Calculating efficiency loss from a tube leak
Calculating efficiency loss from a tube leak
(OP)
We had a tube leak in the LP Evaporator section of the HRSG. I know the pressure and temperature in that section. I also know the size of the tube leak. (lbs/hr) How can I calculate a btu loss from the leak that I can use to show an adjustment to our heat rate? Basically I just put Fuel Burned (mmBTU) over net MWs out. Can anyone provide asistance?





RE: Calculating efficiency loss from a tube leak
RE: Calculating efficiency loss from a tube leak
But Metengr pointed out the major cost. A leak like this can take out an entire bank of tubes.
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RE: Calculating efficiency loss from a tube leak
However things are generally much more complicated if the leak is spraying water on other heat transfer surfaces within the HRSG. Apart from the physical damage potential of the leak, it will tend to drastically reduce the heat absorption in adjacent economizer tubes which are being sprayed by the leak. Addressing this by analysis is very difficult.
You probably get a reasonably accurate indication of Heat Rate impacts by using station metering of fuel flow, depending on the calibration of your flowmeters.