Low temperature oxidation of stored coal results in the

Fuels and Combustion
Low temperature oxidation of stored coal results in the

Increase in its oxygen content

All of these

Decrease in its caking power & calorific value

Decrease in its carbon & hydrogen content

Increase in its oxygen content

All of these

Decrease in its caking power & calorific value

Decrease in its carbon & hydrogen content

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Fuels and Combustion
Size of blast furnace grade coke is __________ mm.

>100

25-80

0-15

15-25

>100

25-80

0-15

15-25

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Fuels and Combustion
A coal with high ash content is undesirable, as

The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the

All of these

The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes

It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the

All of these

The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes

It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

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Fuels and Combustion
The advantage of firing pulverised coal in the furnace lies in the fact, that it

All of these

Permits the use of high ash content coal

Permits the use of low fusion point ash coal

Accelerates the burning rate and economises on fuel combustion

All of these

Permits the use of high ash content coal

Permits the use of low fusion point ash coal

Accelerates the burning rate and economises on fuel combustion

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Fuels and Combustion
Main use of hard coke produced by high temperature carbonisation is in the

Sinter making

Domestic ovens

Iron blast furnace

Cupola in foundaries

Sinter making

Domestic ovens

Iron blast furnace

Cupola in foundaries

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Fuels and Combustion
If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as

CO

O₂

SO₂

N₂

CO

O₂

SO₂

N₂

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Fuels and Combustion

Fuels and Combustion Low temperature oxidation of stored coal results in the

Fuels and Combustion Size of blast furnace grade coke is __________ mm.

Fuels and Combustion A coal with high ash content is undesirable, as

Fuels and Combustion The advantage of firing pulverised coal in the furnace lies in the fact, that it

Fuels and Combustion Main use of hard coke produced by high temperature carbonisation is in the

Fuels and Combustion If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as

Fuels and Combustion
Low temperature oxidation of stored coal results in the

Fuels and Combustion
Size of blast furnace grade coke is __________ mm.

Fuels and Combustion
A coal with high ash content is undesirable, as

Fuels and Combustion
The advantage of firing pulverised coal in the furnace lies in the fact, that it

Fuels and Combustion
Main use of hard coke produced by high temperature carbonisation is in the

Fuels and Combustion
If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as