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喷射凹凸棒土悬浊液对循环流化床燃煤PM2.5排放的影响

DOI: 10.13334/j.0258-8013.pcsee.2015.17.015, PP. 4408-4416

Keywords: 循环流化床,凹凸棒土,悬浊液,颗粒团聚,PM2.5

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Abstract:

在循环流化床试验装置上考察尾部烟道喷射凹凸棒土悬浊液情况下燃煤细颗粒物(PM2.5)排放规律。具体为在燃烧温度为900℃,入炉煤粒径为0.6~1.5mm的条件下,考察悬浊液流量、雾化空气与团聚剂悬浊液的质量比以及凹凸棒添加量等对PM2.5的排放特性影响,同时对细颗粒物的微观形貌及元素组成进行分析。结果表明,喷射凹凸棒土可以有效降低煤燃烧PM2.5的排放量。随着悬浊液流量和凹凸棒土添加量的增加,PM2.5数量密度和质量浓度均降低,颗粒粒径有从亚微米向超微米转移的趋势。增大雾化空气与团聚剂悬浊液的质量比有利于颗粒物团聚,也使得尾部烟气中PM2.5数量大幅减少。从PM2.5的粒径分布、形貌分析和元素迁移规律可知,凹凸棒土促进了颗粒物团聚捕集,从而有利于减少PM2.5的排放,实现对其有效控制。

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