CN101929939A - A device and method for detecting the diffusion coefficient of coalbed methane in coal matrix - Google Patents
A device and method for detecting the diffusion coefficient of coalbed methane in coal matrix Download PDFInfo
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Abstract
本发明公开了一种检测煤层气在煤基质中的扩散系数的装置和方法。该方法包括：使密封扩散室内的温度保持为额定温度；将煤基质悬于密封扩散室内部；检测密封扩散室内各时刻的煤层气气压，判断所述煤层气气压是否为额定气压，如果低于额定气压，则通过密封导管向密封扩散室内注入煤层气，使密封扩散室内的煤层气气压达到额定气压；记录各时刻注入到密封扩散室中的煤层气的量；根据所述额定温度、额定气压以及各时刻注入到密封扩散室中的煤层气的量，计算煤层气在煤基质中的扩散系数。利用本发明的技术方案检测得到的煤层气在煤基质中的扩散系数比现有技术更接近真实值。
The invention discloses a device and a method for detecting the diffusion coefficient of coal bed gas in coal matrix. The method includes: keeping the temperature in the sealed diffusion chamber at the rated temperature; suspending the coal matrix inside the sealed diffusion chamber; detecting the pressure of the coalbed gas at each moment in the sealed diffusion chamber to determine whether the pressure of the coalbed gas is the rated pressure, and if it is lower than rated air pressure, then inject CBM into the sealed diffusion chamber through the sealed conduit, so that the CBM pressure in the sealed diffusion chamber reaches the rated air pressure; record the amount of CBM injected into the sealed diffusion chamber at each moment; and the amount of coalbed methane injected into the sealed diffusion chamber at each moment, to calculate the diffusion coefficient of coalbed methane in the coal matrix. The diffusion coefficient of the coal bed gas in the coal matrix detected by the technical scheme of the invention is closer to the real value than the prior art.
Description
Technical field
The present invention relates to the cbm development technology, particularly relate to a kind of apparatus and method that detect the coefficient of diffusion of coal-seam gas in matrix of coal.
Background technology
Coal-seam gas is commonly called as " gas ", is with the coal association, is stored in unconventional rock gas in the coal seam with adsorbed state, and its principal ingredient is a methane.Coal-seam gas has following several characteristics: the first, and its calorific value and rock gas are suitable, can mix defeated using with rock gas, and very clean after the burning, produce any waste gas hardly, are first-class industry, chemical industry, generating and resident living fuel; The second, when the air concentration of coal-seam gas reached 5%-16%, meeting naked light will explode, and this is the root of Gas Explosion Accidents in Coal Mines; The 3rd, coal-seam gas directly is discharged in the atmosphere, its greenhouse effect are about 21 times of carbon dioxide, and are very big to environmental destruction.Therefore, first exploiting coal bed methane before mining can have the effect of achieving many things at one stroke: at first, the coal mine gas from explosion rate is reduced by 70% to 85%, effectively improve gas accident strick precaution level; Secondly, effectively GHG emissions mitigation produces good environmental protection effect; Once more, coal-seam gas is carried out commercialization as a kind of efficient, clear energy sources, can produce huge economic benefit.
Before coal-seam gas developed, at first will be familiar with the migration rule of coal-seam gas in matrix of coal, this is for the rational exploitation of coal-seam gas and to improve the recovery ratio of coal-seam gas very crucial.At present, the human dynamic process that coal-seam gas is migrated in matrix of coal has had understanding more clearly: the coal-seam gas that promptly is adsorbed in matrix of coal can be passed through desorb, diffusion and seepage flow three phases to the response of barometric gradient.Desorb is meant that the coal-seam gas that originally is adsorbed in matrix of coal breaks away from matrix of coal and self-existent process; Diffusion is meant coal-seam gas and also finally reaches concentration equally distributed process by area with high mercury to the low concentration region domain migration owing to there is concentration gradient; Seepage flow is meant the concentration gradient that does not have coal-seam gas, and only under the effect of draught head, the zone high from air pressure finally reaches the equally distributed process of air pressure to the low zone migration of air pressure to coal-seam gas.Because matrix of coal has special porous dehiscence gap structure, and the absorption of coal-seam gas and desorption process be reversible substantially, and therefore, diffusion is being brought into play important linking effect in these three migration stages.
Real coal-seam gas diffusion process can be described by the Fick's second law shown in the formula (1), promptly
In the formula (1), (x t) is the concentration of coal-seam gas to C, and t is the time, and x is a volume coordinate, and D is the coefficient of diffusion of coal-seam gas, and the diffusivity of its expression coal-seam gas is the critical quantity relevant with the diffusion process of coal-seam gas.Under the situation that its dependent variable all can accurately record, the levels of precision of diffusion coefficient D is related to the go deep into degree of people to coal-seam gas migration rule understanding in matrix of coal, and then also has influence on the exploitation level of coal-seam gas.Therefore, need detect accurately the coefficient of diffusion of coal-seam gas in matrix of coal.
