Dual Fuel Engine Conversion

JFE Engineering Corporation

18 May 2010

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Engine Cycle

Intake Compression Combustion

Intake Compression Combustion

<Diesel Mode>

<Dual Fuel Mode>

Gas Admission

Pilot Injection

Advantages :

DF engines can operate at 100% load using only diesel oil in case of need

Fuel gas : 95%

Fuel oil : 5%

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Features of Dual Fuel Engine

Less operation costLess operation cost → → Main fuel : Natural GasMain fuel : Natural Gas Environmental friendlyEnvironmental friendly → → Drastic reduction of NOx, SOx & CODrastic reduction of NOx, SOx & CO22 emission emission Stable operationStable operation → → Pilot injection systemPilot injection system → → Operatable on either fuel of natural gas or diesel oilOperatable on either fuel of natural gas or diesel oil Excellent dependabilityExcellent dependability → → Main component : Diesel engine Main component : Diesel engine Clean combustion and Less maintenance costClean combustion and Less maintenance costEffective utilization of existing assetsEffective utilization of existing assets

Less operation costLess operation cost → → Main fuel : Natural GasMain fuel : Natural Gas Environmental friendlyEnvironmental friendly → → Drastic reduction of NOx, SOx & CODrastic reduction of NOx, SOx & CO22 emission emission Stable operationStable operation → → Pilot injection systemPilot injection system → → Operatable on either fuel of natural gas or diesel oilOperatable on either fuel of natural gas or diesel oil Excellent dependabilityExcellent dependability → → Main component : Diesel engine Main component : Diesel engine Clean combustion and Less maintenance costClean combustion and Less maintenance costEffective utilization of existing assetsEffective utilization of existing assets

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Reductions

Operation Cost 　 Approx. 30% less *Reduction in Operation Cost will fluctuate because of the operation conditions of

engines and the price level of fuel oil and natural gas in a project site.

CO2 Emission 30% less SOx Emission 95% less NOx Emission 20% less 　　　　　　　　　　　　　　　　　　　 (comparing with

diesel oil firing)

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Dual Fuel Engine Conversion

Typical samples of theDual Fuel Engine(Carburetor Type)

Exhaust SystemExhaust System

Air/Gas Intake System

Air/Gas Intake System

Fuel InjectionSystem

Fuel InjectionSystem

Cylinder HeadPistonConnecting Rod

Cylinder HeadPistonConnecting Rod

Before ConversionBefore Conversion After ConversionAfter Conversion

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Major Modified Engine Parts and Auxiliaries for Conversion

Engines partsEngines parts<additional parts><additional parts>　　 - Gas admission system, knock detector- Gas admission system, knock detector - Air/Fuel ratio control system- Air/Fuel ratio control system - Oil mist ventilation system- Oil mist ventilation system<Specification change parts><Specification change parts> - Piston ring, Piston pin metal- Piston ring, Piston pin metal - Fuel injector, Plunger assembly, Fuel governor- Fuel injector, Plunger assembly, Fuel governor<Modification parts><Modification parts> - Cylinder head, Piston, Liner, Charge air duct, T/C matching- Cylinder head, Piston, Liner, Charge air duct, T/C matching

Engines partsEngines parts<additional parts><additional parts>　　 - Gas admission system, knock detector- Gas admission system, knock detector - Air/Fuel ratio control system- Air/Fuel ratio control system - Oil mist ventilation system- Oil mist ventilation system<Specification change parts><Specification change parts> - Piston ring, Piston pin metal- Piston ring, Piston pin metal - Fuel injector, Plunger assembly, Fuel governor- Fuel injector, Plunger assembly, Fuel governor<Modification parts><Modification parts> - Cylinder head, Piston, Liner, Charge air duct, T/C matching- Cylinder head, Piston, Liner, Charge air duct, T/C matching

Plant AuxiliariesPlant Auxiliaries - Gas supplying system- Gas supplying system - Safety device for gas system- Safety device for gas system - Engine control panel - Engine control panel - Remote monitoring system- Remote monitoring system

Plant AuxiliariesPlant Auxiliaries - Gas supplying system- Gas supplying system - Safety device for gas system- Safety device for gas system - Engine control panel - Engine control panel - Remote monitoring system- Remote monitoring system

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Schematic Diagram for DF System

A

Main Controller（ Fuel, Gas ）

S

Charged Air

Turbocharger

Air

Air Filter

Water

Air Cooler

Exhaust Gas

Gas Admission Valve

ValveController

Rev. Pick up

Shut off Valve

Gas

Gas Press. Regulating Valve

IDO Tank

Pump

FO Injection Pump

Cam

A

Piston

DO Injector

Governor

<New Installing Part for Conversion>

To Turbocharger