Steam Boilers, Engines, Nozzles and Turbines
Relative percentage of heat absorbed through the heat transfer of (i) Furnace water wall (ii) Boiler tank (iii) Superheater (iv) Economizer (v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

10 : 7 : 15 : 20 : 48
7 : 15 : 20 : 10 : 48
48 : 20 : 15 : 7 : 10
20 : 48 : 7 : 15 : 10

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Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

By direct mixing
Heat is transferred by bleeding some gases from furnace
From heating an intermediate material and then heating the air from this material
From a metal wall from one medium to another

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Steam Boilers, Engines, Nozzles and Turbines
The principal function of a stop valve is to

Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Increase the temperature of saturated steam without raising its pressure
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

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