Patent ID: 8850803
Filing Date: 2014-10-07
Classification: F01N,Y02T

Abstract:
1. An auxiliary power and emission-control system using gaseous fuel recovery, comprising: a cryogenic gaseous fuel storage tank for containing a gaseous fuel, the tank having a vent; a main engine that operates using the gaseous fuel; a primary gaseous fuel supply system for supplying the gaseous fuel from the tank to the main engine; an auxiliary engine that operates using the gaseous fuel, the auxiliary engine providing power to at least one auxiliary component of the auxiliary power and emission-control system; a secondary gaseous fuel supply system for supplying the gaseous fuel from the vent to the auxiliary engine; a first exhaust passage for receiving a first stream of exhaust gas from the main engine; a second exhaust passage for receiving a second stream of exhaust gas from the auxiliary engine; an ammonia-producing catalyst disposed along the second exhaust passage for treating the second stream of exhaust gas from the auxiliary engine; a third exhaust passage fluidly connected to the first and second exhaust passages, the third exhaust passage for routing the first and second exhaust gas streams; a NOx reducing catalyst disposed along the third exhaust passage for treating the first and second streams of exhaust gas; wherein the auxiliary power and emission-control system is configured to operate such that the second exhaust gas stream generates a mass flow of ammonia that substantially matches a total mass flow of NOx gas in the third exhaust passage that is treated by the NOx reducing catalyst.