CN116429663A - Device and method for measuring radon gas seepage rate in coal-rock medium - Google Patents
Device and method for measuring radon gas seepage rate in coal-rock medium Download PDFInfo
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- 229910052704 radon Inorganic materials 0.000 title claims abstract description 186
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 title claims abstract description 183
- 239000011435 rock Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003245 coal Substances 0.000 claims abstract description 89
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000011068 loading method Methods 0.000 claims description 39
- 238000007789 sealing Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
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- 235000017491 Bambusa tulda Nutrition 0.000 claims 9
- 241001330002 Bambuseae Species 0.000 claims 9
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 9
- 239000011425 bamboo Substances 0.000 claims 9
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- 230000002269 spontaneous effect Effects 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000002474 experimental method Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 88
- 238000005259 measurement Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
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- 230000002265 prevention Effects 0.000 description 2
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- -1 acryl Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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Abstract
The invention relates to the technical field of radon gas transmission experiments in a coal spontaneous combustion goaf overburden layer. An experimental device for measuring radon gas seepage rate in coal rock medium comprises a radon gas source generation system, a gas supply system and a transmission system, wherein radon gas generated in the radon gas source generation system is pressurized by the gas supply system and then is input into an acrylic experimental column filled with coal rock of the transmission system, so that radon gas concentrations corresponding to the coal rock of different heights of the acrylic experimental column are obtained. The invention also relates to a method for measuring the radon gas seepage rate in the coal-rock medium by the device, and the radon gas seepage rate can be obtained through the radon gas concentration. The invention solves the technical problems of insufficient sensitivity and detection limit of measuring the seepage rate of radon gas in coal rock medium, and can realize measuring the seepage rate by knowing the radon gas concentration, thereby being convenient and efficient.
Description
Technical Field
The invention relates to the technical field of radon gas transmission experiments in coal spontaneous combustion goaf cover rock stratum, in particular to a device and a method for measuring radon gas seepage rate in coal rock medium.
Background
Coal has so far also taken a major role worldwide. Along with the increase of the mining intensity and the mining depth of the coal mine, the geological conditions are also more complicated, so that accidents such as mine fire, gas explosion and the like frequently occur. The natural ignition of coal is one of the major natural disasters faced in coal exploitation, and the natural ignition of coal not only can burn coal resources and cause huge economic loss, but also can generate a large amount of harmful gases, seriously pollute air and environment, and also can cause accidents such as gas combustion, dust explosion and the like, so that serious casualties are caused, and the safety production is seriously restricted. The prevention and control of coal fire hazard is not only an important guarantee for coal economic development, but also an important means for realizing the concept of green mountain of Bishui and guaranteeing the exploitation safety. It is therefore necessary to extinguish coal field fires and take preventive effective measures. The accurate detection of the fire source position of a coal field or a goaf is a primary task for preventing and controlling coal fire hazard, and the fire source detection technology has become one of key technologies for mine fire prevention. At present, isotope radon measurement has been widely used for coal fire detection. The radon measurement method can accurately detect the position of the underground coal spontaneous combustion fire source, which is closely related to the long-distance migration process of radon on the overburden layer in the coal spontaneous combustion process. One of the more important studies for radon migration in a medium is the diffusion-percolation theory of radon, the percolation rate being a key parameter in this theory. In order to further develop the isotope radon measurement technology and improve the detection precision, the research on the radon gas migration rule in the overlying strata of the spontaneous combustion goaf of coal is imperative. In order to explore the radon long-distance transport mechanism and construct a complete longitudinal long-distance radon transport model in the coal spontaneous combustion area, the important physical parameter of the radon seepage rate in the overburden stratum needs to be studied in depth. In the aspect of theoretical research, the seepage rate of radon gas in different rock layers under the influence of spontaneous combustion of coal is obtained according to experimental results, the correlation between the concentration distribution of the radon gas on the earth surface and underground fire sources is obtained, a longitudinal long-distance radon gas transmission model of the overlying rock layer in the spontaneous combustion goaf of coal is further simulated, and the longitudinal long-distance radon transmission mechanism of the overlying rock layer in the spontaneous combustion zone of coal is revealed. In practical application, according to the surface radon gas concentration value and the geological structure, the radon gas seepage rate in the overlying strata of the area can be obtained, so that the ignition condition of the spontaneous combustion goaf of the underground coal is judged.
