Discussion on the power calculation of the induced draft fan in the desulfurization and denitration system
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In the coking plants in Inner Mongolia, for desulfurization and denitrification projects, the flue gas volume from the coke ovens is 290,000 standard cubic meters, the flue gas temperature is around 180°C, and the air pressure required for the exhaust fans is 6500 Pa. It is located in a highland area, where the local atmospheric pressure is 81.62 KPa. The calculation method is provided below; I’m not sure if the calculations are correct, so I would appreciate everyone’s guidance. Thank you!
Power is not calculated in this way.
Wrong, it has nothing to do with standard atmospheric pressure; it is related to the local atmospheric pressure and the pressure increase
1. The flue gas volume at the inlet of the exhaust fan also takes into account the air leakage coefficient of all the equipment and pipelines from the coke oven outlet to the exhaust fan inlet, as well as the flow rate margin factor of the exhaust fan； 2. The flue gas temperature at the inlet of the exhaust fan must take into account the temperature drop of the flue gas after desulfurization and denitrification ； 3. The atmospheric pressure for this project is 81.62 kPa, and the power of the exhaust fan must be adjusted taking into account the density of the smoke gases ； 4. Considering a air leakage coefficient of 1.2, a standby factor of 1.2, and a temperature drop of 30 degrees, the power required for the exhaust fan is approximately 1786 KW; therefore, 1800 KW is adopted.
Could you please provide the calculation process?
How can I think that this is the right thing to do? But this calculation should give the shaft power; with a power reserve factor of 1.2 for the motor, the resulting motor power is then divided by the mechanical efficiency to obtain the actual motor power
Is shaft power the same as fan power? I’m a bit dizzy