Boiler ID Fan
Boiler ID Fan
(OP)
We have a 400HP, 480Volt, ID Fan being installed in a bag house for a 100,000 lb/hr boiler. The fan is made by Clarage and they have specified dampers on the discharge side of the fan only. There are no dampers on the inlet. The motor is powered by a VFD. It's designed so the outlet dampers will be wide open and the speed of the fan will be controlled through the VFD.
Is it possible to only have an outlet damper and not inlet dampers on an ID Fan? Wouldn't the lack of inlet dampers make the fan draw maximum current and pressurize the housing of the ID fan when starting?
Is it possible to only have an outlet damper and not inlet dampers on an ID Fan? Wouldn't the lack of inlet dampers make the fan draw maximum current and pressurize the housing of the ID fan when starting?





RE: Boiler ID Fan
The VFD will start the fan and gradually come up to (as dictated by control program) speed --the motor starting current and initial air flow are significantly reduced compared to the non-VFD starting methods...
RE: Boiler ID Fan
Just take care about the ramp up time during starting of the fan.
You should also note that the power drawn by any fluid handling device is proportional to the mass flow rate of the fluid across the device. So when you partially close the discharge, less fluid will be moved and so less power consumption.
Regards,
RE: Boiler ID Fan
RE: Boiler ID Fan