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Char combustion parameters that significantly affect the in-bed combustion of char in PFBC were determined experimentally using a batch-fed PFBC. The ratio of carbon to oxygen consumed on the surface of a burning char particle was determined and it was concluded that CO was the only product of char combustion in PFBC.Model simulations revealed that, for PFBC, mass transfer controlled the combustion...
The combustion efficiency of Australian coals in PFBC is being studied in a batch-fed rig. Elutriation of unburnt char is the main source of combustion inefficiency and is proportional to the char loading in the bed. Hence, in-bed char combustion is being studied to identify those coal-related factors which significantly affect the in-bed char loading and thereby combustion efficiency. This paper...
Fundamental aspects of coal combustion in the two types of atmospheric fluidized combustors, i.e. those based on bubbling and on circulating technologies, have been studied in order to determine those variables which play a dominant role in the reactor performance. The analysis is based on two relatively simple models, which take into account carbon surface reaction, intraparticle and external diffusion...
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