During polytropic process

Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

Steam may be wet, dry or superheated after expansion

Heat transfer takes place across cylinder walls

All of these

Work is done

Steam may be wet, dry or superheated after expansion

Heat transfer takes place across cylinder walls

All of these

Work is done

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Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine, when steam flows through the fixed blades,

Pressure and velocity both decreases

Pressure and velocity both increases

Pressure decreases while velocity increases

Pressure increases while velocity decreases

Pressure and velocity both decreases

Pressure and velocity both increases

Pressure decreases while velocity increases

Pressure increases while velocity decreases

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Steam Boilers, Engines, Nozzles and Turbines
In accelerated circulation type boiler

Water is converted into steam in one pass without any recirculation

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

Feed pump is employed to supplement natural circulation in water wall type furnace

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

Water is converted into steam in one pass without any recirculation

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

Feed pump is employed to supplement natural circulation in water wall type furnace

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

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

From a metal wall from one medium to another

Heat is transferred by bleeding some gas from furnace

By direct mixing

From heating an intermediate material and then heating the air from this material

From a metal wall from one medium to another

Heat is transferred by bleeding some gas from furnace

By direct mixing

From heating an intermediate material and then heating the air from this material

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Steam Boilers, Engines, Nozzles and Turbines
Boiler parameters are expressed by

Temperature of steam in °C

Pressure of steam in kg/cm²

All of these

Tonnes/hr. of steam

Temperature of steam in °C

Pressure of steam in kg/cm²

All of these

Tonnes/hr. of steam

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Steam Boilers, Engines, Nozzles and Turbines
For water, at pressures below atmospheric;

Melting point drops slightly and boiling point drops markedly

Melting point rises markedly and boiling point drops markedly

Melting point rises slightly and boiling point drops markedly

Melting point drops slightly and boiling point drops slightly

Melting point drops slightly and boiling point drops markedly

Melting point rises markedly and boiling point drops markedly

Melting point rises slightly and boiling point drops markedly

Melting point drops slightly and boiling point drops slightly

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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines During polytropic process

Steam Boilers, Engines, Nozzles and Turbines In a reaction turbine, when steam flows through the fixed blades,

Steam Boilers, Engines, Nozzles and Turbines In accelerated circulation type boiler

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

Steam Boilers, Engines, Nozzles and Turbines Boiler parameters are expressed by

Steam Boilers, Engines, Nozzles and Turbines For water, at pressures below atmospheric;

Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine, when steam flows through the fixed blades,

Steam Boilers, Engines, Nozzles and Turbines
In accelerated circulation type boiler

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

Steam Boilers, Engines, Nozzles and Turbines
Boiler parameters are expressed by

Steam Boilers, Engines, Nozzles and Turbines
For water, at pressures below atmospheric;