【摘要】 根据Arrhenius方程建立催化型柴油机颗粒捕集器（CDPF）被动再生化学反应模型。通过在一台重型柴油发动机上进行台架试验,对建立的CDPF被动再生模型进行标定和验证,标定后的CDPF被动再生模型可很好地预测CDPF中碳烟被NO₂氧化的反应速率。结果表明,碳烟氧化速率随CDPF初始碳载量的增大和床温的升高而提高;在初始碳载量为3.8 g/L、NO_x含量为550×10^-6的工况下CDPF平衡温度约为283℃;增加NO_x排放可促进CDPF被动再生的进行,降低被动再生平衡点碳载量和平衡温度;再生平衡曲线与预设碳载量有关,随着预设碳载量的增大,再生平衡曲线下移,被动再生区域增大。更多还原

【Abstract】 Based on Arrhenius equation, a chemical reaction model for passive regeneration of catalyzed diesel particulate filter（CDPF） is established and then calibrated and verified by the bench test on a heavy-duty diesel engine. The calibrated model can well predict the reaction rate of soot oxidation by NO₂ in CDPF. Results show that soot oxidation rate, i.e. passive regeneration rate rises with the increases of the soot loading and temperature of CDPF, and under the operation condition of a 3.8 g/L soot loading and a 550×10^-6 NO_x concentration, the balance temperature of CDPF is around 283 ℃. Higher NO_x emission is beneficial to CDPF passive regeneration and can reduce the soot loading and temperature at DCPF balance point. The regeneration balance curve depends on the preset soot loading of CDPF, as the preset soot loading increases, the regeneration balance curve moves downward, and hence the passive regeneration region enlarges.更多还原