Disclosure of Invention
The invention aims to provide an experimental device and method for measuring radon gas permeation rate in coal-rock medium.
The technical scheme adopted by the invention is as follows: an experimental set-up for measuring radon gas permeation flow rate in a coal rock medium, comprising:
the radon gas source generating system provides stable radon gas used by the experimental device and comprises a roasting furnace 1, a gas collecting tank 2, a first valve 3 and a first radon measuring instrument 4, radon gas is generated after radon-containing rock is heated in the roasting furnace 1, the radon gas generated in the roasting furnace 1 is conveyed into the gas collecting tank 2 through a pipeline with the first valve 3, and the first radon measuring instrument 4 continuously measures the concentration of the radon gas in the gas collecting tank 2;
the air supply system is used for pressurizing radon gas in the air collection tank 2 and then conveying the radon gas to an acrylic experimental column 8 of the transmission system, and comprises an air pump 5, a flowmeter 6 and a first pressure gauge 7, wherein an outlet of the air pump 5 is connected with the air collection tank 2, the air collection tank 2 is connected with the acrylic experimental column 8 through a pipeline, and the flowmeter 6 and the first pressure gauge 7 are arranged on the pipeline connecting the air collection tank 2 and the acrylic experimental column 8;
the transmission system is used for testing radon gas seepage rate and comprises an acrylic experimental column 8 filled with coal rocks, a second pressure gauge 17, a drying pipe 18 and a second radon measuring instrument 19, wherein one or more layers of coal rocks are filled in the acrylic experimental column 8, a plurality of air ducts 14 are led out of the acrylic experimental column 8 corresponding to different heights of the coal rocks, and an air duct cover is correspondingly arranged at the mouth of each air duct 14; in the use process, the airway cover on one airway tube 14 is removed, and then the airway tube 14 is connected with the second radon measuring instrument 19 through a pipeline with the second pressure gauge 17 and the drying pipe 18.
As a preferred way: the acryl experiment column 8 comprises a sample loading barrel 11, a base 16, a porous circular plate 15, an air duct 14, an air duct cover, a sealing cover 9 and a rubber sealing gasket 10, wherein the base 16 is hollow, an air duct 12 connected with the hollow inside is arranged on the side wall of the bottom of the base 16, a second valve is arranged on the air duct 12, the air duct 12 is connected with the air collecting tank 2 through a pipeline, an air outlet connected with the hollow inside is arranged on the upper part of the base 16, the sample loading barrel 11 is a cylinder, the bottom of the sample loading barrel 11 is arranged at the top of the base 16, the porous circular plate 15 is arranged between the sample loading barrel 11 and the base 16, the top of the sample loading barrel 11 is sealed by the sealing cover 9 and the rubber sealing gasket 10, a plurality of air ducts 14 which are different in height and are parallel to the inner side wall of the sample loading barrel 11 are led out, and one or more layers of coal rocks are filled in the sample loading barrel 11.
As a preferred way: the sample loading barrel 11 is a plurality of barrels connected end to end through flanges 13, and isolation nets with a plurality of small holes are arranged between the adjacent barrels.
As a preferred way: the height of each cylinder is 1m, the inner diameter of each cylinder is 0.2m, the distance from the lowest air duct 14 of the sample loading cylinder 11 to the bottom of the sample loading cylinder 11 is 0.2m, and the distance between two adjacent air ducts 14 is 0.2m.
As a preferred way: the mouth of the air duct 14 is provided with internal threads or external threads, the mouth of a pipeline connected with the air duct 14 is provided with external threads or internal threads matched with the air duct 14, and the air duct cover is provided with external threads or internal threads matched with the air duct 14.
