Research On Scaling Of Flue Gas Expander Used For Fluid Catalytic Cracking Unit

The flue gas expander is an important equipment of catalytic cracking energy recovery system, its safe and stable operation not only has a higher economic efficiency, but also related to the regenerator’s or the whole of catalytic cracking unit’s running smoothly. Therefore, ensuring the normal operation of the flue gas expander has an important significance. The scaling of gas expander would directly lead to the gas expander vibration value increasing and results in the decrease of the output efficiency. Therefor, seeking to explore the law of scaling and the controling method is imminent.Through the laboratory experiment(including spraying experiment, the sintering experiment, etc.), which reference to industrial operation process parameters, we try to explore the scaling with laboratory simulation in this paper. The result shows that: scaling need a long period of time; the formed scaling sample(main body) is relatively hard and solid under the normal operation of the working conditions; adding some extra easy fouling elements(such as Ca, Na, S, etc.) to catalyst powder would greatly increase its scaling tendency; and higher temperature, higher collision speed, the right of the blade angle and particle size of catalyst powder would dramatically increase the scaling tendency; On the other hand, taking proper control of these factors would slow or restrain the scaling tendency. To further analyzing the scaling law, this article has designed a scheme of industrial pilot experiment.