Prior art detects the coefficient of diffusion of coal-seam gas in matrix of coal, be that the coal particle after pulverizing is sealed in the diffuser casing as the sample that detects usefulness, in diffuser casing, inject coal-seam gas, when coal-seam gas is adsorbed on the sample, the coal-seam gas that can cause gaseous state in the diffuser casing reduces, and make the air pressure in the diffuser casing reduce, utilize the atmospheric pressure value of coal-seam gas in each moment diffuser casing of detection device records, when absorption is saturated, can calculate the coefficient of diffusion of coal-seam gas in this sample by Fick's second law.
But, coal particle after this utilization of prior art is pulverized detects the method for the coefficient of diffusion of coal-seam gas in matrix of coal as sample, because sample is powdered, destroy the distinctive space structure of matrix of coal, caused testing result and the coal-seam gas coefficient of diffusion in real matrix of coal to differ bigger.
Summary of the invention
The invention provides a kind of device that detects the coefficient of diffusion of coal-seam gas in matrix of coal, the coefficient of diffusion of coal-seam gas in matrix of coal that utilizes this device to detect to obtain than prior art more near actual value.
The present invention also provides a kind of method that detects the coefficient of diffusion of coal-seam gas in matrix of coal, the coefficient of diffusion of coal-seam gas in matrix of coal that utilizes this method to detect to obtain than prior art more near actual value.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of device that detects the coefficient of diffusion of coal-seam gas in matrix of coal, this device comprise thermostat, matrix of coal, support, sealing diffuser casing, constant-voltage equipment, coal seam source of the gas and detection computations device, wherein:
Described thermostat links to each other with the sealing diffuser casing, is used to make the temperature in the sealing diffuser casing to remain rated temperature;
Described support is used to support matrix of coal, makes matrix of coal be suspended from sealing diffuser casing inside;
Described constant-voltage equipment links to each other with the coal seam source of the gas with the sealing diffuser casing respectively by sealing duct, be used to detect each coal-seam gas air pressure constantly in the sealing diffuser casing, judge whether described coal-seam gas air pressure is specified air pressure, if be lower than specified air pressure, then control the coal seam source of the gas and in the sealing diffuser casing, inject coal-seam gas, make the coal-seam gas air pressure in the sealing diffuser casing reach specified air pressure by sealing duct;
Described detection computations device links to each other with constant-voltage equipment, is used for writing down the amount that each is injected into the coal-seam gas of sealing diffuser casing constantly, calculates the coefficient of diffusion of coal-seam gas in matrix of coal.
This device further comprises vacuum extractor, and described vacuum extractor links to each other with described constant-voltage equipment by sealing duct, is used for described sealing diffuser casing and described sealing duct vacuum pumping.
Between described sealing diffuser casing and described constant-voltage equipment, this device further comprises filtrator, is used for filtering flows to the gas of described constant-voltage equipment from described sealing diffuser casing dust;
Between described constant-voltage equipment and described coal seam source of the gas, this device further comprises filtrator, is used for the dust of the coal-seam gas that filtering goes out from described coal-seam gas source and course.
Described detection computations device comprises: coal-seam gas data recording equipment and computing machine, wherein,
Described coal-seam gas data recording equipment links to each other with described constant-voltage equipment, is used for writing down the amount that each is injected into the coal-seam gas of sealing diffuser casing constantly, and sends it to described computing machine;
Described computing machine, each that is used for sending according to described rated temperature, specified air pressure and described coal-seam gas data recording equipment are injected into the amount of the coal-seam gas of sealing diffuser casing constantly, calculate the coefficient of diffusion of coal-seam gas in matrix of coal.
Described thermostat is water bath with thermostatic control; Described rated temperature is the temperature between 20 ℃-60 ℃;
And/or,
Described matrix of coal is that maximum crack is no more than 3 microns matrix of coal;
And/or,
The matrix of coal of described matrix of coal for handling through the degassing;
And/or,
Described matrix of coal is the matrix of coal through dried;
And/or,
Described constant-voltage equipment is a volume pump; Described specified air pressure is that 1 atmosphere is pressed onto the air pressure between 10 MPas;
And/or,
Described coal-seam gas data recording equipment is a data collecting card.
