FURNACE TECHNOLOGY QUIZ

In producer gas making furnace, steam is added along with air to mainly control the

Tar content in producer gas

Fusion of coal ash & clinker formation

V. of producer gas

Temperature of producer gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Circulation of gases in furnace is caused by the

Difference in density between hot and cold gases

Furnace pressure in conjunction with draft in flues

Change in volume during a change of temperature

All of these

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Advantages of use of preheated combustion air are

Saving in fuel consumption

Reduction in scale losses

Increase in flame temperature

All of these

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Soaking pits are meant for heating steel

Ingots

Slabs

Coils

Sheets

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

Positive pressure exists in the furnace

None of these

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

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

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Thermal efficiency of furnaces can be improved by

Minimising heat losses from furnace walls

Maintaining proper draught

Waste heat recovery from flue gas

All of these

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An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.

Walking beam

Rotary hearth

Tunnel

Shaft

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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

Thoria

Beryllium

Graphite powder

Zircon powder

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

40

20

65

80

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Use of pulverised coal in boilers provides

Better combustion

Less erosion on furnace wall

Smokeless burning

Higher calorific value

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