Fuels and Combustion - Chemical Engineering Questions and Answers

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Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.

smoke

temperature

oxygen

carbon monoxide

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Low temperature oxidation of stored coal results in the

decrease in its caking power & calorific value.

decrease in its carbon & hydrogen content.

increase in its oxygen content.

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

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Gross calorific value will be equal to the net calorific value for

H₂

C₂H₂

C₂H₆

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Bulk density of pulverised coal may be about __________ kg/m³.

100

500

1000

1500

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Pulverised coal used in boiler firing need not have

less moisture content

high fusion point of its ash

high bulk density

lower ash content

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Lurgi coal gasifier is a pressurised __________ bed reactor.

moving

fixed

fluidised

entrained

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Which is the most matured coal ?

Lignite

Bituminous

Semi-anthracite

Anthracite

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The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be

27.6

47.3

42.9

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Caking index of coal blend used for blast furnace coke making is about