Chemical Engineering - Furnace Technology

Exercise :: Furnace Technology - Section 3

21. 

Which is not accomplished in an underfired furnace ?

A. Increase in heating capacity/m2 of floor space.
B. Elimination of cold spot at the bottom of the charge.
C. Reduction in the temperature of furnace gases.
D. Portection of the periphery of the charge from excessive radiation.

Answer: Option A

Explanation:

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22. 

In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of

A. use of non-preheated combustion air.
B. use of pulverised solid fuels.
C. imperfect mixing of fuel & air and infiltration of air.
D. use of excessive positive draft in the furnace.

Answer: Option C

Explanation:

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23. 

Rate of heat release in a furnace, which is the measure of heat intensity is defined as

A. kcal/hr/m3 combustion space.
B. kcal/m3 combustion space.
C. kcal/hr.
D. none of these.

Answer: Option A

Explanation:

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24. 

Oxygen enrichment of combustion air does not result in increase of the

A. flame temperature.
B. oxygen in the flue gas.
C. stack loss.
D. heat transfer rate in the furnace.

Answer: Option B

Explanation:

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25. 

An example of recuperative furnace is the

A. soaking pit
B. open hearth furnace
C. coke ovens
D. none of these

Answer: Option A

Explanation:

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