Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?

Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

A

Ash disposal problem

B

Excessive fly-ash discharge from the stack

C

High 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

Capital cost of pulverised fuel firing is less than hand firing.

A

True

B

False

Use of pulverised coal in boiler furnace provides

A

High calorific value

B

Better combustion

C

Smokeless burning

D

Less erosion on furnace walls

Which type of firing technique is employed for pulverised coal?

A

Oxidation firing

B

Reduction firing

C

Front wall firing

D

Raku firing

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

Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

A

Multicyclones

B

Bag filter

C

Wet scrubber

D

Hydrocyclones

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?

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