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Combustion of Rice Husk in a Multiple-Spouted Fluidized Bed

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The performance of the multiple-spouted fluidized bed was evaluated by investigating the effects of different parameters on combustion efficiency and emission for different methods of feeding. The parameters considered were the different levels of combustion air and the different primary-to-secondary air ratios at each level, while the methods of feeding were under-bed and over-bed feeding. It was found that the method of feeding influenced the combustion efficiency of the multiple-spouted bed. The combustion efficiency appeared to be higher with under-bed feeding as compared to over-bed feeding; and emission of CO was less in the case of under-bed feeding than with over-bed feeding. The changes in excess air levels influenced the combustion efficiency of the spouted bed. It was found that combustion efficiency with over-bed feeding was best at 10% excess air; in general, combustion efficiency with under-bed feeding was favorable at 20% excess air level.
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Keywords: combustion efficiency; fluidized bed; multiple-spouted fluidized bed; rice husk combustion; spouted beds

Document Type: Research Article

Affiliations: Energy Program, School of Environment Resources and Development (SERD), Asian Institute of Technology, Klong Luang, Pathumthani, Thailand

Publication date: September 1, 2003

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