The use of coal-based F-T diesel in automobiles can alleviate the shortage of petroleum and promote clean utilization of coal. In this study, the effects of injection timing and rail pressure on the emissions of NOx, soot, and UFPs from F-T diesel and petro-diesel were investigated in a common rail DI engine under a constant speed and various loads. The rail pressures are selected as 70 MPa and 100 MPa, whereas the injection timings are regulated at 2 °CA, 6 °CA, 10 °CA, 14 °CA, and 18 °CA BTDC. Experimental results indicate that advancing the injection timing or increasing the rail pressure shall result in higher NOx and lower soot emissions. When the fuel injection timing was advanced from 2 °CA to 18 °CA BTDC, the number concentration of UFPs first decreased and then increased at low loads, whereas the number concentration of UFPs always decreased at medium and high loads, the peak number concentration transferred from the size range of accumulation mode particles to that of nucleation mode particles, and the geometric mean diameters of UFPs emitted by the F-T diesel and petro-diesel reduced by an average of 23.4% and 26.19% under different test conditions, respectively. In addition, when the rail pressure was increased from 70 MPa to 100 MPa, the number concentration of UFPs of F-T diesel and petro-diesel decreased by 39.78% and 53.75%, and their geometric mean diameters of UFPs decreased by 14.09% and 12.5%, respectively. Compared to petro-diesel, F-T diesel has a lower number concentration of UFPs, smaller geometric mean diameter of UFPs, and a higher ratio of nucleation mode particles. With regard to the lowest number concentration of UFPs, when coal-based F-T diesel is used, the injection timing of the original engine can be advanced by 4–8 °CA at low loads.

在汽车中使用煤基FT柴油可以减轻石油短缺，并促进煤炭的清洁利用。在这项研究中，研究了在恒定速度和各种负载下的共轨DI发动机中，喷射正时和导轨压力对FT柴油和石油柴油中NO x，烟灰和UFP排放的影响。轨道压力选择为70 MPa和100 MPa，而喷射正时调节为BTDC 2 CA，6 CA，10 CA，14 CA和18CA。实验结果表明，提前喷射正时或提高轨道压力会导致更高的NO x并减少烟尘排放。当燃油喷射正时从BTDC从2°CA提前到18°CA BTDC时，UFP的数量浓度在低负载下先下降，然后增加，而在中负载和高负载下UFP的数量浓度总是下降，峰值数量浓度转移从累积模式颗粒的大小范围到成核模式颗粒的大小范围，在不同的测试条件下，FT柴油和石油柴油排放的UFP的几何平均直径分别平均降低了23.4％和26.19％。此外，当轨压从70 MPa增加到100 MPa时，FT柴油和石油柴油的UFP数量浓度分别降低了39.78％和53.75％，它们的几何平均直径分别降低了14.09％和12.5％。 ， 分别。与石油柴油相比，FT柴油的UFP浓度较低，UFP的几何平均直径较小，并且成核模式颗粒的比例较高。关于UFP的最低浓度，当使用煤基FT柴油时，在低负荷下，原始发动机的喷射正时可以提前4–8°CA。