4th Class Power Engineering 4B7 Practice Exam

What is the effect of silica fouling on heat transfer surfaces?

Silica deposit reduces corrosion risk. Silica improves heat transfer. Silica has no effect on heat transfer. Silica deposition reduces heat transfer efficiency.

Correct Answer:

Silica deposition reduces heat transfer efficiency.

Explanation:

Silica fouling creates a thin, insulating layer on heat transfer surfaces. That layer adds thermal resistance in series with the metal wall, so the overall heat transfer coefficient drops. With less heat passing through for the same temperature difference, the heat transfer efficiency decreases and more fuel is needed to achieve the same duty. It doesn’t improve heat transfer or reduce corrosion risk; deposits can actually worsen heating unevenness and corrosion under the scale.

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