CN105092410A - Method and device for measuring desorption amount of large-block-size residual coal gas in goaf - Google Patents
Method and device for measuring desorption amount of large-block-size residual coal gas in goaf Download PDFInfo
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Abstract
The invention relates to a method and a device for measuring the gas desorption amount of large-block-size residual coal in a goaf, and belongs to the technical field of coal mine gas content measurement. The method comprises the steps of selecting naturally scattered coal samples with different particle sizes, classifying the coal samples according to the particle sizes, then respectively placing the coal samples with different particle sizes into sealing units with different sizes for sealing, connecting the sealing units with a gas detection device, finally placing the sealing units into a constant-temperature water bath, keeping constant desorption temperature, enabling the pressure of the sealing units and the pressure of the gas measurement device to reach a balanced state, and determining the gas desorption amount. The method and the device for measuring the gas desorption amount of the large-block-size residual coal in the goaf can accurately measure and calculate the gas desorption amount of the residual coal in the goaf, study the gas desorption rules of coal samples with different particle sizes, and have the advantages of simplicity, practicability and wide application value.
Description
Technical Field
The invention belongs to the technical field of coal mine gas content determination, and relates to a method and a device for determining the gas desorption amount of large-block-size residual coal in a goaf.
Background
Coal mine gas is used as a high-energy clean energy source, and exploration, development and utilization technologies of the coal mine gas are increasingly paid more and more attention in multiple countries in the world. The coal mining history of China is long, a large number of closed goafs (or abandoned mines) are left, the goaf gas ground extraction technology can fully utilize the pressure relief and permeability increasing effects of coal seam mining, avoid the severe active period of rock strata, achieve the maximization of the extraction service life of ground wells, and has good development prospects in China. The coal mine goaf gas sources comprise several categories of near pressure-relief coal seam gas, residual gas of coal pillars in a stope, residual gas of coal breakage in the goaf and the like, wherein the desorption amount of the residual gas of coal breakage is an important component of gas resources which can be extracted in the goaf, and the estimation accuracy directly influences the reliability of the estimation result of the gas resource amount in the goaf. At present, the domestic research results on the desorption rule of the residual gas of coal breakage and the content change of the residual gas of coal breakage in the closed goaf of the coal mine are few, and the accurate selection of the related evaluation parameters of the gas resource amount in the goaf is not enough.
Therefore, research on gas desorption experiments of the residual coal with different particle sizes in the goaf needs to be carried out to know the desorption rule of the primary residual coal with large lumpiness. The existing gas desorption experimental method has the following defects aiming at the practical situation of desorption of the large-particle-size primary coal sample in the goaf:
(1) most of the existing experiments are to process a primary coal sample into coal powder with the particle size of less than 10mm, gas desorption experiments performed on primary large-particle-size lump coal are few, and the residual coal in an old goaf is mostly lump coal with different particle sizes, so that the desorption rules of coal samples with different lump sizes need to be known;
(2) in the desorption time aspect, the experimental desorption time at the present stage is concentrated between 30-200 min, the desorption amount change condition of the initial stage of gas desorption is determined under the condition that a coal sample is subjected to saturated adsorption, and the change rule of the gas content after the residual coal in the goaf is desorbed for a long time is required to be known in the actual production activities such as goaf resource assessment and the like, so that the long-time desorption experimental study is required to be carried out on the coal samples with different particle sizes;
in summary, based on the existing research, corresponding experimental research needs to be performed on the specific situation of the desorption of the residual coal gas in the old goaf, so as to obtain the gas desorption rule of coal samples with different particle sizes in the specific old goaf.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for measuring a gas desorption amount of large-block-size coal left in a goaf, which can measure and calculate the gas desorption amount of coal left in the goaf, and provide an accurate basis for goaf resource assessment.
The invention aims to provide a method for measuring the desorption amount of large-block-size residual coal gas in a goaf, and the invention aims to provide a device for measuring the desorption amount of large-block-size residual coal gas in the goaf.