A method for measuring radon gas seepage rate in a coal rock medium, which is characterized by comprising the following steps:
checking the air tightness of the experimental device, closing the outlets of all air ducts 14 through an air duct cover, opening a first valve 3 and a second valve, starting an air pump 5 to supply air to an air collection tank 2, closing the air pump 5 when a first pressure gauge 7 reaches a set pressure, observing whether the reading of the first pressure gauge 7 is kept unchanged in a set time, if not, indicating that the reading of the first pressure gauge 7 is unstable, detecting the experimental device and maintaining the experimental device, and then carrying out the step one again until the reading of the first pressure gauge 7 is kept unchanged in the set time, wherein the reading of the first pressure gauge 7 is stable at the moment, and the air tightness of the experimental device is good;
step two, processing an experimental sample, taking out the coal rock experimental sample from the site, classifying according to different coal rocks, sealing by using a plastic film, boxing and transporting to an experimental device, crushing the coal rock experimental sample with larger volume, ensuring that the particle size range of the coal rock experimental sample is controlled to be 1-20 mm, reducing the thickness of different coal rock layers according to the same set proportion according to the thickness of different coal rock layers on the site, filling the coal rock experimental sample into a sample cylinder 11 according to the sequence of the coal rock layers on the site, ensuring that the thickness of the coal rock layer with the smallest thickness in the sample cylinder 11 is greater than 0.2m when the set proportion is set, and then mounting the sample cylinder 11 on a base 16;
step three, removing an air duct cover on an air duct 14, connecting the air duct 14 with a second radon measuring instrument 19 through a pipeline with a second pressure gauge 17 and a drying pipe 18, opening a first valve 3, closing the second valve, adding radon-containing rock into a roasting furnace 1, roasting the radon-containing rock, detecting the concentration of radon gas in an air collecting tank 2 through the first radon measuring instrument 4, closing the first valve 3 when the concentration of radon gas in the air collecting tank 2 is kept unchanged within a set time, opening the second valve, starting an air pump 5, enabling radon gas to enter a sample loading barrel 11 from an air inlet pipe 12 for gas seepage, and adjusting the air outlet quantity of the air pump 5 to ensure that the readings of a flowmeter 6 and the readings of the first pressure gauge 7 are in respective set intervals;
step four, when the value of the second radon measuring instrument 19 changes by less than 5% within 30s, the radon concentration in the acrylic experimental column 8 is considered to be balanced, the values of the second pressure gauge 17 and the second radon measuring instrument 19 at the moment are recorded, the value of the second radon measuring instrument 19 is the radon concentration measured value when the radon concentration of the air duct reaches the balance, and the radon concentration measured value when the radon concentration of the air duct 14 with the required height reaches the balance is obtained by repeating the step three and the step four;
fifthly, radon gas seepage rate of corresponding coal rock at the air duct with the height x
In the present invention, whether the value (meter) is changed within 30 seconds is determined as whether the value is changed within the set time is less than 5%.
The formula derivation process in step five is as follows
Radon concentration formula for known radon diffusion-convection
the radon concentration formula of radon gas diffusion-convection can be obtained, and the height isxRadon gas concentration distribution equation for airway:
The relation between the radon gas seepage rate and the radon gas concentration can be obtained according to the radon gas concentration distribution equation
The beneficial effects of the invention are as follows: the invention can solve the technical problems of insufficient sensitivity and detection limit of the seepage rate of radon gas in coal rock medium, and can realize the measurement of the seepage rate by knowing the radon gas concentration. The invention designs the measuring device for measuring the radon gas seepage rate in the coal-rock medium, and the whole experimental device has the advantages of simple structure, flexible installation and easy assembly and disassembly. The sample loading barrel consists of a plurality of sections (such as 5 sections) of cylinders with different heights, and the flanges are connected through the flanges and can be installed layer by layer and fed in the loading process, so that the loading of the device is facilitated. Meanwhile, the height of the cylinder body of the test device can be flexibly adjusted according to different requirements of each test, and the test conditions under different loading heights are met. Long service life and repeated use.
Drawings
FIG. 1 is a schematic view of the whole experimental device in elevation;
wherein, 1, a roasting furnace, 2, an air collecting tank, 3, a first valve, 4, a first radon measuring instrument, 5, an air pump, 6, a flowmeter, 7, a first pressure gauge, 8, an acrylic experimental column, 9 and a sealing cover, 10, a rubber sealing gasket, 11, a sample loading barrel, 12, an air inlet pipe, 13, a flange, 14, an air guide pipe, 15, a porous circular plate, 16, a base, 17, a second pressure gauge, 18, a drying pipe, 19 and a second radon measuring instrument.