A kind of method that detects the coefficient of diffusion of coal-seam gas in matrix of coal, this method comprises:
Make the temperature in the sealing diffuser casing remain rated temperature;
Matrix of coal is suspended from sealing diffuser casing inside;
Detect each coal-seam gas air pressure constantly in the sealing diffuser casing, judge whether described coal-seam gas air pressure is specified air pressure, if be lower than specified air pressure, then in the sealing diffuser casing, inject coal-seam gas by sealing duct, make the coal-seam gas air pressure in the sealing diffuser casing reach specified air pressure;
Each is injected into the amount of the coal-seam gas in the sealing diffuser casing constantly record;
Constantly be injected into the amount of the coal-seam gas in the sealing diffuser casing according to described rated temperature, specified air pressure and each, calculate the coefficient of diffusion of coal-seam gas in matrix of coal.
Before each coal-seam gas air pressure constantly, this method further comprises: with described sealing diffuser casing and described sealing duct vacuum pumping in detecting the sealing diffuser casing.
When detecting the coal-seam gas air pressure that seals each moment in the diffuser casing, this method further comprises: with the powder filtering filtration in the described sealing diffuser casing effluent air;
When injecting coal-seam gas in the sealing diffuser casing, this method further comprises: the dust of the coal-seam gas of the described injection of filtering.
Each is injected into the amount of the coal-seam gas in the sealing diffuser casing constantly described record; Be injected into the amount of the coal-seam gas in the sealing diffuser casing according to described rated temperature, specified air pressure and each moment, calculating the coefficient of diffusion of coal-seam gas in matrix of coal is: each is injected into the amount of the coal-seam gas in the sealing diffuser casing constantly record, and sends it to computing machine; Described computing machine is injected into the amount that seals the coal-seam gas in the diffuser casing according to described rated temperature, specified air pressure and each moment, calculates the coefficient of diffusion of coal-seam gas.
Describedly make the temperature of sealing in the diffuser casing remain rated temperature to be: make the temperature in the sealing diffuser casing remain rated temperature with water bath with thermostatic control; Described rated temperature is the temperature between 20 ℃-60 ℃;
And/or,
Before matrix of coal being suspended from sealing diffuser casing inside, this method further comprises: choose maximum crack and be no more than 3 microns matrix of coal as the matrix of coal that detects usefulness;
And/or,
Before matrix of coal being suspended from sealing diffuser casing inside, this method further comprises: with the processing that outgases of described matrix of coal;
And/or,
Before matrix of coal being suspended from sealing diffuser casing inside, this method further comprises: described matrix of coal is carried out dried;
And/or,
Each coal-seam gas air pressure constantly is in the described detection sealing diffuser casing: detect each coal-seam gas air pressure constantly in the sealing diffuser casing with volume pump; Judge that whether described coal-seam gas air pressure be that the method for specified air pressure is: judge whether described coal-seam gas air pressure is that 1 atmosphere is pressed onto the air pressure between 10 MPas;
And/or,
The amount that each moment of described record is injected into the coal-seam gas in the sealing diffuser casing is: each is injected into the amount that seals the coal-seam gas in the diffuser casing constantly with the data collecting card record.
This shows, among the present invention, owing to matrix of coal can be suspended from the inside of sealing diffuser casing, coal-seam gas in the sealing diffuser casing can fully contact with the matrix of coal surface, and then spread fully and adsorb, therefore, technical scheme provided by the invention can utilize with the matrix of coal of the identical bulk of subterranean coal as the sample that detects usefulness, kept the distinctive space structure of matrix of coal, with respect to prior art, the testing result of coefficient of diffusion and the coal-seam gas coefficient of diffusion in the true lumped coal matrix of subterranean coal is more approaching among the present invention.
Description of drawings
Fig. 1 is the installation drawing of the coefficient of diffusion of detection coal-seam gas provided by the invention in matrix of coal;
Fig. 2 is the specific embodiment figure of the device of the coefficient of diffusion of detection coal-seam gas provided by the invention in matrix of coal;
Fig. 3 is the method figure of the coefficient of diffusion of detection coal-seam gas provided by the invention in matrix of coal.
Embodiment
Core concept of the present invention is: utilize thermostat to make the temperature in the sealing diffuser casing remain rated temperature, matrix of coal is suspended from sealing diffuser casing inside, all surface coal-seam gas interior with sealing diffuser casing of matrix of coal fully contacted; Utilize constant-voltage equipment to detect each coal-seam gas air pressure constantly in the sealing diffuser casing, and judge whether it keeps specified air pressure, if be lower than specified air pressure, then in the sealing diffuser casing, inject coal-seam gas by sealing duct, make the coal-seam gas air pressure in the sealing diffuser casing reach specified air pressure; Simultaneously, write down the amount that each is injected into the coal-seam gas in the sealing diffuser casing constantly, be injected into the amount of the coal-seam gas in the sealing diffuser casing then according to rated temperature, specified air pressure and each moment, calculate the coefficient of diffusion of coal-seam gas in matrix of coal.
