the jar body of cylinder including the open top, and jar body top is equipped with the cover, is equipped with on the cover and solves the straw, is equipped with desorption ooff valve on the straw, and the port is connected its characterized in that through hose and gas desorption appearance on the straw of solving: the tank body comprises a double-layer inner container and a shell, a disc-shaped cavity is formed between the bottom of the inner container and the bottom of the shell, a cylindrical cavity is formed between the inner container and the circumferential side part of the shell, an annular partition plate is arranged in the cylindrical cavity, a rapid cooling unit is arranged at the lower part of the tank body, and a constant temperature adjusting unit is arranged at the upper part of the tank body;
The rapid cooling unit comprises a central cylinder which is concentric with the inner container, the lower end of the central cylinder is fixedly arranged at the bottom of the inner container, a through hole which communicates the inside of the central cylinder with the disc-shaped cavity is formed in the center of the bottom of the inner container, a cylinder cover is connected at the upper end of the central cylinder in a threaded manner, a water filling port and a dry ice injection port which are positioned below the annular partition plate are arranged at the side part of the shell, a water filling valve is connected to the outside of the water filling port, a material door is arranged outside the dry ice injection port, a water guide pipe component is connected to the inner side of the water filling port, and a plurality of water outlet holes which are positioned in the cylindrical cavity, the disc-shaped cavity and the inside of the central cylinder are formed in the upper part of the water guide pipe component;
The constant temperature adjusting unit comprises an electric heating cylinder arranged in a circular cavity above the annular partition plate, an inner ring of the electric heating cylinder is in contact with an outer circle of the inner container, a heat insulation material is filled in the circular cavity of an outer ring of the electric heating cylinder, a temperature sensor is arranged on the upper surface of the cylinder cover, the temperature sensor and the electric heating cylinder are connected with a temperature control device through control wires, and the temperature control device is connected with a timing device;
The bottom of the inner container is provided with a flat plate type electromagnet around the central cylinder, the outer circle of the magnet disc is sleeved with a magnet disc, the outer circle of the magnet disc is in sliding connection with the inner wall of the inner container, the flat plate type electromagnet is connected with a temperature control device through a wire penetrating through the tank body, the magnetic pole of the lower surface of the magnet disc is the same as the magnetic pole of the upper surface of the flat plate type electromagnet after the flat plate type electromagnet is electrified, and the diameter of a central hole of the magnet disc is smaller than the outer diameter of the cylinder cover.
2. The device for rapidly and accurately testing the gas content of coal by cooling according to claim 1, wherein the device comprises: the water guide pipe assembly comprises a main vertical guide pipe, a circular pipe, a branch vertical guide pipe and a cross pipe, wherein the upper end of the main vertical guide pipe is connected with a water injection port, the circular pipe is horizontally arranged in a disc-shaped cavity, the cross pipe is arranged inside the circular pipe, four ports of the cross pipe are respectively connected with the circular pipe, the lower end of the main vertical guide pipe is fixedly connected with the top of the circular pipe, the branch vertical guide pipe is provided with a plurality of branch vertical guide pipes, one of the upper parts of the branch vertical guide pipes extends into the upper part of a central cylinder, the lower ends of the branch vertical guide pipes extending into the central cylinder are fixedly connected with the central top of the cross pipe, the lower ends of the rest branch vertical guide pipes are fixedly connected with the top of the circular pipe, the upper parts of the branch vertical guide pipes connected to the circular pipe extend upwards into a cylindrical cavity, the inner diameter of the branch vertical guide pipes is smaller than the inner diameter of the main vertical guide pipe, the upper ends of the branch vertical guide pipes are respectively plugged, water outlets are uniformly formed in the main vertical guide pipe, the circular pipe, the branch vertical guide pipes and the cross pipe are uniformly arranged on the top of the outer shell, and a water outlet is arranged on the lower side of the outer shell.
3. A method for rapidly and accurately testing the gas content of coal by cooling, which is operated by the device as claimed in claim 2, and is characterized in that: comprises the steps of,
(1) Opening the tank cover, the cylinder cover and the material door, filling dry ice powder into the cylindrical cavity below the central cylinder and the annular partition plate, connecting a water pipe with a water injection valve, screwing the cylinder cover, and feeding the material door;
(2) Drilling a hole at a to-be-measured point of a mine coal seam, taking out a coal sample of the coal seam in the drilling process, and putting the coal sample into a liner of a tank body, when the coal sample is filled with half of the volume of the liner, screwing up a tank cover, and connecting an upper port of a desorption pipe with a gas desorption instrument through a hose;
(3) The temperature control device is opened, the water injection valve is opened, clean water enters the water guide pipe assembly through the water injection port, the clean water flows out through the water outlet holes on the main vertical guide pipe, the circular ring pipe, the branch vertical guide pipe and the cross-shaped pipe, and when the clean water dry ice powder is mixed, the dry ice sublimates to absorb surrounding heat, so that the temperature of the coal sample is quickly reduced through the liner;
(4) After the temperature sensor monitors that a coal sample temperature signal is transmitted to the temperature control device, when a temperature indication T displayed on a display screen of the temperature control device is equal to the temperature of a coal bed, the water injection valve is closed;
(5) The temperature control device is controlled to enable the flat plate electromagnet to be electrified, and the current is gradually increased, because the magnetic poles on the lower surface of the magnet disc are the same as the magnetic poles on the upper surface of the flat plate electromagnet after the flat plate electromagnet is electrified, the magnet disc moves upwards along the central cylinder by magnetic repulsive force until the magnet disc stops moving upwards after being blocked by the cylinder cover, and the coal sample is pushed into the constant temperature desorption area;
(6) Controlling a temperature control device to electrify an electric heating cylinder, setting the heating temperature of the electric heating cylinder to be the coal bed temperature T, thus regulating the maintenance temperature of the liner to be T at a constant temperature, opening a desorption switch valve when a temperature sensor monitors that the temperature of a coal sample is T, setting unit reminding time T through a timing device, and starting a coal sample underground desorption experiment under the action of a stopwatch;
(7) The free gas desorbed from the liner is displaced out of the water column in the measuring cylinder of the gas desorption instrument, and the on-site gas desorption amount is obtained by reading the water column reduction amount in the measuring cylinder in unit time, namely the gas desorption rate;
(8) Stopping the on-site test when the gas desorption rate per minute is less than 2 ml;
(9) Repeating the steps (1) - (8), and testing the gas content of the coal body at the other position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010142996.5A CN111175178B (en) | 2020-03-04 | 2020-03-04 | Device and method for rapidly and accurately testing coal gas content in cooling manner |
Applications Claiming Priority (1)
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