Coats-Redfern积分法研究生物质与煤单独热解和共热解动力学特性  

Kinetic Analysis of Biomass and Coal Mono-pyrolysis as well as Co-pyrolysis by Coats-Redfern

作　　者：孙云娟[1,2,3,4,5] 蒋剑春[1,2,3,4] 王燕杰[1,2,3,4] 应浩[1,2,3,4,5] 戴伟娣[1,2,3,4,5] 许乐[1,2,3,4] 

机构地区：[1]中国林业科学研究院林产化学工业研究所 [2]生物质化学利用国家工程实验室 [3]国家林业局林产化学工程重点开放性实验室 [4]江苏省生物质能源与材料重点实验室,江苏南京210042 [5]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《林产化学与工业》2014年第5期8-14,共7页Chemistry and Industry of Forest Products

基　　金：中国林科院林业新技术所基本科研业务费专项资金(CAFINT2014K04);'十二五'国家科技支撑计划资助项目(2012BAA09B03);引进国际先进林业科学技术项目(2014-4-32)

摘　　要：采用Coats-Redfern积分法对生物质与煤单独热解和共热解过程进行动力学特性分析,考察了升温速率与反应级数在生物质与煤单独热解和共热解过程中对活化能的影响。结果表明,原料失重率在5%~80%的温度区间内,反应级数越高,反应温度越低,升温速率对热解积分曲线的影响越大,且随着升温速率的增加,热解积分曲线逐渐向高温区平移;在相同的温度段内选择不同的反应级数时,生物质热解积分曲线都可以呈现较好的线性关系,尤其是稻壳,选用的反应级数对拟合的结果影响不大;煤单独热解及煤与生物质共热解过程中,反应级数对拟合的结果影响比较明显,在较高反应级数时数据拟合程度都比较高,在较低反应级数时,拟合结果偏离直线形式,而且随着煤化程度的增加,拟合结果偏离直线形式越严重;生物质与煤共热解的拟合程度介于生物质与煤单独热解之间。通过分析动力学参数,发现生物质与煤在较低温度下协同反应效应较为明显,促进了共热解反应的进程。In this paper,Coats-Redfern was used to analyze the dynamic characteristics of biomass with coal mono-pyrolysis and co-pyrolysis. It mainly researched the influence of heating rate and reaction order on pyrolysis integral curve. It found that in the temperature zone which weight lost rate of raw materials was 5 %- 80 %,the higher reaction order and lower reaction temperature,the more influence of heating rate on the pyrolysis integral curve. With the heating rate increasing,the pyrolysis integral curve gradually moved to the high temperature zone. When the different reaction order in the same temperature range was chosen,biomass pyrolysis integral curves all showed well linear relation,especially the rice husk. But reaction orders had clearly influence on the results of the coal mono-pyrolysis and biomass co-pyrolysis with coal. At high reaction orders,it had the well fitting curve,but at the low ones,fitting curves drifted off the linear forms. With the coal rank increasing,the fitting curve obviously drifted off the linear forms. The fitting degree of biomass co-pyrolysis with coal was between the biomass mono-pyrolysis and coal mono-pyrolysis. In the lower temperature range,there was synergistic effect on co-pyrolysis of biomass and coal.

关 键 词：生物质 煤 Coats-Redfern积分法 共热解 协同反应 

分 类 号：TQ35[化学工程]