CN108303509A - The amendment that coal-bed gas free amount calculates and remaining absorption amount determining device and method - Google Patents
The amendment that coal-bed gas free amount calculates and remaining absorption amount determining device and method Download PDFInfo
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- CN108303509A CN108303509A CN201810012086.8A CN201810012086A CN108303509A CN 108303509 A CN108303509 A CN 108303509A CN 201810012086 A CN201810012086 A CN 201810012086A CN 108303509 A CN108303509 A CN 108303509A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The amendment calculated the present invention relates to a kind of coal-bed gas free amount and remaining absorption amount determining device and method, belong to technical field of mine safety, which includes absorption tank body, gas pressure reducer, Roots vaccum pump, gas pressure regulating valve, air accumulator；Absorption tank body is arranged for storing coal sample, absorption tank body in a constant temperature air bath environment, and rotating platform is equipped with below absorption tank body；The x-ray source and ray detector of face absorption tank body are installed in constant temperature air bath, ray detector is connected to data acquisition and analysis system, air accumulator is connected to gas pressure regulating valve, the other end of gas pressure regulating valve is connected to the first port of triple valve, and the second port of triple valve is connected to air source by gas needle valve I and gas pressure reducer；The third port of triple valve is connected to Roots vaccum pump by gas needle valve II.The present invention realizes coal sample porosity, accurate measurement of free gas content under different gas pressures, different loaded conditions.
Description
Technical field
The invention belongs to technical field of mine safety, are related to a kind of amendment that coal-bed gas free amount calculates and remaining absorption
Amount determining device and method.
Background technology
Coal mine gas (also known as " coal bed gas ") is preservation in coal seam and its country rock, is existed with absorption or free state
, with methane Unconventional gas as main component.China's coal bed gas resource is abundant, according to known to new round of resources evaluation：I
2000 meters of state is about 36.81 tcms with shallow Coal bed gas project, is equivalent to 49,000,000,000 tons of standard coals, arranges third place in the world
Position.Recently as the raising of quickening and the environmental protection requirement of Urbanization in China, natural gas is as a kind of clean and effective
The energy, be largely used in the industrial fuels such as city gas and Substitute coal, fuel oil.During 2005 to 2015, China
Natural gas output rises to 1350 billion cubic meters by 493 tcms, and consumption figure rises to 193,100,000,000 by 468 billion cubic meters
Cubic meter, Compound Annual Growth Rate is respectively 10.6% and 15.2% within 10 years.It follows that the Natural Gas Consumption Using in China lacks
Mouth is constantly increasing, and increases the dynamics of coalbed gas in coal mine area exploration and development, helps to alleviate China's natural gas situation in short supply.
Gas in coal seam mainly in the form of " absorption " and " free " preservation in the hole of coal, fissure system.Middle low-order coal hole
Degree is typically much deeper than high rank coal, and is wherein conducive to macropore, the mesopore content height that free gas exists and coal bed gas circulates, Gao Zhe
40% or more is can reach, and is taken advantage with the strong hole of the adsorption capacities such as micropore, aperture in high rank coal, the two coal hole hair
Feature difference is educated, causing air content to constitute, there is also differences.Practical coal seam is in certain gas pressure field, stress field and temperature
It spends in field, therefore the hole of coal will be influenced by gas pressure, stress and temperature coupling.Currently, China generally uses《Coal
With physical-mechanical properties of rock assay method》In the Sealing Method enumerated or volumetric method measure the block density of coal, using specific gravity bottle
The real density of method or gas expansion method real density analysis-e/or determining coal, and then calculate the porosity of coal.This kind of method can be accurate
Measurement coal sample without the porosity under the conditions of gas, but there are strong suction-operated, different watts between coal and methane gas
This pressure will cause coal sample that different deformations occurs.It is existing practice have shown that：Even if under the conditions of lower gas pressure, coal is inhaled
The deformation that attached gas causes causes the opposite variation of its porosity maximum up to 17.98%.Therefore, meter and gas pressure, crustal stress
The mapping principle of temperature and coal porosity is modified the computational methods of coal-bed gas free amount, Fang Kewei based on this
The evaluation of reservoir coal bed gas resource provides accurate foundation.Simultaneously as coal belongs to a kind of special porous media, complicated hole knot
Structure so that absorption and nonideal physical absorption of the gas in coal body.The achievement in research for having many scholars shows：Different watts
Coal adsorbance curve and amount of diffusin curve under this balance pressure are simultaneously misaligned, i.e.,：Same coal sample is bent to the isothermal desorption of gas
There are the remaining adsorbances under a deficient pressure with adsorption isothermal curve for line.
