柴油轿车燃用煤基F-T合成燃料的瞬态工况排放特性

Research on NEDC Real-Time Continuous Emission Properties of a Diesel Car Fueled with Coal Based F-T Synthetic Diesel

依据GB 18352.3—2005Ⅰ型试验循环,对满足国Ⅳ排放标准的国产柴油轿车分别燃用国Ⅱ柴油(简称为F-T0);混合比例为10%(90%为国Ⅱ柴油,10%为煤基F-T合成燃料,体积比,简称为F-T10)的国Ⅱ柴油-煤基F-T合成燃料混合燃料的HC、CO、NOx、CO2和颗粒数量瞬态排放属性进行了研究。结果表明,GB 18352.3—2005Ⅰ型试验循环中,该车燃用F-T0与F-T10加速工况的HC、CO、NOx和CO2排放较高;随着车速的增加,该车燃用F-T0与F-T10的CO排放降低,CO2和NOx排放增加,HC排放呈先增加后下降再增加的变化趋势,核模态颗粒数量排放呈先增加后下降的变化趋势,积聚态颗粒数量排放呈先下降后升高再下降的变化趋势;随着车辆加速度的增加,该车燃用F-T0与F-T10的HC、CO、NOx和CO2排放增加;F-T0与F-T10怠速和匀速工况的核模态、积聚态颗粒数量排放较低;F-T0加速工况的核模态颗粒数量较高,F-T10低速加速及高速减速工况的核模态颗粒数量较高;F-T0与F-T10减速工况的积聚态颗粒数量排放较高;煤基F-T合成燃料可有效降低该柴油轿车的HC、CO、NOx、CO2和颗粒数量排放。

According to the Ⅰ-type test cycle of China national standard GB18352.3--2005, which is the same as that of New Europe Driving Cycle （NEDC）, the real-time continuous monitoring for vehicle emissions of HC, CO, NOx, CO2 and particle number during NEDC when fueled with either coal-based Fischer-Tropsch （F-T） synthetic diesel blends （called F-T10, blend 10% of F-T synthetic diesel in conventional diesel by volume） or conventional diesel （called F-T0） were carried out respectively. The tested diesel car, developed and manufactured in China completely, meets the fourth China national emission standard. The results show that the HC, CO, NOx, CO2 emissions of the tested vehicle fueled by either F-T0 or F-T10 is higher in the acceleration operating mode during NEDC. With the increase of driving speed, the vehicle emissions of CO2 and NOx increased, whereas its CO emissions decreased, its nucleation mode particle number concentration increased first and then decreased, its accumulation mode particle number concentration decreased first and then increased, followed by a decrease again, and its HC emissions increased first and then decreased, followed by an increase again. The HC, CO, NOx , CO2 emissions of the vehicle fueled with F-T0 or F-T10 increased with increasing acceleration of the vehicle during NEDC. Moreover, the vehicle emission of nucleation and accumulation mode particle concentration for idling and constant speed driving are lower than in other driving modes, and the nucleation mode particle concentration of the vehicle fueled with F-T0 in acceleration driving mode is higher, while its nucleation mode particle concentration when fueled with F-T10 is higher for both tile acceleration at low speed and deceleration at high speed. In one word, the HC, CO, NOx, CO2 and particle number emissions of diesel car were reduced when the coal-based F-T synthetic diesel is blended with tire conventional diesel.