Exhaust system for dual fuel engines

摘要

Exhaust system for a dual-fuel engine that is provided with a first fuel and a second fuel. The exhaust system includes an exhaust passageway, with an exhaust treatment component provided in the exhaust passageway. A thermal enhancement device communicates with the exhaust passageway and is located upstream from the exhaust treatment component, wherein the thermal enhancement device is operable to raise a temperature of an exhaust located in the exhaust passageway during a switch between the first fuel and the second fuel that is provided to the dual-fuel engine. The exhaust treatment system can also include a by-pass pipe in communication with the exhaust passageway that by-passes the exhaust treatment component, wherein during combustion of the first fuel by the dual-fuel engine, the by-pass pipe is open. During combustion of the second fuel by the dual-fuel engine, the by-pass pipe is closed.

主权项

1. An exhaust after-treatment system for treating exhaust produced by a dual-fuel engine that is operable to combust first and second fuels, comprising:
an exhaust passageway; an exhaust treatment component located in the exhaust passageway; a by-pass pipe in communication with the exhaust passageway through a valve, and configured to by-pass the exhaust treatment component; and a bleed passage in communication between the exhaust passageway and the by-pass pipe; wherein, during combustion of the first fuel by the dual-fuel engine, the valve opens the by-pass pipe and closes communication with the exhaust treatment component; and during combustion of the second fuel by the dual-fuel engine, the valve closes the by-pass pipe and opens communication with the exhaust treatment component to cause the exhaust to pass through the exhaust treatment component.