煤炭转化2018，Vol.41Issue(2)：1-8,8.
高碱煤燃烧过程中结渣机理研究进展
Research Progress on Slagging Mechanism During High Alkali Coal Combustion Process
摘要
Abstract
A review of the previous research on the mechanism for slagging during the high alkali coal combustion was presented.The occurrence modes of the sodium contained in the high alkali coal and the conversion rule of the sodium during the high alkali coal combustion was summarized as follows:during coal combustion process,alkali metals are released and transported either in the form of solid particles or vapor species in the combustion gas.The main occurrence modes of alkali metals in solid particles is,A-silicates and A-aluminosilicates (A represents K and Na),and the main occurrence modes of alkali vapor species is A(g),ACl(g),A2CO3 (g),A2SO4 (g),and AOH(g).The slagging mechanism caused during the high alkali coal combustion process can be illustrated as follows:the vaporized Na2SO4 and CaSO4 at high temperature will condense on heating surface and form an initial sticky slagging layer as an adhesive that bonds the subsequent deposits and heating surfaces together and the condensed Na2SO4 and CaSO4 react with the subsequent deposits from low melting point chemical compounds to promote growth of slagging.Furthermore,coating particles due to the condensation of the vaporized Na2SO4 and CaSO4 at high temperature on grain boundary and iron-bearing minerals promote growth of slagging.The mode of boiler slagging prediction and the current control technologies for the high sodium coal slagging were briefly introduced and some potentially promising research topics on the slagging mechanism of the high alkali coal were discussed.关键词
高碱煤/碱金属/赋存形式/燃烧/结渣Key words
high alkali coal/alkali metal/occurrence mode/combustion/slagging分类
化学化工引用本文复制引用
江锋浩,张守玉,黄小河,李昊,王才威,张一帆,吕俊复..高碱煤燃烧过程中结渣机理研究进展[J].煤炭转化,2018,41(2):1-8,8.基金项目
国家重点研发计划项目(2016YFB0600203)和上海理工大学科技发展项目(16KJFZ094). （2016YFB0600203）