One of the purposes of the invention is realized by the following technical scheme:
a method for measuring the desorption amount of large-block-size residual coal gas in a goaf comprises the following steps:
step 1) selecting naturally scattered coal samples with different particle sizes in a goaf, and classifying the coal samples according to the particle sizes;
step 2) respectively putting coal samples with different particle sizes into sealing units with different sizes, and sealing the sealing units;
step 3) connecting the sealing unit with a gas detection device, and checking the air tightness of the device;
and 4) putting the sealing unit into a constant-temperature water bath, keeping constant desorption temperature, enabling the pressure of the sealing unit and the pressure of the gas measuring device to reach a balanced state, and starting to measure the gas desorption amount.
Further, the coal sample is kept in the original state taken down from the working face and is hermetically transported to a laboratory without being subjected to drying, degassing and saturated adsorption processes, and desorption is carried out according to the original gas content of the coal sample. .
Further, the step 2) is to adopt a vacuum sealing method for sealing the sealing unit, wherein the sealing unit is a sealing bag, the sealing bag is pumped to a compressed state by a vacuum pump, and the pressure of the sealing bag and the pressure of the gas detection device reach a dynamic balance state.
Further, the change rule of the coal sample gas desorption speed along with time is as follows:
wherein, VtThe gas desorption speed of the coal sample when the desorption time is t; t is the gas desorption time of the coal sample, t is more than or equal to 1, and unit d; alpha and beta are attenuation coefficients of the gas desorption speed along with time.
Further, the desorption speed of the residual coal gas with different particle sizes at different temperatures is as follows:
VT＝V20×η
wherein, VTThe desorption speed is the gas desorption speed at the time T when the desorption temperature is T; v20The desorption rate is the gas desorption rate at the time t when the desorption temperature is 20 ℃; t is desorption temperature of coal sample(ii) a Eta is a correction coefficient of the temperature to the gas desorption speed,a. b is a regression coefficient, and T is a gas desorption temperature.
Further, the empirical formula for calculating the accumulated desorption amount of the residual coal with different particle sizes at different temperatures is as follows:
wherein alpha is the attenuation coefficient of the gas desorption speed along with time, and alpha is 60.9421 multiplied by 0.7433r+ 4.3575; t is the gas desorption time (d) of the coal sample, and t is more than or equal to 1; r is the coal sample particle size; eta is a correction coefficient of the temperature to the gas desorption speed,a. b is a regression coefficient, and T is a gas desorption temperature.
The second purpose of the invention is realized by the following technical scheme:
a device for measuring the gas desorption amount of large-block-size residual coal in a goaf comprises a coal sample sealing unit, a gas measuring unit and a constant temperature unit; the coal sample sealing unit is connected with the gas measuring unit, and the gas measuring unit is used for measuring the gas desorption amount of the coal sample; the constant temperature unit is used for preserving heat of the coal sample sealing unit and measuring the gas desorption amount of the coal sample at different temperatures.
Further, the coal sample sealing unit is a compressible vacuum sealing bag, and the pressure of the sealing bag and the pressure of the gas detection device reach a dynamic balance state.
Further, the constant temperature unit is a constant temperature water bath, the coal sample sealing unit is placed in the constant temperature water bath, and long-time gas desorption data of the coal samples at different temperatures are obtained by controlling the temperature of the constant temperature water bath.
Furthermore, the measuring device also comprises a vacuum pump, a vacuum gauge and a valve; the vacuum pump is used for pumping the sealing unit to a compression state, and the vacuum meter is used for measuring the vacuum degree or the air pressure of the sealing unit and the gas detection device; the valve is used to control the airflow throughout the device.
The invention has the beneficial effects that: the method and the device for measuring the gas desorption amount of the large-block-size residual coal in the goaf can accurately measure and calculate the gas desorption amount of residual coal with different particle sizes in the goaf, select the naturally scattered coal samples with different particle sizes, keep the original state of the coal samples as much as possible for measurement, reduce the relative error of measurement, adopt the sealing bag for sealing, effectively reduce the internal dead space, tightly attach the coal samples, ensure the accuracy of measurement, are convenient to install and low in cost, and can measure the influence of temperature on the gas desorption of the residual coal through the constant temperature unit.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the operation of a coal sample sealing unit;
FIG. 2 is a block diagram of the apparatus of the present invention;
FIG. 3 is a flow chart of the method of the present invention;
wherein, 1 in fig. 2 and 3 is a coal sample sealing unit, 2 is a constant temperature unit gas measuring unit, and 3 is a valve I; 4 is a vacuum pump, 5 is a vacuum gauge, 6 is a liquid burette, and 7 is a valve II.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention provides a method for measuring the desorption amount of large-block-size residual coal gas in a goaf, which comprises the following steps of:
step 1) selecting naturally scattered coal samples with different particle sizes in a goaf, and classifying the coal samples according to the particle sizes;
the coal sample is sealed and transported to a laboratory in the original state taken down from the working face without the processes of drying, degassing and saturated adsorption, and the original gas content of the coal sample is used for desorption.
