Experimental Investigation of the Adsorption Characteristics of Mixed Coal and Variations of Specific Surface Areas before and after CH4 Adsorption
| Autor: | Yongyong Jia, Jia Lin, Haifei Lin, Shugang Li, Pengxiang Zhao, Meiqi Yuan, Min Yan, Hui Liu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
safety
outburst 020209 energy virgin coal Mineralogy specific surface area 02 engineering and technology lcsh:Technology complex mixtures lcsh:Chemistry Adsorption 020401 chemical engineering Specific surface area 0202 electrical engineering electronic engineering information engineering otorhinolaryngologic diseases General Materials Science Coal 0204 chemical engineering lcsh:QH301-705.5 Instrumentation Fluid Flow and Transfer Processes gas emission lcsh:T business.industry Process Chemistry and Technology General Engineering Coal mining technology industry and agriculture Sorption respiratory system lcsh:QC1-999 Computer Science Applications respiratory tract diseases CH4 adsorption Tectonics lcsh:Biology (General) lcsh:QD1-999 Volume (thermodynamics) lcsh:TA1-2040 Environmental science tectonic coal lcsh:Engineering (General). Civil engineering (General) business lcsh:Physics |
| Zdroj: | Applied Sciences Volume 9 Issue 3 Applied Sciences, Vol 9, Iss 3, p 524 (2019) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app9030524 |
| Popis: | Tectonic coal is a kind of soft coal that is generated during tectonic movement. Gas outbursts usually occur in seams containing both virgin coal and tectonic coal. To reveal the adsorption characteristics of this type of coal seam (containing both virgin coal and tectonic coal), both tectonic coal and virgin coal were collected from the same longwall face and a series of laboratory tests were conducted, including coal sorption tests and pore specific surface measurements. Both the tectonic coal and virgin coal were crushed into coal powder (0.18–0.25 mm) for the coal sorption tests. In these laboratory tests, different mass ratios between tectonic coal and virgin coal were tested. We found that with the increase of the percentage of tectonic coal, the adsorption volume showed a rising trend, reached its maximum value, and then decreased. The specific surface areas of the mixed coal samples had the same evolution trends as those of the adsorption volume. From the laboratory tests, we found that when the mass ratio of virgin coal to tectonic coal was 1:1, both the adsorption volume and the specific surface areas reached their maximum values. Due to the percentage variation of the tectonic coal in the panel with the advancement of the longwall face, when the tectonic coal accounted for 50% of the total coal, the gas content would rise. Thus, proper measures should be adopted for outburst hazards control. The mathematical model between the change of specific surface area and the stress and strain of pore expansion before and after gas adsorption was established, and the relationship between the change of pore structure and gas emission before and after gas adsorption was obtained. It provides a theoretical basis for further research on coal and gas outburst mechanisms. |
| Databáze: | OpenAIRE |
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