1. Dual Fuel Engine Conversion
JFE Engineering Corporation
18 May 2010

2. 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>

3. 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

4. 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)

5. 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

6. 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)

7. 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

8. 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