Influence of Urea Uneven Injection on the Performances of a Diesel Engine  

作　　者：Chang Huang Shuzhan Bai Guoxiang Li Ke Sun 

机构地区：[1]School of Energy and Power Engineering,Shandong University,Jinan,250061,China

出　　处：《Fluid Dynamics & Materials Processing》2023年第1期83-93,共11页流体力学与材料加工（英文）

基　　金：supported by the Natural Science Foundation Project of Shandong Provincial(Grant No.ZR2019MEE041);the open funds of National Engineering Laboratory of Mobile Source Emission Control Technology(Grant No.NELMS2019A01).

摘　　要：The influence of heterogeneous flow injection of urea at different velocities and temperatures on NO x conversion efficiency,ammonia storage and ammonia leakage is investigated experimentally.A diesel engine employing a selective catalytic reduction(SCR)technology is considered.It is found that for a fixed injection velocity,the degree of ammonia leakage changes depending on the temperature.The higher the temperature,the faster the catalytic reduction reaction and the smaller the degree of ammonia leakage.The temperature has a great influence on the catalytic reduction reaction rate.At an injection velocity of 10000/h,the average reaction rate at 420℃ is 12 times higher than that at 180℃.The injection velocity has a weak influence on the reaction rate.When the injection velocity changes from 10000/h to 40000/h at the same temperature,the average reaction rate does not change appreciably.However,increasing the space velocity can accelerate the leakage of ammonia,thereby miti-gating the benefits associated with the NO_(x) conversion.

关 键 词：Diesel engine ammonia leak conversion efficiency the urea FLOW 

分 类 号：O64[理学—物理化学]