Related Questions

Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
A Ash disposal problem
B Excessive fly ash discharge from the stack
C Higher power consumption in its transportation
D Erosion of induced draft fan blades
Pulverised coal used in boiler firing need not have
A Less moisture content
B High fusion point of its ash
C High bulk density
D Lower ash content
Use of pulverised coal in boiler furnace provides
A High calorific value
B Better combustion
C Smokeless burning
D Less erosion on furnace walls
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 of the above
Function of secondary air in pulverised coal firing is to
A Transport the coal to the burner
B Dry the coal
C Ensure efficient burning of coal around the burner
D Reduce primary air requirement
The advantage 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 combustion
D All of the above
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
Coal is pulverised before burning in large capacity boiler furnaces mainly to
A Ensure its complete combustion
B Facilitate easy ash removal
C Enhance its calorific value
D Provide trouble free operation
Combustion of pulverised coal as compared to that of lump coal
A Develops a non-luminous flame
B Develops a low temperature flame
C Can be done with less excess air
D Provides a lower rate of heat release
Combustion of pulverised coal compared to the lumpy coal
A Provides better control of furnace temperature
B Facilitates combustion with lower excess air
C Provides higher thermal efficiency & flame temperature
D All of the above

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