Question 68Steam Plants - 1st Asst/Chief

The correct answer is B) installing fins on the firesides of water-tubes. The rate of heat transfer in a water-tube auxiliary boiler can be increased by installing fins on the firesides of the water-tubes. Fins increase the surface area of the water-tubes, which enhances the heat transfer from the hot combustion gases to the water, thereby improving the boiler's efficiency. The other options are incorrect because: A) Operating the boiler at less than normal water level would decrease heat transfer and boiler efficiency. C) Increasing the amount of excess air to the burners would actually decrease heat transfer. D) Treating the boiler water with chemical oxygen scavengers would not directly affect the rate of heat transfer.