CN207636453U - CO in loose coal2Osmosis system measurement device - Google Patents
CO in loose coal2Osmosis system measurement device Download PDFInfo
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- CN207636453U CN207636453U CN201721808388.3U CN201721808388U CN207636453U CN 207636453 U CN207636453 U CN 207636453U CN 201721808388 U CN201721808388 U CN 201721808388U CN 207636453 U CN207636453 U CN 207636453U
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- pressure
- gas chamber
- testing tube
- carbon dioxide
- conveyance conduit
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Abstract
The utility model discloses CO in a kind of loose coal2The output port of osmotic coefficient investigating device, including carbon dioxide storage tank, carbon dioxide storage tank is provided with conveyance conduit, and pressure-regulating valve, pressure gauge, flow control valve and flowmeter have been set gradually from left to right on conveyance conduit；The conveyance conduit of flowmeter right end is connected with gas chamber, and the right side of gas chamber is connected with testing tube by copper mesh, which can test migration rule of the carbon dioxide in loose coal under different pressures, grain size, porosity, temperature many condition；Multiple pressure sensors are arranged in testing tube, and research test overpressure is facilitated to progressively reach in equilibrium process and migration rule of the carbon dioxide in testing tube.
Description
Technical field
The utility model is related to CO2Osmosis system determination techniques field, more particularly to carbon dioxide in a kind of loose coal
Osmotic coefficient investigating device.
Background technology
In nature, there are three kinds of phases of gas, liquid, solid for carbon dioxide, with the variation of environmental pressure and temperature, titanium dioxide
Carbon will be undergone phase transition, and the transfer of energy occurs.In phase transition process, the stage of another phase is fully converted to by a kind of phase
It is then unsaturation multiphase state.China's coal spontaneous combustion disaster is serious, and the key administered is to block the oxidation of coal and removes heat.
In existing preventing and extinguishing fire technology, the prevention of coal spontaneous combustion is directly carried out using liquid carbon dioxide, is had both fire-retardant, explosion arrestment performance same
When also have and significant hypothermal effect and do not damage coal quality, the prevention of spontaneous fire is more advantageous to, especially to closing fire on a large scale
The improvement in area has good effect.Liquid carbon dioxide discharges in the loose coals environment such as goaf, Fragmentation Coal Pillar, dump
Afterwards, due to the variation of pressure and environment, liquid carbon dioxide is undergone phase transition rapidly, forms the carbon dioxide gas of unsaturation multi phase state
Body, seepage flow and migration in loose coal, and along with mass-and heat-transfer process.The seepage flow and migration for grasping multiphase carbon dioxide are advised
Rule is then the basis for analyzing its mass-and heat-transfer process.Therefore the seepage flow and migration rule to multiphase carbon dioxide in loose media
Research be the key that liquid carbon dioxide cooling fire-fighting technique application.
It is the percolation law for testing single gas phase state carbon dioxide in existing test method and device, it is not right
Under different pressures, grain size, temperature, porosity multiple variable synthetical factor, multiphase carbon dioxide seepage flow and migration rule in loose coal
The test and research of rule；Simultaneously in existing research method, the method for computer simulation is mostly used to single phase gas in loose coal
It is studied, the method that physical testing is not taken to multi-phase gas.
Utility model content
The utility model devises a kind of CO2Osmotic coefficient investigating device, has studied CO2Multi-phase gas is situated between in loose coal
Percolation law and Diffusion Law in matter under the conditions of different Pressure Castings, coal body grain size, voidage.
The utility model provides CO in a kind of loose coal2Osmotic coefficient investigating device, including carbon dioxide storage tank, institute
The output port for stating carbon dioxide storage tank is provided with conveyance conduit, and pressure tune has been set gradually from left to right on the conveyance conduit
Save valve, pressure gauge, flow control valve and flowmeter；The conveyance conduit of the flowmeter right end is connected with gas chamber, the gas chamber
Right side is connected with testing tube by copper mesh, and the first temperature sensor and pressure sensor are provided in the testing tube, described
The right side of testing tube is connected with gas chamber also by copper mesh, and the right side of the gas chamber is connected with outlet valve by conveyance conduit；
The gas chamber and testing tube are arranged in water bath, and heater strip and temperature sensor are additionally provided in the water bath；It is described
Pressure transmitter is provided with above water bath, the left end connection of the pressure transmitter is located at the gas chamber on the left of testing tube, institute
State gas chamber of the right end connection of pressure transmitter on the right side of testing tube；The pressure gauge, flow meter pressure transmitter, pressure pass
Heater strip is connect by conducting wire with Computer signal in turn for sensor, the first temperature sensor, second temperature sensor.
