不同海拔下柴油机燃用BED燃料的常规排放分析

Conventional Emission Analysis of Diesel BED Fuel at Different Elevations

为研究高压共轨柴油机在高原地区使用纯柴油和乙醇—生物柴油—柴油(BED)燃料时的常规排放,模拟平原地区大气压力,与单组BED燃料和纯柴油在高原地区的常规排放进行对比。试验表明,增大空气压力,过量空气系数增加。使用纯柴油时,CO和HC在高转速时明显降低,中等转速时升高,而NOx和PM明显降低;使用BED燃料时,CO排放量降低,NOx增多,而PM值大幅度下降。某些工况下,使用BED燃料可以降低HC和PM的排放量。

In order to study the conventional emission of high pressure common rail diesel engine when using pure diesel and ethanol-biodiesel-diesel(BED)fuel in highland area,the atmospheric pressure in the simulated plain area is compared with the conventional emissions of single-group BED fuel and pure diesel in plateau region.The experiment shows that with increase of air pressure,the excess air coefficient increases.When using pure diesel,CO and HC are significantly reduced at high rotational speed,and increase at medium speed while NOx and PM are significantly reduced.When BED fuel is used,CO emissions are reduced,NOx increases,and PM decreases significantly.In some cases,the use of BED fuel can reduce HC and PM emissions.