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Chapter 5 Conclusions and recommendations Conclusions In this work, a design methodology for supercritical carbon dioxide power plants which inte- grates the thermodynamic analysis and the design of the individual components of the system has been developed. Supercritical CO2 systems are a very attractive option because of their advantages like small equipment and high conversion efficiencies at moderate turbine inlet temperatures. The present study develops a innovative procedure that allows to couple and parametrize simultaneously the thermodynamic analysis and the components design. A preliminary thermodynamic analysis is developed for three system configurations, a Brayton regenerative, a Brayton recompression and a Rankine system. The targets of the analysis are the thermal efficiency and the power output, which are set to 50% and 18.7 MW respectively. The effects of the performance and operating conditions in the components of the system are evaluated in terms of turbine inlet temperature and regeneration load. It is observed that for a constant pressure loss the turbine inlet temperature as function of the compressor discharge pressure presents a minimum. It is possible then to obtain the minimum TIT and its correspondent system pressure as a function of the pressure loss. It is shown then that the recompression system requires the lowest discharge pressures to achieve the minimum TIT. Among the three, the Rankine configuration presents the best characteristics in terms of TIT, pressure system, regeneration load, and CO2 mass flow. However, this system has been studied for the specific case of aerospace applications and takes advantage of a very low condensing temperature (-20◦C), which makes it hardly feasible for stationary power generation, unless a mixture working fluid is adopted in order to obtained the desired critical point. The recompression system is therefore the best available option for power generation since it presents lower TITs and lower pressures than the regenerative system. However, the CO2 mass flow and regeneration load present larger values than the regenerative system, leading to larger equipment. Master of Science Thesis J.S. Bahamonde NoriegaPDF Image | Design method for s-CO2 gas turbine power plants
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