Preferably, the pressure sensor at least there are four.
The utility model measurement device can test the titanium dioxide under different pressures, grain size, porosity, temperature many condition
Migration rule of the carbon in loose coal；Multiple pressure sensors are arranged in testing tube, facilitate research test overpressure by
Step reaches in equilibrium process and migration rule of the carbon dioxide in testing tube.
Description of the drawings
Fig. 1 is CO in a kind of loose coal provided by the utility model2Osmotic coefficient investigating apparatus structure schematic diagram；
Fig. 2 is CO in loose coal2Osmotic coefficient investigating flow chart.
Reference sign：
1, carbon dioxide storage tank；2, pressure-regulating valve；3, pressure gauge；4, flow control valve；5, flowmeter；6, pressure inverting
Device；7, water bath；8, gas chamber；9, copper mesh；10, testing tube；11, the first temperature sensor；12, pressure sensor；13, it exports
Valve；14, computer；15, second temperature sensor；16, heater strip.
Specific implementation mode
Below in conjunction with the accompanying drawings, a specific implementation mode of the utility model is described in detail, it is to be understood that this
The protection domain of utility model is not restricted by specific implementation.
As shown in Figure 1, the utility model embodiment provides CO in a kind of loose coal2Osmotic coefficient investigating device, packet
Carbon dioxide storage tank 1 is included, carbon dioxide storage tank is for providing carbon dioxide source, the output port setting of carbon dioxide storage tank 1
There is conveyance conduit, pressure-regulating valve 2, pressure gauge 3, flow control valve 4 and flow have been set gradually from left to right on conveyance conduit
Meter 5, pressure-regulating valve is for controlling carbon dioxide output pressure, and pressure gauge is for monitoring carbon dioxide output pressure, flow tune
It saves valve and is used for regulation of carbon dioxide output flow, flowmeter is for monitoring carbon dioxide output flow；The conveying of 5 right end of flowmeter
Pipeline is connected with gas chamber 8, and gas chamber is convenient for pressure sensor monitoring testing tube both ends steady pressure, the right side of the gas chamber 8 and test
Pipe 10 is connected to, and the junction of gas chamber 8 and testing tube 10 is provided with copper mesh 9, and copper mesh is for preventing coal sample in testing tube from entering
In transfer pipeline in gas chamber；The first temperature sensor 11 and pressure sensor 12 are provided in testing tube 10, testing tube 10
Right side is also connected with gas chamber 8, is also equipped with copper mesh in the junction of the two, the right side of gas chamber 8 is connected with by conveyance conduit
Outlet valve 13；Gas chamber 8 and testing tube 10 are arranged in water bath 7, and water bath is for keeping constant test temperature in testing tube
It spends, heater strip 16 and temperature sensor 15, control heater strip heating is additionally provided in water bath 7, then supervise by temperature sensor
The temperature in water bath is surveyed, so as to so that the temperature in water bath keeps constant temperature；Pressure transmitter connecting test pipeline both ends
Gas chamber is used for monitoring and test pipeline both ends pressure difference；Water bath is used to keep constant testing temperature water bath 7 in test pipeline
Side is provided with pressure transmitter 6, and pressure transmitter is used for monitoring and test pipeline both ends pressure difference, and the left end of pressure transmitter 6 connects
Gas chamber 8 positioned at 10 left side of testing tube, the right end connection of pressure transmitter 6 are located at the gas chamber 8 on 10 right side of testing tube；Pressure gauge 3,
5 pressure transmitter 6 of flowmeter, pressure sensor 12, the first temperature sensor 11, second temperature sensor 15 and then heater strip 16
It is connect with 14 signal of computer by conducting wire.