Detailed Description
The following describes the technical scheme of the present invention in detail with reference to fig. 1.
An experimental set-up for measuring radon gas permeation flow rate in a coal rock medium, comprising:
the radon gas source generating system provides stable radon gas used by the experimental device and comprises a roasting furnace 1, a gas collection tank 2, a first valve 3 and a first radon measuring instrument 4.
The roasting furnace 1 can be a sealed electric oven, and is heated through a resistance wire, an electric oven gas outlet is formed in the top of the electric oven, and sealing treatment (comprising an inner cavity and a door) is performed in the electric oven, so that generated gas is prevented from falling from other places outside the electric oven gas outlet.
The gas collection tank 2 is a sealed tank, three ports are formed in the sealed tank, the sealed tank comprises two sealed tank gas inlets and a sealed tank gas outlet, the sealed tank gas inlet is connected with the electric oven gas outlet through a first pipeline, and a first valve 3 is arranged on the first pipeline. The air inlet of the other sealing tank is connected with an air pump 5 in the air supply system through a second pipeline. The air outlet of the sealing tank is connected with an acrylic experimental column 8 (an air inlet pipe of the base) of the transmission system through a third pipeline. The sealed tank is provided with a first radon measuring instrument 4 for measuring the concentration of radon in the sealed tank.
In the present invention, radon gas is generated by heating radon-containing rock. Under the condition that a first valve 3 is opened, the generated radon gas enters a gas collecting tank 2 through a first pipeline, a first radon measuring instrument 4 measures the concentration of the radon gas in the gas collecting tank 2, when the concentration of the radon gas in the gas collecting tank 2 is in a set concentration interval within 30s, the radon gas is in an equilibrium state, the radon gas in the gas collecting tank 2 is stable radon gas, the first valve 3 and the roasting furnace 1 are closed, and the set concentration interval (C 1 -C 2 ) C is dependent on different radon-containing rocks 1 Can meet the minimum concentration of measurement, C 2 The highest concentration measured can be satisfied.
The air supply system is used for pressurizing radon gas in the air collection tank 2 and then conveying the radon gas to an acrylic experimental column 8 of the transmission system and comprises an air pump 5, a flowmeter 6 and a first pressure gauge 7.
The air pump 5 is connected with the air collection tank 2 through a second pipeline, and compressed air provided by the air pump 5 pressurizes radon gas in the air collection tank 2, so that the pressure in the air collection tank 2 in the experimental process meets the experimental requirement.
The gas collection tank 2 (a gas outlet of the sealed tank) is connected with an acrylic experimental column 8 (a gas inlet pipe of the base) through a third pipeline, and the flowmeter 6 and the first pressure gauge 7 are arranged on the third pipeline; the flowmeter 6 and the first pressure gauge 7 are used for measuring the flow and the pressure of the pressurized radon gas.
The transmission system is used for testing radon gas seepage rate and comprises an acrylic experimental column 8 filled with coal and rock, a second pressure gauge 17, a drying pipe 18 and a second radon measuring instrument 19.
The acrylic experimental column 8 comprises a sample loading cylinder 11, a base 16, a porous circular plate 15, an air duct 14, an air duct cover, a sealing cover 9 and a rubber sealing gasket 10.
The inside of base 16 is the frustum cavity, the outside of base 16 is a frustum equally, and the big upper portion of lower part is little frustum is favorable to base 16 keeps stable difficult emergence to empty, the frustum cavity of the inside of base 16 is favorable to keeping the stability of inside gas, the upper portion of base 16 has the hollow gas outlet of frustum of connection inside. The bottom side wall of the base 16 is provided with a hollow air inlet pipe 12 connected with a frustum, the air inlet pipe 12 is provided with a second valve, and the air inlet pipe 12 is connected with the air collection tank 2 (air outlet of the sealed tank) through a third pipeline.
The cartridge 11 is a cylinder, and in this embodiment, the inner diameter of the cartridge 11 is 0.2m. The bottom of the sample loading barrel 11 is mounted on the base 16, and the center line of the sample loading barrel 11 coincides with the center line of the base 16.
The porous circular plate 15 is located between the sample loading barrel 11 and the base 16, and the porous circular plate 15 is used for separating the sample loading barrel 11 and the base 16, so that coal rock loaded in the sample loading barrel 11 is prevented from falling into the base 16.