Invention content
In view of this, the purpose of the present invention is to provide a kind of amendments of coal-bed gas free amount calculating and remaining adsorbance
Measurement device and method solve not considering that gas pressure, crustal stress are coupled with temperature in coal-bed gas free amount calculating process
The problem of effect influences coal porosity carries for the solution formulation of coalbed gas in coal mine area development project and the evaluation of reservoir coal bed gas resource
For accurate scientific basis.
In order to achieve the above objectives, the present invention provides the following technical solutions：
The amendment that coal-bed gas free amount calculates includes absorption tank body, gas with remaining absorption amount determining device, the device
Pressure reducing valve, Roots vaccum pump, gas pressure regulating valve, air accumulator；
The absorption tank body is provided with sealing block, upper sealing block connection for storing coal sample, absorption tank body upper end
To forcing press, lower end is connected to absorption tank body bottom tray by connecting flange, is provided in the absorption tank body bottom tray
Gas stream connects mouth；
One end of the air accumulator is connected to absorption tank body, and absorption tank body is arranged in a constant temperature air bath environment, absorption
Rotating platform is installed below tank body；
The x-ray source and ray detector of face absorption tank body are installed in constant temperature air bath, ray detector connects
It is connected to data acquisition and analysis system, the gentle body of gas mass flow gauge is provided on absorption tank body and the tank connected pipeline of gas storage
Pressure sensor II；
The other end of air accumulator is connected to one end of gas pressure regulating valve, and the other end of gas pressure regulating valve is connected to
The second port of the first port of one triple valve, the triple valve is connected to air source by gas needle valve I and gas pressure reducer；
The third port of the triple valve is connected to Roots vaccum pump by gas needle valve II.
Further, it is provided with gas pressure sensor I between the front and back end of the air accumulator, is gone back on the Roots vaccum pump
It is provided with vacuum thermocouple meter, outlet valve is additionally provided on one end that the air accumulator is connect with absorption tank body.
Further, it is arranged fluted on the connecting flange, the absorption tank body upper end is additionally provided with sealing ring.
Further, the rotating platform is arranged in multi-spindle machining mobile device, the multi-spindle machining mobile device setting
On optical table.
The amendment that coal-bed gas free amount calculates is comprised the following steps with remaining absorption quantity measuring method, this method：
S1：It prepared by the coal sample drilled through is molded, then polished coal sample surface using sand paper, make its surfacing；
S2：The coal sample prepared is placed in vacuum drying chamber, processing is dried, then the size of coal sample is surveyed
Amount；
S3：The manifold volume connected to air accumulator and its between absorption tank body is demarcated, and record gas storage tank volume is
Vc, the manifold volume connected between air accumulator and absorption tank body is Vg；
S3：Coal sample is put into adsorption tanks body, absorption tank body is sealed, Opening pressure machine makes sealing block produce
Raw displacement, and being contacted with coal sample upper surface, then closes forcing press, sealing block is made to stop movement, upper sealing block with
Felt is placed between the upper surface of coal sample, record felt volume is Vm, the volume for recording absorption tank body at this time is Vx0；
S4：After adsorbing tank body sealing, gas needle valve II is opened, gas needle valve I is closed, by vacuum pump to whole
A tank body and pipeline are de-gassed；
S5：Vacuum pump is closed when the vacuum thermocouple meter display on vacuum pump reaches setting threshold value, is stopped to adsorbing tank body
Interior coal sample degassing；
S6：Adjust gas pressure regulating valve so that the pressure value that gas pressure adjusts valve outlet reaches given threshold, opens
Gas needle valve I and gas pressure reducer so that high pressure gas enters air accumulator via pipeline, waits for that the gas pressure on air accumulator passes
When the numerical value of sensor I reaches given threshold, the pressure value P is recorded1, it is then turned on gas mass flow gauge and air accumulator
Outlet valve so that high pressure gas enters absorption tube body via gas piping, and opens air bath；
S7：Being again turned on forcing press makes sealing block move, and applies axial stress to coal sample, waits for that the axial stress arrives
Up to after designated value, the displacement distance Δ L of sealing block on record, while coal sample being allowed to fully absorb high pressure watt under loaded condition
This, records absorption tank body volume V at this timexP；
S8：After gas mass flow gauge stablizes specified time interval, and I gentle pressure sensing body of gas pressure sensor
II registration of device is identical, thinks that coal sample adsorption gas balances at this time, records gas mass flow gauge cumulative amount Q at this time0And gas
Pressure sensor registration P2；
S9：The porosity that unlatching rotating platform, x-ray source and ray detector are to coal sample different layers is scanned, will
The hole rate score of different layers position is averaged to obtain adsorption equilibrium pressure P2When mean porosities Φ, calculate coal sample in
Free gas content, the mole of the adsorption gas of coal sample and the adsorption gas content of coal sample.
