Volume 3: Combustion, Fire and Reacting Flow; Heat Transfer in Multiphase Systems; Heat Transfer in Transport Phenomena in Manu 2009
DOI: 10.1115/ht2009-88392 View full text |Buy / Rent full text
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Abstract: The reduction of greenhouse gas emissions is essential to mitigate the impact of energy production from fossil fuels on the environment. Oxyfuel technology is a process developed to reduce emissions from power stations by removing nitrogen from air and burning the fossil fuels in a stream of pure oxygen. The remaining oxidiser is composed of recycled flue gas from the furnace to reduce temperatures. The product of this system is a flue gas with very high carbon dioxide concentration enabling more efficient cap… Show more

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“…The nongray WSGG model agrees well with the reference model and should therefore give a sufficient measure of the influence of gaseous radiation in the CFD simulations. The gray WSGG model is, on the other hand, not able to capture the variations of the source term, a result in line with the work of Porter et al Neither the positive absorption peak at 0.2 m from the wall nor the negative emission peak are predicted accurately by the gray model. The results of the air case (Figure b) are in general similar to the results of the OF 27 case.…”
Section: Resultssupporting
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“…The nongray WSGG model agrees well with the reference model and should therefore give a sufficient measure of the influence of gaseous radiation in the CFD simulations. The gray WSGG model is, on the other hand, not able to capture the variations of the source term, a result in line with the work of Porter et al Neither the positive absorption peak at 0.2 m from the wall nor the negative emission peak are predicted accurately by the gray model. The results of the air case (Figure b) are in general similar to the results of the OF 27 case.…”
Section: Resultssupporting
“…With respect to computational fluid dynamics (CFD) modeling, which is the focus of this work, there are some studies where the spectral properties of the gases have been considered, , but very few on radiation in oxy-fuel flames. In the work of Porter and co-workers, CFD calculations of temperature and incident radiation on fictive air and oxy-fuel flames were carried out using a gray WSGG model and the full-spectrum correlated k -distribution method (FSCK). Both methods gave similar temperature predictions for an oxy-fuel flame, but the FSCK method predicted a higher incident radiation than the gray model.…”
Section: Introductionmentioning
“…Air-derived global schemes have also been used to model the gas phase in oxy-fuel combustion. 8,9 The global scheme of Jones and Lindstedt 10 is of interest for oxy-fuel combustion, since it is the basis for all the above-mentioned oxy-fuel mechanisms. This paper aims to perform a thorough evaluation of three of the above-mentioned oxy-fuel mechanisms unchanged, since the combustion process is completed.…”
Section: ■ Introductionmentioning
“…The total emissivity is calculated using the WSGGM, and then a gray absorption coefficient is calculated by assuming a mean path length of radiation. For oxy-coal combustion, in addition to the gray model, a spectral model, the full spectrum k-distribution (FSK) method [20] for the gas properties has also been used [21][22]. This model was implemented in order to demonstrate the impact of the gas radiative properties on the results.…”
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