摘要
针对气基磁化焙烧还原铁尾矿成本昂贵的问题,基于生物质廉价易得且具有较好的还原性气体制备潜力的特点进行产气机理探究。通过热解实验研究了温度、含水率、Na_(2)CO_(3)催化剂添加量对杉树木屑与竹屑热解制备还原性气体的影响,利用TG-IR探究二者的产气特征,并结合动力学分析确定杉树木屑与竹屑的热解机理函数与活化能。结果表明,生物质在较低含水率(40%以下)的条件下提高热解温度,有利于还原气的制备;当热解温度为700℃、Na_(2)CO_(3)添加量为4%时,烘干的杉树木屑热解气中还原性气体占比约为76%,竹屑则约为66%;二者的还原性气体均集中产生于热解第二阶段,其热解过程符合反应级数模型;经计算,杉树木屑的活化能为118.32~135.43 kJ·mol^(−1),竹屑的活化能为112.39~118.75 kJ·mol^(-1)。本研究结果可为生物质热解制备还原性气体提供技术指导。
Due to the high cost for reducing iron tailings by gas-based magnetization roasting,this paper explored the mechanism of gas production,which was based on the cheap,easily obtaining,and good potential for reducing gas production characteristics of biomass.Through single-factor experiments,the effects of temperature,water content,and Na_(2)CO_(3)catalyst addition on the fir sawdust and bamboo sawdust were explored.Besides,the gas production characteristics between these two sawdust were investigated by TG-IR.By kinetic analysis,the pyrolysis mechanism function and activation energy of fir sawdust and bamboo sawdust were determined.The results indicated that the moisture content below 40%was conducive to reduce gas production.When the pyrolysis temperature was 700℃and the addition amount of Na_(2)CO_(3)was 4%,the proportion of reducing gas in the pyrolysis gas of dried fir sawdust was about 76%,and that of bamboo sawdust was about 66%.Both of the reducing gases are concentrated in the second stage of pyrolysis,which can be better described by the reaction series model.By calculated,the activation energy of Chinese fir sawdust was 118.32~135.43 kJ·mol^(-1);while the activation energy of bamboo sawdust was 112.39~118.75 kJ·mol^(-1).The results can provide technical guidance for the preparation of reductive gases by biomass pyrolysis.
作者
谢鸿智
宁寻安
邱国强
邓金环
XIE Hongzhi;NING Xun-an;QIU Guoqiang;DENG Jinhuan(School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China;Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control,Institute of Environmental Health and Pollution control,Guangzhou 510006,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2022年第5期1639-1648,共10页
Chinese Journal of Environmental Engineering
基金
2017年土壤中央专项资金资助项目(No.18HK0108)。
关键词
杉树木屑
竹屑
热解
还原性气体
动力学
fir sawdust
bamboo sawdust
pyrolysis
reducing gas
kinetics
作者简介
第一作者:谢鸿智(1996-),男,硕士研究生,707656439@qq.com;通信作者:宁寻安(1967-),男,博士,教授,ningxunan666@126.com。
