农用机械柴油机DPF再生性能的建模与仿真

Modeling and simulation of DPF regeneration performance of diesel engine

为了更好地对农用机械柴油机颗粒捕集器(Diesel Particulate Filter,DPF)的再生性能进行优化,降低农用机械尾气中的颗粒物含量,对DPF再生原理进行数学分析,并在GT-Power中建立模型。通过单因素实验和设计正交试验,研究了各个影响因素对于通道内最大峰值温度和再生时间的影响规律。结果表明:对通道内最大峰值温度,各因素的影响能力从大到小依次为初始沉淀物密度、进气温度、进气中氧气含量和进气流量;对再生所需时间,各因素的影响能力从大到小依次为进气温度、进气中氧气含量、进气流量和初始沉淀物密度。最后将这2个指标结合起来综合考虑,得到最佳取值方案:载体内初始沉积的颗粒物密度取1 g/L,进气温度取400℃,进气中氧气含量取16%,进气流量取240 L/s。仿真后体通道内最大峰值温度为424.6℃,再生所需时间为193 s时再生性能为最佳。

In order to optimize the regeneration performance of Diesel Particulate Filter(DPF)and reduce the particulate content in the tail gas of agricultural vehicles,the principle of DPF regeneration was analyzed and a model was established in GT-POWER.Through single factor experiment and design orthogonal experiment,the influences of various influencing factors on the maximum peak temperature and regeneration time in the channel were studied.The results show that the influence of each factor on the maximum peak temperature in the channel is in the order of density,intake temperature,oxygen content and intake flow.For the regeneration time,the influence of each factor is the inlet temperature,the oxygen content in the intake,the inlet flow rate and the density in descending order.Combining these two indexes,the best value scheme was obtained:the density of particulate matter deposited in the carrier was 1 g/L;the intake temperature was 400℃;16% oxygen content in the intake air;The intake flow rate was 240 L/s.The simulation results show that the regenerative energy is the best when the maximum peak temperature in the body channel is 424.6℃,and the regeneration time is 193 s.