基于准东煤的Texaco气化炉灰渣组成结构特征与热转化性能  

Ash composition,structural characteristics and thermal conversion performance of Texaco gasifier based on Zhundong coal

作　　者：徐小伟 莫文龙[1] 郝呈祥 刘一波 魏贤勇 杨晓勤[4] 张书培 XU Xiao-wei;MO Wen-long;HAO Cheng-xiang;LIU Yi-bo;WEI Xian-yong;YANG Xiao-qin;ZHANG Shu-pei(Key Laboratory of Coal Clean Conversion&Chemical Engineering Process(Xinjiang Uyghur Autonomous Region),College of Chemical Engineer,Xinjiang University,Urumqi 830046,China;Guoneng Xinjiang Chemical Industry Co,Ltd,Urumqi 831400,China;Key Laboratory of Coal Processing and Efficient Utilization,Ministry of Education,China University of Mining&Technology,Xuzhou 221116,China;Xinjiang Yihua Chemical Industry Co,Ltd,Changji 831700,China)

机构地区：[1]新疆大学化工学院省部共建碳基能源资源化学与利用国家重点实验室,煤炭清洁转化与化工过程新疆维吾尔自治区重点实验室,新疆乌鲁木齐830046 [2]国能新疆化工有限公司,新疆乌鲁木齐831400 [3]中国矿业大学煤炭加工与高效洁净利用教育部重点实验室,江苏徐州221116 [4]新疆宜化化工有限公司,新疆昌吉831700

出　　处：《燃料化学学报》2022年第7期777-786,共10页Journal of Fuel Chemistry and Technology

基　　金：新疆维吾尔自治区引进高层次人才天池计划;煤炭加工与高效洁净利用教育部重点实验室开放基金;新疆维吾尔自治区重点实验室开放课题(2018D04008)资助。

摘　　要：解析以准东煤为原料的Texaco气化炉所排细渣和粗渣的组成结构特征,分析两者的热化学转化性能。结果表明,粗渣固定碳含量为42.31%,说明粗渣可以作为碳基原料实现高附加值利用。FT-IR分析显示,粗渣和细渣中Si−O的吸收峰更强,且细渣中含有少量的芳香结构。惰性气氛热分解行为发现,粗渣在600℃的失重速率最大,而细渣其最大失重速率峰转移到了620℃左右。氧化性气氛热分解结果表明,在500−700℃条件下,粗渣和细渣均有明显失重,且两者的失重主要源于固定碳的燃烧。采用Coats-Redfern法对惰性气氛和氧化性气氛下粗渣和细渣的失重曲线进行拟合,计算热解/燃烧活化能、相关系数等动力学参数。结果表明,在惰性气氛下,粗渣热解激烈段(560−640℃)反应级数设定为3时拟合效果较好,相关系数R^(2)为0.99,活化能E为38.85 kJ/mol。细渣热解激烈段(590−650℃)同样在反应级数设定为3时拟合效果较好,相关系数R^(2)为0.97,活化能E为79.09 kJ/mol。在氧化性气氛下,粗渣和细渣燃烧激烈段分别在540−605℃和530−605℃,反应级数均以n=1时拟合效果较好,活化能E分别为226.46和154.73 kJ/mol。Composition and structure characteristics of fine slag(FS) and coarse slag(CS) discharged from Texaco gasifier with Zhundong coal as raw material were analyzed, and their thermochemical conversion properties were analyzed. Proximate and ultimate analyses show that the contents of fixed carbon in coarse slag are 42.31%,indicating that it can be used as raw material to realize its high-added utilization. Analysis with Fourier transform infare spectrometer(FT-IR) suggest that the absorption peak of Si-O in coarse slag and fine slag is stronger, and there is a small amount of aromatic structure in fine slag. Thermal decomposition behaviors in inert atmosphere show that the maximum weight loss rate peak of coarse slag is located around 600 ℃, while that of fine slag is transferred to about 620 ℃. Results of thermal decomposition in oxidization atmosphere show that there are obvious weight loss rate peaks derived from combustion of the fixed carbon in 500-700 ℃. The weight loss profiles of fine slag and coarse slag in inert and oxidization atmosphere were fitted by Coats-Redfern method. The kinetic parameters including pyrolysis/combustion activation energy and correlation coefficient were calculated. The results show that the fitting effect is better as the reaction order selected as 3 at the intense pyrolysis section(560-640 ℃)for coarse slag in inert atmosphere, with correlation coefficient R^(2) of 0.99 and activation energy E of 38.85 k J/mol.Similarly, in the intense pyrolysis stage(590-650 ℃) of fine slag, the fitting effect is better as the reaction order selected 3, with the correlation coefficient R^(2) of 0.97 and the activation energy E of 79.09 k J/mol. In oxidization atmosphere, at the intense combustion stage of coarse slag(540-605 ℃) and fine slag(530-605 ℃), the fitting effect is better as n=1 for the both slags, with the activation energy E of 226.46 and 154.73 k J/mol respectively.

关 键 词：煤气化 气化渣 FT-IR 热重分析法 Coats-Redfern模型 

分 类 号：TQ531[化学工程—煤化学工程]