Identification of aerosol production in fccu cyclones

摘要

Fluidized Catalytic Cracker Units (FCCU) are used to produce gasoline products by cracking long chain hydrocarbons in shorter length molecules (Kunii and Levenspiel 1991).The longer chained hydrocarbons are vaporised and mixed with a zeolite based catalyst,which under high temperatures and low pressures,cracks the hydrocarbon into smaller chains.The unit normally comprises three sections,the rising main,the reactor and the regenerator.The catalyst and hydrocarbons are injected into the rising main where the reaction occurs,the catalyst is then separated from the product at the entrances to the reactor.Catalyst is recycled back to the regenerator while gasoline products are removed via the top of the reactor.The regenerator is a large fluidized bed used to 're-charge' the catalyst by burning the coke deposits on its surface.Once 're-charged',the catalyst is recycled back into the rising main,and the process is continued.