Low emission dual fuel engine and method of operating same
AssigneeCooper Industries, Inc.
InventorMelvin J. Helmich
Life of this patent
Estimating the term…
Abstract
A dual fuel engine system and method of operating the engine reduces emission rates of polutants. The dual fuel engine includes a fuel oil supply connected to the engine and a fuel gas supply connected to the engine. Means connected between the fuel oil supply and the engine inject low levels of diesel fuel into the engine. In particular, the injection of diesel fuel is limited to pilot injection quantities only. The exhaust emission of NOx is maintained at less than 1 GM/HP-HR, where natural gas is used as the primary fuel, and less than 0.5 GM/HP-HR where digester gas is used as the primary fuel.
Claims26
A low emission duel fuel engine system comprising:
- a dual fuel engine having a combustion chamber;
- a fuel oil supply connected to said engine;
- a fuel gas supply connected to said engine;
- and
- means connected between said fuel oil supply and said engine for injecting fuel oil into said engine, said means connected between said engine and fuel oil supply limiting the injection of fuel oil to the combustion chamber to pilot ignition quantities only, wherein said limiting means includes means for limiting the injection of fuel oil such that the exhaust emission of NOx is at an emission rate of less than 1 GM/PH-HR, whereby the exhaust emission performance of the dual fuel engine is enhanced.
A method of operating a dual fuel engine comprising:
- injecting fuel oil to said engine;
- supplying fuel gas into said engine;
- limiting the injection of fuel oil to said engine to pilot ignition quantities wherein an exhaust emission of NOx is limited to an emission rate of less than 1 GM/HP-HR, whereby the exhaust emission performance of the dual fuel engine is enhanced.
A combustion system for a dual fuel engine comprising:
- an engine;
- a fuel oil supply for said engine;
- a fuel gas supply for said engine;
- and
- means connected between said fuel oil supply and said engine for injection fuel into said engine, said means connected between said engine and said fuel oil supply limiting the injection of fuel oil to pilot ignition quantities only, wherein said limiting means includes means for limiting the injection of fuel oil such that the exhaust emission of NOx is at an emission rate of less than 1 GM/HP-HR, whereby the exhaust emission performance of the dual fuel engine is enhanced.
Dependencies are inferred from the claim text.