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Combustion characteristics and the quality of rice husk ash at different feeding methods in a fluidized bed combustor

Tan, K.G. (2008) Combustion characteristics and the quality of rice husk ash at different feeding methods in a fluidized bed combustor. Journal of Chemical and Natural Resources Engineering, 2 (Special Edition). pp. 101-116. ISSN 1823-5255

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Feeding of low-density materials such as rice husk into the fluidised bed combustor is difficult as they tend to be elutriated into the freeboard region prior to completion of combustion. As such, in practice, they are usually force-fed as near as possible into the hot bubbling bed region to achieve a higher burnout rate. In this study, the effects of feeding methods on the combustion characteristics of rice husk and their resulting ash quality were investigated. Two methods of feeding were employed, namely inclined feeding port and another through an inclined, tangential feeding port. Experimental results showed that fly ash from both experiments were amorphous and almost similar in terms of residual carbon content (1.9 wt %). The major differences were that when feeding was through the inclined feeding port, most of the ash was collected as fly ash and the size were coarser (in the form of slightly broken skeletons). The tangential velocity component in the combustor arising from the tangential feeding route caused the ash to be trapped at the swirling flow region above the bed, thereby retaining most of the ash particles as bottom ash (approximately 75% of the resulting ash). Further, the high degree of turbulence at the swirling flow region, coupled with the high degree of rice husk penetration in the bed, resulted in fly and bottom ashes which were much finer in size. Further, based on these results, it was concluded that combustion of rice husk by feeding through the inclined feeding port was more desirable due to the stable, uniform combustor temperatures and ease of ash collection via the cyclone throughout the combustion process.

Item Type:Article
Additional Information:Safer and Cleaner Technology
Uncontrolled Keywords:fluidised bed, rice husk, combustion, residual carbon, ash quality, feeding method
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Natural Resources Engineering (Formerly known)
ID Code:8968
Deposited On:25 Jun 2009 01:49
Last Modified:02 Jun 2010 01:58

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