| 韩峰，王晓华，王意宝.双级尿素-选择性催化还原系统对柴油机排放特性的影响研究[J].内燃机工程,2019,40(3):41-45. |
| 双级尿素-选择性催化还原系统对柴油机排放特性的影响研究 |
| Influence of Two-Stage Urea-Selective Catalytic Reduction System on Performance and Emissions of Diesel Engine |
| DOI：10.13949/j.cnki.nrjgc.2019.03.006 |
| 关键词:双级尿素-选择性催化还原系统 国Ⅵ排放 闭环控制 国际统一瞬态循环（WHTC） 被动再生 |
| Key Words:two-stage urea selective catalytic reduction system China Ⅵ missions regulation closed-loop control world harmonized transient cycle(WHTC) passive regeneration |
| 基金项目: |
|
| 摘要点击次数: 3860 |
| 全文下载次数: 1718 |
| 摘要:为满足国Ⅵ排放标准，提出并开发了双级尿素（urea）-选择性催化还原（selective catalytic reduction system, SCR)系统及控制策略，并针对该系统在柴油机上的NOx排放特性及对柴油颗粒捕集器(DPF)被动再生的影响进行了台架验证。结果表明：冷态国际统一瞬态循环（WHTC）双级urea-SCR系统NOx转化效率达到89.2%，比单级urea-SCR系统提高了5.4%，冷起动NOx排放显著降低；热态WHTC双级urea-SCR系统NOx转化效率达到99.3%，比单级urea-SCR系统提高了3.0%；对双级urea-SCR系统尿素喷射量采用闭环控制策略，热态WHTC下DPF平衡点碳载量仅比单级urea-SCR系统提高了0.2 g/L，DPF被动再生效果几乎未受影响。 |
| Abstract:A two-stage urea-selective catalytic reduction(SCR) system and a related control strategy were developed as an alternative solution to fulfilling the China Ⅵ emissions regulation. Experiments were proceeded to validate the developed system performance in converting NOx and to investigate the influence of the new system on diesel particulate filter(DPF) passive regeneration. The results show that during the world harmonized transient cycle(WHTC) the efficiency of converting NOx by the new system reaches up to 89.2% at cold start and up to 99.3% at hot start, 5.4% and 3.0% respectively higher than those of the conventional system. The total WHTC emissions are lower than those of the China Ⅵ emissions regulation, which indicates the new system has the potential to satisfy the further emissions legislation. When a closed-loop control is adopted for the urea injection, the two-stage urea-SCR system has only 0.2 g/L higher soot loading than the conversional system at DPF balance point under WHTC cycle, exerting very limit influence on the DPF passive regeneration performance. |
|
查看全文 HTML
查看/发表评论 下载PDF阅读器 |