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Posted by Dann on May 14, 2009 at 15:25:31:
In Reply to: Steam Turbine. posted by Mark Moore on May 13, 2009 at 02:45:58:
: I am operating a 57 MW Brown Boveri condensing Turboset. (BBC). My question is how low can I operate the steam Turbine Outlet Temperature before you run the risk of condensing from low temperature. I was told to not go below 135 degree F. With the inlet temp coming in at 850 degrees and the ambient temp at 36 degrees F (or warmer during the day) and the barometic pressure at 30 my back pressure was running 6.5 HGA. With these numbers is there a risk of moisture on the low end blades? The control room has no set Standard control operting limits, so it all, he said, I said hand me down type of training. Any help will be greatly appreaciated.
I would think somewhere in the plant there should be volumes on control of this turbine. I would start by looking there. If there is no documentation regarding steam turbine control contact the manufacturer of turbine and request information. You should be able to get help from them by providing them a model number for the turbine. Most steam turbines do run with some mosture in the back end blades and the blades are generally coated for this reason. In fact the nubers you provided 6.5 HgA back pressure and 135 degrees does have a percentage of moisture in it as the saturation temperature is +/- 145 degrees. I would think that there should be a way to get a lower back pressure though. If you can get the back pressure down you gain power out.
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