CFD and experimental analysis of a 115kW natural gas fired lab-scale furnace under oxy-fuel and air–fuel conditions

Mayr, Bernhard; Prieler, René Josef; Demuth, Martin; Potesser, Michael; Hochenauer, Christoph

doi:10.1016/j.fuel.2015.07.051

Cited by 47 publications

(14 citation statements)

References 40 publications

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“…The temperature range of the new WSGG model was selected as 400-2500 K because most of the oxy-fuel combustion furnace flue gas temperature concentrates in this range [38][39][40] ; the path length range is 0.1-20 m, which covers the dimensions of most oxy-fuel combustion furnaces at laboratory level, [40][41][42] pilot level, 39,43 and industrial level. 44,45 The range of the molar ratio M is 0.125-2; for dry flue gas recycle of oxy-fuel combustion, the flue gas is dried prior to being recycled; thus, the molar ratio M is below 1, and the typical molar ratios are 0.125, 0.25, 0.5, and 0.75; for wet flue gas recycle of oxy-fuel combustion, the molar ratio M is not below 1 because the flue gas has not been dried before recycle, and the typical molar ratios are 1 and 2.…”

Section: Wsgg Modelmentioning

confidence: 99%

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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Section: Wsgg Modelmentioning

confidence: 99%

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

et al. 2017

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“…The simulations, which were performed without considering the radiation effect, showed very high temperature and NO X emission levels, compared with the experimental results. Mayr et al investigated a lab‐scale furnace with a thermal input between 28 and 115 kW. They used natural gas as fuel in the lab‐scale furnace.…”

Section: Introductionmentioning

confidence: 99%

Study on nonpremixed methane/air combustion from flame structure and NO _X emission aspect for different burner head structures

Büyükakın

Öztuna

2019

Int J Energy Res

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Summary In the present study, the air turbulator, which is a part of a nonpremixed burner, is investigated numerically in terms of its effects on the diffusion methane flame structure and NOX emissions. A computational fluid dynamics (CFD) code was used for the numerical analysis. At first, four experiments were conducted using natural gas fuel. In the experimental studies, the excess air ratio was taken constant as 1.2, while the fuel consumption rate was changed between 22 and 51 Nm3/h. After the experimental studies, the CFD studies were carried out. Pure methane was taken as fuel for the simulations. The nonpremixed combustion model with the steady laminar flamelet model (SFM) approach was used in the combustion analyses. Methane‐air extinction mechanism with 17 species and 58 reactions was used for the simulations. The results obtained from the CFD studies were confronted with the measurements of the flue gas emissions in the experimental studies. Then, a modified burner head was analysed numerically for the different air turbulator blade numbers and angles. The CFD results show that increasing the air turbulator blade number and angle causes the thermal NO emissions to be reduced in the flue gas by making the flame in the combustion chamber more uniform than the original case. This new flame structure provides better mixing of the fuel and combustion air. Thus, the diffusion flame structure in the combustion chamber takes the form of the partially premixed flame structure. The maximum reduction in the thermal NO emissions in the flue gas is achieved at 38% according to the original case.

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“…The use of CFD techniques in modeling packed bed reformer, with hydrogen membrane, for both laboratory and industrial application has been widely reported. CFD studies have also been used to understand combustion dynamics in industrial furnaces . The study was carried out at different reformer pressures (RPs), gas hourly space velocities (GHSVs), steam to methane ratio, and excess air factor in the combustion zone.…”

Section: Introductionmentioning

confidence: 99%

“…CFD studies have also been used to understand combustion dynamics in industrial furnaces. 22,23 The study was carried out at different reformer pressures (RPs), gas hourly space velocities (GHSVs), steam to methane ratio, and excess air factor in the combustion zone. Hydrogen yield, methane conversion efficiency, and CO emission were used assess the MRCR performance.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

Sanusi

Mokheimer

2018

Int J Energy Res

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Summary Hydrogen is mostly produced in conventional steam methane reforming plants. In this work, we proposed a membrane‐based reformer‐combustor reactor (MRCR) for hydrogen generation in order to improve heat recovery and overall thermal efficiency. The proposed configuration will also reduce the complexity in existing steam methane reforming (SMR) plants. The proposed MRCR comprises combustion zone, hydrogen permeate zone, and SMR zone. A computational fluid dynamics model was developed using ANSYS‐Fluent software to simulate and analyze the performance of the proposed MRCR. Results show that high hydrogen yields were observed at high reformer pressures (RPs) and low gas hourly space velocities (GHSVs). Furthermore, by increasing the steam to methane ratio and addition of excess air in the combustion side, the hydrogen yield from the MRCR decreases. This is attributed to the reduction in the effective temperature of the hydrogen membrane. High RP, low GHSV, and low steam to methane ratio that increased the hydrogen yield also decreased carbon monoxide (CO) emissions. For an increased RP from 1 to 10 bar, the CO emission decreased by about 99%. The reduction in CO emission at high RP would be attributed to the effect of water gas shift reaction in the MRCR. Results of the extensive parametric study presented in this work can be used to determine the operating conditions based on tradeoffs between hydrogen yield (mole H2/mole CH4), hydrogen production rate (kg of H2/h), allowable CO emissions, and exhaust gas temperature for other applications such as gas turbine.

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CFD and experimental analysis of a 115kW natural gas fired lab-scale furnace under oxy-fuel and air–fuel conditions

Cited by 47 publications

References 40 publications

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

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

Study on nonpremixed methane/air combustion from flame structure and NO _X emission aspect for different burner head structures

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

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CFD and experimental analysis of a 115kW natural gas fired lab-scale furnace under oxy-fuel and air–fuel conditions

Cited by 47 publications

References 40 publications

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

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

Study on nonpremixed methane/air combustion from flame structure and NO X emission aspect for different burner head structures

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

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Product

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Study on nonpremixed methane/air combustion from flame structure and NO _X emission aspect for different burner head structures