Further, also include
Step S10：The pipeline connected between air accumulator intake valve and gas pressure regulating valve is removed, is made in adsorption tanks body
Coal sample diffuses gas under normal pressure, the gas diffusing capacity under the time is diffused by gas mass flow gauge record difference, until gas
Weight flowmeter registration is shown as 0ml/min, records gas mass flow gauge cumulative amount Qf；
S11：Step S9 is executed, the porosity Φ after coal sample diffuses gas is obtainedm, and calculate diffuse gas after
Coal sample free gas content, diffuse the free gas amount after gas and remaining adsorbance.
Further, also include
S12：Step S4-S9 is repeated, is obtained under different adsorption gas balance pressure and axially different loaded condition, coal sample
Free gas content and adsorption gas content.
Further, in step S2 be dried the time be for 24 hours more than, in step S5 vacuum thermocouple meter display reach setting
Threshold value is 4 × 10-1Specified time interval is 12h in Pa, step S8.
Further, the free gas content in step S9 in coal sample, the mole of the adsorption gas of coal sample and coal sample
Adsorption gas content is respectively：
Wherein, WyP2It is that high pressure gas gas is balancing pressure P2When, the free gas content in coal sample, T0、P0Respectively
For the absolute temperature under standard state, absolute pressure, T is the absolute temperature in air bath, VkHold for the hole of unit quality coal
Product, Vk=[Φ × π × R2× L × (1- Δ L)]/M, M is coal sample quality, and L is the height of coal sample, and R is coal sample radius, Z2For height
That presses methane gas is balancing pressure P2When compressibility factor；
Wherein, n1For mash gas balancing pressure P2When, the mole of coal sample adsorption gas, Z1It is for high pressure gas gas pressure
P1When, the compressibility factor of methane gas；
Wherein WxP2For the adsorption gas content of coal sample.
Further, coal sample free gas remnants adsorbances are after gas is diffused in step S11：
WxP2c=Q0-Qf-WyP2m×M
Wherein, WyP2mTo diffuse the coal sample free gas content after gas.
The beneficial effects of the present invention are：
(1) amendment that the distinctive coal-bed gas free amount of the present invention calculates with remaining adsorbance method for measuring, it can be achieved that
Coal sample porosity, accurate measurement of free gas content under different gas pressures, different loaded conditions can be that research contains gas
The physical characteristic of coal provides technical support；
(2) amendment that coal-bed gas free amount provided by the invention calculates and remaining adsorbance method for measuring, can be accurate
Measurement coal sample test specimen under different gas pressures, different loaded condition porosity, free gas content, adsorption gas contain
Amount, obtained experimental data can further carry out numerical analysis, and fitting obtains axial stress, adsorption equilibrium gas pressure and hole
Association between gap rate, adsorbance can not only be modified free gas content equation, while can also be to different gas pressures
Under the conditions of porosity be modified, the amendment that final achievable coal seam gas-bearing capacity calculates is accurate evaluation reservoir coal bed gas
Resource provides scientific basis with coal and gas prominent danger；
(3) amendment that coal-bed gas free amount provided by the invention calculates and remaining adsorbance method for measuring, are carrying out
After the measurement for completing the adsorbance of coal sample under corresponding loaded condition, porosity, free gas amount, by opening gas valve, also
The accurate measurement that can carry out coal sample remaining adsorbance under different stress, mash gas balancing pressure condition expands for research coal-bed gas
It dissipates mechanism and reliable technical support is provided.
Description of the drawings
In order to keep the purpose of the present invention, technical solution and advantageous effect clearer, the present invention provides following attached drawing and carries out
Explanation：
Fig. 1 is present invention absorption tank body schematic diagram；
Fig. 2 is apparatus of the present invention structural schematic diagram.
