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- 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