System configuration studies on gas turbine combined cycle power plants - application to processes of high pressure heat recovery steam generator for carbon capture system

Abstract

In the design of combined cycle power plants, the design parameters considered mainly could be changed and added for performance evaluation with change on the design objective and method. Therefore, the design criteria considering the different objectives and type of power plant was needed to suggest appro-priate design for the purpose. Thermodynamic and economic analyses of various types of gas turbine com-bined cycle power plants have been performed to establish criteria for optimization of power plants. The con-cept of efficiency, in terms of the difference in energy levels of electricity and heat, was introduced. The effi-ciency of power and heat generation by power plants with other purposes was estimated, and power genera-tion costs were figured out for various types of combined heat and power plants (i.e., fired and unfired, con-densing and non-condensing modes, single or double pressure HRSG). In addition to this, the combined cycle power plants with carbon capture from high pressure level of flue gas were introduced as a new demand on the system. The efficiency and costs of power generation were derived according to different flue gas pressure level and solvent material.