某柴油机尾气后处理装置空速计算方法
刘建军1,2,张建华2,王明杰2,白书战1*
1.山东大学能源与动力工程学院,山东 济南 250061;2.山东交通学院,山东 济南 250357
摘要:为提高柴油机后处理装置性能,分析排气质量流量计算方法,开展台架试验采集标准工况下柴油机的进气质量流量;基于进气密度和进气质量流量,分别用进气流量和油耗量测量法、碳平衡法计算尾气后处理装置的空速,并对比2种计算方法的有效性。结果表明:进气质量流量和油耗量测量法、碳平衡法计算的尾气后处理装置空速结果接近,2种方法计算的空速的相对误差为3.94%,均可用于柴油机尾气后处理装置空速计算;相比碳平衡法,基于进气质量流量和油耗量测量法更容易实现。
关键词:柴油机;尾气后处理;空速;排气流量;有效容积
Space velocity calculation of exhaust after-treatment device for a diesel engine
LIU Jianjun1,2, ZHANG Jianhua2, WANG Mingjie2, BAI Shuzhan1*
1.School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
2.Shandong Jiaotong University, Jinan 250357, China
Abstract: To improve the performance of diesel engine after-treatment device, the calculation method of exhaust mass flow rate is analyzed, and validated by bench tests to collect the intake mass flow rate of diesel engines under the rated conditions. Based on the intake density and intake mass flow rate, the airspeed of the after-treatment of exhaust gas device is calculated using the intake air flow rate and fuel consumption measurement method, as well as the carbon balance method, respectively, and the effectiveness of the two calculation methods is compared. The results show that the air velocity of the after-treatment of exhaust gas device calculated by the intake mass flow rate and fuel consumption measurement method, as well as the carbon balance method, are close. The relative error of air velocity calculated by the two methods is 3.94%, which can be used for calculating the air velocity of diesel engine after-treatment of exhaust gas devices. Compared with the carbon balance method, the measurement method based on intake mass flow rate and fuel consumption is easier to achieve.
Keywords: diesel engine; after-treatment of exhaust gas; space velocity; exhaust gas flow; effective volume