Measurement of Soot Yield from the Pyrolysis of Toluene at High Temperatures by Laser Extinction Method
XIAN Lei-yong1, LI You-liang1, HE Jiu-ning1, ZHANG Chang-hua1*, LI Ping1, LI Xiang-yuan2
1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
2. College of Chemical Engineering, Sichuan University, Chengdu 610065, China
Abstract：The measurement system for the detection of soot production as high-temperature pyrolysis of hydrocarbon fuels behind the reflected shock wave was established. By using the laser extinction method, the soot yields of toluene/argon mixtures were measured at high temperatures. The mole fractions of toluene were 0.25% and 0.5% while the pressures were approximate 2 and 4 atm. The temperatures ranged from 1 630 to 2 273 K. The dependence of soot yield on the temperature, pressure and fuel concentration was obtained. With the changes of temperature, the soot yield is a Gauss distribution. The soot yield increases as the pressure or fuel concentration increases. The maximum of soot yield was as high as 55%. The peak temperature of soot yield was not changed dramatically with the pressure. However, it changed from 1 852 to 1 921 K as the concentration of toluene increase from 0.25% to 0.5%. Moreover, we compared the soot yield between toluene and methylcyclohexane at pressure of 4 atm with fuel concertation of 0.5%. During the pyrolysis of methylcyclohexane, the peak temperature of soot yield was 2 045 K, which is about 135 K higher than that of toluene. However, the maximum soot yield of methylcyclohexane is only 1/8 of toluene. This work provides experimental reference for the research of soot particle emission in the engines and the mechanism of soot formation.
鲜雷勇1，李有亮1，何九宁1，张昌华1*，李 萍1，李象远2 . 激光消光法测量甲苯高温裂解的碳烟产率 [J]. 光谱学与光谱分析, 2016, 36(11): 3481-3484.
XIAN Lei-yong1, LI You-liang1, HE Jiu-ning1, ZHANG Chang-hua1*, LI Ping1, LI Xiang-yuan2 . Measurement of Soot Yield from the Pyrolysis of Toluene at High Temperatures by Laser Extinction Method. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(11): 3481-3484.
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