Boiler Blowdown Rate

The Boiler Blowdown rate refers to the rate at which the blowdown should occur in an operating boiler.  It describes the blowdown in kilograms per hour.


The Boiler blowdown rate depends on the quantity of the impurities and the limits of tolerance for the employees.  The Blowdown rate is a product of the steam consumption and the ratio of the level of the TDS to the difference between the maximum allowable TDS and the actual TDS. 

qBD = qS fc / (bc - fc) 

where
qBD    the blowdown rate in kg/hour
qS is the rate of steam consumption in kg/hour
fc is the total dissolved substances in ppm
bc is the limit of the total dissolved substances in ppm