Oxycombustion

Résumé

Un procédé d'oxycombustion est une combustion où l'on utilise directement du dioxygène (O2) comme comburant plutôt que simplement de l'air. En excluant l'azote de la combustion, la température de flamme augmente significativement et on limite la quantité de fumée générée, ainsi que la production de NOx. On parle souvent d'oxy-combustion dès que le taux d'oxygène du comburant dépasse 90-95 %, taux qui suffit à produire des fumées souvent près de 10 fois plus riches en que les fumées de post-combustion conventionnelle . Application au captage du dioxyde de carbone Introduction Les combustibles fossiles contiennent essentiellement du carbone (C), de l'hydrogène (H) et en plus faibles proportions de l'oxygène (O), de l'azote (N), du soufre (S) et des traces de divers autres éléments. Lorsque ces combustibles sont brûlés dans l'air (composé de diazote () pour environ 79 % et de dioxygène () pour environ 21 %), ce dernier réagit avec les composants du combustibl

Source officielle

https://fr.wikipedia.org/wiki/Oxycombustion

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Thermo-economic analysis and modeling of oxyfuel processes

Within the goal of reducing the atmospheric CO2 emissions, CO2 capture and storage (CCS) is regarded as a promising option. For CO2 capture different concepts are investigated; post-combustion, pre-combustion and oxyfuel-combustion (pure O2 oxidation). Here the oxy-fuel combustion is studied in detail. Compared to the other CO2 capture concepts the CO2 separation from the exhaust gas containing mainly H2O and CO2 is easier to perform, however an air separation unit is required. The objective is study the oxyfuel process in detail by developing a thermo-economic model to assess the performance and make a comparison of the competitiveness of different CO2 capture concepts.

2012

Chargement

Thermo-economic evaluation of coal power plants with CO2 capture

Jeremy Urech

Actually the world is facing the dual challenge of energy supply security and mitigating climate change due to greenhouse gas emissions. In this context different alternatives to reduce the atmospheric CO2 emissions are increasing the efficiency, switching to renewable resource and reduce emissions from fossil resources by CO2 capture and storage (CCS) . In power plants three different CCS concepts have emerged: post-combustion applying an end of pipe technology to remove CO2, oxy-fuel combustion (i.e. pure O2 oxidation) and pre-combustion (i.e. H2 routes). Coal power plants are supplying a large amount of the world's electricity and contributing to the CO2 emissions increase. The goal of the project is to study the performance of coal power with CO2 capture and to assess the energy penalty and cost of capturing CO2.

2011

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Thermo-economic analysis of chemical looping processes

Amélie Courjon

Among the different ways of capturing carbon dioxide in industrial processes, chemical looping process is presented as an improvement in oxy-fuel combustion. Since carbon dioxide is directly generated with water in the process, there is no need of an additional, expensive capture system, which is always high energy consumer. The objective is to evaluate how chemical looping advantages in carbon dioxide capture can be adapted to hydrogen and power cogeneration. Methane is used as incoming energy source, and is associated to iron and its oxide magnetite as oxygen carrier. A thermo-economic model of the process including a thermo-dynamic model and an energy integration model is developed to evaluate the process performance with regard to costs and energy efficiency. From the sensitivity analysis and optimization, optimal operating conditions taking into account investment, production costs and efficiency are assessed in a next step.

2010

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