摘要
利用专业的缸内燃烧计算软件AVL FIRE,建立船用中速柴油机8340燃烧室有限元模型,并对其进行了验证。在该模型基础上,针对进气温度及喷油正时对NOx排放的影响进行计算研究,并提出合理的优化措施。结果表明,通过Miller循环,活塞头振荡冷却结合高压共轨技术来降低进气温度,推迟喷油正时,可有效降低NOx排放量至2.22 g/(kW·h),满足IMO TierⅢ的排放要求。
The simulation model of marine medium speed diesel engine 8340 is built by professional combustion calculation software AVL FIRE. After verifying, the influence of intake temperature and injection timing on NOx emission is calculated on the base of the finite element model. And a reasonable optimizing measurement is proposed also. The result shows that using Miller-cycle, oscillating cooling piston and electronic controlled high pressure common rail to cool down the intake temperature and delay injection timing can decrease the NOx emission to 2.22 g/（kW·h） which satisfied the requirement of IMO Tier Ⅲ.
出处
《内燃机》
2013年第5期52-54,62,共4页
Internal Combustion Engines
关键词
中速柴油机
NOx
进气温度
喷油正时
medium diesel engine
NOx
intake temperature
injection timing
