CN204422365U - The gas porous flow experimental provision of the distribution of dynamic monitoring pore pressure and change - Google Patents
The gas porous flow experimental provision of the distribution of dynamic monitoring pore pressure and change Download PDFInfo
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- CN204422365U CN204422365U CN201520008125.9U CN201520008125U CN204422365U CN 204422365 U CN204422365 U CN 204422365U CN 201520008125 U CN201520008125 U CN 201520008125U CN 204422365 U CN204422365 U CN 204422365U
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Abstract
The utility model discloses the gas porous flow experimental provision of the distribution of dynamic monitoring pore pressure and change, belong to field of coal mining, described experimental provision comprises seepage flow room, described seepage flow room is made up of cylinder body, the piston ram that is arranged on cylinder body top, the chamber that cylinder body and piston ram surround is sample chamber, cylinder side wall is evenly provided with multiple pressure tap from top to bottom, and cylinder base is provided with duct of giving vent to anger; Described piston ram is provided with air inlet port, and air inlet port is connected with draft tube, and draft tube is connected with gas conveyer tube, vacuum lead respectively by T-valve; Described duct of giving vent to anger is connected with gas flow harvester.The experimental provision that the utility model provides can carry out stand under load coal seam with gas Seepage Experiment under the stand under load environment of terrestrial stress and gas pressure residing for simulation coal body, and can the distribution of dynamic monitoring coal sample gas pore pressure and change in experimentation.
Description
Technical field
The utility model belongs to field of coal mining, is specifically related to the gas porous flow experimental provision of the distribution of a kind of dynamic monitoring pore pressure and change.
Background technology
Coal-mine gas disaster accident takes place frequently, one of the most effective Achievements of Gas Control means are exactly gas pumping at present, the efficiency of gas pumping is decided by the complexity that gas flows in coal seam to a great extent, therefore studies coal seam methane control tool and is of great significance.
Scholars have done large quantifier elimination in coal seam coal gas dynamics, Gas Flow theoretical side at present by most scholar what admit is exactly that Darcy's law is deferred in the flowing of gas in coal seam, i.e. the flowing velocity of gas and the proportional relation of methane gas pressure gradient:
Wherein,
vfor the seepage flow element vector of the coal-bed gas of free state;
kfor the permeability of cracks in coal seam system, m
2;
μfor coal seam mash gas dynamic viscosity, Pas; ▽ is Hamiltonian operator;
pfor fissure system dissociates the gaseous tension of coal-bed gas, Pa.Can find out, the change of gas pressure in coal seam and terraced Degree distributions Gas Flow play an important role, and will study just keep away not open Gas Flow process mesoporosity pressure distribution and change this problem the flowing law of coal-bed gas.
But current developed gas porous flow device also has following what time demanding perfection urgently: (1) most device can only carry out the data acquisition of outlet gas flow and carry out observed volume data variation, but can not monitor the pore pressure distribution of experiment coal sample internal gas and change in Gas Flow process, therefore can not obtain the research that intuitive and reliable experimental data affects gas porous flow rule to support pore pressure; (2) equipment majority can only control air admission hole gaseous tension at present, and the direct emptying in equipment gas outlet, can not regulating and controlling gas outlet pressure, cause an admission pressure only to there is a pressure reduction, experiment condition is single, brings inconvenience on gas porous flow impact on research hole gap pressure; (3) for the collection of gas flow data, current equipment or employing drainage are resolved and are carried out artificial reading, or adopt separate unit gas meter.Problem is, too much manual operation can cause too much error, and adopts the flow of separate unit in respect of a range problem, and gas flow change can cause comparatively big error outside range.
Utility model content
The purpose of this utility model is the gas porous flow experimental provision in order to provide a kind of dynamic monitoring pore pressure to distribute and change.
