A power boiler has the following data: Steam flow -------------------------------------- 25.2 kg/s Output at Station Bus -------------------------- 30,000 kW Fuel Consumption ------------------------------ 1.95 kg/s Input to furnace --------------------------------- 102635 kW Airflow through the unit: Theoretical air for combustion--------------- 27.17 kg/s Excess air required at burner----------------- 1.31 kg/s Leakage, air to gas in heater------------------- 0.58 kg/s Leakage, furnace, and boiler------------------- 2.65 kg/s Temperature, air into the air heater----------- 82 ℉ Temperature, the gas leaving the air heater-- 330 ℉ Atmospheric Pressure-------------------------- 101.2 kPa Air resistance, fan to furnace------------------ 5.75 in. H2O Air resistance, furnace-------------------------- 0.12 in. H2O Air resistance, boiler, and superheater-------- 1.50 in. H2O Air resistance, flues----------------------------- 0.26 in. H2O The above boiler is operating under a pressure furnace arrangement with a forced-draft fan only. Overall fan efficiency is 70 %. a) Find the air horsepower of the fan b) Find the motor input in horsepower of the fan
A power boiler has the following data:
Steam flow -------------------------------------- 25.2 kg/s
Output at Station Bus -------------------------- 30,000 kW
Fuel Consumption ------------------------------ 1.95 kg/s
Input to furnace --------------------------------- 102635 kW
Airflow through the unit:
Theoretical air for combustion--------------- 27.17 kg/s
Excess air required at burner----------------- 1.31 kg/s
Leakage, air to gas in heater------------------- 0.58 kg/s
Leakage, furnace, and boiler------------------- 2.65 kg/s
Temperature, air into the air heater----------- 82 ℉
Temperature, the gas leaving the air heater-- 330 ℉
Atmospheric Pressure-------------------------- 101.2 kPa
Air resistance, fan to furnace------------------ 5.75 in. H2O
Air resistance, furnace-------------------------- 0.12 in. H2O
Air resistance, boiler, and superheater-------- 1.50 in. H2O
Air resistance, flues----------------------------- 0.26 in. H2O
The above boiler is operating under a pressure furnace arrangement with a forced-draft fan only. Overall fan
efficiency is 70 %.
a) Find the air horsepower of the fan
b) Find the motor input in horsepower of the fan
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