The top of the sample loading barrel 11 is sealed through the sealing cover 9 and the rubber sealing gasket 10, so that the top of the sample loading barrel 11 is sealed and is prevented from gas leakage, and one or more layers of coal and rock are filled in the sample loading barrel 11.
The sample loading cylinders 11 are 5 cylinders connected end to end through flanges 13, and isolation nets with a large number of small holes are arranged between adjacent cylinders. The height of each cylinder is 1m. A plurality of air ducts 14 which are different in height and communicated with the inside of the sample loading barrel 11 are led out in parallel on the side wall of the sample loading barrel 11. The distance from the lowest air duct 14 of the sample loading barrel 11 to the bottom of the sample loading barrel 11 is 0.2m, and the distance between two adjacent air ducts 14 is 0.2m. The purpose of the isolation net is to provide support for the coal rock, and avoid the weight of the coal rock from being concentrated on the porous circular plate 15, so that the center of the porous circular plate 15 falls down. The sagging of the center of the perforated circular plate 15 may cause measurement inaccuracy.
When not in use, the mouth of each air duct 14 is correspondingly provided with an air duct cover. In the use process, the air duct cover on one air duct 14 is removed, then the air duct 14 is connected with the second radon measuring instrument 19 through a pipeline with the second pressure gauge 17 and the drying pipe 18, and the radon seepage rate of the radon to the coal rock at the height of the air duct 14 is calculated through the obtained pressure and radon concentration of the second pressure gauge 17 and the second radon measuring instrument 19. The purpose of the drying tube 18 is to absorb moisture from the gas and prevent the moisture from interfering with the experiment.
The mouth of the air duct 14 is provided with internal threads, the mouth of a pipeline connected with the air duct 14 is provided with external threads matched with the air duct 14, and the air duct cover is provided with external threads matched with the air duct 14. The air duct 14 is screwed to a fourth duct or duct cover.
A method for measuring radon gas seepage rate in a coal rock medium, comprising the following steps:
step one, checking the air tightness of an experimental device, closing the outlets of all air ducts 14 through an air duct cover, opening a first valve 3 and a second valve, starting an air pump 5 to supply air to an air collection tank 2, closing the air pump 5 when a first pressure gauge 7 reaches 1.5MPa, observing whether the reading of the first pressure gauge 7 changes by less than 5% within 30s, if not, indicating that the reading of the first pressure gauge 7 is unstable, detecting the experimental device and maintaining, and then carrying out step one again until the reading of the first pressure gauge 7 changes by less than 5% within 30s, wherein the reading of the first pressure gauge 7 is stable, and the air tightness of the experimental device is good.
Step two, processing an experimental sample, taking out the coal-rock experimental sample from the site, classifying according to different coal-rock (according to different coal-rock layers), sealing by using a plastic film, boxing and transporting to an experimental device, crushing and processing the coal-rock experimental sample with larger volume, ensuring that the grain size range of the coal-rock experimental sample is controlled to be 1-20 mm, reducing the thickness of different coal-rock layers according to the same set proportion according to the thickness of different coal-rock layers on the site, filling the coal-rock layers into a sample loading cylinder 11 according to the sequence of the on-site coal-rock layers, and layering and processing the materials of each layer to be uniform. When the set proportion is set, the thickness of a coal stratum (any one of sandy mud stratum, powder sandstone stratum, middle sandstone stratum, coal and rock mixed layer and aeolian sand layer) with the smallest thickness in the sample loading barrel 11 is ensured to be larger than 0.2m, the sample loading barrel 11 is filled with coal rocks (coal and rock experimental samples) according to the sequence of the on-site coal strata, and then the sample loading barrel 11 is arranged on the base 16.
Step three, removing an air duct cover on an air duct 14, connecting the air duct 14 with a second radon measuring instrument 19 through a pipeline with a second pressure gauge 17 and a drying pipe 18, opening a first valve 3, closing a second valve, adding radon-containing rock into a roasting furnace 1, roasting the radon-containing rock, detecting the concentration of radon gas in an air collecting tank 2 through the first radon measuring instrument 4, and when the concentration of radon gas in the air collecting tank 2 is within a set concentration interval (C 1 -C 2 ) When radon gas reaches an equilibrium state, the first valve 3 is closed, the second valve is opened, the air pump 5 is started, radon gas enters the sample loading barrel 11 from the air inlet pipe 12 for gas seepage, the air outlet quantity of the air pump 5 is regulated, the pressure of the first pressure gauge 7 is 1.5MPa, and the flow of the flowmeter 6 is 0.5L/min.
