晋城煤粒度变化对灰熔融性影响规律研究  

Study on the influence of particle size on the ash melting behavior of Jincheng coal

作　　者：张渤[1] 张洪[2] 杨云飞 胡光洲[2] 张鹏启 伦飞 ZHANG Bo;ZHANG Hong;YANG Yun-fei;HU Guang-zhou;ZHANG Peng-qi;LUN Fei(Qinhuangdao Entry-Exit Inspection and Inspection Bureau Coal Detection Technology Center,Qinhuangdao 066003,China;;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]秦皇岛出入境检验检疫局煤炭检测技术中心,河北秦皇岛066003 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《燃料化学学报》2018年第12期1430-1436,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金--山西煤基低碳联合基金(U1510106)资助~~

摘　　要：探索山西晋城煤在灰熔聚流化床气化过程中的结渣机理。采用山西晋城无烟煤,将其破碎到不同粒径,采用XRF、XRD、AFT、SEM和FactSage^(TM)研究了煤的灰分、煤灰化学组成、矿物组成和熔融性随煤样粒径变化规律。结果发现,对于破碎到6 mm以下的晋城煤样,不同粒径子样煤灰化学组成和熔融温度差异不大;对于粉磨到0.2 mm以下的晋城煤粉样品,不同粒径子样化学组成和矿物组成存在较大差异,其中,铁含量差异最明显。AFT和SEM结果都证明,<45μm粒径煤粉子样煤灰熔融温度明显高于其他三种样品。Fact SageTM计算得到的液相量变化规律和AFT、SEM观察结果一致,说明煤灰熔融性随粒径变化是煤灰化学成分离析造成的,而SiO2-Al_2O_3-Fe_2O_3三元相图较好地解释了晋城煤煤灰熔融性随粒径变化机理。The slagging mechanism of the Jincheng coal in the ash-agglomerate fluidized bed gasification was explored.A typical Jincheng coal sampled from Shanxi,China was prepared into different particle size and the XRF,XRD,AFT,SEM and FactSage TM were employed to study the influence of particle size on the ash content,chemical and mineral composition and ash fusibility.The results indicate that the ash chemical composition and AFTs vary little with size below 6 mm.For the pulverized samples below 0.2 mm,there are apparent differences in the chemical composition and mineral composition,especially in Fe 2O 3.Both AFT results and SEM observations show that the sample with particle size less than 45μm has a significantly higher melting temperature than the other three samples.The slag contents calculated with FactSage TM are consistent with the AFT results and SEM observations,which indicates that the change of ash melting behavior with particle size results from the change in chemical composition.The ternary phase diagram of SiO 2-Al 2O 3-Fe 2O 3 can be used successfully to explain the mechanism of the change of ash melting behavior with particle size for Jincheng coal.

关 键 词：晋城煤 灰熔聚流化床 灰熔融温度 结渣 

分 类 号：TQ533[化学工程—煤化学工程]