Blowdown Heat Recovery

The steam recovered by flashing the blowdown, the heat recovered in the exchanger, and what is left.

Unit system

Inputs

Blowdown flow

Comes from the Blowdown Rate calculation.Boiler pressure (absolute)

Flash vessel pressure (absolute)

Usually the deaerator pressure — the flash steam goes straight there.Makeup water temperature (exchanger inlet)

Drain temperature after the exchanger

The lower it is, the more heat was taken. Sewer limits usually require 40–60 °C.

Flash steam recovered

36.39kg/h

Total heat recovered

42.26kW

The flash fraction is the excess of the boiler-pressure saturated-liquid enthalpy over the flash-pressure one, divided by the latent heat.
The flash steam is assumed to be USABLE in the deaerator. If it is not, only the exchanger term counts.

A PDF carrying the inputs, results, assumptions and the source. A one-time code is sent to your address.

Results are for engineering pre-assessment and are not a product selection commitment. Final responsibility rests with the user.