Dual Fuel Engine Conversion JFE Engineering Corporation 18 May 2010

Engine Cycle <Diesel Mode> <Dual Fuel Mode> Gas Admission Pilot Injection Gas Admission Intake Compression Combustion <Diesel Mode> Advantages : DF engines can operate at 100% load using only diesel oil in case of need Intake Compression Combustion Fuel gas : 95% Fuel oil : 5% <Dual Fuel Mode>

Features of Dual Fuel Engine Less operation cost → Main fuel : Natural Gas Environmental friendly → Drastic reduction of NOx, SOx & CO2 emission Stable operation → Pilot injection system → Operatable on either fuel of natural gas or diesel oil Excellent dependability → Main component : Diesel engine Clean combustion and Less maintenance cost Effective utilization of existing assets

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)

What we do? Converting diesel engine power plants to dual fueled engine power plant Present Main Fuel … [Diesel Oil] “ Diesel ” Engine After conversion Main Fuel …[Natural Gas] Pilot Fuel…[Diesel Oil] “ Dual Fuel ” Engine

Dual Fuel Engine Conversion Before Conversion After Conversion Exhaust System Air/Gas Intake System Fuel Injection System Cylinder Head Piston Connecting Rod Typical samples of the Dual Fuel Engine (Carburetor Type)

Major Modified Engine Parts and Auxiliaries for Conversion Engines parts <additional parts> 　- Gas admission system, knock detector - Air/Fuel ratio control system - Oil mist ventilation system <Specification change parts> - Piston ring, Piston pin metal - Fuel injector, Plunger assembly, Fuel governor <Modification parts> - Cylinder head, Piston, Liner, Charge air duct, T/C matching Plant Auxiliaries - Gas supplying system - Safety device for gas system - Engine control panel - Remote monitoring system

Schematic Diagram for DF System <New Installing Part for Conversion> IDO Tank Shut off Valve Gas Press. Regulating Valve S Gas Pump Air Filter FO Injection Pump Air Exhaust Gas Rev. Pick up Valve Controller Turbocharger Cam Governor DO Injector A Gas Admission Valve Air Cooler Charged Air A To Turbocharger Water Main Controller （Fuel, Gas） Piston