Specific implementation mode
Below in conjunction with attached drawing, the preferred embodiment of the present invention is described in detail.
As shown in Figs. 1-2, the amendment that coal-bed gas free amount calculates and remaining absorption amount determining device, including, adsorption tanks
Body 5, gas pressure reducer 15, Roots vaccum pump 20, gas pressure regulating valve 22, air accumulator 23；
Absorption tank body 5 is provided with sealing block 2 for storing coal sample 1,5 upper end of absorption tank body, and upper sealing block 2 connects
To forcing press, 28 in Fig. 2, lower end is connected to absorption tank body bottom tray 9, absorption tank body bottom tray 9 by connecting flange 10
On be provided with gas stream and connect mouth 8, while adsorbing tank body bottom tray 9 and being additionally provided with groove on the face that tank body 5 contacts with adsorbing
7, absorption tank body bottom tray 9 is connect with absorption tank body 5 by bolt 6, and lattice rice is provided between upper sealing block 2 and coal sample
Circle 12, felt 11, sealing ring 3 and guidance tape 4.
The gas stream that one end of air accumulator 22 is connected to absorption tank body 5 connects mouth 8, and the setting of absorption tank body 5 is in constant temperature sky
In 26 environment of gas bath, 5 lower section of absorption tank body is equipped with rotating platform；
The x-ray source 27 and ray detector 29 of face absorption tank body are installed in constant temperature air bath 26, ray is visited
It surveys device 29 and is connected to data acquisition and analysis system, gas mass flow is provided on absorption tank body 5 and the tank connected pipeline of gas storage
Gauge 25 and gas pressure sensor II 24；
The other end of air accumulator 22 is connected to one end of gas pressure regulating valve 21, the other end of gas pressure regulating valve 21
It is connected to the first port of a triple valve 16, the second port of triple valve 16 passes through gas needle valve I 15 and gas pressure reducer 14
It is connected to air source 13；
The third port of triple valve 16 is connected to Roots vaccum pump 18 by gas needle valve II 17.
It is provided with gas pressure sensor I 23 between the front and back end of air accumulator 22, vacuum is additionally provided on Roots vaccum pump
Thermocouple meter 19 and vacuum diaphragm valve 20.
It is additionally provided with outlet valve on one end that air accumulator 22 is connect with absorption tank body 5.
Rotating platform 30 is arranged in multi-spindle machining mobile device 31, and multi-spindle machining mobile device 31 is arranged in optical table
On 32.
The method of the Simultaneous Determination of the coal petrography adsorbed gas scale of construction, deformation and porosity, includes the following steps：
S1：The coal sample that underground coal mine drills through is prepared into required circle ring column type, then utilizes sand paper to coal sample surface
It polishes, makes its surfacing；
S2：The coal sample prepared is placed in vacuum drying chamber, processing is dried, time control is more than for 24 hours, finally
The size of coal sample is measured, the mass M of coal sample, radius R, height L and volume V are recorded0=π × R2× L, and it is put into mark
The hermetic bag remembered is preserved and is used when in case testing；Before experiment, the pipeline that connects to air accumulator 22 and its between absorption tank body 5
Volume is demarcated, and record 22 volume of air accumulator is Vc, the manifold volume connected between air accumulator 22 and absorption tank body 5 is Vg；
S3：Coal sample 1 is put into absorption tank body 5, absorption 5 inner wall of tank body is suitable with 1 size of coal sample, and adsorbs tank body 5
Rigid interior wall forms annular surface constraint, the annular strain that limitation coal sample 1 generates during the experiment to coal sample 1；
S4：After coal sample 1 is put into absorption tank body 5, the bolt 6 of absorption 5 connecting flange 10 of tank body is tightened, to adsorbing tank body 5
It is sealed；Further, absorption tank body 5 is sealed, using the groove bound rubber sealing ring 3 being set on connecting flange 10
Method, to absorption tank body 5 be sealed；And Opening pressure machine, make sealing block 2 generate displacement, and with 1 upper surface of coal sample
Contact, then closes forcing press, and sealing block 2 is made to stop movement；Further, the upper surface of upper sealing block 2 and coal sample 1 it
Between place felt 11 keep 1 stand under load of coal sample unbalanced to prevent 1 upper surface out-of-flatness of coal sample；The volume of felt 11 is before experiment
It is demarcated, is denoted as Vm；Meanwhile the volume for recording absorption tank body 5 at this time is Vx0；
S5：After adsorbing the sealing of tank body 5, the gas stream that will be set in absorption tank body bottom tray 9 connects mouth 8 and matter
