Site selection for diesel power generator

The water flowing from the dam is received by an enlarged body of water at the intake. It is called the fore bay.

An economizer is a feed-water heater. It extracts a part of the heat carried away by the flue gases up to the chimney and uses it to heat the feed water to the boiler. A boiler or a steam generator is one of the most important equipment in a thermal station. It consists of a closed vessel into which water is allowed and is heated to convert it into steam at the required pressure. Depending upon the contents of the tubular heating surface, the boilers are classified as:

Fire tube boilers and

Water tube boilers.

Super heater is one of the auxiliary equipment used to increase the efficiency of a boiler, in addition to such others as air pre heaters (economizers) and feed-water heaters. A super heater is used to remove the last traces of moisture from the saturated steam which is leaving the boiler tube and to raise the temperature of the steam. Super heaters may be classified into (a) convection type, (b) radiant type, and (c) the combination of the convection and radiant types. In the turbines, the steam expanded in the nozzles attains a high velocity. The steam jet impinges on the blades of rotor, which may be a built-up rotor or an integral rotor.

In a reaction turbine, the expansion of the steam takes place only partially in the nozzle.

A condenser condenses the steam exhausted from the turbine. It helps maintain a low pressure (below the atmospheric pressure) at the exhaust. This use of a condenser in a power plant improves the efficiency.

The condensers are of two types. They are:

Mixing type or jet condensers and

Non-mixing type or surface condensers.

Depending upon the method of creating air movement through the cooling towers, they can be classified as:

Natural draught cooling towers,

Forced draught cooling towers, and

Induced draught cooling towers.

In modern power generator, the purpose of the chimney is to discharge the exhaust gases into the atmosphere at a high elevation so as to avoid the nuisance to the people living in the locality. Coolant removes heat from the fuel elements and transfers it to the water.