Absorber Generator questions - Page 2
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  1. #14
    Join Date
    Mar 2004
    Posts
    72

    Hmm

    If air is not an issue you may want to check for restricted heat exchangers as well. In the event that the heat exchagers begin to plug up the temps and pressures may increase. Do all the other checks. Absorbers just suck no matter who made them, thus the vacuum.

    Not really an absorber fan as you may note.

  2. #15
    Join Date
    Aug 2000
    Location
    USA
    Posts
    4,984
    Lew2
    On that perticular absorber if the HTEX is plugging up the level in the absorber disapears and the gen overfills. Have seen 3 or 4 like that. The HTEX only has like 1/4" tubes in it, any rust or crap and its plugging up.

    Originally posted by lew2
    If air is not an issue you may want to check for restricted heat exchangers as well. In the event that the heat exchagers begin to plug up the temps and pressures may increase. Do all the other checks. Absorbers just suck no matter who made them, thus the vacuum.

    Not really an absorber fan as you may note.

  3. #16
    Join Date
    Apr 2004
    Posts
    423
    are these units at MCO?

  4. #17
    Join Date
    Jun 2003
    Location
    in a tree looking in your window
    Posts
    1,156
    Abs,

    You are probably right on with the burner setup, but I have a couple questions.

    Doesn't that machine look at strong concentration and modulate the burner firing rate? At 330 deg. he ought to be cooking pretty strong, I am wondering if he doesnt have some non-condensibles in there if he is going off on high pressure. Doesn't it also have a VFD on the solution pump, could he be not pumping the proper amount of brine to the generator.

    Dude
    If you dont stand behind our troops, please feel free...........to stand in front of them.

  5. #18
    Join Date
    Aug 2000
    Location
    USA
    Posts
    4,984
    It looks at the leaving water temp for firing rate in normal operation. There should be limits in it for high pressure overide and hi temp overide to back the burner off also as safeties before you lock out on the limits. They use a level control in the HTG to control the vfd to the pump the HTG.

    Non condensables is a good possibility, but they are making temp once the machines settles out. So I kinda ruled this out. Without knowing ALL the info, solution temps, concentrations, pressures, LiBr in H2O, flows etc, the overfiring would be my best guess. It will solve the imediate problem at hand of problems at startup. Adjusting the burner is not going to lower the temps at setpoint but it will help at full load and startups. There are obviously other problems besides possibly being overfired.

    He stated he thought it had LiBr in the refrigerant. This will cause a higher firing rate. Once they try blowing it down theyll need to recheck it. Its not uncommon to lose tubes in the LTG and cause this. Seen this problem a few times too.

    [Edited by absrbrtek on 07-04-2004 at 10:35 AM]

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