Amount flowmeter 25 is connected by gas piping；Then, so that air accumulator 22 is communicated with entire gas piping, close gas needle valve
I 15, gas needle valve II 17 is opened, so that the absorption tank body 5 equipped with coal sample 1 is communicated with Roots vaccum pump 18, and it is true to open Roots
Sky 18 pairs of coal samples 1 of pump are de-gassed；During cancellation element coal sample 1, coal sample 1 adsorbs shadow of the air to experimental result
It rings；
S6：Wait for that vacuum thermocouple meter 19 shows that numerical value is less than 4 × 10-1After Pa, gas needle valve II 17 and Roots are successively closed
Vacuum pump 18 stops deaerating to the coal sample in absorption tank body 5；
S7：Gas pressure regulating valve 21 is configured, it is requirement of experiment parameter to make the numerical value of its outlet pressure；And successively
Gas pressure reducer 14, the gas needle valve I 15 being connected with air source 13 are opened, makes high pressure gas gas via pipeline, enters to
In air accumulator 22；On air accumulator 22 be arranged air inlet, outlet valve；To be placed on the gas pressure sensor I 23 on air accumulator
Registration be requirement of experiment numerical value after, record pressure value P1, gas mass flow gauge 25 is then opened, and open and be set to
Outlet valve on air accumulator 22 makes high pressure gas be entered in adsorption tanks body via gas piping；And air bath is opened, make it
Temperature is requirement of experiment temperature T；
S8：It is again turned on forcing press, sealing block 2 is made to move, axial stress is applied to coal sample；Forcing press is to coal sample 1
The axial stress of application, after axial stress numerical value is experiment predetermined value δ, the displacement distance Δ L of sealing block 2 on record,
At this point, the volume V of coal sample 1P2=π × R2×L×(1-ΔL).Then, make coal sample 1 under conditions of axial stand under load, fully adsorb
High pressure gas；Meanwhile the volume for recording absorption tank body 5 at this time is VxP；
S9：After 25 registration continuous-stable 12h of gas mass flow gauge, and gas pressure sensor I and gas pressure pass
II registration of sensor is equal, you can thinks that 1 adsorption gas of coal sample balances；At this point, recording 25 cumulative amount Q of gas mass flow gauge0,
The registration P of gas pressure sensor2；
S10：After 1 adsorption gas of coal sample balance, rotating platform 30, x-ray source 27 are opened with ray detector 29 to coal
The porosity of sample different layers position is scanned, and the hole rate score of different layers position is averaged to obtain adsorption equilibrium pressure
P2When mean porosities Φ；At this point, the void content of unit mass coal is Vk=[Φ × π × R2×L×(1-ΔL)]/M；Then
Balance pressure P2When, the free gas content in coal sample is：
In formula：WyP2It is that high pressure gas gas is balancing pressure P2When, the free gas content in coal sample, m3/t；T0、P0
Absolute temperature, absolute pressure respectively under standard state, 273K, 0.101325MPa；It is absolute in air bath when T is experiment
Temperature, K；VkFor the void content of unit quality coal, m3/t；Z2It is that high pressure gas gas is balancing pressure P2When compression because
Son.
S11：Adsorption gas balance pressure P may further be calculated2When, the mole n of the adsorption gas of coal sample1For：
In formula：Z1It is P for high pressure gas gas pressure1When, the compressibility factor of methane gas；n1For mash gas balancing pressure P2
When, the mole of coal sample adsorption gas.
Mash gas balancing pressure P can further be obtained2When, the adsorption gas content of coal sample is：
The method provided by the invention for measuring coal sample remnants adsorbances, includes the following steps：
S12：Complete mash gas balancing pressure P2Under the conditions of, the measurement of the free gas content and adsorption gas content of coal sample
Afterwards, the pipeline connected between air accumulator intake valve and gas pressure regulating valve is removed immediately, makes the coal sample in adsorption tanks body normal
Gas is diffused in pressure, and the gas diffusing capacity under the time is diffused by gas mass flow gauge record difference.Until gas mass flow
Gauge registration is shown as 0ml/min, you can thinks that coal sample is diffused gas and terminated.At this point, it is accumulative to record gas mass flow gauge
Measure Qf；
S13：Repeat S10, you can obtain the porosity Φ after coal sample diffuses gasm, by ΦmIt is updated in formula (1),
It can be obtained the coal sample free gas content W after diffusing gasyP2m；By coal sample free gas content WyP2mWith the matter of coal sample
It measures M to be multiplied, you can obtain the free gas amount after diffusing gas；Remaining adsorbance, which can further be obtained, is
WxP2c=Q0-Qf-WyP2m×M(4)
S14：Repeat S5~S11, you can obtain under different adsorption gas balance pressure and axially different loaded condition, coal sample
Free gas content and adsorption gas content.
