Furnace Technology - Chemical Engineering Questions and Answers

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Power required in case of forced draught as compared to induced draught (for the same draught produced) is

same

less

either more or less; depends on the flue gas density

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Means for giving direction to the circulation of gases in furnaces are

fans.

arrangement of heating stock in the furnaces.

location of outlet ports and heating & combustion devices.

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

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The amount of combustible escaping uncon-sumed from the furnace, depends upon the

air supplied and furnace temperature.

burner design (thoroughness of mixing versus stratification).

air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction).

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

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__________ is an indirectly heated furnace.

Open hearth furnace

Muffle furnace

Soaking pit

Reheating furnace

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The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.

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In a muffle furnace, the muffle

retards the heat transfer.

assists in temperature equalisation in the charge.

permits the use of controlled atmosphere for the protection of stock.

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

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Which is not a hearth furnace ?

Glass tank furnace

Open hearth furnace

Cupola

Reheating furnace

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An example of shaft furnace is the

L.D. converter

glass melting tank

blast furnace

soaking pit