ch15 - 15-1 CHAPTER 15 SOLUTIONS Exercise 15.1 Liquid...

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Unformatted text preview: 15-1 CHAPTER 15 SOLUTIONS Exercise 15.1 Liquid Oxygen PumpPage 1 The following results were obtained with the ChemCad simulator. They do not include the calculation of the NPSH, which follows in a hand calculation. CHEMCAD 5.2.3 FLOWSHEET SUMMARY Equipment Label Stream Numbers 1 PUMP 1 -2 Stream Connections Stream Equipment From To 1 1 2 1 Calculation mode : Sequential Flash algorithm : Normal Equipment Calculation Sequence 1 No recycle loops in the flowsheet. COMPONENTS ID # Name 1 47 Oxygen THERMODYNAMICS K-value model : Ideal Vapor Pressure Enthalpy model : Latent Heat Liquid density : Library 15-2 Exercise 15.1 Liquid Oxygen PumpPage 2 EQUIPMENT SUMMARIES Pump Summary Equip. No. 1 Name Output pressure psia 300.0000 Efficiency 0.8000 Calculated power hp 121.5460 Calculated Pout psia 300.0000 Head ft 534.4359 Vol. flow rate ft3/hr 5041.8481 Mass flow rate lb/sec 100.0000 STREAM PROPERTIES Stream No. 1 2 Name Feed Discharge - - Overall - - Mass flow lb/sec 100.0000 100.0000 Temp F -298.0000 -295.8789 Pres psia 35.0000 300.0000 Vapor mole fraction 0.0000 0.0000 Std. sp gr. wtr = 1 1.128 1.128 Actual dens lb/ft3 71.4024 71.0340 Actual vol ft3/hr 5041.8481 5067.9966 Viscosity, cP 0.1948 0.1931 From the above, Bhp = 121.5 Dischargetemperature=-295.9oF (2.1oF higher than the feed) Calculation of the NPSH following the procedure in Example 16.5, as mentioned on page 463: For a 10-ft elevation of the level in the tank and a liquid density of 71.4 lb/ft3, the pressure at the pump suction is 35 + 10(71.4)/144 = 35 + 5 = 40 psia. From ChemCad, the vapor pressure of oxygen at 298oF = 14.13 psia Available NPSH = (40 14.13)(144)/71.4 = 52 ft. 15-3 Exercise 15.2 Multistage Gas CompressionPage 1 A three-stage compression system is required to avoid compressor discharge temperatures greater than 400oF. The following is a ChemCad solution that assumes intercooler pressure...
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ch15 - 15-1 CHAPTER 15 SOLUTIONS Exercise 15.1 Liquid...

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