Question 63Steam Plants - Assistant Engineer

70% to pass

As compared with a typical front fired boiler, which of the listed conditions represents an advantage of a top fired boiler?

AMore uniform heat distribution and gas dwell is obtained within the furnace.
BNo division tube wall separating the convection and radiant sections of the furnace is ever required.
CA lower fuel flow rate can be allowed, thus increasing economy.
DSuperheating diaphragms may be omitted.
AI Explanation

The correct answer is A) More uniform heat distribution and gas dwell is obtained within the furnace. In a top-fired boiler, the heat source (burner) is located at the top of the furnace, which allows for a more even distribution of heat throughout the furnace chamber. This results in a more uniform heat transfer and longer dwell time for the combustion gases, leading to better heat absorption and efficiency compared to a typical front-fired boiler. The other options are incorrect because: B) Top-fired boilers may still require a division tube wall, C) Fuel flow rate is not necessarily lower in a top-fired boiler, and D) Superheating diaphragms may still be required in some top-fired boiler designs.

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