烟气轮机结垢机理及结垢过程浅析

ON FOULING MECHANISM AND PROCESS OF FLUE GAS EXPANDER

烟气轮机(简称烟机)结垢是当前困扰机组运行的一个难题。文章对影响催化剂细粉颗粒附着的作用力进行了分析,并对催化剂细粉的烧结机理进行了探讨,分析了细粉浓度、细粉粒径、催化剂元素组成等对烟机结垢的影响。同时,还对催化剂细粉颗粒在烟气轮机中的结垢过程进行了进一步分析,得出烟机结垢的关键条件是高浓度超细粉颗粒的存在的结论。细小粒径、元素富集、高温环境使得细粉颗粒表面存在熔融态化合物,而烟气轮机内部局部催化剂浓度高、局部低流速以及适宜的温度范围等因素为熔融态化合物在烟机内部附着、烧结直至结垢创造了条件。

Fouling of flue gas expander has been a tricky problem currently for the operation of the device.In this paper,the force acting on catalyst fine particles was analysed,and the sintering mechanism of catalyst fines was discussed.The influence of fines concentration,particle size and catalyst element composition on the fouling of flue gas expander was analysed.Meanwhile,the fouling process of catalyst particles in flue gas expander was further discussed.The conclusion is as follows:the key condition of fouling is the existence of high concentration of catalyst fine particles.Fine particle size,element enrichment and high temperature environment have made the molten compounds on the surface of fine particles,the high fines concentration and low flow rate in the local area of flue gas expander as well as the appropriate temperature range created conditions for the fusion compounds to be adhered,sintered and fouled in the flue gas expander.