Technical Advantages of Urea SCR for Light-Duty and Heavy-Duty Diesel Vehicle Applications
Technical Advantages of Urea SCR for Light-Duty and Heavy-Duty Diesel Vehicle Applications
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尿素 SCR 在轻型和重型柴油车应用中的技术优势
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
C. Sharp
中科院分区：
文献类型：
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作者：
C. Lambert;R. Hammerle;R. McGill;M. Khair;C. Sharp
2007年轻型和重型柴油车的排放标准仍然是一个挑战。要达到标准，氮氧化物转化率必须达到90%左右。在柴油废气的低温下，最有可能实现高NOx转化率的技术是贫氮氧化物捕集器（LNTs）和使用含水尿素的NOx选择性催化还原（SCR），通常称为尿素SCR。LNT的优点是不需要新的基础设施，也不会产生任何新的客户遵从性问题。然而，尿素SCR在更宽的温度窗口内具有高且持久的氮氧化物转化率，更低的等效燃料惩罚，以及更低的系统成本。在技术基础上，尿素SCR最有可能达到2007年氮氧化物排放目标。本文综述了一些轻型和重型应用的示范方案的结果。
The 2007 emission standards for both light-duty and heavy-duty diesel vehicles remain a challenge. A level of about 90% NOx conversion is required to meet the standards. Technologies that have the most potential to achieve very high NOx conversion at low temperatures of diesel exhaust are lean NOx traps (LNTs) and Selective Catalytic Reduction (SCR) of NOx using aqueous urea, typically known as Urea SCR. The LNT has the advantage of requiring no new infrastructure, and does not pose any new customer compliance issues. However, Urea SCR has high and durable NOx conversion in a wider temperature window, a lower equivalent fuel penalty, and lower system cost. On a technical basis, Urea SCR has the best chance of meeting the 2007 NOx targets. This paper reviews the results of some demonstration programs for both light-and heavy-duty applications.