Question 452Steam Plants - Assistant Engineer

The correct answer is B) increase heater efficiency. The fins on the tubes of a fin-type fuel oil heater are designed to increase the surface area of the tubes, which in turn enhances the heat transfer from the hot gases to the fuel oil flowing through the tubes. This increased heat transfer improves the overall efficiency of the fuel oil heater, allowing it to more effectively raise the temperature of the fuel oil to the desired level. The other options are incorrect because the fins are not primarily intended to prevent tube erosion (A), clean the fuel oil (C), or decrease fuel flow (D). The fins' main purpose is to enhance the heat exchange process and boost the heater's thermal efficiency.