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Session: Poster session & Sponsor Exhibition
Session starts: Monday 07 October, 14:00

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Hyung-Chul Jung (University of Canterbury)
Susan Krumdieck (University of Canterbury)

Abstract:
In the present study, design and analysis of an organic Rankine cycle (ORC) system and radial inflow turbine is presented for a 250 kW pilot binary cycle power plant to recapture low-grade waste heat released from a petroleum refining process. A total of 12 pure fluids and mixtures are investigated. The refinery heat source is in a kerosene liquid stream with a flow rate of approximately 6000 ton/day at a temperature range of 105 – 140C. The thermodynamic analysis of the ORC is first performed to determine its operating conditions. They are then used as requirements for the preliminary aerodynamic design of a radial turbine for the system. The aerodynamic analysis is based on both the dimensionless parameters, such as the specific velocity and the specific diameter, and the stage loading and flow coefficients. The numerical turbine model developed is validated against experimental data from published literature. Turbine stage efficiency is estimated by means of the rotor flow loss models. Results show that the kerosene stream flow rate needed and the turbine size significantly vary according to working fluids – the flow rates range from about 3070 to 3730 t/d and the rotor blade tip diameter about 0.20 to 0.43 m. Overall, less flow rates and smaller sizes are required for the mixtures than the pure fluids. The turbine design results obey the geometric, flow, structural and vibration design criteria proposed by researchers. The determined geometric and aerodynamic parameters of the turbine stage are considered beneficial for a detailed analysis of the turbine.