Furnace Technology - Chemical Engineering Questions and Answers

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Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ?

Increase in calorific value of the fuel.

Increase in flame temperature.

Reduction in scale losses.

Saving in fuel consumption.

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A refractory wall separating the stock and the source of heat is provided in a

updraft kiln

muffle furnace

continuous furnace

none of these

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Which one shows the diagramatic heat balance in a furnace ?

Sankey diagram

Cox chart

Ostwald chart

None of these

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Decarburisation of steel

is the removal of carbon from iron carbide (Fe₃C).

affects its crystalline structure.

is favoured by CO₂.

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

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Blast furnace stoves are meant for heating

air

blast furnace gas

steam

none of these

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Fuel economy in furnaces can be achieved by

using oxygen enriched combustion air.

preheating the combustion air.

reducing the heat loss through furnace openings & doors.

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

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

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Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.

< 2

< 5

< 8

< 10

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Which of the following is a rotary furnace?

Lime kiln

Soaking pit

Stoves

Annealing furnace.