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Furnace Technology

Furnace Technology
Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

20
80
40
65

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Furnace Technology
Fuel economy in furnaces can be achieved by

All of these
Reducing the heat loss through furnace openings & doors
Preheating the combustion air
Using oxygen enriched combustion air

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

Preheating of cold stock
Steam generation in waste heat boilers
All of these
Preheating of combustion air

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

Accelerating the rate of scaling
All of these
Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature
Causing metal embrittlement

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Furnace Technology
Maximum thermal efficiency of boiler may be about __________ percent.

25
10
65
90

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Furnace Technology
Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the

All of these
Amount of excess air supplied and load on the boiler
Type of burner and combustion chamber
Physical nature, ash content and fineness of the coal

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