In the present invention, by computer settings water bath predetermined temperature, computer starting heater strip is to water bath
Heating schedule is carried out, when second temperature sensor detects that water bath temperature is more than 3 DEG C of preset temperature, computer closes heating
Silk；When second temperature sensor detects water bath temperature less than 3 DEG C of preset temperature, computer starting heater strip is to water bath
It is heated, ensures that water bath temperature is always held at 3 DEG C or so of preset temperature or more with this, be then measured experiment.
In the utility model embodiment, pressure sensor 12 at least there are four.
CO in the loose coal2Osmotic coefficient investigating method, concrete principle are as follows：
(1) sample coal is prepared：Sample coal is crushed to certain granularity, it is different by extrusion packing to testing tube, obtaining
Voidage；
(2) experimental provision is connected：Outlet valve is opened, goes out to connect return pump in outlet valve, simultaneously closes off flow-rate adjustment
Valve starts return pump and testing tube is vacuumized；
(3) start to test when the vacuum meter reading on return pump maintains -0.1MPa always in 0.5h；
(4) water bath temperature is set：Wait for that water bath temperature is stablized, when the first temperature sensor temperature reaches predetermined temperature,
Open the valve on carbon dioxide storage tank；
(5) inlet pressure is set：The pressure in conveyance conduit is set by pressure-regulating valve；
(6) it measures under different flow, each pressure spot variation, until test overpressure reaches balance, and remembers in testing tube
Pressure difference in testing tube when recording pressure balance；
(7) change inlet pressure；Repeat step 6；
(8) change water bath temperature, repeat step 5 and 6, while inserting the coal sample of different-grain diameter into testing tube, in turn
Different temperatures, different voidage CO can be measured2Infiltration coefficient.
Specifically, CO in loose coal2Osmotic coefficient investigating method is：
The non linear fluid flow through porous medium theoretical equation suitable for General Filtration behavior is proposed according to Forchheimer：
In formula, P is pressure, Pa；μ is the dynamic viscosity of fluid, and kg/ (ms), u are seepage flow speed, and k is permeability, m/
S, β are the non-darcy factor, m-1；ρ is the density of fluid, kg/m3
CO2Percolation flow velocity is calculated by following formula in loose coal container：
In formula：Q is the flow of gas, ml/s；R is the radius of container, m
Wherein, Q is that flowmeter 5 measures flow value, and CO is adjusted by flow control valve 42Feed flow；
Barometric gradient can be indicated with formula 3：
P1、P2The respectively pressure at container both ends, Pa；L is the length of container, m.
Wherein, P2-P1For test pipeline both ends pressure difference, obtained by pressure transmitter 6；
(3) substitution (1) can be obtained：
Due to the CO of release2Gas meets gas perfect condition equation：
PV=znRT
(5) in formula, V is the volume of perfect gas, and n indicates the amount of gaseous matter, and T then indicates the heating power of perfect gas
Learn temperature；R is ideal gas constant, 8.314J/ (molK).
Wherein, T is temperature in test pipeline, is obtained by second temperature sensor 15；It can be adjusted simultaneously by water bath
Test pipeline medium temperature degree；
According to mass-conservation equation：
ρ Q=ρpQp
(6)
Wherein, ρ indicates averag density；Q indicates average flow rate；ρpIndicate measuring point atmospheric density；QpIndicate measuring point flow.
Density formula：
Container inner pressure is set asComposite type 4,5,6,7 and 8, obtains the calculation formula of coal sample permeability：
In formula, M CO2Molal weight kg/mol；A is cross-sectional area, m2；Z is air compressibility factor；R is moles of gas
Constant R=8.314J/ (molk)；μ is coefficient of kinetic viscosity；P1、P2The pressure at two ends that pressure difference is tested under different percolation flow velocities.
The seepage theory of porous media is quoted to derive CO2Then percolation law in loose coal is surveyed by testing
Its fixed infiltration coefficient and the non-darcy factor.It, will using formula (8)It is defined as x, by formula left endXiang Ding
Justice is at Y.Then obtain linear equationNon- darcy factor-beta is found out using slope of a curve, so as to utilize y-axis
Intercept finds out permeability k.
