In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of_________________?

Byadmin March 11, 2019August 27, 2021

In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of_________________?

A. Transportation of coal
B. Drying of coal
C. Combustion of coal by supplying it around the burner
D. Preheating the primary air

CHEMICAL ENGINEERING | Furnace Technology

The amount of combustible escaping uncon-sumed from the furnace, depends upon the

Question: The amount of combustible escaping uncon-sumed from the furnace, depends upon the
[A].

air supplied and furnace temperature.
[B].
burner design (thoroughness of mixing versus stratification).
[C].
air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction).
[D].
all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Read More The amount of combustible escaping uncon-sumed from the furnace, depends upon the
Furnace Technology

Thermal efficiency of an open hearth furnace may be about _____________ percent?

Thermal efficiency of an open hearth furnace may be about _____________ percent?

A. 5
B. 20
C. 50
D. 80

Read More Thermal efficiency of an open hearth furnace may be about _____________ percent?
Furnace Technology

Circulation of gases in furnace is caused by the_________________?

Circulation of gases in furnace is caused by the_________________?

A. Change in volume during a change of temperature
B. Difference in density between hot and cold gases
C. Furnace pressure in conjunction with draft in flues
D. All A., B. and C.

Read More Circulation of gases in furnace is caused by the_________________?
Furnace Technology

Thermal efficiency of furnaces can be improved by____________________?

Thermal efficiency of furnaces can be improved by____________________?

A. Waste heat recovery from flue gas
B. Minimising heat losses from furnace walls
C. Maintaining proper draught
D. All A., B. and C.

Read More Thermal efficiency of furnaces can be improved by____________________?
Furnace Technology

Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?

Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?

A. Accelerating the rate of scaling
B. Causing metal embrittlement
C. Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at
high temperature
D. All A., B. and C.

Read More Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?
CHEMICAL ENGINEERING | Furnace Technology

In a furnace employing forced draught as compared to induced draught,

Question: In a furnace employing forced draught as compared to induced draught,
[A].

air is sucked in, so air leaks are more and hence the furnace efficiency is reduced.
[B].
the fan operates hot and hence blades are liable to corrosion and erosion.
[C].
positive pressure exists in the furnace.
[D].
none of these

Answer: Option C

Explanation:

No answer description available for this question.

Read More In a furnace employing forced draught as compared to induced draught,

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