褐煤快速热解半焦理化特性及气化活性  

Physical and chemical characteristics and gasification reactivity of lignite fast pyrolysis char

作　　者：孙强[1] 张彦威[1] 李谦[1] 王智化[1] 葛立超[1] 周志军[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2016年第11期2045-2051,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家"973"重点基础研究发展计划资助项目(2012CB214906)

摘　　要：为了研究长停留时间,大给料量条件下褐煤快速热解半焦的比表面积、孔径分布、表面官能团的变化规律及不同热解条件下半焦的CO2气化活性,在自制沉降炉上进行平庄褐煤热解温度600-1000℃快速裂解实验,并用N2吸附法、傳里叶变换红外光谱法及非等温热重分析法对半焦进行表征.结果表明,随着热解温度增加比表面积先增大后减小,当热解温度为900℃时比表面积最大,孔径分布主要集中在中孔及微孔.官能团的红外光谱吸收随热解温度升高而减少,800℃为分界点,800℃以下随着热解温度提高,光谱吸收显著减少,800℃以上减少幅度降低,随着热解温度增加,煤焦芳香度加剧.煤焦气化活性与比表面积并无严格相关性.The pyrolysis of Pingzhuang lignite was performed in a homemade drop-tube furnace under long residence time and large feed amount condition at 600-1000 ℃ to study the changes of specific surface area （SSA） ,pore size distribution, surface functional groups and gasification reactivity in CO2 atmosphere. The chars were characterized by N2 adsorption, FTIR and non-isothermal thermosgravimetric analysis. The result shows that SSA increases at first then decreases with the rise of pyrolysis temperature and reaches the maximum at 900 ℃. The pore size is mainly distributed in mesopore and micropore. The spectrum absorption of functional groups declines with the temperature increasing. 800 ℃ is the critical condition. When temperature is below 800℃ , the absorption reduces significantly as the temperature increases. While the absorption diminishes slowly when temperature is above 800℃. The aromatic degree increases with the rising of temperature. Gasification reactivity has little relevance with SSA.

关 键 词：沉降炉 快速热解 比表面积 傅里叶红外光谱 气化活性 

分 类 号：TQ54[化学工程—煤化学工程]