Question 282Steam Plants - Assistant Engineer70% to pass
The rate of heat transfer in a water-tube auxiliary boiler can be increased by _______________.
AI Explanation
The correct answer is B) installing fins on the firesides of water-tubes.
Explanation:
Installing fins on the water-tube surfaces increases the surface area exposed to the hot gases, which in turn increases the rate of heat transfer from the hot gases to the water in the tubes. This improves the overall efficiency and heat transfer capabilities of the water-tube auxiliary boiler.
The other answer choices are incorrect because:
A) Operating the boiler at less than normal water level would actually decrease the heat transfer rate by reducing the surface area of the water-tubes exposed to the heat.
C) Increasing excess air to the burners would not directly impact the rate of heat transfer in the boiler.
D) Chemical water treatment with oxygen scavengers would not affect the physical heat transfer mechanism in the boiler.
Related Questions
#280 The purpose of the separating nozzle in the accumulator of a water-tube, coil-type, steam generator is to separate _______________.#281 The gage glass on a coil-type auxiliary boiler is connected to the _______________.#283 Downcomers installed on auxiliary package boilers are protected from direct contact with hot gases by _______________.#284 Large steam drums are not required in the design of a coil-type auxiliary water-tube boiler because _______________.#285 The purpose of try-cocks used on an auxiliary boiler is to _______________.