Furnace Technology - Chemical Engineering Questions and Answers

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Tunnel kilns are usually used for

roasting of pyrites.

drying/tempering of refractories.

reheating of slabs.

melting of glass.

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The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent.

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Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by

increasing the draft in the furnace.

preheating the fuel gas.

oxygen enrichment of combustion air.

preheating the combustion air.

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Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by

preheating the combustion air.

oxygen enrichment of combustion air.

preheating the fuel gas.

all (a), (b) & (c).

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Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of

graphite powder

thoria

zircon powder

beryllium

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In reverberatory furnace, charge is heated mainly by

conduction.

natural convection.

radiation of heat from the roof of the combustion chamber.

none of these.

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An example of a periodic furnace is the

blast furnace stoves

blast furnace

coke oven heating chamber

rotary kilns

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Ostwald charts are meant for

computing the excess/deficiency of combustion air.

calculation of flue gas temperature.

computation of flue gas analysis.

none of these.

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Which of the following is a natural draft furnace ?

Blast furnace stoves

Power plant boilers

Sintering furnace

None of these