E
What are the reasons for high temperature in atomizing air piping in gas turbine GE 9E
Eng.Engineer,
This is not the first time you have posted here on control.com where we ask people to provide as much information as possible to provide the best and most concise replies in the shortest possible time.
<b>HAVE YOU LOOKED AT THE ATOMIZING AIR PIPING SCHEMATIC (P&ID) TO SEE IF THERE ARE COOLERS WHERE YOU *suspect* A "high" TEMPERATURE? AND IF SO, HAVE YOU VERIFIED THE COOLERS ARE WORKING PROPERLY?
HAVE YOU READ THE NOTES ON THE PIPING SCHEMATIC (P&ID) DRAWINGS TO SEE IF THE ANSWERS TO YOUR QUESTIONS ARE LISTED THERE?
HAVE YOU REFERRED TO THE DEVICE SUMMARY DRAWING TO SEE WHAT INFORMATION IS PROVIDED ABOUT THE MAIN ATOMIZING AIR COMPRESSOR INLET AND OUTLET TEMPERATURES?
HAVE YOU USED THE 'Search' FEATURE OF CONTROL.COM TO SEE IF THERE HAVE BEEN ANY OTHER POSTS ABOUT ATOMIZING AIR SYSTEMS ON GE-DESIGN HEAVY DUTY GAS TURBINES TO SEE IF THERE IS ANY RELEVANT INFORMATION IN THOSE OTHER POSTS? (Because there has been a series of posts in the past couple of weeks!)</b>
WHAT DO YOU MEAN BY "HIGH" TEMPERATURE?
IS THE "HIGH" TEMPERATURE ON THE INLET TO THE ATOMIZING AIR COMPRESSOR (WHERE THE ALARM TEMPERATURE SWITCH IS LOCATED) OR THE DISCHARGE OF THE ATOMIZING AIR COMPRESSOR?
The temperature of the air entering the Main Atomizing Air Compressor should be less than approximately 275 deg F and I believe the setpoint for the temperature regulating valve on the cooler of the Main AA Compressor inlet air is to be set for 225 deg F. The minimum temperature of the air entering the Main AA Compressor should be about 195 deg F (because if the air is too cool there could be condensate/liquids entering the compressor). The Main AA Compressor spins at many tens of thousands of RPM (which can be determined from the nameplate on the compressor, where other useful information can also be found) and sometimes is also listed on the Device Summary drawing. (The most recent post described above had the originator responding that the Main AA Compressor on the unit at his site operated at 50100 RPM!)
When any gas (air is a gas) is compressed, its temperature increases. Per the AA Piping Schematic drawing, there is no cooler on the air exiting the Main AA Compressor so the temperature is what it is. Why would it be necessary to cool the air before it enters the combustor where it's going to be heated again? And to heat that air that was cooled is going to take more fuel, which is going to decrease the efficiency of the process.
So, where are you observing this "high" temperature and what is the magnitude of the "high" temperature you are observing?
This is not the first time you have posted here on control.com where we ask people to provide as much information as possible to provide the best and most concise replies in the shortest possible time.
<b>HAVE YOU LOOKED AT THE ATOMIZING AIR PIPING SCHEMATIC (P&ID) TO SEE IF THERE ARE COOLERS WHERE YOU *suspect* A "high" TEMPERATURE? AND IF SO, HAVE YOU VERIFIED THE COOLERS ARE WORKING PROPERLY?
HAVE YOU READ THE NOTES ON THE PIPING SCHEMATIC (P&ID) DRAWINGS TO SEE IF THE ANSWERS TO YOUR QUESTIONS ARE LISTED THERE?
HAVE YOU REFERRED TO THE DEVICE SUMMARY DRAWING TO SEE WHAT INFORMATION IS PROVIDED ABOUT THE MAIN ATOMIZING AIR COMPRESSOR INLET AND OUTLET TEMPERATURES?
HAVE YOU USED THE 'Search' FEATURE OF CONTROL.COM TO SEE IF THERE HAVE BEEN ANY OTHER POSTS ABOUT ATOMIZING AIR SYSTEMS ON GE-DESIGN HEAVY DUTY GAS TURBINES TO SEE IF THERE IS ANY RELEVANT INFORMATION IN THOSE OTHER POSTS? (Because there has been a series of posts in the past couple of weeks!)</b>
WHAT DO YOU MEAN BY "HIGH" TEMPERATURE?
IS THE "HIGH" TEMPERATURE ON THE INLET TO THE ATOMIZING AIR COMPRESSOR (WHERE THE ALARM TEMPERATURE SWITCH IS LOCATED) OR THE DISCHARGE OF THE ATOMIZING AIR COMPRESSOR?
The temperature of the air entering the Main Atomizing Air Compressor should be less than approximately 275 deg F and I believe the setpoint for the temperature regulating valve on the cooler of the Main AA Compressor inlet air is to be set for 225 deg F. The minimum temperature of the air entering the Main AA Compressor should be about 195 deg F (because if the air is too cool there could be condensate/liquids entering the compressor). The Main AA Compressor spins at many tens of thousands of RPM (which can be determined from the nameplate on the compressor, where other useful information can also be found) and sometimes is also listed on the Device Summary drawing. (The most recent post described above had the originator responding that the Main AA Compressor on the unit at his site operated at 50100 RPM!)
When any gas (air is a gas) is compressed, its temperature increases. Per the AA Piping Schematic drawing, there is no cooler on the air exiting the Main AA Compressor so the temperature is what it is. Why would it be necessary to cool the air before it enters the combustor where it's going to be heated again? And to heat that air that was cooled is going to take more fuel, which is going to decrease the efficiency of the process.
So, where are you observing this "high" temperature and what is the magnitude of the "high" temperature you are observing?
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