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Article

Experimental Investigations of the Ignitability of Several Coal Dust Qualities

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University of Stuttgart, Institute of Combustion and Power Plant Technology, Pfaffenwaldring 23, 70569 Stuttgart, Germany
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Adinex N.V., Brouwerijstraat 11, Noorderwijk-Herentals, B-2200 Herentals, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Andrzej Teodorczyk
Energies 2021, 14(19), 6323; https://doi.org/10.3390/en14196323
Received: 26 August 2021 / Revised: 24 September 2021 / Accepted: 27 September 2021 / Published: 3 October 2021
(This article belongs to the Section I2: Energy and Combustion Science)
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 (pmax), the deflagration index (Kst-value) and the modified ignitability characteristic number (ZWZmod.) 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 Kst and ZWZmod. 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. View Full-Text
Keywords: dust explosion characteristics; the ignitability characteristic number; lignite dust; moisture content; ash content; median particle size dust explosion characteristics; the ignitability characteristic number; lignite dust; moisture content; ash content; median particle size
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MDPI and ACS Style

Youssefi, R.; Segers, T.; Norman, F.; Maier, J.; Scheffknecht, G. Experimental Investigations of the Ignitability of Several Coal Dust Qualities. Energies 2021, 14, 6323. https://doi.org/10.3390/en14196323

AMA Style

Youssefi R, Segers T, Norman F, Maier J, Scheffknecht G. Experimental Investigations of the Ignitability of Several Coal Dust Qualities. Energies. 2021; 14(19):6323. https://doi.org/10.3390/en14196323

Chicago/Turabian Style

Youssefi, Reyhane, Tom Segers, Frederik Norman, Jörg Maier, and Günter Scheffknecht. 2021. "Experimental Investigations of the Ignitability of Several Coal Dust Qualities" Energies 14, no. 19: 6323. https://doi.org/10.3390/en14196323

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