Combustion of coal, bagasse and blends thereof: Part I: Emissions from batch combustion of fixed beds of fuels

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• 作者：Marcia Bragato^a ; ^c ; Kulbhushan Joshi^c ; Joel B. Carlson^b ; Jorge A.S. Tenó ; rio^a ; Yiannis A. Levendis^c ; ^{y.levendis@neu.edu}
• 关键词：Coal ; Biomass ; Bagasse ; Co-combustion ; Emissions
• 刊名：Fuel
• 出版年：2012
• 期刊代码：33_00162361
• 类别：ce
• 出版时间：June, 2012
• 卷：96
• 期：Complete
• 页码：43-50
• 文件大小：1367 K

摘要

Batch combustion of fixed beds of coal, bagasse and blends thereof took place in a pre-heated two-stage electric laboratory furnace, under high-heating rates. The average input fuel/air equivalence ratios were similar for all fuels. The primary and secondary furnace temperatures were varied from 800 掳C to 1000 掳C. The effects of fuel blending, combustion staging, and operating furnace temperatures on the emissions from the two fuels were assessed. Furnace effluents were analyzed for carbon dioxide and for products of incomplete combustion (PIC) including CO, volatile and semi-volatile hydrocarbons, as well as particulate matter. Results showed that whereas CO₂ was generated during both the observed sequential volatile matter and char combustion phases of the fuels, PICs were only generated during the volatile matter combustion phase. CO₂ emissions were the highest from coal, whereas CO and other PIC emissions were the highest from bagasse. Under this particular combustion configuration, combustion of the volatile matter of the blends resulted in lower yields of PIC, than combustion of the volatiles of the neat fuels. Though CO and unburned hydrocarbons from coal as well as from the blends did not exhibit a clear trend with furnace temperature, such emissions from bagasse clearly increased with temperature. The presence of the secondary furnace (afterburner) typically reduced PIC, by promoting further oxidation of the primary furnace effluents.