扩散火焰中丁醇对排放中粒子数量的影响

张克松¹，丁文浩²，崔福兴³

1.山东交通学院汽车工程学院，山东 济南  250357；2.山东琦瑞能源科技有限公司，山东 济南   250101；

3.国网山东省电力公司电力科学研究院，山东 济南   250014

摘要：为研究正丁醇对甲苯的稀释作用及正丁醇中的氧对尾气中粒子数量（particle number，PN）的影响，以正庚烷/甲苯/正丁醇为燃料，利用扩散充电式颗粒计数器测量自然对流扩散火焰中的PN，分析无正丁醇时二元燃料中甲苯体积分数对粒子数密度的影响，评估稀释作用对PN的影响；保持正庚烷和甲苯的体积比为83/17，分析添加正丁醇时三元燃料产生的粒子数密度，通过三元燃料与二元燃粒产生的粒子数密度的差评估氧的作用对PN的影响。结果表明：稀释效应对减少PN的作用更大；当正丁醇体积分数大于6%时，燃料中的氧开始促进颗粒的氧化，当正丁醇体积分数为13%时，燃料氧促进颗粒氧化的效果最大。

关键词：正丁醇；PN；扩散火焰

Effect of butanol on the particle number emission in diffusion flame

ZHANG Kesong¹, DING Wenhao², CUI Fuxing³

1. School of Automotive Engineering, Shandong Jiaotong University, Jinan 250357, China；

2. Shandong Qirui Energy Technology Co., Ltd., Jinan 250101, China；

3. State Grid Shandong Electric Power Research Institute, Jinan 250014, China

Abstract: To investigate the dilution effect of n-butanol on toluene and the influence of oxygen in n-butanol on particle number (PN), using n-heptane/toluene/n-butanol as fuel, a diffusion charging particle counter is used to measure PN in a natural convection diffusion flame. Firstly, the effect of toluene volume fraction in binary fuel without n-butanol on PN is studied, and the effect of dilution on PN is evaluated; then maintain the volume ratio of n-heptane to toluene at 83/17, study the PN generated by ternary fuel adding n-butanol, and evaluate the effect of oxygen on PN by the difference in particle number density between the binary and ternary fuel. The results indicate that the dilution effect has a greater effect on reducing PN. When the volume fraction of n-butanol is greater than 6%, oxygen in the fuel begins to promote particle oxidation. When the volume fraction is 13%, the effect of fuel oxygen on promoting particle oxidation is the greatest.

Keywords: n-butanol; PN; diffusion flame