DPF 热再生过程影响因素研究

摘要

A thermal regeneration model of diesel particulate filter (DPF) was established to study the influence of regenera‐tion conditions such as mixture flow ,regeneration temperature ,oxygen concentration and initial particle layer thickness on wall temperature peak and maximum temperature difference ,regeneration time or unit regeneration time and energy efficiency .The results indicate that properly improving the mixture flow ,regeneration temperature and oxygen concentration can all shorten the regeneration time .However ,excessive oxygen concentration and initial particle layer will lead to the too large wall temper‐ature peak and maximum temperature difference .Excessive mixture flow will lead to the low energy efficiency of DPF regenera‐tion .The optimal regeneration effect occurs at 900 K of regeneration temperature .%建立了柴油机微粒捕集器（DPF）的热再生模型，研究了再生条件（混合气流量、再生温度、氧气浓度、初始微粒层厚度）对DPF再生过程中壁面温度峰值、最大温差、再生时间或单位再生时间和能量效率的影响。研究结果表明，适当增大混合气流量、提高再生温度和氧气浓度都可以缩短再生时间；氧气浓度过高、初始微粒层太厚会导致再生过程中DPF的壁面温度峰值及最大温差过大；混合气流量过大会降低再生过程中能量利用率；再生温度为900 K时，再生效果最佳。