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Oxy-combustion Modeling

Świątkowski B., Kuczyński P. M.

Archivum Combustionis

2009

Vol. 29 nr 3-4

153-162

Carbon dioxide is regarded to be the dominant contributor to the greenhouse effect. It is being released mainly during combustion of fossil fuels. A number of leading countries enforced lowering CO2 emissions by legal means. Poland is an example of country, in which 90% of electric power is generated in coal-combusting installations. Therefore, aiming to meet the carbon dioxide emission norms it is necessary to develop and implement Carbon Capture and Storage technology. One of the most promising is coal combustion in atmospheres rich in oxygen, so called oxy-combustion. The main advantages of this technology are possibility of implementation to existing facilities – retrofitting and better potential of capturing CO2, because the exhaust gases contain almost pure carbon dioxide. Thus intensive research is being conducted all over the world, as well as in Poland, in order to develop oxy-combustion. Computational Fluid Dynamics is a powerful tool supporting the design and pilot scale stages for new technologies. This paper presents models, which are used in numerical simulations of pulverized coal combustion. The goal was to investigate whether those methods are applicable to its combustion in atmospheres rich in O2 and CO2, as they are for air. Therefore a number of simulations was run, in which different models were tested. The problems encountered during the modeling were emphasized. The experimental stand installed in the Institute of Power Engineering was a reference to the simulations results.