It is a poniard in
which a diesel engine is used as a prime mover for the generation of electrical
energy. The diesel engine obtains energy from a liquid fuel usually called
diesel oil and converts it into mechanical energy.An alternator or a DC
generator mechanically coupled to the diesel engine to convert the mechanical
energy into electrical energy.
A
diesel electric power plant is also included in this workshop to supply the
electric power in absence of both north feeder and south feeder. It works to
generate the required electrical power for the workshop.
Diesel Engine:
This is the main
component of the power plant which develops power. This may be horizontal or
vertical type. The horizontal type diesel engine is used in this workshop.
These engines are available in low, medium and high range. Speeds commonly used
are in the range of 5000 to 1000 rpm. The rating of an engine which should be
specified correctly is the net output in KW developed continuously at the crank
shaft coupling by the engine in good operating condition, at a height of less
than 450 m at a temperature of 32 Deg C and barometric pressure 717.5mm Hg.
The
air filter are provided to remove dust and other suspended impurities from air
to be supplied to the engine. The super charger is usually employed to increase
the pressure of intake air above atmospheric Ozone in order to develop an
increased power output. The air is drawn from outside the engine room and
delivered to the Intel manifold through ducts or pipes and filters. In cold
season the intake air is heated by the heat from exhaust gases.
Fuel transfer pumps are required to
transfer fuel from delivery point to storage tanks and form storage tanks to
day tanks and then to engine. Strainers are provided to remove suspended
impurities and thus ensure clean fuel supply to the engine. Heater are required
to clean the oil especially during winter season.
This system is provided
to discharge the engine exhaust to the atmosphere outside the building. The
temperature of exhaust gas is high so its heat is utilized in heating oil or
air supplied to the engine in winter season.
In engine the heat is generated due to
burning of and it uses partially gets converted into useful work. The remainder
is wasted as heat in the outgoing exhaust gases and in heating the engine, and
if not removed may disintegrate the lubricating oil film on the cylinder walls
and damage the cylinder liners, head, walls piston and rings.
So small engines may be air cooled but
large engines mostly make use of forced water cooling cooled cold water is send
through the cylinder jacket with the help of a pump. The hot water is cooled in
spray pond and is circulated. The water used for cooling engine cylinder is
softened by water filtration plant in order to avoid formation of scales etc.
in it. Hot well is provided in surge tank to make a provision for expansion of
jacket water.
