摘要
为了认识催化裂化烟气轮机垢样和预测垢样形成原因,选择新鲜剂、待生剂、平衡剂、三旋细粉和催化烟机垢样代表催化裂化催化剂全生命周期,采用X射线衍射、X射线荧光、扫描电镜、同步热分析和激光粒度分析技术,得到新鲜剂、待生剂、平衡剂、三旋细粉和催化烟机垢样样品的元素组成、晶相结构、表面形貌、差热曲线和粒径分布等物性分析数据。通过对比各样品分析结果,发现催化剂全生命周期中金属元素和非金属元素的富集和脱离规律与低熔点化合物存在关联关系,得出垢样中Y型分子筛发生晶格变化的结论,预测多种低熔点化合物和烟机工艺条件是导致烟机结垢的根本原因,这些结果可以为后期机理研究奠定基础。
The whole life cycle of fluid catalytic cracking （FCC） catalyst was represented by fresh catalyst, spent catalyst, equilibrium catalyst, catalyst fins in dust hopper of third-stage cyclone separator, as well as scaling sample of flue gas turbine. The physical properties of these samples were analyzed by using various methods to understand the scaling of FCC expander, including X-ray Diffraction （XRD） for chemical composition, X-ray fluorescence （XRF） for crystal phase structure, scanning electron microscope （SEM） for micro-morphology pattern, differential thermal analysis （DTA） for thermal stability, laser particle size analyzer （LPS） for particle size distribution. The crystal phase transformation of Zeolite Y ir~ scaling sample and the correlation relationship between multiple low melting chemicals and enrichment of metal and non-metallic elements in whole life cycle of FCC catalyst were obtained from analysis data. Low melting chemicals and critical process conditions of FCC expander were predicted as potential scaling causes. The above results can provide foundation for further investigation of FCC expander scaling mechanism.
出处
《化学工程》
CAS
CSCD
北大核心
2013年第3期50-53,58,共5页
Chemical Engineering(China)
关键词
催化裂化催化剂
催化烟机
结垢
低熔点化合物
fluid catalytic cracking catalyst
FCC expander
scaling
low melt point chemical
