Low emission power plant and method of making same

F - Mech Eng,Light,Heat,Weapons – 02 – B

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F02B 75/02 (2006.01) F02B 3/06 (2006.01) F02B 25/04 (2006.01) F02B 25/14 (2006.01) F02B 33/36 (2006.01) F02B 47/08 (2006.01) F02B 75/10 (2006.01) F02M 25/07 (2006.01)

Patent

CA 2267267

A low emission power generating apparatus which comprises a modified two- stroke diesel engine component (12) and modified turbocharger component (14) which has a relatively low aspect ratio. The diesel engine component (12) is a modification of a conventional two-stroke diesel engine design and includes an exhaust valve cam of unique design that has a cam profile which results in a later-than-normal exhaust valve (24) opening and an earlier-than-normal valve closing so that the time during which the exhaust valve (24) remains open is shorter than normal, thereby causing a substantially greater volume of residual gases to remain in the combustion chamber (18) following the scavenge stroke. Reduction in peak combustion temperature advantageously results in the lower than normal production of nitrogen oxide and, therefore, allows advancement of the injection timing, while still maintaining the NOx emissions coming form the engine lower than those legislatively mandated. The modified turbocharger component (14) provides an additional charge of oxygen-rich air into the combustion chamber (18).

La présente invention concerne un appareil de génération de puissance à faible émission, lequel comprend un composant moteur diesel à deux temps (12) et un composant turbocompresseur modifié (14) présentant un rapport de forme relativement faible. Le composant moteur diesel (12) est un modèle de moteur diesel à deux temps classique modifié et il comprend une came de soupape d'échappement de conception unique, came dont le profil permet l'ouverture retardée et la fermeture précoce de la soupape d'échappement (24), de manière que le temps pendant lequel la soupape d'échappement (24) reste ouverte est raccourci par rapport à la normale, ce qui fait qu'un volume sensiblement plus important de gaz résiduels reste dans la chambre de combustion (18) après la course de balayage. La réduction de la température de combustion diminue avantageusement la production d'oxyde d'azote et permet, par conséquent, d'accélérer l'avance à l'injection tout en maintenant les émissions de NOx provenant du moteur sous le seuil légalement autorisé. Le composant turbocompresseur modifié (14) introduit une charge supplémentaire d'air riche en oxygène dans la chambre de combustion (18).

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