Condensate flow control for flue gas cooling

Dear all,

I would like to know whether you know any standard or commonly used control solution for the following problem:

I have a quench tower where several kind of flue gases enter. Before leaving the system through the flare I would like to cool it down as much as possible with condensate water (in the quench tower). 

I open the flow control valve and the flue gas is cooled and then released at the flare. Now the problem is that I don't know what type of gas is leaving, but I know that after a given control valve output the flue gas temperature is not decreasing anymore. It doesn't matter whether the valve is totally open or it stays just at the output (command) where the gas is not cooling down anymore. Of course, the more I open the valve, the higher condensate flow I obtain. I would like to control the system in that way that I do not waste condensate water anymore. 
I was thinking about a solution where I monitor the input/output ratio and at a given point I start to track the PID but this seems such a  mother wit solution to me.

Thank you for your ideas!
I've also attached a picture for more understanding:
http://kepfeltoltes.hu/141031/1366844895Untitled_www.kepfeltoltes.hu_.png


1 Reply

  • Great question, . I've moved the discussion to our Flow Community where I believe you will get a deeper response. However, I will also create copy and place it in the DeltaV or "Control" area...perhaps we can double up on our ask for expertise. :)

    Best Regards,

    Rachelle McWright: Business Development Manager, Dynamic Simulation: U.S. Gulf Coast