摘要
在管式炉固定床上进行生物质高温热解试验,分析研究挥发分高温区停留时间、热解温度和水洗处理对碳烟生成及其理化特性的影响.结果表明:生物质碳烟由挥发分二次转化生成,在停留时间极短时(约0.2 s),生物质在900～1 200℃热解观察不到碳烟生成;延长停留时间至约2 s,生物质在≥1 000℃下热解生成大量碳烟,碳烟产率随热解温度升高而提高,且水洗麦秆碳烟产率略高于原样麦秆.在1 000℃下,生物质碳烟主要由无定形碳烟组成,热解温度升高至≥1 100℃时,可以观察到洋葱状石墨片层结构碳烟,且随着热解温度升高,洋葱状石墨片层结构更加清晰.热解温度升高,碳烟的石墨化程度提高,氧化活性降低;原样麦秆碳烟中含有丰富的KCl,其氧化特性显著优于水洗麦秆碳烟.
Biomass pyrolysis was carried out in a fixed-bed tubular reactor system to investigate the effects of volatile residence time,temperature,and water-leaching on the formation of soot and its physicochemical properties.Results show that soot formation during biomass pyrolysis was dominated by the secondary reactions of volatiles at high temperatures.At a short volatile residence time of^0.2 s,no soot was formed at 900—1200℃;when the volatile residence time increased to^2 s,however,soot was formed at≥1000℃.Soot yield increased with the pyrolysis temperature and water-leaching into the biomass.Soot particles were in irregular shape at a low temperature of 1000℃.The regular onion-like and layered structure of soot was observed when the pyrolysis temperature was≥1 100℃.With further increases in temperature,the onion-like and layered structures became much clearer.The soot formed at higher temperatures had a higher degree of graphitization,resulting in lower oxidation activity.An abundance of KCl was found in raw straw soot,which had higher oxidation activity than water-leached straw soot.
作者
李帅帅
王学斌
白胜杰
靳启明
李玉坤
李艳
谭厚章
Li Shuaishuai;Wang Xuebin;Bai Shengjie;Jin Qiming;Li Yukun;Li Yan;Tan Houzhang(Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2019年第2期131-138,共8页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(51676157)
国家自然科学基金国际合作项目(51761125012)
关键词
生物质
水洗
热解
碳烟
biomass
water-leaching
pyrolysis
soot