Step 2) respectively putting coal samples with different particle sizes into sealing units with different sizes, and sealing the sealing units;
the main factors influencing the particle size of the residual coal in the goaf are as follows:
physical properties of coal: when the coal quality hardness coefficient of the coal bed is larger, the coal body is not easy to break when falling, and the number of large coal bodies is large, so the average particle size of the residual coal is larger.
The coal mining method comprises the following steps: when fully mechanized top coal caving is adopted for coal mining, compared with stratified mining, the repeated crushing times of the coal seam is lower when the top coal caving is adopted for mining, so that more large-particle-size lump coal exists, and the average particle size of the residual coal in the corresponding goaf can be increased.
Thirdly, mine pressure: the larger the mining height at one time is, the more serious the ore pressure borne by the left coal pillar is, and the large coal body is crushed under the action of the ore pressure, so that the average particle size of the left coal is relatively smaller.
Fourthly, geological structure: when the working face meets a geological formation zone, the coal body can be broken, and the particle size of the residual coal can be reduced.
The method comprises the steps of collecting a coal sample as a fresh coal sample of a working face, selecting the coal sample which is naturally scattered and has different particle sizes, and according to the actual situation of a sampled coal mine and on-site observation, selecting the particle size of the coal sample to be larger in proportion to on-site residual coal.
After the residual gas content is measured on site, the coal sample is sealed by a double-layer sealing bag underground and then is transported to a laboratory, so that the oxidation of the coal sample and the loss of external moisture are prevented, and the original state of the coal sample is maintained as much as possible.
After the coal sample is transported to a laboratory, coal dust with smaller particle size is filtered out, and the coal dust with smaller particle size is respectively filled into sealed experiment bags after being weighed according to experiment requirements. The coal sample can receive the influence of various external factors at carrying out the gas desorption in-process, and the coal sample of little quality is gathering, preparation and experimentation, often can increase the relative error of gas desorption experiment and coal seam gas assay, for the relative error that minimizes the experiment, this experiment adopts big quality (1KG) coal sample to carry out the experimental study, according to the sample working face lump coal particle size distribution actual conditions, select the coal sample scope and roughly distribute for 10mm ~ 150mm, every group experiment coal sample particle size difference is 10 mm.
The sealing unit is a sealing bag, the sealing bag is pumped to a compressed state through a vacuum pump, and the pressure of the sealing bag and the pressure of the gas detection device reach a dynamic balance state.
Step 3) connecting the sealing unit with the gas detection device, and checking the air tightness of the sealing unit and the gas detection device;
and 4) putting the sealing unit into a constant-temperature water bath, keeping constant desorption temperature, enabling the pressure of the sealing unit and the pressure of the gas measuring device to reach a balanced state, and starting to measure the gas desorption amount.
The experiment temperature is set to be 20 ℃, the experiment time is set to be 150 days, desorption experiment data of each sample is recorded once a day, and the gas desorption amount of the gas coal sample is measured through the change of the liquid level height of the liquid burette every day. The volume of the liquid burette is 250ml plus or minus 0.2 ml. When the liquid in the equivalent pipe is exhausted, the rubber pipe is closed, and after water is added again, the rubber pipe is reconnected.
And simultaneously recording the water column height of the liquid burette and the atmospheric pressure of the laboratory as the basis of experimental data processing. After the experimental data is recorded, the actually measured gas desorption amount needs to be converted into the volume under the standard state for analysis and comparison. The processing experimental data of the standard state conversion formula 3 of the gas desorption amount under normal pressure can be obtained according to the GB/T23250-2009 coal seam gas content downhole direct determination method.
Wherein: qt- -total amount of gas desorbed in the standard state, cm3；Qt' - - - - - -actual measurement of gas desorption under experimental environmentAmount, cm3；tw-water temperature in the burette, DEG C; patmAtmospheric pressure, Pa; h isw-measuring the height of the water column in the tube in mm when reading the data; ps----twLower saturated water vapor pressure, Pa.
