![]() ![]() ![]() In a modern refinery this is generally achieved by passing the flue gas through four seperate stages of cyclonic separation: the first two of which are typically located within the regenerator vessel itself, the third which is located prior to the turbo-expander and the fourth which collects catalyst solids from the third stage underflow.Īs a stand-alone item, the fourth stage separator must be designed as a pressure vessel, but until recently it was common practice to utilise internal refractory lining to reduce the metal temperatures arising in the pressure envelope, thereby simplifying the design task for this item. With the application of ever more stringent environmental legislation governing oil refinery emissions, the efficient separation of catalyst fines from fluid catalytic cracking unit (FCCU) flue gas streams is becoming more important than ever before. ![]()
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