炭化微米木纤维滤芯柴油机排放纳米颗粒吸附特性

Adsorption properties of carbonized micron wood fiber filter for nanoparticles emitted by engine

为了有效净化柴油机排放的纳米级碳烟颗粒(纳米颗粒),以炭化微米木纤维材料制备柴油机尾气微粒捕集器滤芯.分析炭化微米木纤维滤芯及柴油机排放颗粒物特性,并利用巨正则系综蒙特卡罗法(GCEMC)模拟纳米颗粒在炭化微米木纤维活性炭孔中的吸附特征,进而利用柴油机尾气微粒捕集器性能检测试验台对活性炭孔吸附纳米颗粒的蒙特卡罗模拟结果进行验证.结果表明:当柴油机微粒捕集器中尾气温度为470 K,捕集器前部压力由102.5 kPa过渡到125.0 kPa时,炭化微米木纤维滤芯吸附纳米粒子平均数密度的GCEMC模拟结果约为6.28×107cm-3,试验结果约为5.60×107cm-3,模拟结果和试验结果基本一致,该方法可以用来进行炭化微米木纤维滤芯吸附纳米颗粒过程的模拟研究.

To effectively collect the nanosized particulate material（ nanoparticles ） emitted by diesel, a diesel particulate filter（DPF） was prepared with carbonized micron wood fiber（CMWF） material. The characteristics of CMWF filter and particulate material （PM） were analyzed to simulate the absorption process of nanoparticles in CMWF filter based on grand canonical ensemble Monte Carlo method （GCEMC）. The numerical simulation result was verified by DPF performance test bench. The results show that when the pressure ranges from 102.5 kPa to 125.0 kPa at the temperature of 470 K, the adsorption number densities of nanoparticles in CMWF filter obtained by GCEMC and test are 6.28 ×10^cm^-3 and 5.60 ×10^cm^-3, respectively. The simulated results are in good consistency with the experimental results. The simulation method is suitable to investigate the adsorption process of nonoparticles in CMWF fiher.