Residual coal gas desorption empirical formula with different particle sizes in goaf
The change rule of the experimental coal sample gas desorption speed along with time can well accord with the power function relation through calculation:
wherein: vt-gas desorption rate of coal sample at desorption time t, ml/g.d; t- - -the gas desorption time of the coal sample (t is more than or equal to 1), d; α, β -decay coefficient of gas desorption rate with time.
The expression of the correction coefficient of the influence of different temperatures on the coal sample gas desorption speed V is as follows:
wherein: eta < - - - > correction coefficient of temperature to desorption speed of granular coal gas; a. b- -regression coefficients; t- -gas desorption temperature, DEG C.
Therefore, the calculation formula of the gas desorption speed of the residual coal with different particle sizes in the goaf at different temperatures is as follows:
VT＝V20×η
wherein: vT-gas desorption rate at time T when desorption temperature is T, ml/g.d; v20-gas desorption rate at time t at desorption temperature 20 ℃, ml/g.d; t-desorption temperature of coal sample, DEG C; eta is the correction coefficient of the temperature to the gas desorption speed.
The calculation empirical formula of the accumulated desorption amount of the residual coal with different particle sizes in the goaf at different temperatures can be obtained by integrating the velocity formula:
wherein: alpha-60.9421 x 0.7433r+ 4.3575; t-gas desorption time of coal sample (t)>0) D; r-coal sample particle size, cm; eta is the correction coefficient of the temperature to the gas desorption speed.
The device for measuring the gas desorption amount of the residual coal with large block size in the goaf comprises a coal sample sealing unit, a gas measuring unit and a constant temperature unit as shown in figure 2; the coal sample sealing unit is connected with the gas measuring unit, and the gas measuring unit is used for measuring the gas desorption amount of the coal sample; the constant temperature unit is used for preserving heat of the coal sample sealing unit and measuring the gas desorption amount of the coal sample at different temperatures.
The coal sample sealing unit is a compressible vacuum sealing bag, and the pressure of the sealing bag and the pressure of the gas detection device reach a balanced state. The existing desorption experiment mainly adopts a metal coal sample seal tank to carry out the desorption experiment, and aims at the defects that the large-particle-size coal left in the goaf has the following defects:
1) in the past, most desorption experiments are performed after saturated adsorption, the gas pressure of a coal sample is high, the desorption rate is high, the original coal sample in the experiment of the paper has no saturated adsorption, the gas desorption amount is small, and the desorption gas is difficult to detect by adopting a metal sealed desorption tank. 2) In the past, small-particle-size pulverized coal is mostly used in experiments, so that dead space in experimental instruments is easy to remove, while large-particle-size lump coal is mostly used in the experiments, and the dead space of a coal sample tank is mostly used and is difficult to calculate. 3) The diameter of the tank opening of the coal sample tank is usually small, and large-particle-size lump coal cannot be put into the coal sample tank, so that the reprocessing cost is too high.
The compressible vacuum sealing bag is adopted as a sealing unit of the coal sample, and the vacuum bag sealing unit has the following advantages:
1) due to the flexibility of the sealing bag, the internal dead space can be effectively reduced, the sealing bag can be tightly attached to a coal sample, and the experimental accuracy is ensured. 2) Because atmospheric pressure exists, when the coal sample in the sealing bag diffuses out gas, the gas can flow to the gas measuring device in time, and a small amount of gas can be accurately measured. 3) The sealed coal sample bag is convenient to install and low in cost, and can be directly placed in a constant-temperature water bath for desorption measurement at different temperatures.
The schematic diagram of the operation of the coal sample sealing unit is shown in fig. 1, the coal sample is put into the sealing bag and then connected to the gas desorption measuring device, the device 1 is the coal sample sealing bag, the device 6 is the liquid burette, the experimental bag of the device 1 is pumped to the compression state by the vacuum pump, and the gas pressure inside the device is kept dynamically balanced with the gas measuring device of the device 6, so that if gas overflows from the coal sample, the gas pressure P in the device 1 can be caused1The gas flow is raised to destroy the original dynamic balance state, and the desorbed gas flows to the device 6, even a small amount of gas can be accurately measured, so that the gas flow can be measured for a long timeThe amount of stable desorption of the gas was determined. Due to the waterproof property of the sealed coal sample experiment bag, constant-temperature water bath and a negative pressure measuring device can be conveniently carried out when desorption is carried out at different temperatures or under different negative pressure conditions.
