WHAT IS DUAL FUELLING

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In simple terms Dual Fuel is simultaneous combustion of two fuels; methane based gaseous fuel is utilized in conjunction with diesel fuel to operate the engine. After conversion, the engine is able to operate on either 100% diesel fuel, or alternatively, on a mixture of diesel fuel and methane based fuels. At no time is the engine able to operate on gaseous fuels exclusively.

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During Dual Fuel operation, a reduced quantity of diesel fuel acts as the ignition source for the air-gas mixture. Dual Fuel System replaces diesel fuel with equivalent heat energy of the methane based fuels.

THE TECHNOLOGY

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Dual Fuelling System is an innovative retrofit technology that allows liquid fired engines to operate on a mixture of liquid fuel and Natural Gas. This is achieved through the use of technologies that are installed externally of the engine.

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The system requires precise regulation and control of the fuel supply gas. The Dual Fuel System is supplied with a “gas train” consisting of gas filter, zero pressure gas regulator and electrically activated gas solenoid valve. The gas train is designed to accept low pressure gas and supply regulated gas to the engine at slightly negative pressure.

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Dual Fuel System delivers Natural Gas to the cylinders via Air-Gas Mixer located in the standard engine air-intake system. The Gas is then ignited by a diesel “pilot” that acts as an ignition source for the air-gas mixture.

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The State-Of-The-Art controller monitors critical engine and Dual-Fuel System parameters and activates/ deactivates gas mode according to programmed limits. It provides safety to the engine while operating in the Dual-fuel mode.

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Conversion allows the engine to operate on gas mixtures ranging from 50% to 70% + of total fuel consumed. Engines converted to Dual-fuel exhibit diesel-like performance in critical areas as efficiency, stability and load acceptance.

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The compatible Fuel Gases are - Pipeline natural gas (PNG); Coal-bed Methane (CBM); Compressed natural gas (CNG); Bio-gas (landfill, wastewater); Liquefied natural gas (LNG); Well-head gas.

SYSTEM CHARACTERISTICS

SYSTEM ADVANTAGES

Non intrusive simple construction
Available for different sized high or low speed engines
Safe engine operation by continuous monitoring of
Exhaust Gas Temperature
Engine Knock
Institutes Fuel Flexibility – the engine continues to run, even if no gas is available, on 100% liquid fuel.
Seamless switching from (Gas + Liquid) to (liquid) fuel and vice versa.
No loss of power
Existing assets can be used for generating power economically
Low Capital cost
Rapid paybacks
Few moving components and hence low maintenance cost
Use of cleaner fuel – improves emissions.

SYSTEM LAYOUT