船用SCR催化反应器流场分析及结构参数优化研究  

Flow Field Analysis and Structure Parameter Optimization of Marine SCR Catalytic Reactor

作　　者：许越 倪培永[1] 陈旭[2] 喜冠南[1] XU Yue;NI Pei-yong;CHEN Xu;XI Guan-nan(School of Mechanical Engineering,Nantong University,Jiangsu Nantong 226019,China;Nantong Diesel Engine Co.Ltd,Jiangsu Nantong 226014,China)

机构地区：[1]南通大学机械工程学院,江苏南通226019 [2]南通柴油机股份有限公司,江苏南通226014

出　　处：《机械设计与制造》2023年第9期84-88,共5页Machinery Design & Manufacture

基　　金：国家重点研发计划项目(2017YFE0116100)。

摘　　要：利用AVL FIRE软件,建立船用SCR催化反应器三维仿真模型,模拟了不同入口进气流量工况下催化反应器内部的流场特性,研究了不同扩张角、载体长度、收缩角等结构参数对催化反应器内流场特性的影响。研究结果表明,不同工况下的催化反应器内的流速分布和压力分布规律基本一致,进气流量越大,催化反应器内的流速分布越不均匀,压力损失越大。随着扩张角的增大,催化剂载体内的流速均匀性变差,压力损失增大。随着载体长度的增加,催化器的压力损失显著增加。适当地增加载体长度可以提高载体内的流速均匀性。当收缩角由20°增加到90°时,催化器的压力损失略有增加,载体内的流速分布均匀性的略有减小,但与扩张角相比,变化较小。当收缩角增加到120°时,载体内的流速均匀性显著降低,压力损失显著增加。该研究为船用SCR催化反应器的结构优化设计提供指导。A three-dimensional simulation model of a marine SCR catalytic reactor was established to simulate the flow field characteristics inside the catalytic reactor under different inlet air flow conditions by using AVL FIRE software.The influences of the structural parameters of different expansion angles,carrier lengths and contraction angles on the flow field characteristics in the catalytic reactor were carried out.The results show that the flow rate distribution and pressure distribution in the catalytic reactor under different working conditions are basically the same.The larger the intake air flow,the more uneven the flow rate in the catalytic reactor and the greater the pressure loss.As the expansion angle increases,the uniformity of the flow velocity in the catalyst carrier becomes worse,and the pressure loss increases.As the length of the carrier increases,the pressure loss of the catalyst increases significantly.Properly increasing the length of the carrier can improve the uniformity of the flow rate in the carrier.When the contraction angle increases from 20°to 90°,the pressure loss of the catalyst increases slightly,and the uniformity of the flow velocity distribution in the carrier decreases slightly,but compared with the expansion angle,the change is small.When the contraction angle increases to 120°,the uniformity of the flow velocity in the carrier is significantly reduced,and the pressure loss is significantly increased.This research provides guidance for the structural optimization design of marine SCR catalytic reactor.

关 键 词：催化反应器 流场 结构参数 优化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]