4th Class Power Engineering 4B7 Practice Exam

What is the primary purpose of boiler blowdown?

Removes dissolved solids from the boiler water Heats the feedwater before it enters the boiler Adds boiler water to maintain level Reduces boiler pressure

Correct Answer:

Removes dissolved solids from the boiler water

Explanation:

Blowdown is used to control the concentration of dissolved solids in the boiler water. As water is boiled and steam leaves, minerals and other dissolved impurities stay behind and become more concentrated. If this concentration gets too high, minerals can form scale on heat transfer surfaces and corrosive conditions can develop, lowering heat transfer efficiency and risking equipment damage. Discharging a portion of the boiler water removes those dissolved solids, bringing the remaining water back to acceptable levels. This can be done continuously at a low rate or intermittently as needed. It isn’t meant to heat feedwater, add makeup water to maintain level, or reduce boiler pressure.

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