以MAN 6S35 ME-B9型船用二冲程柴油机为研究对象，在GT-POWER软件中建立其工作过程一维模拟计算模型，通过改变EGR率和进气氧浓度，研究废气再循环和进气氧浓度对柴油机动力性、经济性和排放性能的影响。结果表明，提高EGR率会降低柴油机燃烧速率和燃烧温度，有效降低柴油机NOx生成及其排放，EGR率在28.89%~38.58%之间，NOx排放为3.04 ~1.34 g/kW·h，满足TierⅢ标准，但需要牺牲一部分经济性与动力性。贫氧进气条件下，燃烧温度和燃烧速率降低，输出功率降低，燃油消耗增加，NOx排放降低，碳烟排放较高；富氧进气条件下，柴油机燃烧趋于完善，能量利用率高，动力性和经济性好，Soot排放低，但NOx排放高。高EGR率条件下，在一定程度上提高进气氧浓度，可使柴油机NOx排放满足TierⅢ排放要求，并维持Soot排放在较低水平，同时减少动力性、经济性的损失。
Taking MAN 6S35 ME-B9 Marine two-stroke diesel engine as the research object, a one-dimensional simulation calculation model of its working process was established in GT-power software. By changing EGR rate and intake oxygen concentration, the effects of exhaust gas recycling and intake oxygen concentration on the dynamic, economic and emission performance of diesel engine were studied. The results show that the increase of EGR can reduce the combustion rate and combustion temperature of diesel engine, effectively reduce the NOx generation and emission of diesel engine, the EGR rate is between 28.89% and 38.58%, and the NOx emission is 3.04~1.34 g/ kW·h, which meets the Tier Ⅲ standard, but some economic and power performance needs to be sacrificed. Under the condition of lean oxygen intake, the combustion temperature and combustion rate decrease, the output power decreases, the fuel consumption increases, the NOx emission decreases, and the soot emission is high. Under the condition of oxygen-rich intake, tending to perfect diesel engine combustion, high energy utilization rate, good performance and fuel economy, Soot emissions low, but high NOx emissions. under the condition of high EGR rate, to some extent, increase the inlet oxygen concentration, can make the diesel engine NOx emissions meets the demand of ship three phase emissions, and maintain the Soot emissions at a lower level, at the same time, reduce the loss of dynamic and economic performance.
2020,42(8): 127-133 收稿日期：2019-07-11
DOI：10.3404/j.issn.1672-7649.2020.08.024
分类号：TK421+.2;TK421+.5
基金项目：上海海事大学研究生创新基金(2015ycx047)
作者简介：李方玉(1991-),男,硕士研究生,主要研究方向为柴油机数值模拟与性能优化
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