Boiler.
(1) Gasoline engine.
(a) A gasoline engine produces power through what is essentially a controlled explosion.
(b) A mixture of fuel and air is injected into a chamber (piston cylinder), compressed by the
piston, and ignited by a spark plug.
(c) The raising and lowering of the piston is what generates power to drive an axle.
(d) Gasoline engines require a fuel with a lower flash point than fuels used in diesel engines to
ensure that e fuel will ignite when the spark is applied.
(2) Diesel engine:
(a) The diesel engine uses the same theory of controlled explosions, pistons, and cylinder to
produce power. The major difference in the process is the source of ignition.
(b) In a diesel engine, air is compressed by the piston. As the pressure in the cylinder increases,
the air temperature increases. The diesel fuel is then injected into the piston cylinder as a fine mist. The
temperature of the air is sufficient to ignite the fuel and drive the piston downward.
(c) One of the most important properties of a diesel fuel is that it be capable of autoignition.
(3) Turbine engine:
(a) Air is compressed by a series of blades and routed to a combustion chamber.
(b) Fuel is injected into the combustion chamber and is ignited by an external source.
(c) Once the turbine is started, combustion is a continuous process, with the combustion keeping
the compressors tuning and producing power.
(d) Theoretically, any type of fuel can be used for combustion, but once the engine is designed, a
specific type of fuel must be used.
(4) Boilers:
(a) Boilers use burner fuel to create heat and transfer that heat to water in the form of steam.
(b) The steam transfers energy to an engine by tuning axles or shafts, creating power.
(c) One of the most important properties of a burner fuel is that it does not leave any sediment
during combustion. Any sediment will tend to clog steam lines and inhibit power production.
QM5200
22-4
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