By adjusting pressure-regulating valve 2, so that it may to test CO under different pressures2Infiltration coefficient in loose coal and fortune
Move rule；Change loose coal grain size in test container, so that it may to test the CO under different-grain diameter2Infiltration coefficient and migration rule
Rule；Container is filled by squeezing coal body, obtains CO under different voidages2Infiltration coefficient and migration rule；Adjust water-bath box temperature
Degree, so that it may to test the CO under different temperatures2Infiltration coefficient and migration rule.
In conclusion carbon dioxide permeability factor detection device in the loose coal that the utility model embodiment provides, it can
To test migration rule of the carbon dioxide under different pressures, grain size, porosity, temperature many condition in loose coal；It is surveying
The multiple pressure sensors of arrangement in test tube facilitate research test overpressure to progressively reach in equilibrium process and carbon dioxide
Migration rule in testing tube.
Disclosed above is only several specific embodiments of the utility model, and still, the utility model embodiment is not office
It is limited to this, the changes that any person skilled in the art can think of should all fall into the scope of protection of the utility model.
Claims (2)
1. CO in loose coal2Osmotic coefficient investigating device, which is characterized in that including carbon dioxide storage tank (1), the titanium dioxide
The output port of carbon storage tank (1) is provided with conveyance conduit, and pressure-regulating valve has been set gradually from left to right on the conveyance conduit
(2), pressure gauge (3), flow control valve (4) and flowmeter (5)；
The conveyance conduit of flowmeter (5) right end is connected with gas chamber (8), and the right side of the gas chamber (8) is connected by copper mesh (9)
It is connected to testing tube (10), the first temperature sensor (11) and pressure sensor (12) are provided in the testing tube (10), it is described
The right side of testing tube (10) is connected with gas chamber (8) also by copper mesh (9), and the right side of the gas chamber (8) is connected by conveyance conduit
It is connected to outlet valve (13)；
The gas chamber (8) and testing tube (10) are arranged in water bath (7), and heater strip is additionally provided in the water bath (7)
(16) and temperature sensor (15)；
Pressure transmitter (6) is provided with above the water bath (7), the left end connection of the pressure transmitter (6), which is located at, surveys
The right end connection of gas chamber (8) on the left of test tube (10), the pressure transmitter (6) is located at the gas chamber (8) on the right side of testing tube (10)；
The pressure gauge (3), flowmeter (5) pressure transmitter (6), pressure sensor (12), the first temperature sensor (11),
Two temperature sensors (15) and then heater strip (16) is connect by conducting wire with computer (14) signal.
2. CO in loose coal as described in claim 12Osmotic coefficient investigating device, which is characterized in that the pressure sensor
(12) there are four at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721808388.3U CN207636453U (en) | 2017-12-21 | 2017-12-21 | CO in loose coal2Osmosis system measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721808388.3U CN207636453U (en) | 2017-12-21 | 2017-12-21 | CO in loose coal2Osmosis system measurement device |
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| Publication Number | Publication Date |
|---|---|
| CN207636453U true CN207636453U (en) | 2018-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721808388.3U Expired - Fee Related CN207636453U (en) | 2017-12-21 | 2017-12-21 | CO in loose coal2Osmosis system measurement device |
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| CN (1) | CN207636453U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976395A (en) * | 2017-12-21 | 2018-05-01 | 西安科技大学 | CO in loose coal2Osmosis system measurement device and its method |
| CN112417663A (en) * | 2020-11-13 | 2021-02-26 | 重庆大学 | Method for representing coal bed gas migration path in extraction process of coal mining stable area |
-
2017
- 2017-12-21 CN CN201721808388.3U patent/CN207636453U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976395A (en) * | 2017-12-21 | 2018-05-01 | 西安科技大学 | CO in loose coal2Osmosis system measurement device and its method |
| CN107976395B (en) * | 2017-12-21 | 2024-05-03 | 西安科技大学 | CO in bulk coal2Osmotic system measuring device and method thereof |
| CN112417663A (en) * | 2020-11-13 | 2021-02-26 | 重庆大学 | Method for representing coal bed gas migration path in extraction process of coal mining stable area |
| CN112417663B (en) * | 2020-11-13 | 2022-09-20 | 重庆大学 | Method for representing coal bed gas migration path in extraction process of coal mining stable area |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180720 Termination date: 20191221 |