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Which of the given boilers velocity of flue gases is greater than velocity of sound?

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Which of the given boilers velocity of flue gases is greater than velocity of sound?

(a) Benson boiler

(b) La-Mont boiler

(c) Schmidt-Hartmann boiler

(d) Velox boiler

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My enquiry is from Types of High Pressure Boilers in division Steam Generators & Accessories of Energy Engineering

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The correct option is (d) Velox boiler

The explanation: Velox boiler is a forced circulation water tube boiler. In this boiler, the velocity of the flue gas is greater than the velocity of sound, which causes more heat transfer from gas to the water, which increases the steam generation rate. It is mostly used in gas turbine. Due to this reason it is one of the important boilers.

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