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Author: search.filters.author.Permchart, W.Subject: search.filters.subject.Temperature

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    Preliminary investigation on combustion characteristics of rice husk in FBC
    (2009-08-01)
    Permchart, W.
    ;
    Tanatvanit, S.
    The experimental results on combustion of rice husk in a conical fluidized bed combustor (referred to as the conical FBC) using silica sand as the bed material are presented in this paper. The effects of excess combustion air and combustor loading as well as the sand bed height on the combustion pattern in FBC were investigated. Temperatures and gas concentrations (CO and NO) along over the combustor height as well as in the flue gas downstream from the ash collecting cyclone were measured. The results showed that the axial temperature profiles in FBC were explicitly affected by the combustor loading whereas the excess air and bed height were found to have minor influences on the temperature pattern. Meanwhile, the combustor loading and the excess air significantly affected the axial CO and NO concentration profiles; however, these profiles were almost independent of the bed height. The combustion and thermal efficiencies for this FBC were quantified for different operating conditions.
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    Co-firing of sugar cane bagasse with rice husk in a conical fluidized-bed combustor
    (2006-03-01)
    Kuprianov, V. I.
    ;
    Janvijitsakul, K.
    ;
    Permchart, W.
    This paper presents experimental results on co-firing of 'as-received' sugar cane bagasse and rice husk in a conical fluidized-bed combustor (FBC) using silica sand as the bed material. Axial temperature, O<inf>2</inf>, CO <inf>2</inf>, CO and NO concentration profiles in the conical FBC operated at 82.5-82.8 kg/h fuel feed rate and various values of excess air (of about 40, 60, 80 and 100%) for different rice husk energy fractions (of 0.60, 0.85 and 1.0) are discussed. The bed temperature, CO and NO emissions from the combustor, as well as the heat losses and combustion efficiency, are also provided for the above operating conditions. The axial temperature profiles in the conical FBC were almost independent of excess air but noticeably affected by the rice husk energy fraction. The CO emissions were found to reduce for higher values of excess air and rice husk energy fractions. Meanwhile, the NO concentrations at all the points over the combustor volume and, accordingly, NO emissions from the reactor increased with higher excess air and energy contributions by rice husk. The co-firing of these fuels in the conical FBC at the rice husk energy fractions greater than 0.6 resulted in the sustainable combustion, with 95-96% combustion efficiency, and lower NO emissions compared with those for firing pure rice husk. Through co-firing with rice husk, an effective use of 'as-received' sugar cane bagasse becomes feasible for energy conversion in the fluidized-bed combustion systems. © 2005 Elsevier Ltd. All rights reserved.