Thesis /

ROMDOC-THESIS-2017-1099

Contribuţii la studiul instalaţiilor de ardere în strat fluidizat circulant cu captarea CO2

Negoi, Ramona-Mihaela
2011-09-06

Abstract: PhD dissertation title: Contribution to the study of Circulating Fluidized Bed Combustion with CO2 capture Abstract Over the last years, extensive efforts have been carried out for carbon dioxide (CO2) emissions mitigation, gas considered to have a major contribution to global mean land-ocean temperature increase and climate change. Carbon dioxide capture and storage (CCS) is one among different complementary technologies that are taken into consideration in order to meet the European Union targets. Post-combustion CO2 capture by chemical absorption seems to be a good option for retrofitting power plants. This work studies through numerical simulations and experimental tests the monoethanolamine (MEA) absorption process as an efficient way to remove CO2 and other pollutants from flue gases resulted from combustion of coal and co-combustion of coal and biomass in a bench-scale installation from University Politehnica of Bucharest, Faculty of Power Engineering. The main original idea of this doctoral dissertation is to combine the integration of waste heat of flue gases and the use of high concentrated MEA solvents in order to reduce the thermal heat requirements for solvent regeneration. These ideas have been suggested as a review of opened scientific literature that proposes the use of waste heat of flue gases for different processes like desalination and presents the development of highly efficient inhibitors that can be used to avoid the amine degradation reactions, even for high concentrations as 40%MEA. Using Aspen Plus 7.1. software and as input data values similar with the ones that characterize the experimental installation, three equilibrium based configurations for CO2 capture with MEA have been developed. The results have been used to propose and make different modifications of the experimental installation, to plan the experiments and to appreciate the experimental results. The results obtained from numerical simulations are comparable with the obtained experimental results suggesting that Aspen Plus is a very useful tool to evaluate different parameters that influence the chemical processes that take place in the amine CO2 capture installations. The experimental results, obtained for different MEA concentrations show a significant CO2 emission (up to 85%), a solvent regeneration around 50%, and totally reduction of SO2 emissions traces. In the present thesis are presented as well the hypothesis made for the numerical simulations and for the evaluation and the interpretation of the experimental results and a series of suggestions for further processes efficiency improvement and requirement energy reduction

Keyword(s): Dioxid de carbon -- Captare şi stocare -- Teză de doctorat ; Ardere -- Emisii poluante -- Teză de doctorat
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