Though hydrogen fueled spark ignition engine can operate at high thermal efficiency with almost zero emission of HC and CO, the high level of NOx poses problems. The high combustion temperature and lean mixtures used are the reasons. In this work, the effect of N2, CO2 and hot EGR (exhaust gas recirculation) gas as diluents in the intake charge to suppress NO emission in a manifold injected hydrogen fueled SI engine was studied. Nitrogen as a diluent is not so effective at low loads while inducting smaller amounts, but very effective at higher loads where the mixture becomes richer and the dilution effect (oxygen depletion) is significant. On other hand, carbon dioxide is a good diluent with relatively better thermal effect and diluent effect and effectively controls NO emission at all output regions. However this is at the expense of thermal efficiency. Recirculating hot exhaust gas which contains both N2 and steam comes in between N2 and CO2 in terms of its effectiveness. On the whole N2 is the most effective as it has minimum impact on thermal efficiency for a given level of permissible NO emission. Thus it is felt that cold EGR could be a good option. In all cases, a good control system is necessary to supply correct quantity of diluent.
Intake charge dilution effects on control of nitric oxide emission in a hydrogen fueled SI engine
Verdünnungseffekte bei der Ansaugbeladung auf die Kontrolle der Stickoxidemissionen in wasserstoffangetriebenen Otto-Motoren
International Journal of Hydrogen Energy ; 32 , 12 ; 2043-2056
2007
14 Seiten, 34 Bilder, 2 Tabellen, 23 Quellen
Aufsatz (Zeitschrift)
Englisch
Engine Speed and Load Effects on Charge Dilution and Nitric Oxide Emission
SAE Technical Papers | 1972
|Why Intake Charge Dilution Decreases Nitric Oxide Emission from Spark Ignition Engines
SAE Technical Papers | 1971
|Effects of Charge Dilution on Nitric Oxide Emission from a Single-Cylinder Engine
SAE Technical Papers | 1971
|The effects of intake charge preheating on a gasoline-fueled HCCI engine
Kraftfahrwesen | 2005
|The Effects of Intake Charge Preheating in a Gasoline-Fueled HCCI Engine
SAE Technical Papers | 2005
|