This shows, among the present invention, owing to matrix of coal can be suspended from the inside of sealing diffuser casing, coal-seam gas in the sealing diffuser casing can fully contact with the matrix of coal surface, and then spread fully and adsorb, therefore, technical scheme provided by the invention can utilize with the matrix of coal of the identical bulk of subterranean coal as the sample that detects usefulness, kept the distinctive space structure of matrix of coal, with respect to prior art, the testing result of coefficient of diffusion and the coal-seam gas coefficient of diffusion in the true lumped coal matrix of subterranean coal is more approaching among the present invention.
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the installation drawing of the coefficient of diffusion of detection coal-seam gas provided by the invention in matrix of coal.As shown in Figure 1, this device comprises thermostat 1, matrix of coal 4, support 5, sealing diffuser casing 19, constant-voltage equipment 15, coal seam source of the gas 17 and detection computations device 14, wherein:
Constant-voltage equipment 15 links to each other with coal seam source of the gas 17 with sealing diffuser casing 19 respectively by sealing duct 18, be used to detect each coal-seam gas air pressure constantly in the sealing diffuser casing 19, constant-voltage equipment 15 is used to also judge whether each coal-seam gas air pressure constantly is specified air pressure, if be lower than specified air pressure, then control coal seam source of the gas 17 and in sealing diffuser casing 19, inject coal-seam gas, make the coal-seam gas air pressure in the sealing diffuser casing 19 reach specified air pressure by sealing duct 18; Like this, coal-seam gas air pressure in the sealing diffuser casing 19 remains constant voltage, after coal-seam gas contacts because of diffusion and matrix of coal are surperficial, can be adsorbed and cause the reduction of sealing diffuser casing 19 internal gas pressures by matrix of coal, constant-voltage equipment 15 can be controlled coal seam source of the gas 17 gas injection in sealing diffuser casing 19 rapidly, thereby makes air pressure revert to specified air pressure; As time goes on; absorption can reach capacity; at this moment; air pressure president time-preserving in the sealing diffuser casing 19; this means to detect and finish; answer stopping device, stop to detect, for example; when the air pressure in the sealing diffuser casing 19 did not change in one hour; think that promptly adsorption process finishes, stop to detect, certainly; can not choose when the air pressure that seals in the diffuser casing 19 did not change in half an hour yet and stop to detect; choosing of this time is relevant with testing conditions, no matter chooses the trigger condition how long conduct stops to detect, all within protection scope of the present invention.
This device further comprises vacuum extractor, and this vacuum extractor links to each other with constant-voltage equipment 15 by sealing duct 18, is used for sealing diffuser casing 19 and sealing duct 18 vacuum pumpings.After sealing diffuser casing 19 and sealing duct 18 are by vacuum pumping, again to wherein injecting coal-seam gas, just be entirely pure coal-seam gas in the sealing diffuser casing 19, and there are not air and other assorted gas, like this, both needn't worry that coal-seam gas can mix air or other gas, may blast under certain condition, needn't consider also how coal-seam gas will seal the air of diffuser casing 19 and sealing duct 18 or the problem that other gas is discharged when injecting, the process of diffusion of follow-up coal-seam gas and absorption also can be very abundant, and is identical with diffusion and adsorption process in descending the matrix of coal layer truly.
Between sealing diffuser casing 19 and constant-voltage equipment 15, this device further comprises filtrator, is used for filtering flows to the gas of constant-voltage equipment 15 from sealing diffuser casing 19 dust;
Between constant-voltage equipment 15 and coal seam source of the gas 17, this device further comprises filtrator, is used for the dust of filtering from the coal-seam gas of coal seam source of the gas 17 outflows.
Among the present invention, owing to sealing between diffuser casing 19 and the constant-voltage equipment 15 and further comprising filtrator between constant-voltage equipment 15 and the coal seam source of the gas 17, be respectively applied for filtering and flow to dust and the dust from the coal-seam gas that coal seam source of the gas 17 flows out the gas of constant-voltage equipment 15 from sealing diffuser casing 19, therefore, constant-voltage equipment 15 can be worked in the environment that not influenced by dust, thereby prolonged its serviceable life, also improved it and detected the accuracy of coal-seam gas air pressure.
