Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

Fuels and Combustion
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

It reduces its calorific value tremendously

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

It reduces its flame temperature tremendously

There are chances of explosion during preheating

It reduces its calorific value tremendously

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

It reduces its flame temperature tremendously

There are chances of explosion during preheating

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Fuels and Combustion
Hard coke is manufactured from

Anthracite

Bituminous coal

Semi-anthracite

Lignite

Anthracite

Bituminous coal

Semi-anthracite

Lignite

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Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Lower carbon dioxide content

Higher methane content and thus higher calorific value

Higher carbon monoxide content

None of these

Lower carbon dioxide content

Higher methane content and thus higher calorific value

Higher carbon monoxide content

None of these

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

12

36

8

22

12

36

8

22

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

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

All of these

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

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

All of these

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

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Fuels and Combustion
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

In between 37 & 71%

< 37%

>71%

None of these

In between 37 & 71%

< 37%

>71%

None of these

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Fuels and Combustion

Fuels and Combustion Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

Fuels and Combustion Hard coke is manufactured from

Fuels and Combustion A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

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

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

Fuels and Combustion Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

Fuels and Combustion
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

Fuels and Combustion
Hard coke is manufactured from

Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

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

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

Fuels and Combustion
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.