Combustion and emission characteristics of a swirling fluidized-bed combustor burning moisturized rice husk

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• 作者：Vladimir I. Kuprianov ; Rachadaporn Kaewklum ; Kasama Sirisomboon ; Porametr Arromdee ; Songpol Chakritthakul
• 关键词：Swirl motion ; Temperature ; CO and NO concentrations ; Axial and radial profiles ; Combustion efficiency
• 刊名：Applied Energy
• 出版年：2010
• 出版时间：September 2010
• 年：2010
• 卷：87
• 期：9
• 页码：2899-2906
• 全文大小：857 K

文摘

Burning of rice husk in a swirling fluidized-bed combustor (SFBC) was the focus of this experimental study. Swirl motion of a fluidized bed in this combustor was induced by an annular spiral distributor of primary air and also promoted by tangential injection of secondary air into the bed splash zone. “As-received” rice husk was moisturized with the aim to control NO emission from the combustor. The SFBC was tested at a constant fuel feed rate (of about 80 kg/h) for six fuel-moisture contents (from 8.4 % to 35 % ). In each test series for the particular fuel quality, excess air was ranged from about 20 % to 80 % . Radial and axial profiles of temperature and gas concentrations (O₂, CO and NO) were plotted for different fuel options and operating conditions with the aim to study pollutants formation and reduction in different regions of the SFBC. With increasing the fuel-moisture content, the emission of NO from the combustor apparently reduced, while the emission of CO was adjusted at a quite low level due to the effects of secondary air. An effective least-cost control of both NO and CO emissions and high (over 99 % ) combustion efficiency are achievable when firing moisturized rice husk in this SFBC.