Dual Fuel Engines

Dual Fuel Engines

Abstract

The possibility of substituting cleaner burning alternative fuels for automotive service has drawn increasing attention during the last decade. Cater- Pillar developed its patented dual fuel technology using natural gas & diesel fuel simultaneously. Performance like diesel is maintained while providing truck fleets, the unique benefits of lower cost & low emissions.

Standard Caterpillar engines are fitted with dual fuel electronic control that monitors and control natural gas fuel diesel is used as the ignition source instead of spark plug. Hence, these engines are also called as “LIQUID SPARK PLUG ENGINES”. Dual fuel engine can operate on diesel fuel in emergencies and the engine can be reconfigured to its original state.

Dual fuel engines are capable of producing as much power when running with a gaseous fuel as a primary fuel as when operating liquid fuel only. Dual fuel engine is slightly superior to the conventional diesel at full load this is because of fact that the gaseous fuel fills all parts of the combustion chamber and allows more air to be burned. The main advantages of duel fuel engines is the gas burns without leaving any residue and the exhaust is clean this has a great importance in view of increasing emphasis of prevention of air pollution.

INTRODUCTION

Because of the nation’s concern about energy security and air pollution, the clear Air Act Amendments, which have forced broad changes in fuel and vehicle Reformulated gasoline, clean diesel, and alternative fuel are receiving wide attention as industry works to comply with the acts. The U.S. Department of energy (DOE) identified the development of a Next generation Natural gas vehicle as a strategic element in its program to reduce oil import and vehicle pollutants.

Dual-fuel natural gas engine retain the diesel compression ratio of over 16:1.The air and gas mixture is ignited by a small charge of diesel fuel that is injected directly into the cylinder. The Dual-fuel engine provides the low-NOx emission of a spark ignited lean-burn natural gas engine with the high efficiency & power output of a diesel engine. The base Cater Pillar C-12 Dual fuel engine is rated at 410 hp and 2250 ft-1b of peak torque. It has been widely used as a prime move on heavy (class-8) CNG vehicle that meet California low NOX emission standards.

CAP’s Dual-Fuel engine have been certified to California low NOx emission levels since 1997. The emission reduction techniques used are essentially the same for all three sizes of Dual-Fuel engines (7,10and 12 L). The C-12 Dual Fuel engine equipped with further improved state of the art combustion and after treatment equipment & strategies was demonstrated.

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