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 during the steam production.

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

q_BD = q_S f_c / (b_c - f_c)          (1)

where

q_BD = blowdown rate (kg/h)

q_S = steam consumption (kg/h)

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

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

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Related Topics

• Steam and Condensate - Steam & condensate properties - capacities, pipe sizing, systems configuration and more

Related Documents

• ASME - International Boiler and Pressure Vessel Code - The International Boiler and Pressure Vessel Code establishes rules of safety governing the design, fabrication, and inspection of boilers and pressure vessels, and nuclear power plant components during construction
• Boiler Blowdown - Suspended solids entering boilers through feed water will remain behind when steam is generated. After a while the concentration of solids makes the operation of the boiler unsatisfactory
• Boiler Capacity - It is common to express the output of steam boilers in Boiler Horsepower, MBTU or in Pounds of Steam delivered per hour
• Classifications of Boilers - Classification of boilers according ASME Boiler and Pressure Vessel Code
• Feedwater Temperature and Steam Boiler Rating - Fraction of boiler rating under operating conditions
• Recommended Feed Water Chemistry Limits - Steam boilers and ABMA recommended feed water chemistry limits
• Total Dissolved Solids (TDS) - In a boiler generating steam, impurities in the feedwater concentrates in the boiling water