A Parametric Investigation of the Steam Injection Gas Turbine System on a Cogeneration Plant

  • Phongthon Buntarikpornpant Chulalongkorn University
  • Chittin Tangthieng Chulalongkorn University
Keywords: parametric study, cogeneration plant, steam injection gas turbine, primary energy saving

Abstract

The aim of this study is to conduct a parametric investigation of the steam injection gas turbine system by focusing on the effect of the steam mass flow rate on the energy transfer behaviors of a cogeneration plant.  A thermodynamic model of two gas turbine cycles and one steam turbine cycle and a heat transfer model of the heat recovery steam generator are developed.  A successive iteration is employed to solve a set of equations and obtain a converged solution.  The result shows that by increasing the mass flow rate for the steam injection gas turbine system from 0 to 2 kg/s, the input energy rate from the fuel and the total electrical output power from the cogeneration plant are increased, resulting in an increase of the cogeneration electrical efficiency from 49.9% to 50.4%.  On the other hand, the output heat rate from the steam from the cogeneration plant is decreased, resulting in a decrease of the cogeneration heat efficiency from 8.5% to 5.4%.  Consequently, the primary energy saving of the cogeneration plant decreases from 16.6% to 14.9%. 

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Author Biographies

Phongthon Buntarikpornpant

Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University, Pathumwan, Bangkok, Thailand

Chittin Tangthieng

Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University, Pathumwan, Bangkok, Thailand

Published In
Vol 24 No 1, Feb 8, 2020
How to Cite
[1]
P. Buntarikpornpant and C. Tangthieng, “A Parametric Investigation of the Steam Injection Gas Turbine System on a Cogeneration Plant”, Eng. J., vol. 24, no. 1, pp. 11-21, Feb. 2020.