Sorption and Micro-Scale Strength Properties of Coals Susceptible to Outburst Caused by Changes in Degree of Coalification
| Autor: | Katarzyna Godyń, Barbara Dutka |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science Diffusion Mineralogy Young's modulus complex mixtures Methane Article Degree (temperature) chemistry.chemical_compound symbols.namesake outburst hazard otorhinolaryngologic diseases General Materials Science Coal coal coalification degree Microscopy QC120-168.85 business.industry methane QH201-278.5 Coal mining technology industry and agriculture Sorption respiratory system Engineering (General). Civil engineering (General) TK1-9971 respiratory tract diseases sorption capacity effective diffusion coefficient chemistry Descriptive and experimental mechanics symbols microhardness Gravimetric analysis Electrical engineering. Electronics. Nuclear engineering TA1-2040 business |
| Zdroj: | Materials; Volume 14; Issue 19; Pages: 5807 Materials, Vol 14, Iss 5807, p 5807 (2021) Materials |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14195807 |
| Popis: | Coals from the south-western part of the Upper Silesian Coal Basin have a strong outburst susceptibility. The objective of this study was to identify the influence of coalification degree on methane sorption and micro scale strength properties of 24 coals from Jastrzębie Zdrój. Coal samples showed a reflectance Ro between 0.98 and 1.25%. Sorption measurements were carried out by gravimetric method. Sorption capacities were determined at mean deposit temperature of 35 °C. Using the unipore model and solution of Fick’s second law, the effective diffusion coefficients of methane in the studied coals were obtained. The Vickers method was used to study the microhardness and the modulus of elasticity. It has been shown that the increase in the coalification degree reduces the sorption capacity of coal and also reduces the rate of methane emission. Coals the most susceptible to outbursts, were the most brittle. With the increase in Ro, the methane seam pressure p increased as well as desorbable methane content DMC, both due to the reduction in the sorption capacity of coal. The increased dp index is a warning sign indicating an increased total methane content of coal seam, an increased seam pressure or an alternation of coal structure. |
| Databáze: | OpenAIRE |
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