Fig. 2 is the specific embodiment figure of the device of the coefficient of diffusion of detection coal-seam gas provided by the invention in matrix of coal.As shown in Figure 2, the detection computations device comprises: coal-seam gas data recording equipment 7 and computing machine 17, wherein,
Coal-seam gas data recording equipment 7 links to each other with constant-voltage equipment 15, is used for writing down the amount that each is injected into the coal-seam gas of sealing diffuser casing 19 constantly, and sends it to computing machine 17;
In the specific embodiment shown in Figure 2, the sealing diffuser casing is made up of diffuser casing 6 and seal flange 3 two parts, and the two closely is fixed together, common guarantee seal the sealing of diffuser casing.Constant-voltage equipment is a volume pump 9, and its accuracy of detection is 2 microlitres, and specified air pressure is that 1 atmosphere is pressed onto the air pressure between 10 MPas.Between volume pump 9 and sealing diffuser casing, this specific embodiment is provided with gas valve 11, and be used for pilot-gas and whether can inject, and the flow velocity of gas.
As shown in Figure 2, the coal seam source of the gas comprises coal-seam gas steel cylinder 12 and a gas valve 11, and can this gas valve 11 is used to control coal-seam gas steel cylinder 12 flow out coal-seam gas, and the flow velocity of coal-seam gas.Between volume pump 9 and coal seam source of the gas, this specific embodiment is provided with gas valve 11, and can the coal-seam gas that be used for controlling coal-seam gas steel cylinder 12 flow into the flow velocity of volume pump 9 and coal-seam gas.
Between volume pump 9 and sealing diffuser casing, and between volume pump 9 and the coal seam source of the gas, this specific embodiment all is provided with filtrator 10, is used for filtering from sealing dust and the dust from the coal-seam gas that the coal-seam gas source and course goes out that diffuser casing flows to the gas of volume pump 9.
As shown in Figure 2, vacuum extractor 10 links to each other with volume pump 9, is used for sealing diffuser casing and sealing duct vacuum pumping.Between vacuum extractor 10 and volume pump 9, this specific embodiment also is provided with a gas valve 11, and can be used to control vacuum extractor vacuumize.
Also increased a tensimeter 2 among this embodiment, be used for further detecting each coal-seam gas air pressure constantly of sealing diffuser casing, the air pressure that detects the corresponding moment that obtains with volume pump 9 compares, thereby improves the precision that detects.
Among the present invention, thermostat 1 is water bath with thermostatic control, and selected rated temperature is the temperature between 20 ℃-60 ℃, i.e. formation temperature.
Matrix of coal 4 is no more than 3 microns matrix of coal for maximum crack, and its shape can be rectangular parallelepiped, and thickness can be 5mm, and xsect is 250mm
2, certainly, the shape of matrix of coal also can be square; its each length of side is 10mm, and the shape of matrix of coal also can be other shapes, and size also can be other sizes; enumerate no longer one by one at this, no matter matrix of coal adopts which kind of shape and which kind of size, all within protection scope of the present invention.
Matrix of coal 4 can be the matrix of coal of handling through the degassing, like this, just can reject the coal-seam gas and the influence of other assorted gas to detecting that originally have been adsorbed in the matrix of coal, and improves the accuracy that detects.
Matrix of coal 4 can be the matrix of coal through dried, like this, just can reject moisture in the matrix of coal to the influence of accuracy of detection, further improves accuracy in detection of the present invention.
Coal-seam gas data recording equipment 7 can be selected data collecting card.
Fig. 3 is the method figure of the coefficient of diffusion of detection coal-seam gas provided by the invention in matrix of coal.As shown in Figure 3, this method comprises:
Step 301: make the temperature in the sealing diffuser casing remain rated temperature; Matrix of coal is suspended from sealing diffuser casing inside.
Here, matrix of coal is suspended from sealing diffuser casing inside, can realize by the method that matrix of coal is supported on the support, so just can guarantee that its each surface can both fully contact with the coal-seam gas of injecting the sealing diffuser casing.
Step 302: detect each coal-seam gas air pressure constantly in the sealing diffuser casing, judge whether coal-seam gas air pressure is specified air pressure, if be lower than specified air pressure, then in the sealing diffuser casing, inject coal-seam gas by sealing duct, make the coal-seam gas air pressure in the sealing diffuser casing reach specified air pressure.
Here, when coal-seam gas was adsorbed in matrix of coal, the air pressure that can detect in the sealing diffuser casing reduced, thereby injected coal-seam gas gas by sealing duct in the sealing diffuser casing, made the coal-seam gas air pressure in the sealing diffuser casing reach specified air pressure again.
As time goes on, absorption can reach capacity, and at this moment, the air pressure president time-preserving in the sealing diffuser casing this means to detect and finishes, and answers stopping device, stops to detect, thereby calculates the coefficient of diffusion of coal-seam gas in matrix of coal.For example; when the air pressure in the sealing diffuser casing did not change in one hour; think that promptly adsorption process finishes; stop to detect; certainly, also can not choose when the air pressure of sealing in the diffuser casing did not change in half an hour and stop to detect, choosing of this time is relevant with testing conditions; no matter choose the trigger condition how long conduct stops to detect, all within protection scope of the present invention.
