Related Questions

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
The excess air required for the combustion of pulverised coal is of the order of about __________ percent.
A 5
B 15
C 30
D 45
Combustion of pulverised fuel
A Requires larger combustion chamber than rich gaseous fuel
B In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
C Suppresses the discharge of fine dust and grit into atmosphere
D All of the above
Which of the following is used for primary crushing of very hard lumpy materials?
A Toothed roll crusher
B Gyratory crusher
C Ball mill
D Tube mill
Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
A Reduce SO2 content in
B Catalytically convert SO2 to SO3 in
C Increase the dew point of
D None of these
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
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
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
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
The main function of primary air in pulverised coal fired burner is to
A Burn CO to CO2
B Dry and transport the coal
C Have proper combustion by supplying it around the burner
D Preheat the tertiary air used for complete combustion of CO to CO2

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