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Singh on HRSG HP drum level at start

By: Singh [396] 0 Stars
Date: Wednesday, January 30, 2008
Time: 12:02:25 AM

Thanks a lot for your comments.
But there are a few things I don't understand very clearly. Hopefully you can help some more.
Tight baffling and two water levels isn't very clear. We have 3 level transmitters that we rely on and as far as I understand the lower leg of the standpipe is connected to water side and the upper leg to the steam side of the drum.
I understand the stalling of circulation though.
Do you mean to say that the sharp drop in level is apparent and not real? But we have tripped a few times on Low low level for which 2 separate level switches are used.
When you ask about the blow down during the first half hour, do you mean during start? We don't normally blow down. Only if level goes high, which happens in a cold start.
The firing rate of the GT can't be changed as it is optimised to get a desired acceleration of the GT to FSNL(full speed no load). The synchronisation can be delayed and the loading rate can also be limited. But the level already reaches a precarious value by then.
Water can be added but there is some concern regarding adding of cold water making the situation worse. As the water passes through the warm economiser before entering the drum, is that a valid concern?
FInally, why do we not experience the problem to the same extent when the boiler is really hot, say within 2 hours of a shutdown? In this case the level goes down by some but then quickly strts to swell.
I really appreciate your help.
Can you give me your mail id if you don't mind?
Our plant is in the middle east. The GT is Siemens V94.3 and the HRSG is from NECCT.

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