欢迎访问《汽车安全与节能学报》，
汽车安全与节能学报

JASE ›› 2018, Vol. 9 ›› Issue (3): 317-324.DOI: 10.3969/j.issn.1674-8484.2018.03.011

• 汽车节能与环保 • 上一篇    下一篇

CO2 浓度和排气温度对LNT 吸附路径的影响

李志军1,2，曹丽娟1，帅石金2，申博玺1，刘世宇2，朱伶雅1，吴 越1   

  1. （1. 天津大学，内燃机燃烧学国家重点实验室，天津 300072 ；2. 清华大学，汽车安全与节能国家重点实验室，北京 100084）
  • 出版日期:2018-09-30 发布日期:2018-10-08
  • 作者简介:李志军（1962—），男（汉），河北，教授。E-mail: zhijunli@tju.edu.cn。
  • 基金资助:

    清华大学汽车安全与节能国家重点实验室开放基金资助项目(KF1818）；国家自然科学基金资助项目 (51576140)。

Influence of CO2 concentration and exhaust temperature on adsorption path of LNT

LI Zhijun1, 2, CAO Lijuan1, SHUAI Shijin2, SHEN Boxi1, LIU Shiyu , ZHU Lingya1, WU Yue1   

  1. (1. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China; 2. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China)
  • Online:2018-09-30 Published:2018-10-08

PDF

300

摘要：

        为了研究稀燃汽油机在150~400 ℃范围内排气中CO2 浓度和温度对吸附路径的影响，改写了稀燃NOx 捕集器（LNT）相关的气相、表面相和热力学文件，运用Chemkin 软件建立了包含硝酸盐和亚硝酸盐两种吸附路径的LNT 模型。研究结果表明：CO2 对两种吸附路径均有影响，对亚硝酸盐路径的抑制作用强于对硝酸盐路径的影响，但随CO2 浓度增加，抑制作用逐渐减弱；排气温度比CO2 浓度对两种路径有更显著的影响；在150~200 ℃低温区，NO 的氧化和亚硝酸盐的进一步转化均受阻，故亚硝酸盐路径主导；在高温区300 ℃和400 ℃时，两种路径占有率相似。

关键词: 稀燃汽油机, 稀燃NOx 捕集器（LNT）, 二氧化碳(CO2) , 温度, 吸附路径

Abstract:

The gas file, surface file and thermal file of LNT in Chemkin were rewritten, and the adsorption model of lean NOx trap (LNT) , which included two kinds of adsorption paths, was developed to investigate the influence of CO2 concentration and temperature of lean burn gasoline exhaust on the adsorption path from
150 to 400 ℃ . The main research results show that the presence of CO2 has influence on the both paths, and CO2 has more inhibition on nitrite path than nitrate path. With the concentration of CO2 increasing, the effect of inhibition weakens. The influence of exhaust temperature on both of the paths is more significant. During low temperature 150-200 ℃ , nitrite path is major path because of the inactivation of nitrite evolution and NO oxidation. While at the high temperatures of 300 ℃ and 400 ℃ , two paths have similar occupancy

Key words: lean burn gasoline, lean NOx trap (LNT), carbon dioxide (CO2), temperature, adsorption path.