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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Adiabatic process is

Reversible process
Essentially an isentropic process
Non-heat transfer process
Constant temperature process

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Steam Boilers, Engines, Nozzles and Turbines
Willian’s line follows the law (where b = A constant representing the shape of the Willian’s line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

m = a + b × I.P.
m = (b/I.P.) - a
I.P. = b × m + a
I.P. = a × m + b

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Steam Boilers, Engines, Nozzles and Turbines
Primary air is the air used to

Air delivered by forced draft fan
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Transport and dry the coal
Provide air around burners for obtaining optimum combustion

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Steam Boilers, Engines, Nozzles and Turbines
The economiser is used in boilers to

Extract heat from the exhaust flue gases
Economize on fuel
Increase thermal efficiency of boiler
Increase flue gas temperature

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Steam Boilers, Engines, Nozzles and Turbines
The heat balance sheet for the boiler shows the

Moisture present in the fuel
All of these
Steam formed by combustion of hydrogen per kg of fuel
Complete account of heat supplied by 1 kg of dry fuel and the heat consumed

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine, steam expands

Wholly in nozzle
Wholly in blades
Partly in the nozzle and partly in blades
None of these

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