非线性等转化率法木质炭和烟煤共气化动力学  

KINETIC ANALYSIS OF CO-GASIFICATION OF WOODY BIOCHAR AND BITUMINITE BY INTEGRAL ISOCONVERSIONAL NON-LINEAR METHOD

作　　者：邱家用[1,2] 居殿春 殷天颖[3] 徐敏人 白妮 焦丽娜[1,2] Qiu Jiayong;Ju Dianchun;Yin Tianying;Xu Minren;Bai Ni;Jiao Lina(School of Metallurgical and Materials Engineering,Jiangsu University of Science and Technology,Zhangfiagang215600,China;Institute of Fine Metallurgy Research,Industrial Technology Research Institute of Zhangjiagang&Jiangsu University of Science and Technology,Zhangjiag ang215600,China;School of Metalurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing100083,China)

机构地区：[1]江苏科技大学冶金与材料工程学院,张家港215600 [2]张家港江苏科技大学产业技术研究院精细冶金研究所,张家港215600 [3]北京科技大学冶金与生态工程学院,北京100083

出　　处：《太阳能学报》2018年第11期3155-3162,共8页Acta Energiae Solaris Sinica

基　　金：江苏省自然科学基金面上项目(BK20161271);江苏科技大学博士科研启动基金(120140004;120140008)

摘　　要：为研究木质生物炭和烟煤CO2共气化反应动力学规律,将木质炭和神华烟煤以不同比例进行掺混,采用非等温热重分析法对木质炭、烟煤及混合试样进行热重分析,并采用非线性等转化率积分法和Flynn-Wall-Ozawa法(简称FWO法)对木质炭和烟煤共气化过程进行动力学分析。研究结果表明:木质炭呈多孔蜂窝状结构,气隙发达且排列有序,而烟煤为光滑致密的少孔或无孔结构,添加木质炭可改善烟煤的微观结构。在木质炭与烟煤共气化过程中,由于烟煤的存在,其转化率曲线在700—1100K区间发生弯曲上扬,故以约973K(700℃)为分界点,将木质炭与烟煤共气化过程分为低温的热解段和高温的碳气化段。随着木质炭添加量的增加,热解段反应速率下降,而碳气化段反应速率明显增加,使整个气化过程反应速率增大,气化时间缩短。用非线性等转化率积分法和FWO法计算得到木质炭气化的平均表观活化能值为123.383kJ/mol和133.857kJ/mol,烟煤气化平均表观活化能值为265.890kJ/mol和269.902kJ/mol。随烟煤添加量的增加,气化反应的表观活化能平均值呈明显增加趋势。In order to investigate the kinetics of co-gasification of woody biochar(WB)and bituminite with CO2,the WB and Shenhua bituminite(SHB)were blended in different ratios and were analyzed by non-isothermal thermogravimetric analysis method.The integral isoconversional non-linear(NL-INT)method and Flynn-Wall-Ozawa method have been used for dynamics analysis during gasification process.The results showed that the WB has porous honeycomb structure and its developed poresi are arranged in an orderly manner,whereas the SHB is smooth and dense. Therefore,adding WB can improve the microstructure of bituminite.Due to the effect of bituminite,the conversion curve bent to rise within the temperature range of700-1100K during the co-gasification of WB and bituminite.About973K (700℃)as a dividing point,the gasification process of WB with bituminite is divided into the low temperature pyrolysis phase and the high temperature carbon gasification phase.With increasing the dosage of WB,the pyrolysis reaction rate decreases and the carbon gasification reaction rate increases significantly.Therefore,it makes the total gasification reaction rate increase and makes the gasification time reduce.Using the NL-INT and FWO methods,the average values of apparent activation energy for WB gasification are123.383kJ/mol and133.857kJ/mol,and those for bituminite gasification are265.890kJ/mol and269.902kJ/mol.With the increase of bituminous coal,the average values of apparent activation energy of gasification reaction increase significantly.

关 键 词：生物质能 煤粉 共气化 非线性等转化率法 表观活化能 

分 类 号：TK6[动力工程及工程热物理—生物能]