New correlations for the weighted-sum-of-gray-gases model in oxy-fuel conditions based on HITEMP 2010 database

Kangwanpongpan, Tanin; França, Francis; Silva, Rodrigo Corrêa da; Schneider, Paulo Smith; Krautz, Hans Joachim

doi:10.1016/j.ijheatmasstransfer.2012.07.032

Cited by 126 publications

(83 citation statements)

References 32 publications

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“…The calculations of the number density, line intensity and line shape function are presented in several prior works [22][23][24]. This study follows the work of Kangwanpongpan et al [24] using the same spectral resolution of 0.067 cm -1 for the LBL calculations between 0.2 and 10.000 cm -1 . The computational demand for solving the RTE depends on the spectral resolution.…”

Section: Line-by-line Calculationsmentioning

confidence: 98%

“…The weighting function is normally fitted by a polynomial function dependent on temperature. This work uses the same method as [24,26] by normalizing the fitting coefficients with a reference temperature, T ref at 1,200 K, as…”

Section: Weighted Sum Of Grey Gas Model Calculationsmentioning

confidence: 99%

“…The desired Planck mean coefficient can therefore be taken from the base case, Table 1, and then multiplied by the ratio between the actual load and the base case load. For the WSGG including particles the same method as used in [24,26] for variable molar ratios for H 2 O to CO 2 was applied for variable particle loads. With 6.5 g/Nm 3 being the base case, load = 1, six other sets of coefficients were produced for the coal and biomass ash particles at [0.1, 0.25, 0.75, 1.5, 2.0] times the base load.…”

Section: Weighted Sum Of Grey Gas Model Calculationsmentioning

confidence: 99%

“…2a, b the source terms are presented for nonisothermal plane-parallel cases with the distance of 1 m and 10 m, see Fig. 8b, d in [24], respectively. The validation of the creation of WSGG coefficients is presented together with the LBL calculations in Fig.…”

Section: Weighted Sum Of Grey Gas Model Calculationsmentioning

confidence: 99%

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Evaluation of Planck mean coefficients for particle radiative properties in combustion environments

Hofgren

Sundén

2014

Heat Mass Transfer

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Thermal radiation is the dominating form of heat transfer in several combustion technologies that combust solid fuels, such as pulverized coal combustion and fixed bed combustion. The thermal radiation originates from the hot combustion gases and particles. For accurate modelling of thermal radiation in these environments the selection of the radiative transport model and radiative property model is important. Radiative property models for gases have received huge attention and several well documented models exist. For particles, soot has received considerable attention whereas other particles have not to a similar extent. The Planck mean coefficients are most commonly used to describe the radiative properties of the particles. For gases the Planck mean absorption coefficient is known to give large deviations from recognised exact models in predicting the radiative heat transfer. In this study the use of Planck mean coefficients for particles are investigated and compared to spectral models. Two particle mass size distributions of fly ash are used, representing biomass and coal combustion. The evaluation is conducted in several combustion-like test cases with both gases and particles. The evaluation shows that using Planck mean coefficients for particles, in combustion-like situations, can give large errors in predicting the radiative heat flux and especially the source term. A new weighted sum of grey gas approach is tested and evaluated. It includes both the particles and gases to better account for the non-greyness of the fly ash absorption coefficient.

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Section: Line-by-line Calculationsmentioning

confidence: 98%

Section: Weighted Sum Of Grey Gas Model Calculationsmentioning

confidence: 99%

Section: Weighted Sum Of Grey Gas Model Calculationsmentioning

confidence: 99%

Section: Weighted Sum Of Grey Gas Model Calculationsmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of Planck mean coefficients for particle radiative properties in combustion environments

Hofgren

Sundén

2014

Heat Mass Transfer

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“…This approach usually yields satisfactory results in standard air-combustion [3] and is thus also suggested by the TNF workshop [1]. As a second model, the P1 approximation [34] combined with the weighted sum of gray gases (WSGG) [21] using the weights from [24] is used. The latter has already been successfully applied in oxy-fuel combustion [17].…”

Section: Laminar Flamementioning

confidence: 99%

A Combined Experimental and Numerical Study of Laminar and Turbulent Non-piloted Oxy-fuel Jet Flames Using a Direct Comparison of the Rayleigh Signal

Hunger

Zulkifli

Williams

et al. 2015

Flow Turbulence Combust

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New weighted-sum-of-gray-gases model for typical pressurized oxy-fuel conditions

et al. 2017

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Summary Pressurized oxy‐fuel combustion technology has received considerable attention due to its ability to improve the overall system efficiency and to control CO2 emissions. The characteristics of radiation heat transfer are significant for pressurized oxy‐fuel gas mixture and different from those under atmospheric conditions. Therefore, to calculate the radiation characteristics of pressurized oxy‐fuel gas mixture quickly and accurately, new weighted‐sum‐of‐gray‐gases (WSGG) model for pressurized oxy‐fuel conditions was first presented in this paper, which was applied in 3 typical high pressure conditions: 5, 10, and 15 bar. The new WSGG model correlations were suitable for pressurized conditions with a molar ratio range of 0.125‐2, temperature range of 400‐2500 K, and path length range of 0.1‐20 m. Calculations for a variety of typical pressurized oxy‐fuel combustion cases showed that the new WSGG model can accurately predict the radiation characteristics and heat transfer characteristics of the gas mixtures compared with the SNB model benchmark. In addition, the application of the previous atmospheric WSGG models yielded non‐ideal results under pressurized conditions. Consequently, the new model can provide efficient and accurate radiation heat transfer results for pressurized oxy‐fuel conditions and can be used to design pressurized oxy‐fuel combustion furnaces or boilers.

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New correlations for the weighted-sum-of-gray-gases model in oxy-fuel conditions based on HITEMP 2010 database

Cited by 126 publications

References 32 publications

Evaluation of Planck mean coefficients for particle radiative properties in combustion environments

Evaluation of Planck mean coefficients for particle radiative properties in combustion environments

A Combined Experimental and Numerical Study of Laminar and Turbulent Non-piloted Oxy-fuel Jet Flames Using a Direct Comparison of the Rayleigh Signal

New weighted-sum-of-gray-gases model for typical pressurized oxy-fuel conditions

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