摘要
通过工业分析、元素分析和傅里叶红外光谱测试基于循环流化床的新疆准东煤(ZDC)气化灰渣(FA:飞灰;BA:底渣),获得灰渣的基本性质和官能团种类。结果显示,BA的灰分含量高达99.30%,而FA的固定碳和碳元素含量较高,分别为69.30%和73.78%。进一步采用Raman、XRPES和SEM表征ZDC和FA的碳质形式和表面形貌,利用TG-DTG技术考察ZDC和FA的热解、燃烧和气化反应特性。XRPES结果显示,FA表面C元素含量为89.42%,主要以>C-C<和>C-H的形式存在,而O元素主要以>C=O的形式存在。碱土金属Ca与上述涉碳官能团结合,导致FA无序程度较高。SEM观察到熔融矿物质球形颗粒附着和镶嵌在FA表面和孔道中,导致表面粗糙多孔。热转化特性显示,FA的热解和燃烧最大失重速率峰温度均较ZDC明显升高,表明FA的热解和燃烧性能降低。然而,FA的100%碳转化率所用气化时间仅为ZDC的一半,气化性能显著提高,原因在于FA具有发达的孔道结构、较多的无定形碳及丰富的活性位点,强化了气化剂CO_(2)的扩散过程。因此,FA可直接回收用作循环流化床的气化原料。
Based on the circulating fluidized bed(CFB),Xinjiang Zhundong coal(ZDC) gasification ash(FA:fly ash;BA:bottom slag) was analyzed by industrial analysis,ultimate analysis and Fourier infrared spectroscopy to determine the basic properties and functional group species.The results show that BA contains up to 99.30% in ash,while FA shows high fixed carbon and C content of 69.30% and 73.78% respectively.Furthermore,the carbonaceous forms and surface morphology of ZDC and FA were characterized by Raman,XRPES and SEM,and the pyrolysis,combustion and gasification characteristics of ZDC and FA were studied with TG-DTG methods.XRPES show that C content of the FA surface is 89.42%,and exists primarily as >C–CC–H,while O was in the form of >C=O.Alkaline earth metals Ca bound to the above-mentioned carbon-involved functional groups cause high disorder in FA.SEM observed that the rough and porous FA surface occurs due to spherical particles of molten mineral attached and embedded surface and pore channels.The thermal conversion characteristics show that the maximum weight loss rate peak temperature of pyrolysis and combustion of FA is significantly higher than that of ZDC,indicating that the pyrolysis and combustion performance of FA is reduced.However,100% carbon conversion of FA uses about half the time compared with ZDC and the gasification performance has improved significantly since it has well-developed pore structures,more amorphous carbon and abundant active sites,enhancing diffusion of CO_(2) from gasifiers.Briefly,FA has the potential and ability to be recycled for direct utilization in CFB as gasification feed.
作者
胡小波
杨晓勤
莫文龙
张书培
高吉
魏贤勇
樊星
HU Xiao-bo;YANG Xiao-qin;MO Wen-long;ZHANG Shu-pei;GAO Ji;WEI Xian-yong;FAN Xing(State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources and Key Laboratory of Coal Clean Conversion&Chemical Engineering Process(Xinjiang Uyghur Autonomous Region),School of Chemical Engineering and Technology,Xinjiang University,Urumqi 830046,China;Xinjiang Yihua Chemical Industry Co.,Ltd.,Changji 831700,China;Key Laboratory of Coal Processing and Efficient Utilization,Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China;College of Chemical and Biological Engineering,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2022年第10期1361-1370,共10页
Journal of Fuel Chemistry and Technology
基金
昌吉州科技支撑产业高质量发展专项课题(2022Z04)“煤炭煤化工提质增效关键技术研发与应用”
碳基能源资源化学与利用国家重点实验室专项课题“基于准东煤的流化床气化炉元素迁移转化机制及反应器模拟与优化”
新疆宜化循环流化床煤气化工艺固废综合利用研究与开发
新疆宜化高碱低灰熔点煤循环流化床气化工艺优化与示范项目资助。
关键词
煤气化
准东煤
灰渣
组成结构
热转化
coal gasification
zhundong coal
ash and slag
composition structure
thermal conversion
