含氧量对颗粒捕集器热再生过程的影响
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摘要
通过GT-power软件建立柴油机颗粒捕集器(diesel particulate filter, DPF)的热再生模型,计算不同含氧量时再生过程的气体流速分布和碳烟密度分布,并分析含氧量和再生温度对DPF热再生效果的协同作用.结果表明:与φ(O_2)=0.11时DPF再生过程相比,当φ(O_2)=0.21时DPF入口通道内气体的流动更均匀,其壁面渗流速度更小,碳烟密度更低;在一定范围内,适当提高再生温度和氧气浓度有助于提高DPF的再生速率,但φ(O_2)>0.21后,含氧量的增加对再生效果的促进作用有所减弱.
Based on the GT-Power software, a regeneration model of diesel particulate filter(DPF) is established. The distribution of gas flow and soot density under different O_2 volume fraction in the regeneration process is simulated. And the synergistic effect of the O_2 volume fraction and the regeneration temperature on DPF regeneration performance is analyzed. The results show that a higher O_2 volume fraction of 0.21 is beneficial for the uniform flow of gas in DPF channels in the regeneration process compared to the condition of O_2 volume fraction of 0.11. Also, the wall velocity is smaller, and the soot density in the DPF is significantly reduced in the condition of φ(O_2)=0.21. It is demonstrated that appropriate increase of the regeneration temperature and the O_2 volume fraction will contribute to a higher regeneration rate of DPF, however, an O_2 volume fraction of higher than 0.21 will result in a weaker promotion effect of the oxygen-enriched environment on the regeneration performance.
Based on the GT-Power software, a regeneration model of diesel particulate filter(DPF) is established. The distribution of gas flow and soot density under different O_2 volume fraction in the regeneration process is simulated. And the synergistic effect of the O_2 volume fraction and the regeneration temperature on DPF regeneration performance is analyzed. The results show that a higher O_2 volume fraction of 0.21 is beneficial for the uniform flow of gas in DPF channels in the regeneration process compared to the condition of O_2 volume fraction of 0.11. Also, the wall velocity is smaller, and the soot density in the DPF is significantly reduced in the condition of φ(O_2)=0.21. It is demonstrated that appropriate increase of the regeneration temperature and the O_2 volume fraction will contribute to a higher regeneration rate of DPF, however, an O_2 volume fraction of higher than 0.21 will result in a weaker promotion effect of the oxygen-enriched environment on the regeneration performance.
引文
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[4] E Jiaqiang,ZUO Wei,GAO Junxu,et al.Effect analysis on pressure drop of the continuous regeneration-diesel particulate filter based on NO2 assisted regeneration [J].Appl Therm Engin,2016,100:356-366.
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[6] LEE S J,JEONG S J,KIM W S.Numerical design of the diesel particulate filter for optimum thermal performances during regeneration [J].Appl Energ,2009,86(7/8):1124-1135.
[7] FU Jun,TANG Yuan,LI Jianxing,et al.Four kinds of the two-equation turbulence model's research on flow field simulation performance of DPF's porous media and swirl-type regeneration burner [J].Appl Therm Engin,2016,93:397-404.
[8] YU Mengting,DAN L,BALAKOTAIAH V.Analysis of ignition in a diesel particulate filter [J].Catal Today,2013,216:158-168.
[9] 梅德清,赵翔,陈鬃,等.柴油机颗粒物热重参数优化选择及其氧化特性研究 [J].内燃机工程,2015,36(6):20-26.
[10] 李帅帅,王学斌,刘梓晗,等.O2/CO2气氛下碳烟氧化的反应动力学研究 [J].动力工程学报,2017,37(8):673-678.
[11] 王楠.柴油机微粒捕集器流场及压降特性的数值模拟 [D].天津:天津大学,2016.
[12] 黄群锦.DPF灰分分布和非对称结构对其性能影响的研究 [D].天津:天津大学,2016.
[13] STANMORE B R,BRILHAC J F,GILOT P.The oxidation of soot:a review of experiments,mechanisms and models [J].Carbon,2001,39(15):2247-2268.
[2] ALIYU B,SHITANDA D,WALKER S,et al.Performance and exhaust emissions of a diesel engine fuelled with Croton megalocarpus (musine) methyl ester [J].Appl Therm Engin,2011,31(1):36-41.
[3] KNECHT W.Diesel engine development in view of reduced emission standards [J].Energy,2008,33(2):264-271.
[4] E Jiaqiang,ZUO Wei,GAO Junxu,et al.Effect analysis on pressure drop of the continuous regeneration-diesel particulate filter based on NO2 assisted regeneration [J].Appl Therm Engin,2016,100:356-366.
[5] KUWAHARA T,NISHII S,KUROKI T,et al.Complete regeneration characteristics of diesel particulate filter using ozone injection [J].Appl Energ,2013,111:652-656.
[6] LEE S J,JEONG S J,KIM W S.Numerical design of the diesel particulate filter for optimum thermal performances during regeneration [J].Appl Energ,2009,86(7/8):1124-1135.
[7] FU Jun,TANG Yuan,LI Jianxing,et al.Four kinds of the two-equation turbulence model's research on flow field simulation performance of DPF's porous media and swirl-type regeneration burner [J].Appl Therm Engin,2016,93:397-404.
[8] YU Mengting,DAN L,BALAKOTAIAH V.Analysis of ignition in a diesel particulate filter [J].Catal Today,2013,216:158-168.
[9] 梅德清,赵翔,陈鬃,等.柴油机颗粒物热重参数优化选择及其氧化特性研究 [J].内燃机工程,2015,36(6):20-26.
[10] 李帅帅,王学斌,刘梓晗,等.O2/CO2气氛下碳烟氧化的反应动力学研究 [J].动力工程学报,2017,37(8):673-678.
[11] 王楠.柴油机微粒捕集器流场及压降特性的数值模拟 [D].天津:天津大学,2016.
[12] 黄群锦.DPF灰分分布和非对称结构对其性能影响的研究 [D].天津:天津大学,2016.
[13] STANMORE B R,BRILHAC J F,GILOT P.The oxidation of soot:a review of experiments,mechanisms and models [J].Carbon,2001,39(15):2247-2268.