Finally illustrate, preferred embodiment above is only to illustrate the technical solution of invention and unrestricted, although passing through
Above preferred embodiment is described in detail the present invention, however, those skilled in the art should understand that, can be in shape
Various changes are made in formula and to it in details, without departing from claims of the present invention limited range.
Claims (10)
1. the amendment that coal-bed gas free amount calculates and remaining absorption amount determining device, it is characterised in that：The device includes to adsorb
Tank body, gas pressure reducer, Roots vaccum pump, gas pressure regulating valve, air accumulator；
The absorption tank body is provided with sealing block for storing coal sample, absorption tank body upper end, and upper sealing block is connected to pressure
Power machine, lower end are connected to absorption tank body bottom tray by connecting flange, gas are provided in the absorption tank body bottom tray
Circulate interface；
One end of the air accumulator is connected to absorption tank body, and absorption tank body is arranged in a constant temperature air bath environment, adsorbs tank body
Lower section is equipped with rotating platform；
The x-ray source and ray detector of face absorption tank body are installed in constant temperature air bath, ray detector is connected to
Data acquire and analysis system, and the gentle body pressure of gas mass flow gauge is provided on absorption tank body and the tank connected pipeline of gas storage
Sensor II；
The other end of air accumulator is connected to one end of gas pressure regulating valve, and the other end of gas pressure regulating valve is connected to one or three
The second port of the first port of port valve, the triple valve is connected to air source by gas needle valve I and gas pressure reducer；
The third port of the triple valve is connected to Roots vaccum pump by gas needle valve II.
2. the amendment that coal-bed gas free amount according to claim 1 calculates and remaining absorption amount determining device, feature
It is：It is provided with gas pressure sensor I between the front and back end of the air accumulator, vacuum is additionally provided on the Roots vaccum pump
Thermocouple meter, the air accumulator are additionally provided with outlet valve on one end for connecting of absorption tank body.
3. the amendment that coal-bed gas free amount according to claim 1 calculates and remaining absorption amount determining device, feature
It is：It is arranged fluted on the connecting flange, the absorption tank body upper end is additionally provided with sealing ring.
4. the amendment that coal-bed gas free amount according to claim 1 calculates and remaining absorption amount determining device, feature
It is：The rotating platform is arranged in multi-spindle machining mobile device, and the multi-spindle machining mobile device is arranged in optical table
On.
5. the amendment that coal-bed gas free amount calculates and remaining absorption quantity measuring method, it is characterised in that：This method includes as follows
Step：
S1：It prepared by the coal sample drilled through is molded, then polished coal sample surface using sand paper, make its surfacing；
S2：The coal sample prepared is placed in vacuum drying chamber, processing is dried, then the size of coal sample is measured；
S3：The manifold volume connected to air accumulator and its between absorption tank body is demarcated, and record gas storage tank volume is Vc, storage
The manifold volume connected between gas tank and absorption tank body is Vg；
S3：Coal sample is put into adsorption tanks body, absorption tank body is sealed, Opening pressure machine makes sealing block generate position
It moves, and is contacted with coal sample upper surface, then close forcing press, so that sealing block is stopped movement, in upper sealing block and coal sample
Upper surface between place felt, record felt volume is Vm, the volume for recording absorption tank body at this time is Vx0；
S4：After adsorbing tank body sealing, gas needle valve II is opened, gas needle valve I is closed, by vacuum pump to entire tank
Body and pipeline are de-gassed；
S5：Vacuum pump is closed when the vacuum thermocouple meter display on vacuum pump reaches setting threshold value, is stopped in adsorption tanks body
Coal sample deaerates；
S6：Adjust gas pressure regulating valve so that the pressure value that gas pressure adjusts valve outlet reaches given threshold, opens gas
Needle valve I and gas pressure reducer so that high pressure gas enters air accumulator via pipeline, waits for the gas pressure sensor on air accumulator
When I numerical value reaches given threshold, the pressure value P is recorded1, it is then turned on going out on gas mass flow gauge and air accumulator
Air valve so that high pressure gas enters absorption tube body via gas piping, and opens air bath；
S7：Being again turned on forcing press makes sealing block move, and applies axial stress to coal sample, waits for that the axial stress arrival refers to
After definite value, the displacement distance Δ L of sealing block on record, while coal sample being allowed to fully absorb high pressure gas under loaded condition, remember
Tank body volume V is adsorbed under record at this timexP；
S8：After gas mass flow gauge stablizes specified time interval, and gas pressure sensor I and gas pressure sensor II
Registration is identical, thinks that coal sample adsorption gas balances at this time, records gas mass flow gauge cumulative amount Q at this time0And gas pressure
Force snesor registration P2；
S9：The porosity that unlatching rotating platform, x-ray source and ray detector are to coal sample different layers is scanned, will be different
The hole rate score of layer position, is averaged to obtain adsorption equilibrium pressure P2When mean porosities Φ, calculate coal sample in trip
From gas bearing capacity, the mole of the adsorption gas of coal sample and the adsorption gas content of coal sample.