The constant temperature unit is a constant temperature water bath 2, the sealed coal sample is filled into a waterproof bag, the waterproof bag is completely immersed into the constant temperature water bath, long-time desorption gas test data of the coal sample at different temperatures are obtained by controlling the temperature of the constant temperature water bath, and the research of the temperature on the desorption influence effect of lump coal is carried out.
The measuring device also comprises a vacuum pump 4, a vacuum gauge 5, a valve 3, a valve I3 and a valve II 7; the vacuum pump is used for pumping the sealing unit to a compression state, and the vacuum meter is used for measuring the vacuum degree or the air pressure of the sealing unit and the gas detection device; the valve is used to control the airflow throughout the device.
The device has the following functions:
sealing preservation and gas measurement functions of coal sample
Because the experimental object is the remaining coal sample with different particle sizes in the goaf, the device ensures that the coal sample with different particle sizes can be continuously and stably desorbed in a stable closed environment without drying, degassing and saturated adsorption, and a small amount of desorbed gas can enter a desorption measuring device in time;
② constant temperature function
The function ensures that the coal sample can be stably desorbed at different temperatures by adjusting the temperature of the constant-temperature water bath, and the influence of the temperature on the desorption of the residual coal gas is measured.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A method for measuring the desorption amount of large-block-size residual coal gas in a goaf is characterized by comprising the following steps: the method comprises the following steps:
step 1) selecting naturally scattered coal samples with different particle sizes in a goaf, and classifying the coal samples according to the particle sizes;
step 2) respectively putting coal samples with different particle sizes into sealing units with different sizes, and sealing the sealing units;
step 3) connecting the sealing unit with a gas detection device, and checking the air tightness of the device;
and 4) putting the sealing unit into a constant-temperature water bath, keeping the constant desorption temperature, enabling the pressure of the sealing unit and the pressure of the gas measuring device to reach a balanced state, and starting to measure the gas desorption amount.
2. The method for measuring the desorption amount of the large-block-size residual coal gas in the goaf according to claim 1, wherein the method comprises the following steps: the coal sample is kept in the original state taken down from the working face and is hermetically transported to a laboratory without being subjected to drying, degassing and saturated adsorption processes, and desorption is carried out according to the original gas content of the coal sample.
3. The method for measuring the desorption amount of the large-block-size residual coal gas in the goaf according to claim 1, wherein the method comprises the following steps: and 2) sealing the sealing unit by adopting a vacuum sealing method, wherein the sealing unit is a sealing bag, the sealing bag is pumped to a compressed state by a vacuum pump, and the pressure of the sealing bag and the pressure of the gas detection device reach a dynamic balance state.
4. The method for measuring the desorption amount of the large-block-size residual coal gas in the goaf according to claim 1, wherein the method comprises the following steps: the change rule of the desorption speed of the coal sample gas along with time is as follows:
wherein, VtThe gas desorption speed of the coal sample when the desorption time is t is ml/g.d; t is the gas desorption time of the coal sample, t is more than or equal to 1, and unit d; alpha and beta are attenuation coefficients of the gas desorption speed along with time.
5. The method for measuring the desorption amount of the large-block-size residual coal gas in the goaf according to claim 1, wherein the method comprises the following steps: the desorption speed of the residual coal gas with different particle sizes at different temperatures is as follows:
VT＝V20×η
wherein,the desorption speed is the gas desorption speed at the time T when the desorption temperature is T; v20The desorption rate is the gas desorption rate at the time t when the desorption temperature is 20 ℃; t is the desorption temperature of the coal sample; eta is a correction coefficient of the temperature to the gas desorption speed,a. b is a regression coefficient, and T is a gas desorption temperature.
6. The method for measuring the desorption amount of the large-block-size residual coal gas in the goaf according to claim 1, wherein the method comprises the following steps: the empirical formula for calculating the accumulated desorption amount of the residual coal with different particle sizes at different temperatures is as follows:
wherein alpha is the attenuation coefficient of the gas desorption speed along with time, and alpha is 60.9421 multiplied by 0.7433r+ 4.3575; t is the gas desorption time of the coal sample, t is more than or equal to 1, and unit d; r is the coal sample particle size; eta is correction system of temperature to gas desorption rateThe number of the first and second groups is,a. b is a regression coefficient, and T is a gas desorption temperature.
