Abstract：Based on concentration, particle size and morphology analysis of catalyst samples from fluid catalytic cracking (FCC) unit of oil refinery, FCC flue gas turbine scale sample elemental composition analysis and high-temperature static sintering laboratory experiments,causes and influencing factors of catalyst scaling in gas turbine operating conditions were researched. The results show that the size of particles entered into the flue gas turbine is mainly less than 10 μm,and the shape of these particles is irregular which leads to easily deposited and adhered to the surface of flow passage component. Comparing with the FCC fresh catalyst, there are four kinds of metal elements which are Na, Ca, Fe, and Ni in the catalyst that entered into the flue gas turbine, and their contents significantly increase. The static sintering experiment in the high-temperature sintering furnace further validates the promoting effect of the four kinds of metal elements on catalyst scaling.

Keywords: scaling；catalyst; fluid catalytic cracking flue gas turbine