SONG Chao1,2, YE Mao1, LIU Zhongmin1
(1. a. Dalian Institute of Chemical Physics; b. National Engineering Laboratory for Methanol-to-Olefins, Chinese Academy of Sciences,Dalian 116023, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract: In order to reasonably control the combustion reaction of carbon deposition in fluidized bed catalyst regenerator of methanol to olefin process system, the regeneration kinetics of chemical reaction equation was coupled to the discrete element model (DEM) using computational fluid dynamics (CFD). The simulated two-dimensional and three-dimensional simulation of the catalyst regeneration process was carried out using CFD-DEM model. The influence of different inlet gas velocities on catalyst regeneration process was investigated from the aspects of particle flow pattern, particle property, carbon distribution and gas composition of regenerator. The results show that with the increase of inlet gas velocity, the fluidization rate of the regenerated catalyst particles is accelerated, the carbon distribution is narrowed, and the fluidization state of the whole particles tends to be uniform. The carbon mass fraction of the regenerated catalyst decreases with the increase of time and decreases with the increase of inlet gas velocity. The catalyst density decreased slightly with the increase of reaction time. With the increase of the inlet gas velocity, the time needed for the regeneration reaction to reach the equilibrium state will be greatly shortened. When inlet gas velocity is greater than 0.05 m/s, oxygen can quickly reach saturation.
Keywords: methanol to olefins; catalyst regeneration; CFD-DEM model; numerical simulation
文章编号：1008-5548(2020)03-0039-07
DOI:10.13732/j.issn.1008-5548.2020.03.006
中图分类号：TQ032 文献标志码：A
收稿日期： 2019-10-10，修回日期：2020-02-14，在线出版时间：2020-04-03 15:09。
基金项目：国家自然科学基金项目，编号：91834302。
第一作者简介：宋超(1990—)，男，硕士研究生，研究方向为化学工程。E-mail：songchao17@dicp.ac.cn。
通信作者简介：叶茂(1973—)，男，博士，研究员，博士生导师，研究方向为化学工程多相流。E-mail：maoye@dicp.ac.cn。
