Experimental Investigations of the Ignitability of Several Coal Dust Qualities

Reyhane Youssefi, Tom Segers, Frederik Norman, Jörg Maier and Günter Scheffknecht
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Reyhane Youssefi: University of Stuttgart, Institute of Combustion and Power Plant Technology, Pfaffenwaldring 23, 70569 Stuttgart, Germany
Tom Segers: Adinex N.V., Brouwerijstraat 11, Noorderwijk-Herentals, B-2200 Herentals, Belgium
Frederik Norman: Adinex N.V., Brouwerijstraat 11, Noorderwijk-Herentals, B-2200 Herentals, Belgium
Jörg Maier: University of Stuttgart, Institute of Combustion and Power Plant Technology, Pfaffenwaldring 23, 70569 Stuttgart, Germany
Günter Scheffknecht: University of Stuttgart, Institute of Combustion and Power Plant Technology, Pfaffenwaldring 23, 70569 Stuttgart, Germany

Energies, 2021, vol. 14, issue 19, 1-15

Abstract: The ignition characteristics of coal dust is of high importance for the flame stability in coal-fired power plants. We investigate the ignitability of six lignite dust qualities and one hard coal using dust explosion tests and an ignitability characteristic number. The paper aims to identify the degree of impact of the properties of coals, such as the moisture content, the ash content etc., on the ignition characteristics and ultimately to compare the identified relevant ignition parameters to the ignition performance of the dust qualities in an industrially relevant environment. The minimum cloud ignition temperature (MCIT), the maximum rate of pressure rise (( dp / dt ) max ), the maximum explosion pressure ( p max ), the deflagration index (K st -value) and the modified ignitability characteristic number (ZWZ mod. ) were determined and were attributed to the moisture content, the ash content and the median particle size. The MCIT was largely influenced by the volatile content, whereas the variations of moisture and ash contents within the range of 10% to 20% did not have a significant impact on the MCIT. The maximum explosion pressure did not differ considerably and stayed in a narrow range among the tested dust qualities. The deflagration index showed a higher sensitivity to the dust properties. The deflagration index and the modified ignitability characteristics number dropped as the moisture content increased and the volatile content reduced. The K st and ZWZ mod. values showed the highest susceptibility to the coal dust properties. Hence, they were used as representative parameters for further comparison with the ignition performance of coal dust in a pilot-scale testing. The results showed that both parameters predicted the ignition performance relatively well and can be used as indicators for the prediction of the ignition performance.

Keywords: dust explosion characteristics; the ignitability characteristic number; lignite dust; moisture content; ash content; median particle size (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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