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Boiler Blowdown Rate

Calculating boiler blowdown rate

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A blowdown of the boiler is a routine operation necessary due to the increased concentration of Total Dissolved Solids - TDS - in the boiler water when producing steam.

The blow down rate of a boiler depends on

  • steam consumption (steam used in the process and not returned as condensate to the boiler)
  • concentration of impurities in the feed water
  • maximum allowable TDS in the boiler

The blowdown rate can be calculated as

qBD = qS fc / (bc - fc)                                        (1)

where

qBD = blowdown rate (kg/h)

qS = steam consumption (kg/h)

fc = Total Dissolved Solids - TDS - in the feed water (ppm)

bc = maximum allowable Total Dissolved Solids - TDS - in the boiler water (ppm)

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