Note that I broke the recycle after the boiler. While not really necessary, it does make life easier. I used three design specs in this problem. The closed.

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Presentation transcript:

Note that I broke the recycle after the boiler. While not really necessary, it does make life easier. I used three design specs in this problem. The closed feed water heater was specified to have condensate (from the extraction port --vapor fraction =0) leaving the heater. DS-1 then controls the split to give the 5 C difference between the condensate and the boiler feed water. DS-2 controls the flow in the feed stream to give 75 MW DS-3 controls the split from the second extraction port to give a zero heat duty in the flash tank which I used as the open feed water heater. By specifying 0 vapor fraction, the flash model computes the heat duty necessary to have all inputs leave as a liquid. DS-3 then controls the split to give a zero heat duty. The result of all this is an overall thermal efficiency of just over 32 %

Steam to 1st Turbine Total Flow kmol/sec4.6 Total Flow kg/sec83.7 Temperature C500 Pressure kPa4000 Vapor Frac1 Liquid Frac0 Split to closed preheater Split to open preheater Work, Turbine MW Work, Turbine MW Work, Turbine MW Work, Hi Pres. Pump0.4261MW Work, Lo Pres. Pump0.0090MW Net Work-75.00MW Boiler Heat Duty MW Condenser Duty-157Mw

Stream Table WATER Total Flow kmol/hr Total Flow kg/hr Temperature K Pressure atm Vapor Frac Liquid Frac FRMBOILRHIPSTMREGEN-1REGEN-2REGNLOTTOBOILER WATER Total Flow kmol/hr Total Flow kg/hr Temperature K Pressure atm Vapor Frac Liquid Frac