国Ⅳ SCR发动机瞬态循环下NH3泄漏特性研究

摘要

On six stage IV engines with SCR, ETC experiments were carried out and NH3 slip was analyzed. The results show that more NH3 slips in dragging conditions of low speed and low loads. In high speed, more NH3 also slips and shows the increase trend with the increase of load. In addition, the sudden increase or decrease of exhaust temperature will also lead to the slip of NH3.%对6台采用SCR后处理技术的国Ⅳ排放水平的发动机进行了瞬态ETC测试,分析其NH3泄漏特性.研究发现:低速时发动机反拖及小负荷工况下的NH3泄漏量较大；高速时NH3泄漏量较大,且随着负荷的增大呈现增大的趋势；排温突然升高或降低都可能导致NH3泄漏.