Influence of Urea Uneven Injection on the Performances of a Diesel Engine
作者机构：School of Energy and Power EngineeringShandong UniversityJinan250061China
出 版 物：《Fluid Dynamics & Materials Processing》 (流体力学与材料加工（英文）)
年 卷 期：2023年第19卷第1期
页 面：83-93页
核心收录：
学科分类：07[理学] 070304[理学-物理化学(含∶化学物理)] 0703[理学-化学]
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).
主 题：Diesel engine ammonia leak conversion efficiency the urea flow
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.
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