玉米秸秆成型颗粒高温热解和燃烧特性研究  

Study on High-Temperature Pyrolysis and Combustion Characteristics of Corn Straw Briquettes

作　　者：魏博 陈丽娟[1] 阿依谢姆古丽·赛来 李显 王建江[1] 刘江山 WEI Bo;CHEN Lijuan;Ayixiemuguli Sailai;LI Xian;WANG Jianjiang;LIU Jiangshan(Key Laboratory of Coal Clean Conversion&Chemical Engineering Process of Xinjiang Uyghur Autonomous Region,School of Chemistry and Chemical Engineering,Xinjiang University,Urumqi Xinjiang 830046,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan Hubei 430074,China)

机构地区：[1]新疆大学化学化工学院,新疆煤炭清洁转化与化工过程重点实验室,新疆乌鲁木齐830046 [2]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《新疆大学学报（自然科学版）（中英文）》2021年第6期685-690,共6页Journal of Xinjiang University(Natural Science Edition in Chinese and English)

基　　金：新疆大学博士启动基金(2018).

摘　　要：为分析玉米秸秆成型颗粒燃烧过程中挥发分析出阶段的作用及反应温度对成型颗粒燃烧特性的影响,本文针对成型颗粒设计了等温反应试验系统,在700»1000℃范围内开展成型颗粒高温热解和燃烧实验,分析不同条件下的失重速率与挥发分析出完成时间.结果表明:成型颗粒的高温热解和燃烧均可分为两个阶段,热解过程第一阶段的挥发分析出致使成型颗粒失重达到70%左右,剩余焦炭在第二阶段继续加热过程中失重量很小;燃烧过程第一阶段除挥发分析出外,表层焦炭也在燃烧,且产生的高温可加速成型颗粒内部挥发分的析出,第二阶段为焦炭燃烧.从700℃升高至1000℃时,高温热解和燃烧的第一阶段时间分别缩短了47.6%和44.4%,而燃烧过程中焦炭的燃烧速率提高了约3倍.To analyse the role of volatile devolatilization process in the briquettes overall combustion process was studied by contrasting the difference in high-temperature pyrolysis process and combustion process at different temperatures,the isothermal reacting experimental system was built.The high-temperature pyrolysis and combus-tion experiments were carried out in the range of 700»1000℃to study the weight loss velocity and devolatilization process time.The results indicated that whether high-temperature pyrolysis or the combustion process of corn straw briquettes could be divided into two stages.The first stage in high-temperature pyrolysis mainly was de-volatilization process,and the weight loss reached 70%in whole briquettes.In contrast,the char was heated in the second stage,and the weight loss was very small.Aimed to combustion process,except for volatile devolatilization,a certain amount of char at the outside surface of briquette was also burned during the first stage.In addition,the outside surface char combustion provided heat to enhance the temperature inner of briquettes increasing,and accelerated the devolatilization process.As the reacting temperature increased from 700℃to 1000℃,the react-ing times of the first stage in high-temperature pyrolysis and combustion process shortened about 47.6%and 44.4%,the combustion velocity of briquettes char combustion process was increased by about 3 times.

关 键 词：生物质 成型颗粒 燃烧 高温热解 等温反应 

分 类 号：TK6[动力工程及工程热物理—生物能]