生物质与煤混合燃烧过程中灰沉积特性的研究

在生物质与煤混合燃烧过程中,生物质中的碱金属和Cl是引起锅炉受热面严重灰沉积的根本原因。通过对灰沉积过程和沉积机理的综合分析,表明碱金属和Cl的析出对灰沉积过程起主要作用;在混燃过程中,不同燃料的灰分之间会发生反应:析出的碱金属氯化物会被SO2硫酸盐化,或与煤中的矿物质发生反应生成高熔点的碱金属硅铝酸盐,从而在一定程度上抑制了锅炉表面的灰沉积。同时探讨了混燃过程中灰沉积特性的影响因素,认为燃料特性、混合比例和燃烧温度对灰沉积特性影响显著。

Study on Characteristics of Ash Deposition during Co-combustion of Biomass and Coal

The alkali metals and chlorine of the biomass are basic reason to cause serious ash deposition in the heater surface of the boiler during the co-combustion of biomass and coal.Through the comprehensive analysis to the process and the mechanism of the ash deposition,it is found that the release of the alkali metals and Cl play an important role in the process of ash deposition,and the different types of fuel ash will react with each other when co-combustion.The alkali chlorides released in gaseous form may b...