Measurement of soot oxidation with No<Subscript>2</Subscript>-O<Subscript>2</Subscript>-H<Subscript>2</Subscript>O in a flow reactor simulating diesel engine DPF

Understanding the mechanism of carbon oxidation is important for the successful modeling of diesel particulate filter regeneration. Characteristics of soot oxidation were investigated with carbon black (Printex-U). A flow reactor system that could simulate the condition of a diesel particulate filter and diesel exhaust gas was designed. Kinetic constants were derived and the reaction mechanisms were proposed using the experimental results and a simple reaction scheme, which approximated the overall oxidation process in TPO as well as CTO. From the experiments, the apparent activation energy for carbon oxidation with NO₂-O₂-H₂O was determined to be 40±2 kJ/mol, with the first order of carbon in the range of 10∼90% oxidation and a temperature range of 250∼500°C. This value was exceedingly lower than the activation energy of NO₂-O₂ oxidation, which was 60±3 kJ/mol. When NO₂ exists with O₂ and H₂O, the reaction rate increases in proportion to NO₂. It increases nonlinearly with O₂ or H₂O concentration when the other two oxidants are fixed.     

一汽“狂飙”

一汽人通过提升管理、加快产出,扩大销量,强化自主,扩大合作等一系列工作,赢得企业又好又快地新发展,使集团的销量、销售收入和利润登上历史的新巅峰。     

<TPL-PCRUN> Statement of methods

TPL-PCRUN is a software program for the dynamic interaction simulation of pantograph–catenary systems. In the benchmark, based on the finite element method, the catenary model was built and the pantograph was considered as a three-level spring–damper–mass system. Then, through the contact definition between pantograph and catenary, the coupled model of the pantograph and catenary system was established. The respective dynamic equations of motions were solved by the time integration method. Thus, the simulation results were obtained and submitted for the comparison with the other software. On the other hand, a standard model from EN50318 was established and analysed by TPL-PCRUN. The simulation results by TPL-PCRUN were remarkably consistent with the reference values given by EN50318. It was proved that the results by TPL-PCRUN can be reliable. Recently, the software has been updated and improved. Some new models and algorithms are proposed, including the rigid–flexible hybrid pantograph model, contact definition considering appearance characteristics of the contact surfaces, a fluid–solid coupling algorithm of the pantograph and catenary system, etc.     

汪玉春论“道”

当岁月将沧桑慢慢抹上他的额头与鬓角时,他的思想却日见成熟和丰满起来。对质量成本的密切关注,使得他成为了业内截至目前少有的精益推动者之一。     

Study of n-C<Subscript>12</Subscript>H<Subscript>26</Subscript> reforming over DFC catalyst in a simulated diesel exhaust

In lean-DeNOX catalysis reactions, hydrogen is a good reducing agent in PGM catalysts as well as an effective promoter in selective catalytic reduction reactions over base metal oxide catalysts. However, such a lean-DeNOX system, which uses hydrogen, requires an on-board fuel reforming system applicable to internal combustion engines. In this study, catalytic partial oxidation (CPOx) performance was tested in a laboratory for various reactants and hydrocarbon conditions. Volume concentrations of 5–10% oxygen and 0-5% water vapor were used to simulate diesel exhaust, and n-C₁₂H₂₆ was used as the feedstock for the reforming reaction. In the CPOx of n-C₁₂H₂₆, the highest hydrogen selectivity was 64% and was achieved at 100,000 h-1 GHSV. Additionally, the C/O ratio was less than unity in the absence of water vapor. However, as the water concentration was increased to 2.5 and 5.0 vol. % in the n-C₁₂H₂₆ CPOx reactions, the maximum hydrogen selectivity was increased from 64% in the absence of water to 70% and 75%, respectively. This effect is a consequence of the water-gas shift reaction over the catalyst bed. Regarding oxygen concentration effects, hydrogen selectivity slightly increased with increasing oxygen concentration from 10% to 15%. It was also found that the CPOx reaction of n-C₁₂H₂₆ can be ignited at temperatures below 300 C. Accordingly, it can be concluded that CPOx is a useful and feasible device for promoting diesel DeNOx catalysis in terms of hydrogen productivity and reaction initiation.     

