Question 57Steam Plants - Assistant Engineer

70% to pass

How is boiler water forced to circulate faster in accelerated natural circulation boilers as compared to free natural circulation boilers?

AIncreasing the density of the water.
BIncreasing the inclined angle of the generating tubes.
CIncreasing the surface area of the economizer exposed to the combustion gases.
DInstalling a water circulating pump, such as a hydrokineter.
AI Explanation

The correct answer is B) Increasing the inclined angle of the generating tubes. In accelerated natural circulation boilers, the inclined angle of the generating tubes is increased compared to free natural circulation boilers. This increased angle enhances the natural convection effect, creating a stronger driving force that circulates the boiler water more rapidly. The steeper angle promotes faster movement of the heated water up the tubes, leading to improved circulation and heat transfer within the boiler system. The other options, such as increasing water density or economizer surface area, do not directly address the mechanism of accelerated natural circulation.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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