HC Dew Point Temperature vs Stream Temperature of Fuel Gas
HC Dew Point Temperature vs Stream Temperature of Fuel Gas
(OP)
Hi All,
From the fuel gas system HYSYS model I developed, I noticed that the HC dew point of the gas @ stream condition is 62.22 deg.F. The stream condition are temperature @62.23 deg.F and pressure @ 250 psig. The fluid is a fuel gas to be supplied to a GTG.
1) Would this close HC dew point temperature to stream temperature affect the property of the fuel gas to the GTG?
2) Should I consider the installation of a heater to increase the flow temperature when the FG condition required by the GTG is within the range of 45.8 - 48 deg.F and 242 - 250 psig?
From the fuel gas system HYSYS model I developed, I noticed that the HC dew point of the gas @ stream condition is 62.22 deg.F. The stream condition are temperature @62.23 deg.F and pressure @ 250 psig. The fluid is a fuel gas to be supplied to a GTG.
1) Would this close HC dew point temperature to stream temperature affect the property of the fuel gas to the GTG?
2) Should I consider the installation of a heater to increase the flow temperature when the FG condition required by the GTG is within the range of 45.8 - 48 deg.F and 242 - 250 psig?
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RE: HC Dew Point Temperature vs Stream Temperature of Fuel Gas
depending from amount of condensate the properties (composition of vapor phase, density, viscosity) may change, the condensate may also cause problems in a line designed for vapor phase,
if the amount of condensate is very low perhaps you can separate the liquid, differently a heater or different unit.
RE: HC Dew Point Temperature vs Stream Temperature of Fuel Gas
Your engineering specs will prpably have something on margin for fuel gas wrt dew point. Choke back pressure and usually you will see some condensation - and then your FG will once again be "wet", compress it and usually it will superheat somewhat - but not so much as to prevent condenasation if you cool it afterwards to a "Normal" temerature.