江腾一 茶道·车道·人间道

<正>19981998年,13岁的江腾一发现了自身具备的赛车手潜质,于是他开始了自己的卡丁车生涯,在当时他就已经被预言会成为一名成功的天才车手。20032003年,江腾一有幸参加丰田车队及PREMA POWER的雷诺方程式车队在意大利的试车,整个过程中他的表现让人惊喜,出乎所有技术人员的意料,本次试车的所有技术指数表明他是一个很有潜能和可造就的年轻车手。20072007年3月4日,江腾一同冠军方程式签约。次日,他飞往美国寻找自己的赛车之"道"。     

他送“猛士”上战场——记东风汽车公司“猛士”总设计师黄松

2007年底,一款名为"猛士"的军用越野车正式装备部队,从此,中国有了堪与闻名于世的美国"悍马"相媲美的高性能军用越野车。该车的总设计师黄松成为公众关注的焦点。     

夺目双雄——三菱新型“Concept-RA”概念车与“Lancer Ralliart(蓝瑟)”

作为展示三菱汽车高新科技含量的载体,"Concept-RA"概念车以及"Lancer Ralliart (蓝瑟)"车,在动态的流线造型中将其中所蕴含的跑车理念与精益精神,淋漓尽致地展现在了世人面前。     

中国汽车“玲珑秀”

随着全球经济的高速发展,能源和环境问题日益突出,节约能源、保护环境已成为世界各国共同面临的重大挑战。利用电动自行车的产业优势,发展以电动微型车为主体的"个人轿车"非常符合中国国情。     

“毛主席”来到北京车展

作为外形酷似毛泽东主席的特型人物,他在北京国际汽车展上受到了观众热情关注,无论他走到哪里,都有许多观众要求和他合影留念……     

东风本田“绿色价值观”

诸多新技术、新系统的使用,使高品质、高效率的"绿色工厂"得以实现,充分体现出东风本田对社会、对未来的责任感和使命感。     

新能源汽车“路径”之争

面对全球石油短缺、污染排放法规不断严格的挑战,中国汽车产业如何实现以动力电气化、能源多元化为核心的技术升级,这是摆在中国汽车产业面前一个现实而紧迫的重大方向问题。     

克莱斯勒“漫步者”三姊妹

1PT漫步者轿车(PT Cruiser) 鉴于2001款克莱斯勒PT漫步者在技术工艺,设计和创新方面的突出表现,"大众机械师"(Popu1ar Mechanics)杂志将设计和工艺奖颁给戴姆勒克莱斯勒公司.     

客车自主品牌看“荣威”

由荣威的成功,笔者想到了客车自主品牌建设。客车自主品牌有着与乘用车不同的市场环境和生存空间,但是,我们还是可以从中得到一些启示。     

世界汽车工业界的“成本杀手”们

目前汽车工业界的许多大型跨国企业集团越来越喜欢聘用新人物担任总裁之要职,这些人通常被称为"成本杀手".究竟是哪些人享有这一美称?他们是怎样运作的?他们降低成本是为了消费者还是股东的利益?     

星锐聚焦主力市场

<正>虽然各种调整花费了江淮星锐的大量时间,但"磨刀不误砍柴工",在这一过程中,星锐逐步找到了自身突破的方向,那就是应用于城市物流的短轴宽体轻客市场。经过前期一系列的调整,蛰伏数月的江淮星锐2015年8月16日在杭州启动了星锐"绿驰行动",发布4系旗舰产品——星锐节油王。这款专门针对短     

怎样给汽车保"暖"?

1.发动机要加注专门的冷却液 　　据统计,冷却系统故障是导致发动机故障的头号杀手,占到故障总数的60%,而冷却媒介的使用直接关系到冷却系统能否正常运作.冬季发动机必须加注专门的冷却液. 　　……     

“蓝海战略”是轻卡动力的前路

就中国轻型商用车动力而言,其蓝海的概念就是避开现在竞争的焦点和误区,开发、引导盲区,研发核心竞争力,增强领先能力,放开眼界,拓宽领域,打开蕴涵庞大需求的市场空间。     

智能公交场站 省下“看不见的成本”

<正>上南公交智能公交场站主要包括3大功能中心:多功能调派中心、集群调度中心、值班中心,占地1万7 163 m2,可同时容纳70辆双电新能源车辆,集停放、充电、维修、管理于一体。众所周知,纯电动车由于采用电能驱动,其运营成本与传统汽车相比较低。但是,仅从能耗的角度分析是不够的,纯电动车还有很多隐性成本被大家所忽视,例如停车管理就是其