7. The utility model provides a survey device of gob bulk density remains coal gas desorption volume which characterized in that: the device comprises a coal sample sealing unit, a gas measuring unit and a constant temperature unit; the coal sample sealing unit is connected with the gas measuring unit, and the gas measuring unit is used for measuring the gas desorption amount of the coal sample; the constant temperature unit is used for preserving heat of the coal sample sealing unit and measuring the gas desorption amount of the coal sample at different temperatures.
8. The apparatus for determining the desorption amount of the large-block-size residual coal gas in the goaf according to claim 7, wherein: the coal sample sealing unit is a compressible vacuum sealing bag, and the pressure of the sealing bag and the pressure of the gas detection device reach a balanced state.
9. The apparatus for determining the desorption amount of the large-block-size residual coal gas in the goaf according to claim 7, wherein: the constant temperature unit is a constant temperature water bath, the coal sample sealing unit is arranged in the constant temperature water bath, and the data of the long-time desorption gas of the coal sample at different temperatures are obtained by controlling the temperature of the constant temperature water bath.
10. The apparatus for determining the desorption amount of the large-block-size residual coal gas in the goaf according to claim 7, wherein: the measuring device also comprises a vacuum pump, a vacuum gauge and a valve; the vacuum pump is used for pumping the sealing unit to a compression state, and the vacuum meter is used for measuring the vacuum degree or the air pressure of the sealing unit and the gas detection device; the valve is used to control the airflow throughout the device.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0223357A3 (en) * | 1985-09-19 | 1988-06-22 | Canadian Patents and Development Limited | Delta p instrument for oxidation measurement |
| AU2009295190A1 (en) * | 2008-09-19 | 2010-03-25 | Earth Data Pty Limited | A device and method for determining fluid production |
| CN102436537A (en) * | 2011-08-03 | 2012-05-02 | 山西潞安环保能源开发股份有限公司 | Size distribution-based dropped-coal gas discharge volume prediction method |
| CN103558357A (en) * | 2013-10-25 | 2014-02-05 | 河南理工大学 | Experiment device for detecting influence of moisture on methane desorption rule |
| CN103776722A (en) * | 2013-12-31 | 2014-05-07 | 河南理工大学 | Testing method for content of coal seam methane sampled under negative-pressure environment |
-
2015
- 2015-07-14 CN CN201510413292.6A patent/CN105092410B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0223357A3 (en) * | 1985-09-19 | 1988-06-22 | Canadian Patents and Development Limited | Delta p instrument for oxidation measurement |
| AU2009295190A1 (en) * | 2008-09-19 | 2010-03-25 | Earth Data Pty Limited | A device and method for determining fluid production |
| CN102436537A (en) * | 2011-08-03 | 2012-05-02 | 山西潞安环保能源开发股份有限公司 | Size distribution-based dropped-coal gas discharge volume prediction method |
| CN103558357A (en) * | 2013-10-25 | 2014-02-05 | 河南理工大学 | Experiment device for detecting influence of moisture on methane desorption rule |
| CN103776722A (en) * | 2013-12-31 | 2014-05-07 | 河南理工大学 | Testing method for content of coal seam methane sampled under negative-pressure environment |
Non-Patent Citations (1)
| Title |
|---|
| 刘彦伟 等: ""粒度对软硬煤粒瓦斯解吸扩散差异性的影响"", 《煤炭学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644562A (en) * | 2016-09-14 | 2017-05-10 | 中国矿业大学(北京) | Simple and convenient method for detecting original content of gas |
| CN106885755A (en) * | 2017-01-10 | 2017-06-23 | 中国矿业大学 | A kind of underground coal mine quickly determines the method and apparatus of coal-bed gas parameter |
| CN109060593A (en) * | 2018-05-15 | 2018-12-21 | 菏泽学院 | A kind of portable coal mine gas bearing capacity measurement device |
| CN112282732A (en) * | 2020-10-29 | 2021-01-29 | 中煤科工集团重庆研究院有限公司 | Method for measuring occurrence of coal bed gas by using while-drilling gas parameters |
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