Selection of feed water pump for waste heat boiler
Thread Content
I have a waste heat boiler for which I need to select a feed water pump with a flow rate of 2 M3/h and a pressure of 0.8 MPa
How far is it from the water pump to the boiler? The DG6-25X5 should be sufficient; your details aren’t detailed enough
The water pump is 50 meters away from the boiler. The boiler pressure is 0.8 MPa, with an evaporation rate of 1.6 T/h.
Feed pump head = Pressure at which the boiler safety valve opens + Resistance loss in the feed water pipeline under maximum load + Resistance loss in the economizer under maximum load + Height difference from the feed pump to the boiler drum + 10% excess pressure； Feed pump flow rate = Maximum boiler evaporation rate + Boiler blowdown losses (1%~5%; higher values when water quality is poor, lower values when water quality is good) + Cooling water and other water consumptions (mainly those required by the temperature reduction valves) + 10% surplus flow rate
Thank you very much. Question: If the setting pressure of the boiler safety valve is 0.8 MPa, what should be the head of the feed water pump?
The head of the feed pump is calculated based on parameters such as the pressure at the pump inlet and outlet, the installation height at the pump inlet, the installation height at the far end of the pump outlet, the length of the pump outlet pipeline, and the pressure loss due to the fittings in the pump outlet pipeline.
Choosing a flow rate of 2.5 cubic meters and a head of 85~90 meters will meet the requirements.