And fourthly, when the value of the second radon measuring instrument 19 is kept unchanged (when the change in 30s is less than 5 percent, the radon concentration in the acrylic experimental column 8 is considered to be kept unchanged), the value of the second pressure gauge 17 and the value of the second radon measuring instrument 19 at the moment are recorded, the radon concentration measured value when the radon concentration of the air duct reaches the balance is recorded, and the radon concentration measured value when the radon concentration of the air duct 14 with the required height reaches the balance is obtained by repeating the third step and the fourth step.
Step five, the height isxRadon gas permeation rate of corresponding coal rock at gas guide pipe
The experimental results are shown in table 1.
TABLE 1
According to radon concentration values obtained from the experimental results in table 1, the depth of the rock column is substituted into the radon seepage velocity formula of the coal rock to obtain theoretical radon seepage velocity of different depths, and the results are shown in table 2.
TABLE 2
The above embodiment is a specific embodiment of the present invention, and simple modifications are made on the basis of the embodiment of the present invention, which fall within the protection scope of the present invention.
Claims (7)
1. An experimental apparatus for measuring radon gas seepage flow rate in coal rock medium, characterized by comprising:
the radon gas source generation system provides stable radon gas used by the experimental device and comprises a roasting furnace (1), a gas collection tank (2), a first valve (3) and a first radon measuring instrument (4), radon gas is generated after radon-containing rock is heated in the roasting furnace (1), radon gas generated in the roasting furnace (1) is conveyed into the gas collection tank (2) through a pipeline with the first valve (3), and the first radon measuring instrument (4) continuously measures the concentration of radon gas in the gas collection tank (2);
the air supply system is used for pressurizing radon gas in the air collection tank (2) and then conveying the radon gas to an acrylic experimental column (8) of the transmission system, and comprises an air pump (5), a flowmeter (6) and a first pressure gauge (7), wherein an outlet of the air pump (5) is connected with the air collection tank (2), the air collection tank (2) is connected with the acrylic experimental column (8) through a pipeline, and the flowmeter (6) and the first pressure gauge (7) are installed on a pipeline connecting the air collection tank (2) with the acrylic experimental column (8);
the transmission system is used for testing the radon gas seepage rate and comprises an acrylic experimental column (8) filled with coal rocks, a second pressure gauge (17), a drying pipe (18) and a second radon measuring instrument (19), one or more layers of coal rocks are filled in the acrylic experimental column (8), a plurality of air ducts (14) are led out on the acrylic experimental column (8) corresponding to different heights of the coal rocks, and an air duct cover is correspondingly arranged at the mouth part of each air duct (14); in the use process, the air duct cover on one air duct (14) is taken down, and then the air duct (14) is connected with the second radon measuring instrument (19) through a pipeline with the second pressure gauge (17) and the drying pipe (18).
2. An experimental set-up for measuring radon gas permeation rate in a coal rock medium according to claim 1, wherein: the utility model provides an inferior gram force experimental column (8) is including dress appearance section of thick bamboo (11), base (16), porous plectane (15), air duct (14), air duct lid, sealed lid (9) and rubber seal ring (10), the inside cavity of base (16) has on the bottom lateral wall of base (16) to connect inside hollow intake pipe (12), there is the second valve on intake pipe (12), intake pipe (12) pass through the pipe connection gas collection jar (2), the upper portion of base (16) has the inside hollow gas outlet of connection, dress appearance section of thick bamboo (11) is the drum, the bottom of dress appearance section of thick bamboo (11) is installed the top of base (16), porous plectane (15) are in dress appearance section of thick bamboo (11) with between base (16), the top of dress appearance section of thick bamboo (11) is through sealed lid (9) with rubber seal ring (10) seals, the parallel on the lateral wall of dress appearance section of thick bamboo (11) draw forth many high differences with dress inside of a section of thick bamboo (11) lead to have one and hold a multilayer of a sample section of thick bamboo (14) of thick bamboo (11).
