Numerical comparison of two modes of gas-solid riser operation： Fluid catalytic cracking vs CFB combustor
Numerical comparison of two modes of gas-solid riser operation： Fluid catalytic cracking vs CFB combustor作者机构：Stare Key Laboratory afMultiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemical Engineering Sichuan University Chengdu 610065 China Stare Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China University of Chinese Academy of Sciences Beijing 100049 China
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2017年第15卷第2期
页 面：42-48页
核心收录：
学科分类：07[理学]
基 金：This work is financially supported by the National Natural Science Foundation of China under Grant Nos. 91334204 and 21576263 the Chinese Academy of Sciences under Grant No. XDA07080100 and the Ministry of Science and Technology of the People's Republic of China under Grant No. 2012CB215003
主 题：Fluidization Computational fluid dynamics Simulation Fluid catalytic cracking Circulating fluidized bed Choking
摘 要：Two modes of gas-solid riser operation, i.e., fluid catalytic cracking （FCC） and circulating fluidized bed combustor （CFBC）, have been recognized in literature; particularly in the understanding of choking phenomena. This work compares these two modes of operation through computational fluid dynamics （CFD） simulation. In CFD simulations, the different operations are represented by fixing appropriate boundary conditions： solids flux or solids inventory. It is found that the FCC and CFBC modes generally have the same dependence of solids flux on the mean solids volume fraction or solids inventory. However, during the choking transition, the FCC mode of operation needs more time to reach a steady state; thus the FCC system may have insufficient time to respond to valve adjustments or flow state change, leading to the choking. The difference between FCC and CFBC systems is more pronounced for the systems with longer risers. A more detailed investigation of these two modes of riser operation may require a three-dimensional full loop simulation with dynamic valve adjustment.
维普期刊数据库