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A novel blend, CARSOXY, as a working fluid for advanced gas turbine cycles

Al-Doboon, Ali 2019. A novel blend, CARSOXY, as a working fluid for advanced gas turbine cycles. PhD Thesis, Cardiff University.
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Fossil-fuel-fired gas turbines continue to be the most reliable and cost-effective power production method. Turbines running with natural gas are considered to be one of the cleanest fossil-fuel-based engines in terms of carbon emissions. Nevertheless, CO2 and other pollutants emitted from this type of power generation contribute to global environmental deterioration. This has led to the development of innovative and efficient approaches to producing energy through fossil fuels. The main challenge when implementing these new technologies is providing the equivalent performance to current systems running with conventional methods while reducing harmful emissions. Carbon Capture and Storage (CCS), Oxyfuel (OF) combustion, humidified gas turbines and closed cycles running with inert gases are the most well-known of these technologies. The novel approach proposed in this study is to combine the above methods to attempt to produce a gas blend consisting of Co2, ARgon, Steam and OXYfuel (CARSOXY) that could replace conventional air as a working fluid. This study employs theoretical methods, which include Gaseq, Minitab and Chemkin-Pro, to identify the optimum novel blend. Then, a bespoke numerical simulation test of the feasibility of running the novel blend in a real industrial gas turbine is conducted. The performance of the proposed cycle is also numerically examined using Aspen Plus. A central diffusive burner is utilised for experiments to demonstrate the applicability of the optimum blend in industrial gas combustors. Findings indicate that CARSOXY could be used as a realistic replacement for air as a working fluid in gas combustors because it has similar characteristics and produces higher efficiency while eliminating NOx and recycling CO2 in the combustion process. From a practical point of view, the combustion process when running the proposed blend is shown to be more stable than when running air, with lower emission levels.

Item Type: Thesis (PhD)
Date Type: Submission
Status: Unpublished
Schools: Engineering
Uncontrolled Keywords: Humidified gas turbines; Oxyfuel in gas turbines, CCS for gas turbine; Performance of gas turbine cycles; Flame spectral analysis; Aspen plus for gas turbine; Allam cycle; Gas turbine combustion process.
Date of First Compliant Deposit: 6 June 2019
Last Modified: 01 Feb 2021 16:32

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