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High Density Gas-Solids Circulating Fluidized Bed Riser And Downer Reactors, Chengxiu Wang
High Density Gas-Solids Circulating Fluidized Bed Riser And Downer Reactors, Chengxiu Wang
Electronic Thesis and Dissertation Repository
A systematic and comprehensive study of hydrodynamics and reactor performance was conducted in a 76 mm i.d., 10 m high riser and a 76 mm i.d., 5.8 m high downer reactor under high density/flux operating conditions using fluid catalytic cracking (FCC) catalyst particles. An optical fiber probe was used to obtain a complete mapping of local solids holdup and particle velocity. Catalytic ozone decomposition reaction was employed to study the characteristics of reactor performance in the CFB riser and downer. The superficial gas velocity (Ug) and the solids circulation rate (Gs) were 3-9 m/s …
Development And Application Of An Experimental Model For The Fluid Coking Process, Carolina B. Morales
Development And Application Of An Experimental Model For The Fluid Coking Process, Carolina B. Morales
Electronic Thesis and Dissertation Repository
Liquid injection into a fluidized bed is used in industrial applications such as the Fluid CokingTM process for heavy oil thermal cracking. Poor initial liquid-solid contact results in the formation of agglomerates that limit heat and mass transfer processes, reduce the yield of valuable compounds and create operating problems. The present study develops a new experimental model to simulate the complex phenomena that occur when heavy oil is injected in a Fluid Coker through two-phase nozzles. The model is applied in a pilot scale fluidized bed using scaled-down industrial spray nozzles. The experimental results indicate that agglomerate formation slows …