生物质灰结渣和腐蚀特性  

Behavior of slagging and corrosion of biomass ash

作　　者：李海英 张泽 姬爱民 赵荣煊 杨鹏[2] LI Haiying ZHANG Ze JI Aimin ZHAO Rongxuan YANG Peng(School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China Institute of Agro - environmental Protection, Ministry of Agriculture, Tianjin 300191, China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063009 [2]中国农业科学院环境保护科研监测所,天津300191

出　　处：《环境工程技术学报》2017年第1期107-113,共7页Journal of Environmental Engineering Technology

基　　金：河北省科技厅计划项目(14227309D)

摘　　要：针对目前生物质燃料燃烧过程中存在的灰结渣和受热面腐蚀问题,通过分析生物质灰的元素成分、矿物组成、理化特性及熔融特性等,探讨了灰结渣的形成过程和受热面腐蚀的机理。研究表明:生物质燃烧灰结渣的主要原因为碱金属硫酸盐及氯化物的形成降低了飞灰熔点,增加了飞灰的表面黏性,黏结在受热面表面形成结渣;此外,由于燃料中的氯化物在高温下参与氧化还原反应生成HCl和Cl2,再与金属受热面发生化学反应,形成了受热面腐蚀。通过研究燃料成分、炉膛温度、过量空气系数、受热面材质等因素对结渣和受热面腐蚀的影响,得出可以采用生物质与煤混烧、加入添加剂、水洗及金属表面防腐等防治措施避免或减少结渣和腐蚀现象发生。The problems of slagging and corrosion of heating surface caused by biomass ash formed during the combustion of biomass were concerned. Through analyzing the characteristics of biomass ash,such as the content of element and mineral,physical and chemical properties and ash fusion,the slagging formation process and the mechanism of the heating surface corrosion were discussed. It was found that biomass slagging is caused by the following reasons. Firstly,the forming of the alkali metal sulphates and chloride decreased the fusion point and increased the stickiness in the surface of the fly ash; and then the slagging was formed on the heating surface. In addition,based on the formation of the HCl and Cl2 during high temperature,the heating surface of the boiler will be corroded owing to Fe reaction with the HCl and Cl2. According to the analysis of the influence factors on slagging and corrosion including the content of the fuels,temperature in the furnace,materials of the heating surface and so on,it was proposed that some measures such as co-firing of biomass and coal,additives in biomass,biomass fuel washed with water and metal anticorrosion on heating surface,be used to prevent the problems of slagging and corrosion.

关 键 词：生物质灰 结渣 腐蚀 防治措施 

分 类 号：X705[环境科学与工程—环境工程]