Furnace Technology - Chemical Engineering Questions and Answers

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Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.

100

150

250

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Very high pressure boilers are usually __________ boilers.

fire tube

water tube

waste heat

natural circulation

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Heat transfer rate to the charge/stock in a furnace does not depend upon the

type of fuels viz solid, liquid or gaseous.

flue gas temperature.

emissivity of refractory walls.

initial temperature of the charged stock.

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Heat balance of furnace provides means of determining the

thermal efficiency of the process.

sources of heat losses.

scope of reduction of heat losses.

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

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Thermal efficiency of furnaces can be improved by

waste heat recovery from flue gas.

minimising heat losses from furnace walls.

maintaining proper draught.

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

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Shaft furnaces are used for

smelting

calcining

roasting

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

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Hearth furnaces are not used for

roasting

melting

reheating

none of these

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Turn down ratio of a burner

should be as low as possible i.e., 1 : 2.

should be 1:1 for a batch type furnace..

is the ratio of maximum to minimum permissible heat input rates.

is normally much more for a continuous furnace as compared to a batch furnace.

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Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?

Economiser.

Regenerator.

Ceramic recuperator.

Waste heat boiler.