Quasi Three-Dimensional Design for a Novel Turbo-Vapor Compressor and  the Last Stage of a Low-Pressure Steam Turbine

Amin Mobarak; Mostafa Shawky Abdel Moez; Shady Ali

Authors

Amin Mobarak Mechanical Power Engineering Department, Faculty of Engineering, Cairo University, Egypt
Mostafa Shawky Abdel Moez Mechanical Power Engineering Department, Faculty of Engineering, Cairo University, Egypt
Shady Ali Mechanical Power Engineering Department, Faculty of Engineering, Cairo University, Egypt

Keywords:

Freshwater and electricity production, turbo-vapor compressor, low-pressure steam turbine

Abstract

Turbo-vapor compressors (TVCs) are used to create a vacuum pressure in the evaporator of a novel combined cycle for electricity and freshwater production were invented. A novel design conceived of a TVC is introduced to increase the efficiency, allowable mass flow rate and reduce costs and losses. The system consists of a single axial compressor rotor followed by a single axial turbine rotor which drives the upstream compressor, allowing high flow rates. A quasi-3D design is carried out for the TVC to calculate the flow velocity components and angles and ensure that the turbo?vapor turbine work is equal to the turbo-vapor compressor work. A preliminary design of the low-pressure power turbine (LPT) is done to examine the size and number of stages. The (LPT) size is twice the size of TVC at typical cycle operating conditions. A three-stage design is the most appropriate choice for the number of stages. It satisfies the accelerating relative flow condition at the last stage over a range of flow coefficients. A quasi-3D design is carried out for the LPT's last stage to ensure a multi?stage power turbine's safe design.