延缓裂解炉管结焦和渗碳的涂层开发与工业考核(二)  

DEVELOPMENT AND INDUSTRIAL EXAMINATION OF A LOW COKING AND CARBURIZATION RESISTANT COATING FOR ETHYLENE PYROLYSIS FUR-NACES:PARTⅡ

作　　者：范根芳[1] 黄志荣[2] 李培宁[2] 

机构地区：[1]中国石化扬子石油化工有限公司烯烃厂,江苏南京210048 [2]华东理工大学机械与动力工程学院,上海200237

出　　处：《乙烯工业》2009年第4期18-20,共3页Ethylene Industry

摘　　要：减少裂解过程中结焦的关键是延缓催化结焦的形成,没有涂层的裂解炉管,其表面形成的氧化铬在裂解气氛中不能稳定存在,其延缓催化结焦能力很有限。开发了一种在裂解炉管内表面形成稳定的、具有抑制催化结焦和渗碳能力的涂层系统,并对其氧化性能、抑制结焦能力和抗渗碳能力进行了实验室研究。结果表明,涂层的恒温氧化动力学符合抛物线规律,氧化速率约为HK40钢的1/4;渗碳速率约为KHR45A钢渗碳速率的1/90;结焦速率约为KHR45A钢结焦速率的1/5～1/7。工业考核结果表明,涂层具有明显的延缓结焦和降低炉管外表面温度的效果,延长清焦周期21%以上,提高装置的处理能力约9%,大幅延长炉管的使用寿命,具有明显的节约原料、节约能源和增加产量的效果。The key to reducing coke buildup in ethylene pyrolysis reactors is to mitigate the formation of catalytic coke.Limited anti-coking properties are provided by the chromium oxide scale formed on the surface of uncoated ethylene reactors due to the instability of this oxide.A stable coating system was developed for the inner surface of cracking furnace tube to improve the resistance to carburization and catalytic coke formation.Its isothermal oxidation kinetics and anti-coking and carburizing capabilities were researched in laboratory.The results show that the oxidation kinetics obey the parabolic law,the oxidation rate is about one fourth of that of the HK40 alloy,the carburization rate is about one ninetieth of that of the KHR45A alloy, and the coking rate is about one fifth to one seventh of that of the KHR45A alloy.Performance data from commercial ethylene furnaces show that tubes with low coking and carburization resistant coating can remarkably mitigate the catalytic coke formation and decrease the external surface temperature of furnace tubes.The cycle of coke burning can be prolonged by over 21%,the production capacity can be increased by 9%,and the service life of furnace tubes can be significantly increased, thus saving raw materials and energy and increasing the output.

关 键 词：涂层 结焦 渗碳 裂解炉 

分 类 号：TQ221.211[化学工程—有机化工] TE966[石油与天然气工程—石油机械设备]