摘要
利用自制的高温炭化试验装置在不同最终炭化温度下制备稻秆和稻壳焦炭,研究了稻秆和稻壳焦炭电阻率的变化规律,分析稻秆和稻壳焦炭微观形态、化学成分、官能团分布等与电阻率之间的依变关系.当最终炭化温度从400.℃升高到1.400.℃时,稻秆和稻壳焦炭的电阻率分别从∞减小到0.40.Ω.cm和从∞减小到1.49.Ω.cm.在900.℃以上时,焦炭微观结构与温度关系不大,而随秸秆种类不同而差异较大;稻秆焦炭外表面为层叠的不规则薄片;稻壳焦炭外表面为规律排列的瘤状凸起结构,这使得其在一定压力下难以紧密压实,增大了体积电阻率.对焦炭中的特征官能团分析表明,随着温度的升高,焦炭中C=C峰值增加,而C—O键、O—H键的特征峰值减小,另外,当最终炭化温度从900.℃升高到1.400.℃时,稻壳焦炭中的C/O原子数比从21升高到695,两者相互呼应.
In order to search a more effective way to produce charcoal of low electrical resistivity from agricultural wastes in China, rice straw and rice hull were carbonized, and the electrical resistivities of charcoal were analyzed, as well as the micro structure, components and function groups. The results implied that when the final temperature rose from 400 ℃ to 1 400 ℃, electric resistances of rice straw and hull charcoal decrease from ∞ to 0.40 Ω · cm and from oo to 1.49 Ω · cm respectively. The charcoal of rice straw was composed of irregular slices and could be compacted tightly. Rice hull charcoal was full of strumae, which was hard to compact, and probably it was the main reason for the higher electrical resistivity. As temperature increasing, the peak of C=C rose up, while the peaks of C-O and O-H went down.When temperature increases from 900 ℃ to 1 400 ℃, the ratio of C/O of rice hull charcoal increased from 21 to 695, which was in agreement with the results of function group analysis.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2010年第1期1-4,共4页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(50806013)
国家重点基础研究发展计划(973)资助项目(2010CB732206)
教育部博士点新教师基金资助项目(20070286074)
东南大学科技基金资助项目(XJ2008306)
关键词
稻类秸秆
电阻率
焦炭特性
rice straw and hull
electrical resistivity
characteristics of charcoal
