Effect of Coal Fly Ash Additive on Sulfur Retention of Coal Briquette

摘要：

SO2 from the emissions of coal combustion is one of the major air pollutants and many techniques have been developed or are under investigation to effectively and economically remove them.Clean coal briquette is one of the most effective techniques because of the addition of sulfur-retention agent in coal briquette making it can fix sulfur in coal residuals during coal combustion.The sulfur-retention agents developed at present are calcium-based mainly,such as calcium oxide,calcium hydroxide.The products produced from the reactions of sulfur in coal and sulfur-retention agents during coal briquette combustion,however,are thermolabile at temperatures of >800 oC,which caused the rates of sulfur retention is very low and thus limit the further application of coal briquette.Coal fly ash contains the components,such as SiO2,Al2O3,Fe2O3 and alkali and alkali earth metal oxides,which maybe favor the productions of more stable sulfate species.The behaviors and mechanisms of coal fly ash affect on sulfur retention have been discussed in this article.The results show that: (1) Compared with the original fly ash,activated fly ash increase the sulfur retention rate of coal briquette effectively.(2) Activated fly ash react with sulfur in coal into high thermostable compounds Ca5(SiO4)2SO4 during coal briquette combustion which restrain the decomposition of sulfate species

关键词： sulfur retention:coal briquette:coal fly ash:additive

作者: Yanxia Guo Yingying Li Fangqin Cheng

作者单位: The College of Enviromental Sciences and Resources,Shanxi University,Taiyuan 030006,China The College of Enviromental Sciences and Resources,Shanxi University,Taiyuan 030006,China Research C Research Centre for Environmental Science and Engineering,Shanxi University,Taiyuan 030006,China

会议类型: 国际会议

会议名称: The 8th International Symposium on Gas Cleaning at High Temperatures(第八届国际高温气体净化技术研讨会 GCHT-8)

会议地点: 太原

会议语种:英文

页码: 602-608

在线出版日期: 2010-08-23（万方平台首次上网日期，不代表论文的发表时间）