船用柴油机尾气喷淋系统净化颗粒物试验及气液分离模拟研究  

Experimental study on particulate matter purification and gas-liquid separation simulation of diesel engine exhaust spray system

作　　者：范宇航 罗力 倪培永[1] 邓勇[1] 喜冠南[1] FAN Yuhang;LUO Li;NI Peiyong;DENG Yong;XI Guannan(School of Mechanical Engineering,Nantong University,Nantong Jiangsu 226019)

机构地区：[1]南通大学机械工程学院,江苏南通226019

出　　处：《环境污染与防治》2021年第11期1379-1382,共4页Environmental Pollution & Control

基　　金：国家重点资助项目(No.2017YFE0116100)。

摘　　要：根据喷淋碰撞凝结分离模型和颗粒物/液滴/气体分离理论,设计出一种带有挡板结构的新型柴油机尾气颗粒物净化装置,同时通过台架试验验证该装置的可行性和净化效率,并与两相流分离的模拟数值进行对比分析。结果表明:(1)柴油机尾气颗粒物净化效率随功率的增加而提升。(2)交替设置的弓形挡板在装置内诱导产生了离散相速度由外圈向中心呈逐渐减小趋势的涡旋流动,倒角设置可不同程度改善低速“流动死区”。(3)气相涡旋的存在不仅改善了液滴的逃逸现象,同时还延长了装置内离散相液滴停留时间。(4)当入口速度为2.0 m/s、喷淋量为0.25 kg/m^(3)时,分离效率达到最大值(49.08%)。According to the spray collision condensation separation model and the theory of particle droplet gas separation,a new diesel exhaust particle purification device with baffle structure was designed.At the same time,the feasibility and purification efficiency of the device were verified by bench test,and compared with the simulation value of two-phase flow separation.The results showed that:(1)the purification efficiency of diesel exhaust particulate matter increased with the increase of power.(2)The alternating bow baffles induce the vortex flow in which the discrete phase velocity gradually decreased from the outer ring to the center.The chamfering setting could improve the low-speed“flow dead zone”to varying degrees.(3)The existence of gas phase vortex not only improved the escape phenomenon of droplets,but also prolonged the residence time of discrete phase droplets in the device.(4)When the inlet speed was 2.0 m/s and the spray volume was 0.25 kg/m^(3),the separation efficiency reached the maximum(49.08%).

关 键 词：柴油机尾气 颗粒物 净化 两相流 模拟 

分 类 号：X701[环境科学与工程—环境工程]