化工学报2016，Vol.67Issue(9)：3583-3589,7.DOI:10.11949/j.issn.0438-1157.20160227
急冷处理对CFB锅炉底渣脱硫特性的影响
Effect of rapid water-cooling process on desulfurization performance of CFB bottom ash
摘要
Abstract
A rapid water-cooling process to desulfurize high temperature CFB bottom ash was designed for the improvement of poor ash utilization. Apparatus and methods for bench-scale rapid water-cooling and desulfurizing study were established and CFB ashes with and without treatment were characterized for f-CaO content, microscopic structure, and desulfurization efficiency. Through theoretical analysis, a hypothesis, that rapid water-cooling could facilitate destroying shell of CaSO4 particles, was proposed and validated experimentally. Results of SEM/EDX and TGA analyses on treated and non-treated ashes showed that calcium on particle surface increased evidently and the calcium recycling rate could increase about 30% post water-cooling treatment. The desulfurization efficiency enhanced continuously with increasing temperature of CFB bottom ash before rapid water-cooling. When hot CFB ash entered into water, ash particles could burst and destroy CaSO4 shell due to strong thermal stress across particle surface. Since higher temperature of CFB ash prior to water-cooling would result in stronger thermal stress, CaSO4 shell were destroyed more easily and desulfurization efficiency became higher. Thus, the rapid water-cooling process would be a new method for regeneration and reuse of CFB ash by improving desulfurization efficiency, which certainly provided practical guidance for engineering applications.关键词
循环流化床/底渣/废物处理/再生/脱硫/急冷Key words
circulating fluidized bed/bottom ash/waste treatment/regeneration/desulfurization/rapid water-cooling分类
资源环境引用本文复制引用
李昊,陈午凤,王长安,车得福..急冷处理对CFB锅炉底渣脱硫特性的影响[J].化工学报,2016,67(9):3583-3589,7.基金项目
国家自然科学基金项目(51506163）；中央高校基本科研业务费专项资金项目（xjj2014041）。@@@@supported by the National Natural Science Foundation of China (51506163) and the Fundamental Research Funds for the Central Universities (xjj2014041) （51506163）；中央高校基本科研业务费专项资金项目（xjj2014041）。@@@@supported by the National Natural Science Foundation of China (51506163）
