This ppt will help you to know about the concepts of Dual-Fuel Engine ,it's advantages ,working procedure etc.

1. COLLEGE OF ENGINEERING ROORKEE
SUBMITTED BY :-
AYUSH SAXENA
Dual Fuel Engine
Guided by:-
Amit singh

2. OVERVIEW OF PRESENTATION
• Introduction
• Working Principle.
• Dual-Fuel Operation
• Factors Affecting Performance in DualFuel Engine.
• Performance of Dual-Fuel Engine
• Advantages of Dual-Fuel Engine

3. INTRODUCTION TO DUAL FUEL ENGINE
• The dual-fuel engine works on diesel cycle. The gaseous fuel (the primary
fuel) is added to the air inducted by the engine or supplied by the
supercharger at a pressure slightly above the atmospheric pressure. This
mixture of air and gaseous fuel is compressed in the cylinder just like air in
normal diesel operation.
• At some point in the compression stroke, near top dead center, a small
charge of liquid fuel called pilot fuel (or the secondary fuel) is injected
through a conventional diesel fuel system. This pilot acts as a source of
ignition the gas-air mixture in the vicinity of the injected spray ignites at a
number of flame-fronts. Thus combustion stars smoothly and rapidly

4. WHAT IS DUAL FUEL ENGINE?
In CI engine, gaseous fuel (secondary fuel) is inducted and
compressed in the engine cylinder with air, and a small
quantity of diesel ( Pilot fuel- primary fuel) is injected through
the conventional diesel fuel system to ignite the mixture

5. WHY DUAL FUEL ENGINE REQUIRED ?
• The shortage of liquid fuel and the realization that gaseous fuels are far
cheaper than liquid fuels have led to attention on dual-fuel engine.
• natural gas available to most of part of the world at rates cheaper than
liquid fuels

6. DUAL FUEL ENGINE WORKING
•

7. DUAL-FUEL OPERATION
• Dual-fuel operation is achieved by the
burning of both a gaseous fuel and diesel
at the same time in a CI engine
• Injection of small amount of diesel fuel can
be used as an ignition source

8. FACTORS AFFECTING COMBUSTION IN A DUAL-
FUEL ENGINE
• Pilot fuel quantity
• Injection Timing.
• Cetane Number of Pilot Fuel.
• Inlet Temperature.
• Gaseous Fuels.
• Effect of Throttling.
• Mixture Strength

9. KNOCK AND ITS CONTROL IN DUAL-FUEL ENGINE
NATURE OF KNOCK: - The phenomenon of knock in a dual-fuel engine is of the nature of auto ignition of
gaseous mixture in the neighbourhood of injected spray.
KNOCKINDUAL-FUEL ENGINE CONTROLLEDBYANY OFTHEFOLLOWINGMETHODS:-
• Excess supply of air.
• Use of cold combustion air.
• Increased cooling of piston.
• Reducing the pressure of the gaseous fuel.

10. ADVANTAGE OF DUAL- FUEL ENGINE
• The gas burns without leaving any residue - exhaust is clean – less
air pollution.
• Lower initial cost and lower operating costs than a dedicated natural
gas engine
• Better fuel economy than a dedicated natural gas engine
• Lower maintenance costs than a dedicated natural gas engine

11. CONCLUSION
• The ignition delay in gas-fueled diesel engines of the dual-fuel type
depends strongly on both the quantity and quality of the pilot fuel used.
• Dual-fuel engine performance is improved with the employment of high
cetane number pilots.
• For stationary application, diesel substitution of 70% is possible by using dual
fuel engine which is quite considerable and also economical

12. THANK YOU