Step 303: each constantly is injected into the amount of the coal-seam gas in the sealing diffuser casing record, and is injected into the amount of the coal-seam gas in the sealing diffuser casing constantly according to rated temperature, specified air pressure and each, calculates the coefficient of diffusion of coal-seam gas in matrix of coal.
Here, utilize each moment of record to be injected into the amount that seals the coal-seam gas in the diffuser casing, can produce the time dependent curve of amount that is injected into coal-seam gas in the sealing diffuser casing, and then produce the time dependent curve of coal-seam gas adsorbance, then in the formula (1) with each boundary condition substitution Fick's second law, thereby calculate the coefficient of diffusion of coal-seam gas in matrix of coal.The amount that is injected into the coal-seam gas of sealing in the diffuser casing can be for being injected into the volume of the coal-seam gas in the sealing diffuser casing, also can be the amount of substance that is injected into the coal-seam gas in the sealing diffuser casing or quality etc.
Utilize the method for the coefficient of diffusion of Fick's second law calculating coal-seam gas in matrix of coal as follows:
The diffusion process of coal-seam gas in matrix of coal obeyed Fick's second law as the formula (1), in the formula (1), the center of matrix of coal is a true origin, volume coordinate x axle passes initial point, and xsect perpendicular to matrix of coal, the thickness of matrix of coal is 21, and the coal-seam gas concentration in the sealing diffuser casing remains constant C
1, then the boundary condition of Fick's second law is:
C(x，0)＝0 (-l＜x＜l) (2)
C(-l，t)＝C
1，?C(l，t)＝C
1 (3)
With boundary condition formula (2) and formula (3) substitution formula (1), the analytic solution that can get formula (1) are as follows:
In the formula (4), M
tMatrix of coal is to the adsorbance of coal-seam gas, M during for moment t
∞Be the matrix of coal that detects usefulness maximal absorptive capacity to coal-seam gas.
With
Expression is worked as
The time
Value, then the adsorbance of coal-seam gas is reached a half of maximal absorptive capacity when matrix of coal, can get by formula (4):
Be no more than in error under 0.001% the situation, formula (5) but abbreviation be
Like this, can produce the time dependent curve of adsorbance of coal-seam gas exactly according to detection method provided by the invention, thereby obtain accurately
Value, and then utilize formula (6) accurately to calculate the diffusion coefficient D of coal-seam gas in matrix of coal.
Detect in step 302 before the coal-seam gas air pressure in each moment in the sealing diffuser casing, this method further comprises: will seal diffuser casing and sealing duct vacuum pumping.Inject coal-seam gas again in sealing diffuser casing like this, just being full of in the sealing diffuser casing is complete pure coal-seam gas, and does not have air and other gas.
When detecting the coal-seam gas air pressure in each moment in the sealing diffuser casing in step 302, this method further comprises: will seal the powder filtering filtration in the diffuser casing effluent air.Here, can realize the work of filtering with filtrator.
When injecting coal-seam gas in the sealing diffuser casing, this method further comprises: the dust of the coal-seam gas that filtering is injected.Here, can realize the work of filtering with filtrator.
By filtering from sealing diffuser casing effluent air dust and injection the dust of coal-seam gas, just can in the environment that not influenced by dust, work, so just prolonged its serviceable life, also improved the accuracy of its detection coal-seam gas air pressure.
The specific implementation method of step 303 can for: each constantly is injected into the amount of the coal-seam gas in the sealing diffuser casing record, and sends it to computing machine; This computing machine is injected into the amount that seals the coal-seam gas in the diffuser casing according to rated temperature, specified air pressure and each moment, calculates the coefficient of diffusion of coal-seam gas in matrix of coal.
The method that makes the interior temperature of sealing diffuser casing remain rated temperature in the step 301 is: make the temperature in the sealing diffuser casing remain rated temperature with water bath with thermostatic control, here, rated temperature is the temperature between 20 ℃-60 ℃, is formation temperature.
In step 301 matrix of coal is suspended from before the sealing diffuser casing inside, this method further comprises: choose maximum crack and be no more than 3 microns matrix of coal as the matrix of coal that detects usefulness.
In step 301 matrix of coal is suspended from before the sealing diffuser casing inside, this method further comprises: to the matrix of coal processing that outgases.
In step 301 matrix of coal is suspended from before the sealing diffuser casing inside, this method further comprises: matrix of coal is carried out dried.
The method that detects each coal-seam gas air pressure constantly in the sealing diffuser casing in the step 302 is: detect each coal-seam gas air pressure constantly in the sealing diffuser casing with volume pump.
Judge in the step 302 that whether coal-seam gas air pressure be that the method for specified air pressure is: judge whether coal-seam gas air pressure is that 1 atmosphere is pressed onto the air pressure between 10 MPas.
