Fuel size effect on pinewood combustion in a packed bed |
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Authors: | Yao Bin Yang Changkook Ryu Adela Khor Vida N Sharifi Jim Swithenbank |
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Affiliation: | Department of Chemical and Process Engineering, Sheffield University Waste Incineration Centre (SUWIC), Sheffield University, Mappin Street, Sheffield S1 3JD, UK |
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Abstract: | In this paper, particle size effect on pinewood combustion in a stationary packed bed was investigated. Mass loss rate, temperature profile at different bed locations and gas compositions in the out-of-bed flue gases were measured at a fixed primary air flow rate. Pinewood cubes was fired with size ranging from 5 to 35 mm. A unique numerical model applicable to thermally thick particles was proposed and relevant equations were solved to simulate the non-homogeneous characteristics of the burning process. It is found that at the operating conditions of the current study, smaller particles are quicker to ignite than larger particles and have distinctive combustion stages; burning rate is also higher with smaller fuel size; and smaller fuels have a thinner reaction zone and result in both higher CO and CH4 concentrations in the out-of-bed flue gases; on the other hand, larger particles produced a higher flame temperature and result in higher H2 concentration in the flue gases. Larger particles also cause the combustion process becoming more transient where the burning rate varies for most part of the combustion process. |
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Keywords: | Combustion Fuel size Pinewood Mathematical modelling |
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