Chemical Engineering - Furnace Technology

Exercise :: Furnace Technology - Section 1

36. 

The reason for excessive clinker formation in gas producers is the

A. use of coal/coke containing a high % of fines and ash.
B. use of fuel having too low an ash fusion temperature.
C. development of hot spots in the fuel bed and an abnormally high rate of gasification.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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37. 

Which of the following is not an additive for flue gases from furnace to reduce its dew-point?

A. Ammonia
B. Fine dolomite
C. Alkaline powders
D. None of these

Answer: Option D

Explanation:

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38. 

Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.

A. 80
B. 130
C. 180
D. 250

Answer: Option B

Explanation:

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39. 

Low stack loss indicates the

A. use of sub-stoichiometric air for combustion.
B. efficient use of fuel.
C. inefficient use of fuel.
D. oxygen enrichment of combustion air.

Answer: Option B

Explanation:

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40. 

Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.

A. 20
B. 40
C. 60
D. 80

Answer: Option D

Explanation:

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