文献类型：期刊文献

中文题名：颗粒分辨的乙炔选择性加氢固定床反应器数值模拟

英文题名：Numerical simulation of particle-resolved fixed-bed reactor for selective acetylene hydrogenation process

作者：李泓宇[1];刘祥坤[1];施尧[1];曹约强[1];钱刚[1];段学志[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2024

卷号：75

期号：10

起止页码：3610

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：20251218059632);北大核心:【北大核心2023】；CSCD:【CSCD2023_2024】；

基金：国家自然科学基金项目(22008067)。

语种：中文

中文关键词：乙炔选择性加氢;固定床反应器;数值模拟;传质;传热

外文关键词：selective acetylene hydrogenation;fixed-bed reactor;numerical simulation;mass transfer;heat transfer

摘要：乙烯产量是反映国家石油化工发展水平的关键指标。构建了颗粒分辨的乙炔选择性加氢固定床反应器模型,分析圆柱形颗粒堆积结构对传递过程以及操作条件对其反应性能的影响。结果表明,床层压降主要集中在反应器入口段,该段乙炔加氢反应速率最高,但在后半段催化剂颗粒未被充分利用,而且反应器内存在明显的径向温度梯度。入口压力的增加和空速的降低均有利于提升乙炔转化率,但同时会降低乙烯选择性,其中乙烯选择性对压力更敏感,而乙炔转化率对空速更敏感;反应温度和氢炔比的提高均有利于促进乙炔生成乙烯的速率,但会导致乙烯富集在催化剂颗粒的外表面,其进一步向颗粒内部扩散时过度加氢生成乙烷,使乙烯选择性降低。
Ethylene production is a key indicator reflecting the development level of a countrys petrochemical industry.A particle-resolved fixed-bed reactor model for selective acetylene hydrogenation process has been established.The impact of cylindrical particle packing structure on the transport processes has been analyzed and the influence of operational conditions on the reaction performance has been explored.The results showed that the pressure drop in the catalyst bed mainly happened in the entrance section of the reactor,where the reaction rate of acetylene hydrogenation is the highest.However,in the latter half of the bed,the catalyst particles are not fully utilized,and there is a significant radial temperature gradient within the reactor.In terms of operational conditions,increasing the inlet pressure and decreasing the gas velocity both favor the improvement of acetylene conversion rate,but at the same time,they would reduce the selectivity of ethylene,where the selectivity of ethylene is more sensitive to pressure,and the conversion of acetylene is more sensitive to gas velocity.The increase in reaction temperature and hydrogen-to-acetylene ratio both help to promote the acetylene conversion to ethylene,but it can lead to the enrichment of ethylene on the exterior surface of the catalyst particles,which when diffusing further into the interior zone,can be over-hydrogenated to ethane,thus reducing the selectivity of ethylene.