Thermodynamic Analysis of a Semi-Closed Oxy-fuel Combustion Combined Cycle

Year 2022, Volume: 25 Issue: 1, 86 - 94, 01.03.2022

Rafael Pinho Furtado , Reynaldo Palacios Bereche André Damıanı Rocha Antonio Gallego

https://doi.org/10.5541/ijot.961067

Cited By: 2

Abstract

Semi-closed oxy-fuel combustion combined cycle (SCOC-CC) is a strong concept of carbon capture and storage (CCS) in gas-fired power plants. This technology is similar to a conventional combined cycle, however oxygen instead of air is used in fuel combustion. In the oxy-fuel combined cycle, the gas turbine flue gases consist mainly of CO2 and H2O. One of the problems to implement this technology is the necessity of an air separation unit (ASU) to separate the oxygen from the air, which increases the energy consumption of the power plant. Thus, a comparative thermodynamic analysis was performed between a conventional combined cycle (base case) and an oxy-fuel combined cycle. The objective is to identify each technology's pros and cons, the influence of oxygen purity in the oxy-fuel combine cycle, and the main irreversibilities of each case. The SCOC-CC optimal operating point (maximum energy efficiency) was found utilizing particle swarm optimization (PSO), which lead to the optimal ASU oxygen purity of 95.99%. It was noticed that the oxy-fuel combined cycle first law efficiency is 6.9% lower than the base case, and the second law efficiency is 6.5% lower. Despite the efficiency loss the SCOC-CC is more environmentally friendly than the conventional combined cycle since it can theoretically capture all CO2 produced in the combustion chamber.

Keywords

Oxy-fuel, SCOC-CC, Thermodynamic analysis, CSS, PSO

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