[an error occurred while processing this directive]
Posted by Boeid on June 13, 2012 at 23:04:24:
Would like to get some feedbacks on the following. The boiler in question is a HRSG with supplementary firing.
1) Single inter-stage attemperator vs. Multi inter-stage attemperator
Single inter-stage attemperator is an attemperator where the water injection is in between 2 superheater banks. The water injection is controlled by a temperature controller at the final outlet of the HRSG (i.e.secondary or the last superheater bank)
Multi inter-stage attemperator is - in my case - 2 attemperators where the water injection are in between first and second superheater banks, and between second and third/final superheater banks, respectively.
The water injection for the 1st attemperator (between 1st and 2nd superheater banks) is controlled by a temperature controller at the final outlet of the HRSG and for the 2nd attemperator is by a temperature controller at the inlet of the 2nd superheater bank.
What are the reasons and the advantages of the multi inter-stage attemperator?
2) Degree of superheat (value of temperature above saturation point) of steam at in between superheater banks
What are the reasons and the advantages of having lower degree of superheat for steam at in between of the superheater banks?
This was achieved through design of the superheater banks and controlled of water injection at the 1st attemperator (for multi inter-stage attemperator design).
Post a Followup