摘要
为了提高船舶柴油机排气流量计算精度,利用柴油机不完全燃烧化学反应方程及元素质量平衡关系,推导出一种新的排气流量NOx比排放计算方法,不需要计算CO2的浓度参数,避免排放量的迭代计算.为适应NOx排放实船测试的特点和要求,探讨了基于该方法的近似计算方法和排气浓度简化测试方案.新方法比简单碳平衡法排气流量计算精度高1.1%～1.5%,NOx比排放计算精度高0.3%～0.6%,忽略CO、HC成分浓度所造成的加权NOx比排放误差在0.2%以内.结果分析表明,忽略排气中CO和HC的实船简化测试方案是可行的,NOx排放实船测试可以采用便携式气体分析仪.
In order to improve the computation precision of exhaust gas flows, a new calculation method of brake NOx emission from marine diesel engine was deduced by chemical reaction equations based on incomplete combustion and the principle of element quality balance, CO2 gas was ignored, iterative calculation was avoided. For meeting the requirements and characteristics of on-board measurement of NOx emission, approximate calculation methods based on the new method and simplified measurement were discussed. The calculation result of a example shows that the exhaust gas flows calculated by the new method are more accurate by 1.1% ～ 1.5 % than by carbon balance method, brake NOx emission is more accurate by 0.3%～0. 6%, and the error of weighted brake NOx emission caused from ignoring CO and HC is less than 0.2%. The result proves the feasibility of simplified on-board measurement of NOx emission because of ignoring CO and HC by handy gas analyzer. 3 tabs, 5 figs, 4 refs.
出处
《交通运输工程学报》
EI
CSCD
北大核心
2005年第4期67-71,81,共6页
Journal of Traffic and Transportation Engineering
基金
国家自然科学基金项目(50276006)
关键词
轮机工程
船舶柴油机
NOX排放
实船测试
计算方法
marine engineering
marine diesel engine
NOx emission
on-board measurement
calculation method
