Q 1, What is Boiler Accessories?
Ans. Boiler accessories are auxiliary plants that help in proper operation of the boiler and also increase its efficiency. Feed pumps, injector, superheater, air preheater, economizer, superheater are some commonly used boiler accessories.
Q 2. Purpose of boiler feed pump used in boiler?
Ans. Feed pump is used to deliver feed water to the boiler. Reciprocating pump and rotary pump are the commonly used feed pumps. Reciprocating pump is classified into single acting and double acting pump.
Q 3. In single and double acting reciprocating pump, water is displaced by?
Ans. In a double acting reciprocating pump, water is displaced by both side of the piston. This is the reason why water is discharged in each stroke. In case of single acting pump water is displaced be only one side of the piston and hence water is discharged in alternate strokes.
Q 4. Injector is used in which type of boiler?
Ans.Injector is used to feed water into a boiler. It is used in place of feed pump when there isn’t enough space to install a feed pump. It is usually used in vertical and locomotive boilers. It is not at all used in case of high capacity and high pressure boilers.
Q 5. Is pumping efficiency of an injector is high?
Ans. The pumping efficiency of an injector is low. But its thermal efficiency is high. It is compact and has low initial cost. It cannot be used to force very hot water.
Q 6. What is the function of economizer? and its types
Ans. Economizer makes use of waste heat from the hot gases to heat the feed water before suppling it to the boiler. There are two types of economizers – independent type and integral type. Independent type economizer is installed in the pathway of the hot gases. Integral type economizer is situated in the boiler setting itself.
Q 7. What is Green’s economiser?
Ans. Green’s economiser is an independent type economiser. It is put into service for boilers of medium pressure range upto about 25 bar. The direction of flow of flue gases around the tubes is opposite to the flow of the water. A blow-off cock is allocated at the end of vertical pipes for removal of sediment deposits.
Q 8. What is the function of an air preheater?
Ans. The function of an air preheater is to heat the air that is supplied to the furnace. It helps in the combustion and eases the burning of coal. It consists of plates or tubes with hot gases on one side and air on the other.
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