6. the amendment that coal-bed gas free amount according to claim 5 calculates and remaining absorption quantity measuring method, feature
It is：Also include
Step S10：The pipeline connected between air accumulator intake valve and gas pressure regulating valve is removed, the coal sample in adsorption tanks body is made
Gas is diffused under normal pressure, the gas diffusing capacity under the time is diffused by gas mass flow gauge record difference, until gas matter
Amount flowmeter registration is shown as 0ml/min, records gas mass flow gauge cumulative amount Qf；
S11：Step S9 is executed, the porosity Φ after coal sample diffuses gas is obtainedm, and calculate the coal after diffusing gas
Sample free gas content diffuses the free gas amount after gas and remaining adsorbance.
7. the amendment that coal-bed gas free amount according to claim 6 calculates and remaining absorption quantity measuring method, feature
It is：Also include
S12：Step S4-S9 is repeated, obtains different adsorption gas balance pressure under axially different loaded condition, coal sample is dissociated
Gas bearing capacity and adsorption gas content.
8. the amendment that coal-bed gas free amount according to claim 6 calculates and remaining absorption quantity measuring method, feature
It is：In step S2 be dried the time be for 24 hours more than, in step S5 vacuum thermocouple meter display reach setting threshold value be 4 ×
10-1Specified time interval is 12h in Pa, step S8.
9. the amendment that coal-bed gas free amount according to claim 6 calculates and remaining absorption quantity measuring method, feature
It is：Free gas content in step S9 in coal sample, the mole of the adsorption gas of coal sample and the adsorption gas of coal sample contain
Amount is respectively：
Wherein, WyP2It is that high pressure gas gas is balancing pressure P2When, the free gas content in coal sample, T0、P0Respectively mark
Absolute temperature, absolute pressure under quasi- state, T are the absolute temperature in air bath, VkFor the void content of unit quality coal, Vk
=[Φ × π × R2× L × (1- Δ L)]/M, M is coal sample quality, and L is the height of coal sample, and R is coal sample radius, Z2For high pressure gas
Gas is balancing pressure P2When compressibility factor；
Wherein, n1For mash gas balancing pressure P2When, the mole of coal sample adsorption gas, Z1It is P for high pressure gas gas pressure1When,
The compressibility factor of methane gas；
Wherein WxP2For the adsorption gas content of coal sample.
10. the amendment that coal-bed gas free amount according to claim 9 calculates and remaining absorption quantity measuring method, feature
It is：Coal sample free gas remnants adsorbances are after diffusing gas in step S11：
WxP2c=Q0-Qf-WyP2m×M
Wherein, WyP2mTo diffuse the coal sample free gas content after gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810012086.8A CN108303509B (en) | 2018-01-05 | 2018-01-05 | Device and method for correcting free amount calculation of coal bed gas and measuring residual adsorption amount |
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| CN114062191A (en) * | 2021-11-17 | 2022-02-18 | 中国地质大学（北京） | Displacement adsorption experimental device and experimental method for binary gas in porous medium |
| CN115541449A (en) * | 2022-11-30 | 2022-12-30 | 煤炭科学技术研究院有限公司 | Underground coal seam gas content measuring method and device and electronic equipment |
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