Based on above-mentioned purpose, the utility model is by the following technical solutions: the gas porous flow experimental provision of the distribution of dynamic monitoring pore pressure and change, comprise seepage flow room, described seepage flow room is made up of cylinder body, the piston ram that is arranged on cylinder body top, the chamber that cylinder body and piston ram surround is sample chamber, cylinder side wall is evenly provided with multiple pressure tap from top to bottom, and cylinder base is provided with duct of giving vent to anger; Described piston ram is provided with air inlet port, and air inlet port is connected with draft tube, and draft tube is connected with gas conveyer tube, vacuum lead respectively by T-valve; Described duct of giving vent to anger is connected with data collector.Cylinder side wall is evenly evenly provided with multiple pressure tap from top to bottom, makes this device not only can detect the pressure of seepage flow room import and export, coal sample internal gas pore pressure size and change in Gas Flow process can also be monitored, obtain continuity data.
Described pressure tap has 4, and pressure tap is provided with gas pressure sensor, and gas pressure sensor is connected with computerized data acquisition instrument, and computer automatic data collection can monitor force distribute and change at any time, and reduces the error caused because of manual operation difference.
Described duct of giving vent to anger is connected with escape pipe, and escape pipe is connected with data collector by rapid-acting coupling; Described escape pipe is provided with piston back pressure device, and piston back pressure device and the escape pipe of giving vent to anger between duct are provided with valve and gas outlet, and gas outlet is provided with blowdown valve.Piston back pressure device is set on giving vent to anger, can in Gas Flow process the outlet pressure of Control release system gas outlet, thus regulate coal sample air intake opening and the pressure gradient of gas outlet, the Seepage Experiment under same admission pressure difference pressure differential can be carried out.
Described data collector comprises the arm of four tunnel parallel connections, arm is equipped with pneumatic valve, different from the range respectively mass-flow gas meter of three road arms is wherein connected, 4th road arm is connected with water trap, rising pipe is provided with bottom water trap, the other end of rising pipe is connected to collecting container, and collecting container is placed on electronic balance.Suitable flow can be chosen according to the size of venthole gas flow and measure device, improve the precision of data acquisition.
The range of described mass-flow gas meter is respectively 0 ~ 100mL, 0 ~ 500 mL, 0 ~ 2000 mL.The range of three gas meters adopts gradient design, can meet different data acquisition needs.
Described gas conveyer tube is connected with gas cylinder, and vacuum lead is connected with vacuum pump; Described draft tube is provided with rapid-acting coupling; Described gas conveyer tube is provided with pressure regulator valve, flowmeter, valve successively from gas cylinder; Described vacuum lead is provided with gas outlet, vacuum tank and valve, and gas outlet is provided with blowdown valve.
The cylinder base of described seepage flow room is provided with base.
In sum, the seepage experimental apparatus that the utility model provides is by applying the top hole pressure of axle pressure and change methane gas to coal sample, the Seepage Experiment under the different pressure differential of same admission pressure can be carried out, carry out stand under load coal seam with gas Seepage Experiment under can simulating the stress on the residing ground of coal body and the environment of stand under load gas pressure, and dynamic monitoring coal sample gas pore pressure can distribute and change in experimentation; And adopt various flow rank mass-flow gas meter and drainage electronic balance to carry out flow data collector, can choose according to the size of venthole gas flow and measure flow apparatus, and then improve the precision of data acquisition.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment device.
Embodiment
The gas porous flow experimental provision of the distribution of dynamic monitoring pore pressure and change, comprise seepage flow room, described seepage flow room is by cylinder body 14, the piston ram 13 being arranged on cylinder body 14 top is formed, the chamber that cylinder body 14 and piston ram 13 surround jointly is sample chamber, cylinder body 14 sidewall is evenly provided with multiple pressure tap 22 from top to bottom, is provided with duct of giving vent to anger bottom cylinder body 13; Described piston ram 13 is provided with air inlet port, and air inlet port is connected with draft tube, and draft tube is connected with gas conveyer tube, vacuum lead respectively by T-valve; Described duct of giving vent to anger is connected with data collector.
