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Burnout Behaviour of Bituminous Coals in Air‐Staged Combustion Conditions
Author(s) -
Kluger F.,
Spliethoff H.,
Hein K. R. G.
Publication year - 2001
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500090306
Subject(s) - bituminous coal , coal , burnout , combustion , residence time (fluid dynamics) , particle size , materials science , particle (ecology) , waste management , environmental science , environmental engineering , mineralogy , nuclear engineering , chemical engineering , chemistry , engineering , geotechnical engineering , automotive engineering , geology , oceanography , organic chemistry
In order to determine the influence on burnout by the combustion conditions and the coal preparation, three bituminous coals sold on the world market, from three different locations, in Poland, South Africa, and Australia, were studied more closely. For this purpose, the coals were ground in two different particle size ranges, which, besides the influence of the combustion conditions, such as temperature, residence time, and stoichiometry, made it possible to also investigate the impact on burnout by the coal preparation. The experiments were carried out in an electrically heated entrained‐flow reactor with a thermal input of 8.5 kW. The parameters for the experiments are wall temperature (1000 ‐ 1350d̀C), air ratio (0.6–1.15), and two particle sizes (70% < 75m̈m, 90% < 75m̈m). The results show that in general, for increasing temperatures, the burnout quality will improvel. For the Australian Illawara coal, another outcome is increased NO x emissions. Lowering the air ratio in the reduction zone leads to less NO x emission but to increased unburnt matter in ash. For the smaller particle size fraction, the analysis of the different particle sizes shows an improvement of the burnout without a change in NO x emissions.