3. An experimental set-up for measuring radon gas permeation rate in a coal rock medium according to claim 2, wherein: the sample loading barrel (11) is a plurality of barrels connected end to end through flanges (13), and isolation nets with a plurality of small holes are arranged between adjacent barrels.
4. An experimental set-up for measuring radon gas permeation rate in a coal rock medium according to claim 3, wherein: the height of each barrel is 1m, the inner diameter of each barrel is 0.2m, the distance from the lowest air duct (14) of the sample loading barrel (11) to the bottom of the sample loading barrel (11) is 0.2m, and the distance between two adjacent air ducts (14) is 0.2m.
5. An experimental set-up for measuring radon gas permeation rate in a coal rock medium according to claim 1, wherein: the mouth of the air duct (14) is provided with internal threads or external threads, the mouth of a pipeline connected with the air duct (14) is provided with external threads or internal threads matched with the air duct (14), and the air duct cover is provided with external threads or internal threads matched with the air duct (14).
6. A method for measuring radon gas permeation rate in a coal rock medium by using the experimental device for measuring radon gas permeation rate in a coal rock medium according to claim 2, which is characterized by comprising the following steps:
checking the air tightness of an experimental device, closing the outlets of all air ducts (14) through an air duct cover, opening a first valve (3) and a second valve, starting an air pump (5) to supply air to an air collection tank (2), closing the air pump (5) when a first pressure gauge (7) reaches a set pressure, observing whether the reading of the first pressure gauge (7) is kept unchanged in the set time, if not, indicating that the reading of the first pressure gauge (7) is unstable, detecting the experimental device and maintaining, and then carrying out the step one again until the reading of the first pressure gauge (7) is kept unchanged in the set time, wherein the reading of the first pressure gauge (7) is stable, and the air tightness of the experimental device is good;
step two, processing an experimental sample, taking out the coal rock experimental sample from the site, classifying according to different coal rocks, sealing by using a plastic film, boxing and transporting to an experimental device, crushing and processing the coal rock experimental sample with larger volume, ensuring that the particle size range of the coal rock experimental sample is controlled to be 1-20 mm, reducing the thickness of different coal rock layers according to the same set proportion according to the thickness of different coal rock layers on the site, filling the coal rock experimental sample into a sample filling cylinder (11) according to the sequence of the on-site coal rock layers, ensuring that the thickness of the coal rock layer with the smallest thickness in the sample filling cylinder (11) is larger than 0.2m when the set proportion is set, and then mounting the sample filling cylinder (11) on a base (16);
step three, taking down an air duct cover on an air duct (14), connecting the air duct (14) with a second radon measuring instrument (19) through a pipeline with a second pressure gauge (17) and a drying pipe (18), opening a first valve (3), closing the second valve, adding radon-containing rock into a roasting furnace (1), roasting the radon-containing rock, detecting the radon gas concentration in the air collecting tank (2) through the first radon measuring instrument (4), closing the first valve (3) when the radon gas concentration in the air collecting tank (2) is kept unchanged within a set time, opening the second valve, starting an air pump (5), and enabling radon gas to enter a sample loading barrel (11) from an air inlet pipe (12) for gas seepage, and adjusting the air outlet quantity of the air pump (5) so that the readings of a flowmeter (6) and the readings of the first pressure gauge (7) are in respective set intervals;
step four, when the value of the second radon measuring instrument (19) changes by less than 5% within 30s, the radon concentration in the acrylic experimental column (8) is considered to be balanced, the values of the second pressure gauge (17) and the second radon measuring instrument (19) at the moment are recorded, the value of the second radon measuring instrument (19) is a radon concentration measured value when the radon concentration of the air duct reaches the balance, and the radon concentration measured value when the radon concentration of the air duct (14) with the required height reaches the balance is obtained by repeating the step three and the step four;
fifthly, radon gas seepage rate of corresponding coal rock at the air duct with the height x
7. A method of measuring radon gas permeation rate in a coal rock medium according to claim 6, wherein: whether the meter value is unchanged within the set time is that whether the meter value is changed by less than 5% within 30 seconds.
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