Engine is very important part of an automobile. In present
time many research is going on engine to get maximum mileage and power at
minimum cost. An alternative fuel is also required to run an engine because higher
cost and low availability of petroleum fuel (diesel and petrol). Many engines
have developed which can run on an alternative fuel; one of them is a dual fuel
engine. CNG and LPG fuel engines which are used in now days are dual fuel
engine. Dual fuel engine are used because of high cost of diesel.
Working of dual fuel engine:
Dual fuel engine is a compression ignition engine. According
to its name, it used two fuels to complete a power stroke. It is used gaseous
fuel as the main fuel and diesel fuel as pilot fuel. In these engines, mixture
of gaseous fuel and air is drawn into the engine cylinder. In the cylinder this
mixture compressed. A big problem occur to ignite this mixture because of
gaseous fuels are not a good compression ignition fuel. So a small quantity of
diesel oil is injected into the compressed mixture. As same as the diesel
engine, this diesel fuel ignites due to temperature rise in compression. This
fuel is known as pilot fuel. This ignites the whole mixture of air and gaseous
fuel and a rapid combustion take place inside the cylinder. This combustion
increase pressure inside the cylinder which force the piston same as other
engine and produce power.
In a dual fuel engine, pressure rises suddenly
which can generate knocking problem. So a predefine quantity of pilot fuel is
injected. If we inject large quantity of pilot fuel it ignites the mixture
rapidly and makes the cause of knocking.
how to convert a diesel engine into dual fuel engine?
The
design of the dual fuel engine is same as the diesel engine except in dual fuel
engine the air is mixed with the gaseous fuel in inlet manifold and small
quantity of diesel engine is injected into cylinder chamber by injector. To
store and inject diesel fuel a pump and a tank assembly is also used in dual
fuel dual. By these changes we can convert any engine into dual fuel engine.
Advantages of dual fuel engine:
1. A dual fuel engine can run on both diesel fuel and gaseous
fuel.
2. It is used gaseous fuels, which are cheap and easily
available.
3. It is used gaseous fuels which are free from pollution. So it
is environment friendly engine.
4. Because of clean combustion, it reduces wear and tear in
engine and also requirement of lubricating oil.
6. These engines are very suitable for LPG and CNG.
7. It generates high power than diesel fuel at higher load
conditions.
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