The seepage flow room cylinder body 14 of experimental provision adopts single port cylindrical mode, cylinder body 14 adopts 316 stainless steels to make, withstand voltage 25MPa, piston ram 13 can apply static pressure to experiment coal sample and load, and simulates the ground stress environment that coal seam is subject to by hydraulic oil pump to the static pressure load that coal sample applies maximum 5000kN.
Described pressure tap 22 has 4, pressure tap 22 is provided with gas pressure sensor 15, and gas pressure sensor 15 is connected with computerized data acquisition instrument.
Described duct of giving vent to anger is connected with escape pipe, and escape pipe is connected with data collector by rapid-acting coupling 18, uses rapid-acting coupling can mount and dismount pipeline quickly and easily; Described escape pipe is provided with piston back pressure device 17, and the escape pipe between piston back pressure device 17 and venthole is provided with valve 11 and gas outlet 12, and gas outlet 12 is provided with blowdown valve.
Described data collector comprises the arm of four tunnel parallel connections, four road arms are equipped with pneumatic valve 23, the mass-flow gas meter 21 that wherein three road arms are different from range is respectively connected, 4th arm is connected with water trap 19, rising pipe is provided with bottom water trap 19, the other end of rising pipe is communicated to collecting container, and collecting container is placed on electronic balance 20.
The range of the mass-flow gas meter that three arms connect is respectively 0 ~ 100mL, 0 ~ 500 mL, 0 ~ 2000 mL, the mass-flow gas meter that three ranges are different and water trap composition data acquisition system, can carry out Auto-matching according to the size of venthole gas flow and choose suitable flow and measure device.
Described gas conveyer tube is connected with gas cylinder 1, and vacuum lead is connected with vacuum pump 4; Described draft tube is provided with rapid-acting coupling 5, can mount and dismount pipeline quickly and easily; Described gas conveyer tube is provided with pressure regulator valve 2, flowmeter 3, valve 9 successively from gas cylinder 4; Described vacuum lead is provided with gas outlet 10, vacuum tank 6 and valve 8, and gas outlet 10 is provided with blowdown valve.
Gas cylinder 1 is the concentration that helium general gas companies in Beijing is produced is 99.999%, and pressure is 13.6MPa high-purity methane gas cylinder.
Base 16 is provided with bottom the cylinder body 14 of described seepage flow room.
The experimental provision dynamic monitoring pore pressure distribution utilizing the utility model to provide and the method for change, comprise the following steps:
(1) utilize methane gas to carry out airtight test to pilot system, guarantee that a whole set of pilot system is air tight; The particulate coal of having sieved is loaded sample chamber by cylinder body 13 upper opening, installation shaft is to piston ram 13, pressed down by piston ram 13 and certain axle pressure is applied to coal sample, open the connection valve 8 between cylinder body 14 and vacuum extractor, open vacuum pump 4 pairs of systems to vacuumize process and show below 20Pa to vacuum gauge pressure 7 and maintain more than three hours, valve-off 8 and then close vacuum pump 4.
(2) the connection valve 9 between coal sample cylinder body and high-pressure air source is opened, the coal sample of sample chamber is filled with to the methane gas of certain pressure, after allowing experiment coal sample fully adsorb and reach adsorption equilibrium, change axial loading stress size, in this process by the change of pressure transducer record coal sample pore pressure, and send data to computing machine so that data are preserved and process.
(3) keep axle pressure constant, under the prerequisite that coal sample is fully adsorbed, open the venthole of cylinder body 14 lower end, regulating piston back pressure device 17, the gas of suitable mass-flow gas meter to outlet is selected to carry out flow measurement, when flow is very little, drainage electronic balance can be selected to measure data on flows; And in Gas Flow process, measured pore pressure distribution and the change of coal sample diverse location by gas pressure sensor 15 on cylinder body 14 sidewall, and flow and pressure data are transferred to computing machine.