Writing down each method that is injected into the amount of the coal-seam gas in the sealing diffuser casing constantly in the step 303 is: the amount that respectively constantly is injected into the coal-seam gas in the sealing diffuser casing with the data collecting card record.
This shows that the present invention has the following advantages:
(1) among the present invention, owing to matrix of coal can be suspended from the inside of sealing diffuser casing, coal-seam gas in the sealing diffuser casing can fully contact with the matrix of coal surface, and then spread fully and adsorb, therefore, technical scheme provided by the invention can utilize with the matrix of coal of the identical bulk of subterranean coal as the sample that detects usefulness, kept the distinctive space structure of matrix of coal, with respect to prior art, the testing result of coefficient of diffusion and the coal-seam gas coefficient of diffusion in the true lumped coal matrix of subterranean coal is more approaching among the present invention.
(2) among the present invention, because after will sealing diffuser casing and sealing duct vacuum pumping with vacuum extractor, again to wherein injecting coal-seam gas, be entirely pure coal-seam gas in the sealing diffuser casing, and there are not air and other gas, therefore, utilize technical scheme of the present invention, both needn't worry that coal-seam gas can mix air or other gas, may blast under certain condition, also needn't consider how will seal when coal-seam gas is injected the air of diffuser casing 19 and sealing duct 18 or the problem that other gas is discharged, follow-up coal-seam gas spreads and adsorption process also can be very abundant, and is identical with diffusion and adsorption process in descending the matrix of coal layer truly.
(3) among the present invention, since constant-voltage equipment and the sealing diffuser casing between and further comprised filtrator between constant-voltage equipment and the coal seam source of the gas, be respectively applied for filtering and flow to dust and the dust from the coal-seam gas that the coal-seam gas source and course goes out the gas of constant-voltage equipment from the sealing diffuser casing, therefore, constant-voltage equipment can be worked in the environment that not influenced by dust, thereby prolonged its serviceable life, also improved it and detected the accuracy of coal-seam gas air pressure.
(4) among the present invention, because adopting water bath with thermostatic control to keep the temperature in the sealing diffuser casing is formation temperature, can make testing conditions further identical with the migration condition of coal-seam gas in real matrix of coal, therefore, the present invention has improved the accuracy of coal-seam gas coefficient of diffusion.
(5) among the present invention, because matrix of coal is through the degassing and dried, therefore, utilize technical scheme of the present invention to detect the coefficient of diffusion of coal-seam gas, can reject this and be adsorbed on the influence of moisture in coal-seam gas in the matrix of coal and other assorted gas and the matrix of coal, thereby improve the accuracy that detects detecting.
(6) among the present invention, because testing conditions is that the temperature in the sealing diffuser casing remains formation temperature, air pressure remains the specified air pressure between 1 atmospheric pressure to 10 MPa, therefore, testing conditions of the present invention is identical with the migration condition of coal-seam gas in real matrix of coal, and the present invention is not high to the requirement of air pressure yet, does not need harsh air-proof condition can realize detecting accurately.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a device that detects the coefficient of diffusion of coal-seam gas in matrix of coal is characterized in that, this device comprises thermostat, matrix of coal, support, sealing diffuser casing, constant-voltage equipment, coal seam source of the gas and detection computations device, wherein:
Described thermostat links to each other with the sealing diffuser casing, is used to make the temperature in the sealing diffuser casing to remain rated temperature;
Described support is used to support matrix of coal, makes matrix of coal be suspended from sealing diffuser casing inside;
Described constant-voltage equipment links to each other with the coal seam source of the gas with the sealing diffuser casing respectively by sealing duct, be used to detect each coal-seam gas air pressure constantly in the sealing diffuser casing, judge whether described coal-seam gas air pressure is specified air pressure, if be lower than specified air pressure, then control the coal seam source of the gas and in the sealing diffuser casing, inject coal-seam gas, make the coal-seam gas air pressure in the sealing diffuser casing reach specified air pressure by sealing duct;
Described detection computations device links to each other with constant-voltage equipment, is used for writing down the amount that each is injected into the coal-seam gas of sealing diffuser casing constantly, calculates the coefficient of diffusion of coal-seam gas in matrix of coal.
2. device according to claim 1 is characterized in that this device further comprises vacuum extractor, and described vacuum extractor links to each other with described constant-voltage equipment by sealing duct, is used for described sealing diffuser casing and described sealing duct vacuum pumping.
3. device according to claim 1 is characterized in that,
Between described sealing diffuser casing and described constant-voltage equipment, this device further comprises filtrator, is used for filtering flows to the gas of described constant-voltage equipment from described sealing diffuser casing dust;
Between described constant-voltage equipment and described coal seam source of the gas, this device further comprises filtrator, is used for the dust of the coal-seam gas that filtering goes out from described coal-seam gas source and course.
