烘焙预处理对小球藻热解特性与产物分布的影响  

Effect of torrification on the pyrolysis characteristics and products distribution of Chlorella vulgaris

作　　者：谢东明 钟典 李俊 曾阔[2] 彭静 Xie Dongming;Zhong Dian;Li Jun;Zeng Kuo;Peng Jing(Guangxi Special Equipment Inspection and Research Institute,Nanning 530200,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China;China-EU Institute for Clean and Renewable Energy,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]广西壮族自治区特种设备检验研究院,广西南宁530200 [2]华中科技大学能源与动力工程学院,煤燃烧国家重点实验室,湖北武汉430074 [3]华中科技大学中欧清洁与可再生能源学院,湖北武汉430074

出　　处：《可再生能源》2022年第8期1006-1014,共9页Renewable Energy Resources

基　　金：国家重点研发计划项目(2017YFE0124200)。

摘　　要：文章通过在不同升温速率下进行烘焙小球藻的热重实验,探究其在40-900℃下的热重反应特性,采用分布式活化能模型(DAEM)计算烘焙后热解活化能,揭示烘焙对其热解动力学的影响。采用热重红外联用仪分析烘焙小球藻的热解气体变化规律,采用Py-GCMS探究在不同热解温度(500℃和900℃)下烘焙小球藻热解生物油的变化规律。结果表明:烘焙预处理增加了小球藻的热解活化能,同时促进了小球藻在热解过程中含氮产物的生成;烘焙后小球藻在900℃下发生热解时,以生成轻质芳烃和烯烃类产物为主,几乎不产生含氧化合物,且烘焙预处理更容易使生物油发生裂解,最佳烘焙温度为250℃。As a third generation biomass,algae have been widely used as biomass pyrolysis feedstock in recent years due to their fast growth rate,high photosynthetic efficiency,lack of arable land occupation and high oil yield.However,the higher nitrogen content in its products raises new challenges for its utilization.In order to investigate the influence of different torrifying conditions on the pyrolysis characteristics,especially on the nitrogen-containing products,the thermogravimetric reaction characteristics of the baked materials were investigated at 40~900℃ by thermogravimetric experiments at different heating rates,and the activation energy of Chlorella vulgaris after torrifying was calculated by distributed activation energy model(DAEM)to investigate the influence of torrifying on its pyrolysis kinetics.TG-FTIR coupling was used to analyze the pyrolysis gas change of baked biomass at a temperature increase rate of 10℃/min,and Py-GC/MS was used to investigate the change of baking on the pyrolysis bio-oil of Chlorella vulgaris at different pyrolysis temperatures(500℃ and 900℃).The results showed that torrifying pretreatment increased the activation energy of Chlorella vulgaris pyrolysis,and also increased the generation of NOX precursors in the process of pyrolysis;when the pyrolysis of Chlorella vulgaris occurred at 900℃ after torrifying,light aromatic and olefin products were mainly generated,and almost no oxygenated compounds were produced,and the torrifying pretreatment was more likely to crack the bio-oil,and the optimal torrifying temperature was 250℃.

关 键 词：富氮生物质 烘焙 热解 活化能 

分 类 号：TK6[动力工程及工程热物理—生物能] S216[农业科学—农业机械化工程]