The economiser is used in boilers to

Very high pressure boilers are usually __________ boilers.

A

Fire tube

B

Water tube

C

Waste heat

D

Natural circulation

Economiser is used to heat

A

air

B

feed water

C

flue gases

D

all above

The function of an economiser in a boiler is to preheat the

A

Feedwater

B

Combustion air

C

Pulverised coal

D

Furnace oil

An economiser _________ the steam raising capacity of a boiler.

A

Increases

B

Decreases

C

Has no effect on

D

None of these

An economiser is installed in a boiler primarily to

A

Superheat the steam

B

Reduce fuel consumption

C

Increase steam pressure

D

All of these

An economiser is generally placed between

A

Last superheater or reheater and air preheater

B

Induced draft fan and forced draft fan

C

Air preheater and chimney

D

None of the above

An economiser in a boiler

A

Increases steam pressure

B

Increases steam flow

C

Decreases fuel consumption

D

Decreases steam pressure

What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?

A

It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water

B

Economiser tube life increases due to handling of low temperature water

C

Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases

D

Scale formation rate on economiser tubes increases

Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.

A

1

B

10

C

30

D

45

The most commonly used combustion system manufactured in India for the thermal power plant boilers is the __________ combustion system.

A

Pulverised fuel

B

Travelling grate stoker firing

C

Circulating fluidised bed

D

Fluidised bed

The economiser is used in boilers to

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