Numerical Investigation of High Efficient Production of Propylene In Multi-Regime FCC Riser

Computational fluid dynamic simulation was preformed to clarify real reaction process in a novel multi-regime gas solid fluidized riser reactor. Advantages of such kind of reactor in higher propylene selectivity have been proved in a industrial scale demonstration unit already. Difference of flow field and phase distribution between this reactor and traditional ones has been compared. Analysis based on technique principle of propylene production was conducted. Various functional zones could be identified in lower part of such an integrated multi-regime riser reactor. Controlled transition from high density bubbly fluidized bed to a fast circulating bed contributes to higher LPG olefin content as well as lower coke production. Predominant importance of feed mixing zone could be recognized from more than half of overall conversion taking place in this section. Validation of simulation result could be obtained by comparing simulated solid circulating rate with benchmark result of this real industrial unit. Simultaneous getting hold of remarkable high propylene yield (>20%) as well as low yield of coke and off gas could demonstrate the superior of this novel process technology. Numerical simulation investigation gives more insight during the development of new process technology.