FURNACE TECHNOLOGY QUIZ

Thermal efficiency of an open hearth furnace may be about __________ percent.

80

20

5

50

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YOUR ANSWER : ?

In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?

Regenerator

Recuperator

None of these

Waste heat boiler

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Artificial draught produced by a fan in the furnace can be controlled by the

All of these

Speed of the fan

Variation in the pitch of fan blades

Damper

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To reduce the stack loss, heat recovery from flue gas can be done by

All of these

Preheating of combustion air

Steam generation in waste heat boilers

Preheating of cold stock

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Presence of SO₂ in furnace gases attacks the ferrous metal by way of

Accelerating the rate of scaling

Causing metal embrittlement

All of these

Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature

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Which of the following is a directly fired intermittant furnace?

Walking beam reheating furnace

Reverberatory furnace

Tower furnace

Tunnel kiln

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__________ atmosphere is maintained inside an iron blast furnace.

Reducing

Decarburising

Oxidising

Inert

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Air filtration in a furnace

Increases the flue gas temperature

None of these

Is indicated by flame sting out

Reduces its thermal efficiency

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The heat recoverable from flue gases of furnaces depends on the

Quantity of flue gases

Thermal efficiency of furnace

Flue gas temperature drop through the furnace

All of these

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In a furnace employing forced draught as compared to induced draught,

The fan operates hot and hence blades are liable to corrosion and erosion

Positive pressure exists in the furnace

None of these

Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced

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