由于船舶机舱空间狭小，因此布置用于二冲程柴油机的SCR反应器和其管道较为困难。利用CFD模拟了在100%负荷下SCR反应器之前的尿素雾滴和排气的混合过程。模拟结果表明，当6S35ME-B9 SCR系统的旋转角和护盖展开角分别为15°和75°时，尿素与排气在较短的距离内能够形成良好的混合，并且整个系统压降小于1.4 kPa。对安装有SCR系统的6S35ME-B9柴油机进行了100 h的测试，结果表明NOx排放从18.15 g/kWh降低到3.17 g/kWh。针对6S35ME-B9柴油机的SCR系统的设计和试验可以为实船上的SCR系统提供理论和应用基础。
Due to the narrow space of ship engine room，the arrangement of the two stroke diesel engine SCR (Urea-SCR, Urea, Selective, Catalytic, Reduction) reactor and its pipe is difficult. CFD was used to simulate the mixing process of urea droplets and smoke exhaust in the front straight mixing section of a SCR reactor under 100% load. Finally, when the rotation angle and shroud expansion angle of 6S35ME-B9 SCR system were 15 degrees and 75 degrees, reducer forms a well mixing with the exhaust gas in a short distance and the whole system pressure drop is less than 1400Pa. Through the full scale SCR system, the 6S35ME-B9 engine is tested for 100 hours, and NOx emissions were reduced from 18.15 g/kWh to 3.17 g/kWh. The design of the full scale SCR system of 6S35ME-B9 marine diesel engine and bench test, it provides the theory and application foundation for the real ship SCR system.
2021,43(12): 136-139 收稿日期：2020-07-20
DOI：10.3404/j.issn.1672-7649.2021.12.024
分类号：TK421+.5
基金项目：国家自然科学基金资助项目（51309149）
作者简介：林建辉(1974-),男,高级工程师,研究方向为机电
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