原文传递
Clarifies March diesel engines story
| 题名： | Clarifies March diesel engines story |
| 正文语种： | eng |
| 作者： | John Fischer |
| 摘要： | A little clarification regarding the March article "Power Supply." The SCR (selective catalytic reduction) is actually a complete package of components that doesn't "remove" NOx (nitrogen oxide) from the exhaust but rather initiates a chemical reaction that converts NOx into harmless nitrogen and water by way of the additional fluid injected into the exhaust. Conversion rates of 90%-plus are achieved in some current applications, and an engine doesn't "lose power" as this fluid reducing agent, DEF (diesel exhaust fluid), is diminished. Rather an engine can be programmed - most frequently because of an emissions law requirement in effect - to operate at a reduced power level, necessitating that an operator expediently get the onboard DEF level back up to a usable level. The point being of course that an operator cannot continue to operate an engine with no DEF being used, thereby generating excessive emissions. |
| 出版年： | 2021 |
| 期刊名称： | Work Boat |
| 卷： | 78 |
| 期： | 6 |
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