FURNACE TECHNOLOGY QUIZ

The function of an economiser in a boiler is to preheat the

Pulverised coal

Combustion air

Feedwater

Furnace oil

TRUE ANSWER : ?
YOUR ANSWER : ?

Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the

Dust concentration & nature of dust in waste gas

All of these

Corrosive nature of the waste gas

Quantity & temperature of waste gas

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Turndown ratio of a burner gives an idea of the __________ in the furnace.

Minimum heat input rate only

Maximum heat input rate only

Volume of the combustion chamber

Range of fuel firing rates

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Scaling of furnace stock is reduced by __________ in flue gas.

All of these

H₂

High CO/CO₂

CO

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

< 10

< 8

< 5

< 2

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Large tonnage of refractory bricks are dried in a

Muffle furnace

Shaft furnace

Rotary hearth furnace

Tunnel kiln

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In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the

Sankey diagram

Ostwald chart

None of these

Cox chart

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Rate of heat release in a furnace, which is the measure of heat intensity is defined as

None of these

Kcal/m³ combustion space

Kcal/hr/m³ combustion space

Kcal/hr

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Advantages of use of preheated combustion air are

Increase in flame temperature

All of these

Saving in fuel consumption

Reduction in scale losses

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Which of the following variables does not affect the furnace capacity?

Ratio of wall surface to surface of stock

None of these

Gas velocity in furnace

Size of the furnace

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YOUR ANSWER : ?

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