摘要
以棉杆和木屑为原料制备生物质炭化成型燃料（biomass carbonized forming fuel,BCFF）.对成型燃料进行了热重分析,选择温度为550℃、700℃和850℃的灰样进行X 射线荧光光谱（X-ray fluorescence,XRF）、X 射线衍射（X-ray diffraction,XRD）分析、灰熔融实验. TG 实验表明：BCFF 燃烧过程经历吸热失水、挥发分析出及燃烧、固定碳燃烧和燃尽4 个阶段.XRF 分析表明：随灰化温度从550℃升高至815℃,K 减少了56.2%,Na 减少了26.5%,Cl 减少了75%,而Ca 增加了41.6%,且在700～815℃之间K、Na、Cl 元素损失最大.XRD 分析表明：BCFF 燃烧灰样的成分主要是石英、单钾芒硝、钙沸石、索伦石、方镁石和硫酸盐等. 温度从550℃升至700℃时,灰样中KCl 消失和出现了钙沸石;升至815℃时,索伦石消失,分解生成氧化钙、氧化硅、氧化铝等稳定的高温共融体.研究结果可为生物质锅炉燃料选择方面提供理论依据.
Biomass carbonized forming fuel（BCFF）was prepared by cotton stalk and sawdust serving as the typicalsample in carbonized briquetting,and then thermogravimetrically（TG）analyzed.The BCFF prepared by ashing at550℃,700℃ and 815℃ was studied by X-ray fluorescence（XRF）,X-ray diffractometer（XRD）analysis andmelting test.It is shown that BCFF combustion process can be divided into four stages：endothermic anddehydration,release of volatile and combustion reaction,fixed carbon combustion reaction and burn out.XRFanalysis shows that the contents of K,Na and Cl in ash are reduced by 56.2%,、26.5%, and 75%,respectively,withthe temperature rising, from 550℃ to 815℃.However,the content of Ca in ash increases by 41.6%,.K,Na and Clin ash suffer the greatest loss between 700℃ and 815℃.XRD analysis shows that the ash of BCFF combustion ismainly composed of quartz,arcanite,scolecite,suolunite,periclase and sulfate.Potassium chloride disappearswhile scolecite appears from 550℃ to 770℃.Suolunite decomposes and generates high-temperature molten materialslike calcium oxide,silicon oxide,aluminium oxide when the temperature reaches 815℃.The study provides atheoretical foundation for the utilization of BCFF by biomass boilers.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2016年第2期173-178,共6页
Journal of Combustion Science and Technology
基金
国家科技支撑计划资助项目(2012BAA04B01)
关键词
生物质炭化成型燃料
温度
灰
锅炉
biomass carbonized forming fuel,BCFF
temperature
ash
boiler
作者简介
侯宝鑫（1989-）,男,硕士,hbx15643927932@163.com.
张守玉,男,博士,教授,zhangsy-guo@163.com.
