Why attemperation is required in HRSG in a combined cycle
power plant?

Answers were Sorted based on User's Feedback

Answer / randhir singh

To control steam temperatur during flue gas temperature variation and rapidly varing load condition.

Is This Answer Correct ?    14 Yes 1 No

Answer / kanawar

To control steam temp when flue gas temp is vary.

Is This Answer Correct ?    17 Yes 5 No

Answer / keyur donga

when the main steam temprature is goes high At varying load of the HRSG At this this time We maintain the Steam temp by using attempration in HRSG.

Is This Answer Correct ?    10 Yes 0 No

Answer / sitaram singh .bonduli

As the steam generated in HRSG shall be routed to the main steam pipeline of steam turbine , it should meet the design criteria (Design temp) hence The attemperation serve the purpose when Rapidly varying load conditions takes place.

Is This Answer Correct ?    8 Yes 3 No

Answer / baskaran

During gas turbine load reduce time, HP superheater temperature going to high temperature at that time Attamperator using in between HP superheater 1 &2.

Is This Answer Correct ?    1 Yes 0 No

Answer / murali

for control steam temp and to avoid secondary super heater coil metal temp high. becoz secondary coil location is near flue gas out from gas turbine. this gas temp around 620 degree Celsius

Is This Answer Correct ?    1 Yes 0 No

Answer / sunil

In CCPP secondary superheater coils are located near to flue gases and exhaust of gas turbine enters boiler . Exhaust of GT are at high temp around 600C

Is This Answer Correct ?    0 Yes 0 No

Answer / jayanta madhab

Attemperation required to protect costly superheater and
evaporator tubes from overheating during flue gas
temperature variation.

Is This Answer Correct ?    2 Yes 8 No

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