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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 45628 (06)
- University: Sharif University of Technology
- Department: Petroleum and Chemical Engineering Faculty
- Advisor(s): Farhadi, Fatolah
- Abstract:
- A brass vortex tube (VT) with changeable parts is used to investigate the effect of nozzle intakes number and diameter, distance between cold end orifice and nozzle intakes, cold end orifice diameter, main tube length and diameter on inlet, cold and hot exit temperature difference, isentropic efficiency and Coefficient of Performance. A series of experiments conducted to investigate the inlet pressure and cold fraction effect on VT performance and an optimum amount for this parameter is found. The separation performances of a VT for a hydrocarbon mixture is also investigated. Effects of nozzle intakes number and cold fraction on the gas species separation at specific inlet pressure in a VT with two gas mixtures (LPG as a hydrocarbon mixture and LPG-N2) were examined. A two- dimensional computational fluid dynamics simulation of a VT was performed. Finally, some results of the CFD models are validated by the available experimental data, showing reasonable agreement for future development. A comparison between a distillation column and a cascade of 7 VTs providing similar hydrocarbon mixture separation is presented. Stage efficiencies for both distillation column and cascaded VTs, along with respective capital and operational expenditures are calculated and compared. It is shown that a VT cascade is quite more advantageous
- Keywords:
- Gases Separation ; Vortex Tubes ; Geometry Optimization ; Recovery ; Liquid Petroleum Gas (LPG) ; Liquid Petroleum Gas (LPG)Recovery ; Ranque-Hilsch Vortex Tube
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