4. according to claim 1,2 or 3 described devices, it is characterized in that described detection computations device comprises: coal-seam gas data recording equipment and computing machine, wherein,
Described coal-seam gas data recording equipment links to each other with described constant-voltage equipment, is used for writing down the amount that each is injected into the coal-seam gas of sealing diffuser casing constantly, and sends it to described computing machine;
Described computing machine, each that is used for sending according to described rated temperature, specified air pressure and described coal-seam gas data recording equipment are injected into the amount of the coal-seam gas of sealing diffuser casing constantly, calculate the coefficient of diffusion of coal-seam gas in matrix of coal.
5. device according to claim 4 is characterized in that,
Described thermostat is water bath with thermostatic control; Described rated temperature is the temperature between 20 ℃-60 ℃;
And/or,
Described matrix of coal is that maximum crack is no more than 3 microns matrix of coal;
And/or,
The matrix of coal of described matrix of coal for handling through the degassing;
And/or,
Described matrix of coal is the matrix of coal through dried;
And/or,
Described constant-voltage equipment is a volume pump; Described specified air pressure is that 1 atmosphere is pressed onto the air pressure between 10 MPas;
And/or,
Described coal-seam gas data recording equipment is a data collecting card.
6. a method that detects the coefficient of diffusion of coal-seam gas in matrix of coal is characterized in that, this method comprises:
Make the temperature in the sealing diffuser casing remain rated temperature;
Matrix of coal is suspended from sealing diffuser casing inside;
Detect each coal-seam gas air pressure constantly in the sealing diffuser casing, judge whether described coal-seam gas air pressure is specified air pressure, if be lower than specified air pressure, then in the sealing diffuser casing, inject coal-seam gas by sealing duct, make the coal-seam gas air pressure in the sealing diffuser casing reach specified air pressure;
Each is injected into the amount of the coal-seam gas in the sealing diffuser casing constantly record;
Constantly be injected into the amount of the coal-seam gas in the sealing diffuser casing according to described rated temperature, specified air pressure and each, calculate the coefficient of diffusion of coal-seam gas in matrix of coal.
7. method according to claim 6 is characterized in that, before each coal-seam gas air pressure constantly, this method further comprises: with described sealing diffuser casing and described sealing duct vacuum pumping in detecting the sealing diffuser casing.
8. method according to claim 6 is characterized in that,
When detecting the coal-seam gas air pressure that seals each moment in the diffuser casing, this method further comprises: with the powder filtering filtration in the described sealing diffuser casing effluent air;
When injecting coal-seam gas in the sealing diffuser casing, this method further comprises: the dust of the coal-seam gas of the described injection of filtering.
9. according to claim 6,7 or 8 described methods, it is characterized in that each is injected into the amount of the coal-seam gas in the sealing diffuser casing constantly described record; Be injected into the amount of the coal-seam gas in the sealing diffuser casing according to described rated temperature, specified air pressure and each moment, calculating the coefficient of diffusion of coal-seam gas in matrix of coal is: each is injected into the amount of the coal-seam gas in the sealing diffuser casing constantly record, and sends it to computing machine; Described computing machine is injected into the amount that seals the coal-seam gas in the diffuser casing according to described rated temperature, specified air pressure and each moment, calculates the coefficient of diffusion of coal-seam gas in matrix of coal.
10. method according to claim 9 is characterized in that,
Describedly make the temperature of sealing in the diffuser casing remain rated temperature to be: make the temperature in the sealing diffuser casing remain rated temperature with water bath with thermostatic control; Described rated temperature is the temperature between 20 ℃-60 ℃;
And/or,
Before matrix of coal being suspended from sealing diffuser casing inside, this method further comprises: choose maximum crack and be no more than 3 microns matrix of coal as the matrix of coal that detects usefulness;
And/or,
Before matrix of coal being suspended from sealing diffuser casing inside, this method further comprises: with the processing that outgases of described matrix of coal;
And/or,
Before matrix of coal being suspended from sealing diffuser casing inside, this method further comprises: described matrix of coal is carried out dried;
And/or,
Each coal-seam gas air pressure constantly is in the described detection sealing diffuser casing: detect each coal-seam gas air pressure constantly in the sealing diffuser casing with volume pump; Judge that whether described coal-seam gas air pressure be that the method for specified air pressure is: judge whether described coal-seam gas air pressure is that 1 atmosphere is pressed onto the air pressure between 10 MPas;
And/or,
The amount that each moment of described record is injected into the coal-seam gas in the sealing diffuser casing is: each is injected into the amount that seals the coal-seam gas in the diffuser casing constantly with the data collecting card record.
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