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

Authors

  • Phongthon Buntarikpornpant Chulalongkorn University
  • Chittin Tangthieng Chulalongkorn University

DOI:

https://doi.org/10.4186/ej.2020.24.1.11

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

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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.