钾对生物质燃烧过程积灰的影响  

Influence of Potassium on Ash Deposition during Biomass Combustion

作　　者：龙兵[1] 刘志强[1] 赵腾磊[1] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083

出　　处：《应用能源技术》2011年第6期34-39,共6页Applied Energy Technology

基　　金：中南大学科技创新基金(206001141);<湖南省秸秆综合利用规划>(2009-2015)

摘　　要：对生物中钾的赋存形式及其沉积过程进行分析得出钾含量高且反应性高是影响积灰形成的关键因素。研究了钾对飞灰特性的影响以及烟气中钾浓度对积灰的影响,研究结果表明,钾促进了积灰的形成。钾促进积灰形成的主要途径是:钾与硅酸盐结合形成低熔点化合物促进灰粒间的烧结;钾沉积在飞灰颗粒的表面增加了飞灰的表面粘性。最后介绍了几种减轻钾对积灰形成的影响的方法。The occurrence and deposition process of potassium were analyzed,which showed that potassium with high content and high chemical reactivity is the key factor that affects ash deposition.The effect of potassium on the characteristics of ash and on ash deposition was extensively discussed,and the results indicated that potassium promotes ash deposition.The significant increase of deposition tendency can be attributed to two routes： the combination of aluminosilicate with the potassium that forms new eutectics with a lower melting temperature;the surface growth of potassium on big ash particles surface or the adhesion of submicron potassium oxides to big particles increase their work of adhesion.Finally,it introduced several ways of reducing the influence of potassium on ash deposition.

关 键 词：生物质 积灰 钾 钾浓度 

分 类 号：TK6[动力工程及工程热物理—生物能]