ORIGINAL PAPER
Changes in the spontaneous combustion tendency of humic coals according to their petrographic composition and physico-chemical properties
1
AGH University of Science and Technology in Kraków
Submission date: 2020-03-25
Final revision date: 2020-04-16
Acceptance date: 2020-05-01
Publication date: 2020-06-29
Gospodarka Surowcami Mineralnymi – Mineral Resources Management 2020;36(2):197-218
KEYWORDS
TOPICS
Scientific background of mineral resource managementStrategy and methodology of mineral prospecting and exploration
ABSTRACT
The article presents the analysis of the correlation between the self-ignition parameters and the ultimate and proximate analysis, as well as the petrographic properties of Polish lignite, sub-bituminous coal, bituminous coal and anthracite. The following coal properties were determined: the moisture, ash content, volatile matter and sulfur content, gross calorific value, net calorific value, C, O, N and H contents, total porosity, ash oxide composition, rates of spontaneous combustion in 237°C and 190°C, and activation energy. During the petrographic analysis, maceral composition and random reflectance were determined. To determine the linear correlation between the self-ignition parameters and the analyzed coal properties, the Pearson correlation coefficient was calculated. The results show that there is no strong linear correlation between the lignite tendency to self-ignition and its petrographic properties. However, a strong negative correlation between the rate of spontaneous combustion and moisture and volatile matter content was observed. In the case of bituminous coal, strong correlations between self-combustion parameters and various coal properties were confirmed. The most noteworthy are the correlations between self-ignition parameters and the maceral composition, that is, between the content of macerals of the inertinite group in coal and content of macerals of the huminite/vitrinite group. The obtained results suggest that the spontaneous combustion tendency of coal increases with the increasing content of semifusinite and liptinite.
METADATA IN OTHER LANGUAGES:
Polish
Wpływ parametrów fizyko-chemicznych i petrograficznych węgla humusowego na jego skłonność do samozapłonu
węgiel, samozapłon, samozagrzewanie, energia aktywacji, petrografia
W artykule przedstawiono analizę korelacji między parametrami samozapłonu a analizą technologiczną i chemiczną oraz właściwościami petrograficznymi polskiego węgla brunatnego, węgla kamiennego i antracytu. Określono następujące właściwości węgla: wilgotność, zawartość popiołu, zawartość części lotnych i siarki, wartość opałową, ciepło spalania, zawartość C, O, N i H, całkowitą porowatość, skład tlenkowy popiołu, wskaźniki samozapłonu w temperaturach 237 i 190°C oraz energię aktywacji. Podczas analizy petrograficznej określono skład petrograficzny i współczynnik odbicia. W celu określenia liniowej korelacji między parametrami samozapłonu a analizowanymi właściwościami węgla obliczono współczynnik korelacji Pearsona. Uzyskane wyniki pokazują, że nie ma silnej korelacji liniowej między tendencją węgla do samozapłonu a jego właściwościami petrograficznymi. Zaobserwowano jednak silną ujemną korelację między samozapłonem a wilgotnością i zawartością substancji lotnych. W przypadku węgla kamiennego potwierdzono silne korelacje między parametrami samozapłonu a różnymi właściwościami węgla. Najbardziej godne uwagi są korelacje między parametrami samozapłonu a składem petrograficznym, tj. pomiędzy zawartością macerałów grupy inertynitu w węglu oraz zawartością macerałów grupy huminitu/witrynitu w węglu. Uzyskane wyniki sugerują, że tendencja do samozapłonu węgla rośnie wraz ze wzrostem zawartości semifuzynitu i liptynitu.
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