Boiler Accessories: These are the devices which are used as integral parts of a boiler and help in running efficiently.
- Feed pump
- Super heater
- Air Preheater
1. Feed pump
It is used to deliver water to the boiler. A feed pump may be of centrifugal type or reciprocating type. But a double acting reciprocating pump is commonly used as a feed pump.
2. Super heater
It is an important devices of a steam generating unit. Its purpose is to increase the temperature of saturated steam without raising its pressure. It is generally an integral part of a boiler and is places in the path of hot flue gases from the furnace.
- Steam consumption of the engine is reduced.
- Losses due to the condensation in the cylinders and steam pipes are reduced.
- Efficiency of the steam plant is increased.
An Economiser is a device used to heat feed water by utilizing the heat in the exhaust flue gases before leaving through the chimney.
- There is about 15-20% of coal saving
- It increases the steam raising capacity of a boiler
- Its prevents formation of scale in boiler water tubes, because the scale now formed in the economiser tubes, which can be cleaned easily.