In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

Steam Boilers, Engines, Nozzles and Turbines
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

0.56

0.74

0.63

0.78

0.56

0.74

0.63

0.78

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Efficiency of the boiler

Efficiency of the chimney

Efficiency of the fan

Power of the boiler

Efficiency of the boiler

Efficiency of the chimney

Efficiency of the fan

Power of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
At which pressure the properties of water and steam become identical

225.6 kg/cm²

100 kg/cm²

1 kg/cm²

0.1 kg/cm²

225.6 kg/cm²

100 kg/cm²

1 kg/cm²

0.1 kg/cm²

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation is the amount of water evaporated in a boiler from and at

0°C

100°C

Room temperature

Saturation temperature at given pressure

0°C

100°C

Room temperature

Saturation temperature at given pressure

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Steam Boilers, Engines, Nozzles and Turbines
The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

T1 /88.25H

176.5H/T1

T1 /176.5H

88.25H/T1

T1 /88.25H

176.5H/T1

T1 /176.5H

88.25H/T1

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Steam Boilers, Engines, Nozzles and Turbines
Vacuum for reciprocating steam engines compared to steam turbines is

Could be more or less depending on the size of plant

More

Less

Equal

Could be more or less depending on the size of plant

More

Less

Equal

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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

Steam Boilers, Engines, Nozzles and Turbines The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Steam Boilers, Engines, Nozzles and Turbines At which pressure the properties of water and steam become identical

Steam Boilers, Engines, Nozzles and Turbines Equivalent evaporation is the amount of water evaporated in a boiler from and at

Steam Boilers, Engines, Nozzles and Turbines The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

Steam Boilers, Engines, Nozzles and Turbines Vacuum for reciprocating steam engines compared to steam turbines is

Steam Boilers, Engines, Nozzles and Turbines
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Steam Boilers, Engines, Nozzles and Turbines
At which pressure the properties of water and steam become identical

Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation is the amount of water evaporated in a boiler from and at

Steam Boilers, Engines, Nozzles and Turbines
The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

Steam Boilers, Engines, Nozzles and Turbines
Vacuum for reciprocating steam engines compared to steam turbines is