A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory
Coal seam gas content is frequently measured in quantity during underground coal mining operation and coalbed methane (CBM) exploration as a significant basic parameter. Due to the calculation error of lost gas and residual gas in the direct method, the efficiency and accuracy of the current methods...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-11-01
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| Series: | International Journal of Mining Science and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268620301361 |
| _version_ | 1818399897221595136 |
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| author | Yanwei Liu Yang Du Zhiqiang Li Fajun Zhao Weiqin Zuo Jianping Wei Hani Mitri |
| author_facet | Yanwei Liu Yang Du Zhiqiang Li Fajun Zhao Weiqin Zuo Jianping Wei Hani Mitri |
| author_sort | Yanwei Liu |
| collection | DOAJ |
| description | Coal seam gas content is frequently measured in quantity during underground coal mining operation and coalbed methane (CBM) exploration as a significant basic parameter. Due to the calculation error of lost gas and residual gas in the direct method, the efficiency and accuracy of the current methods are not inadequate to the large area multi-point measurement of coal seam gas content. This paper firstly deduces a simplified theoretical dynamic model for calculating lost gas based on gas dynamic diffusion theory. Secondly, the effects of various factors on gas dynamic diffusion from coal particle are experimentally studied. And sampling procedure of representative coal particle is improved. Thirdly, a new estimation method of residual gas content based on excess adsorption and competitive adsorption theory is proposed. The results showed that the maximum error of calculating the losing gas content by using the new simplified model is only 4%. Considering the influence of particle size on gas diffusion law, the particle size of the collected coal sample is below 0.25 mm, which improves the measurement speed and reflects the safety representativeness of the sample. The determination time of gas content reduced from 36 to 3 h/piece. Moreover, the absolute error is 0.15–0.50 m3/t, and the relative error is within 5%. A new engineering method for determining the coal seam gas content is developed according to the above research. |
| first_indexed | 2024-12-14T07:27:58Z |
| format | Article |
| id | doaj.art-fd94a58f36db42b7858bb5c71ae65dcd |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-12-14T07:27:58Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-fd94a58f36db42b7858bb5c71ae65dcd2022-12-21T23:11:28ZengElsevierInternational Journal of Mining Science and Technology2095-26862020-11-01306799810A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theoryYanwei Liu0Yang Du1Zhiqiang Li2Fajun Zhao3Weiqin Zuo4Jianping Wei5Hani Mitri6School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo 454000, China; Department of Mining and Materials Engineering, McGill University, Montreal H3A0E8, Canada; Corresponding author.School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo 454000, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo 454000, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo 454000, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo 454000, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo 454000, ChinaDepartment of Mining and Materials Engineering, McGill University, Montreal H3A0E8, Canada; School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, ChinaCoal seam gas content is frequently measured in quantity during underground coal mining operation and coalbed methane (CBM) exploration as a significant basic parameter. Due to the calculation error of lost gas and residual gas in the direct method, the efficiency and accuracy of the current methods are not inadequate to the large area multi-point measurement of coal seam gas content. This paper firstly deduces a simplified theoretical dynamic model for calculating lost gas based on gas dynamic diffusion theory. Secondly, the effects of various factors on gas dynamic diffusion from coal particle are experimentally studied. And sampling procedure of representative coal particle is improved. Thirdly, a new estimation method of residual gas content based on excess adsorption and competitive adsorption theory is proposed. The results showed that the maximum error of calculating the losing gas content by using the new simplified model is only 4%. Considering the influence of particle size on gas diffusion law, the particle size of the collected coal sample is below 0.25 mm, which improves the measurement speed and reflects the safety representativeness of the sample. The determination time of gas content reduced from 36 to 3 h/piece. Moreover, the absolute error is 0.15–0.50 m3/t, and the relative error is within 5%. A new engineering method for determining the coal seam gas content is developed according to the above research.http://www.sciencedirect.com/science/article/pii/S2095268620301361Coal seam gas contentDynamic diffusion modelDetermination methodLost gas contentDesorption characteristics |
| spellingShingle | Yanwei Liu Yang Du Zhiqiang Li Fajun Zhao Weiqin Zuo Jianping Wei Hani Mitri A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory International Journal of Mining Science and Technology Coal seam gas content Dynamic diffusion model Determination method Lost gas content Desorption characteristics |
| title | A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory |
| title_full | A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory |
| title_fullStr | A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory |
| title_full_unstemmed | A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory |
| title_short | A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory |
| title_sort | rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory |
| topic | Coal seam gas content Dynamic diffusion model Determination method Lost gas content Desorption characteristics |
| url | http://www.sciencedirect.com/science/article/pii/S2095268620301361 |
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