Chemical Engineering - Furnace Technology

Exercise :: Furnace Technology - Section 3

11. 

Fuel economy in an industrial furnace operation can not be achieved by the use of

A. stoichiometric combustion air.
B. non-preheated combustion air.
C. combustion air not enriched with oxygen.
D. recupterators.

Answer: Option A

Explanation:

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12. 

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

A. feedwater
B. combustion air
C. pulverised coal
D. furnace oil

Answer: Option A

Explanation:

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13. 

Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?

A. Coke oven.
B. Blast furnace stoves.
C. Beehive coke oven.
D. High pressure boiler.

Answer: Option D

Explanation:

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14. 

Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.

A. 5
B. 60
C. 20
D. 40

Answer: Option C

Explanation:

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15. 

The advantages of firing pulverised coal in the furnace lies in the fact that, it

A. permits the use of high ash content coal.
B. permits the use of low fusion point ash coal.
C. accelerates the burning rate and economises on fuel consumption.
D. all (a), (b) and (c).

Answer: Option C

Explanation:

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