Claims (7)
1. the gas porous flow experimental provision of dynamic monitoring pore pressure distribution and change, comprise seepage flow room, it is characterized in that, described seepage flow room is made up of cylinder body, the piston ram that is arranged on cylinder body top, the chamber that cylinder body and piston ram surround is sample chamber, cylinder side wall is evenly provided with multiple pressure tap from top to bottom, and cylinder base is provided with duct of giving vent to anger; Described piston ram is provided with air inlet port, and air inlet port is connected with draft tube, and draft tube is connected with gas conveyer tube, vacuum lead respectively by T-valve; Described duct of giving vent to anger is connected with data collector.
2. gas porous flow experimental provision according to claim 1, is characterized in that, described pressure tap has 4, and pressure tap is provided with gas pressure sensor, and gas pressure sensor is connected with computerized data acquisition instrument.
3. gas porous flow experimental provision according to claim 1 and 2, is characterized in that, described in give vent to anger on duct and be connected with escape pipe, escape pipe is connected with data collector by rapid-acting coupling; Described escape pipe is provided with piston back pressure device, and piston back pressure device and the escape pipe of giving vent to anger between duct are provided with valve and gas outlet, and gas outlet is provided with blowdown valve.
4. gas porous flow experimental provision according to claim 3, it is characterized in that, described data collector comprises the arm of four tunnel parallel connections, arm is equipped with pneumatic valve, different from the range respectively mass-flow gas meter of three road arms is wherein connected, and the 4th road arm is connected with water trap, is provided with rising pipe bottom water trap, the other end of rising pipe is connected to collecting container, and collecting container is placed on electronic balance.
5. gas porous flow experimental provision according to claim 4, is characterized in that, the range of described mass-flow gas meter is respectively 0 ~ 100mL, 0 ~ 500 mL, 0 ~ 2000 mL.
6. gas porous flow experimental provision according to claim 1, is characterized in that, described gas conveyer tube is connected with gas cylinder, and vacuum lead is connected with vacuum pump; Described draft tube is provided with rapid-acting coupling; Described gas conveyer tube is provided with pressure regulator valve, flowmeter, valve successively from gas cylinder; Described vacuum lead is provided with gas outlet, vacuum tank and valve, and gas outlet is provided with blowdown valve.
7. gas porous flow experimental provision according to claim 1, is characterized in that, the cylinder base of described seepage flow room is provided with base.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520008125.9U CN204422365U (en) | 2015-01-07 | 2015-01-07 | The gas porous flow experimental provision of the distribution of dynamic monitoring pore pressure and change |
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| CN201520008125.9U CN204422365U (en) | 2015-01-07 | 2015-01-07 | The gas porous flow experimental provision of the distribution of dynamic monitoring pore pressure and change |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535455A (en) * | 2015-01-07 | 2015-04-22 | 河南理工大学 | Gas seepage experiment device and method for dynamically monitoring pore pressure distribution and changes |
| CN106840991A (en) * | 2016-12-07 | 2017-06-13 | 中国矿业大学 | A kind of many PROCESS COUPLING pilot systems of Unconventional gas rock gas heat |
-
2015
- 2015-01-07 CN CN201520008125.9U patent/CN204422365U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535455A (en) * | 2015-01-07 | 2015-04-22 | 河南理工大学 | Gas seepage experiment device and method for dynamically monitoring pore pressure distribution and changes |
| CN106840991A (en) * | 2016-12-07 | 2017-06-13 | 中国矿业大学 | A kind of many PROCESS COUPLING pilot systems of Unconventional gas rock gas heat |
| CN106840991B (en) * | 2016-12-07 | 2019-04-23 | 中国矿业大学 | A kind of Unconventional gas rock-more PROCESS COUPLING pilot systems of gas-heat |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20160107 |