FUELS AND COMBUSTION QUIZ

Advantages of fluidised bed combustion are

All of these

High heat transfer rate

Reduced NOx formation in flue gas

Lower furnace operating temperature

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Presence of free moisture in coal is most disadvantageous during

None of these

Combustion of fire slacks on the grates

Handling (e.g. when emptying wagons)

Its pulverisation (as it requires more power)

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Ignition temperature decreases progressively from anthracite to lignite, because

Moisture content increases

Carbon content decreases

Volatile matter content increases

Ash content increases

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Lignite is

A coking coal

A black banded coal which burns with a non-smoky yellowish flame

A high rank coal

Can be used for gasification and steam generation

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Coal tar fuel - 200 (CTF 200) is a mixture of

Light oil and pitch

Solar oil and pitch

Pitch and creosote oil

Anthracene and crecosote oil

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The shift conversion reaction taking place during water gas manufacture is given by

C + H₂O ⟷ CO + H₂

None of these

CO + H₂O ⟷ CO₂ + H₂

C + 2H₂O ⟷ CO₂ + 2H₂

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Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is

12.5

10

20

0

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In low temperature carbonisation (as compared to high temperature carbonisation) of coal

All of these

Free carbon in tar is more

Aliphatic tar is produced

Ammonia yield is more

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Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of

BaSO₄ & NaCl

MgSO₄ & BaCl₂

MgO & Na₂CO₃

MgCO₃ & NaCl

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Main constituents of purified Lurgi gas are

N₂, H₂ & CO₂

CO₂, O₂ & CO

CO, H₂ & CH₄

H₂, CmHn & CO₂

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