Verifying the Prediction Result Reliability Using k-ε, Eddy Dissipation, and Discrete Transfer Models Applied on Methane Combustion Using a Prototype Low-Pressure Burner

Honus, Stanislav; Pospíšilík, Václav; Jursová, Simona; Šmída, Zdeněk; Molnár, Vieroslav; Dovica, Miroslav

doi:10.12913/22998624/80922

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…All simulations performed in this paper are described with Reynolds-Averaged Navier-Stokes equations. The Reynolds stress tensor was modelled by using the turbulence model, which details can be found in [26].…”

Section: Mathematical Modelmentioning

confidence: 99%

Assessment of radiative heat transfer impact on a temperature distribution inside a real industrial swirled furnace

et al. 2020

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Combustion systems will continue to share a portion in energy sectors along the current energy transition, and therefore the attention is still given to the further improvements of their energy efficiency. Modern research and development processes of combustion systems are improbable without the usage of predictive numerical tools such as Computational Fluid Dynamics (CFD). The radiative heat transfer in participating media is modelled in this work with Discrete Transfer Radiative Method (DTRM) and Discrete Ordinates Method (DOM) by finite volume discretisation, in order to predict heat transfer inside combustion chamber accurately. DTRM trace the rays in different directions from each face of the generated mesh. At the same time, DOM is described with the angle discretisation, where for each spatial angle the radiative transport equation needs to be solved. In combination with the steady combustion model in AVL FIRE? CFD code, both models are applied for computation of temperature distribution in a real oil-fired industrial furnace for which the experimental results are available. For calculation of the absorption coefficient in both models weighted sum of grey gasses model is used. The focus of this work is to estimate radiative heat transfer with DTRM and DOM models and to validate obtained results against experimental data and calculations without radiative heat transfer, where approximately 25 % higher temperatures are achieved. The validation results showed good agreement with the experimental data with a better prediction of the DOM model in the temperature trend near the furnace outlet. Both radiation modelling approaches show capability for the computation of radiative heat transfer in participating media on a complex validation case of the combustion process in oil-fired furnace.

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Section: Mathematical Modelmentioning

confidence: 99%

Assessment of radiative heat transfer impact on a temperature distribution inside a real industrial swirled furnace

et al. 2020

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“…In tubular horizontal burners, the situation is much better as the sinters no longer have to overcome the gravitational but only frictional force on the tube wall and are mostly blown out of the burning process without problems. NO disadvantage of this system is that even unburned pieces of pellets can easily fall out of the burning process [10,11]. Some compromise is to tilt the burner upwards, at an angle at which the pellets would remain in the tube and burn smoothly.…”

Section: Influence Of Flame Directionmentioning

confidence: 99%

“…Particulate matter measurement was conducted by gravimetric method by using of the isokinetic automatic sampler TECORA Isostack Basic. Gravimetric method is given by the standard ISO 9096 [9,10]. It is a manual, single-use method where samples are taken by a probe from flowing gas.…”

Section: Figure 3 Experimental Device For Heat Source Testingmentioning

confidence: 99%

Operation of the Automatic Heat Source on Pellets With Various Burner Types

Holubčík¹,

Kantová²,

Trnka³

et al. 2019

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One of the most important issues in choosing a heating system is the question: What kind of fuel can be burned in given heating system. Modern automatic solid fuel boilers are often specialized only on a narrow range of suitable pellet materials. Pellets from cheaper sources are also beginning to appear on the market. However, many burners are unable to burn these new types of pellets without significant burning problems. The article deals with the influence of the proper construction of the burner on the smoothness of the combustion process and the smooth operation of the combustion equipment. The results of the experiments document the continuity of the combustion plant in the combustion of less quality pellets containing bark using more modern combustion technologies. In fact, less quality pellets cause the formation of ash sinters which cause the continuous combustion process to be interrupted, resulting in fluctuations in equipment performance and the onset of thermal discomfort. The results showed no problem with burning even when making sinters, but also showed a fluctuation in performance and the need for manual control, especially when heating or clogging the supply pipe. They also showed significant damage to pellets in the worm feeder section. These problems, therefore, ultimately require further research to ensure complete, seamless operation.

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“…This leads to incorrect combustion processes, reducing combustion efficiency, increasing emissions production and increasing the risk of damage to heat sources. Therefore, it is important to optimize the heat source or use an appropriate burner, and also allow co-combustion with other wood materials [5,6].…”

Section: Introductionmentioning

confidence: 99%

Analyses of Pellets Produced from Spruce Sawdust, Spruce Bark, and Pine Cones in Different Proportions

et al. 2022

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A lot of residual biomass has energy value and can be used for further applications through suitable treatments, such as pelletization. This treatment can improve properties, mainly energy density, but can also lead to problems due to their low ash melting temperatures, high ash content, and the formation of harmful compounds during combustion. This article deals with the energy potential of pellets produced from spruce sawdust, spruce bark, and pine cones in different proportions. The impact of cone and bark contents on pellet properties was also observed. The energy properties of the produced pellets were measured, such as the contents of carbon, hydrogen, nitrogen, moisture, volatile, fixed carbon, and ash, as well as calorific values and ash melting temperatures. Based on the results, it can be concluded that the addition of pine cones and spruce bark to spruce sawdust mainly affected the contents of nitrogen and ash and melting temperatures. Despite this, all produced pellets met the standard EN ISO 17225-2 for the content of nitrogen, ash, and also lower calorific value at least B quality. However, only three pellet samples of five met this standard for A2 and B quality for ash melting behavior. Therefore, they present an alternative fuel with interesting energy potential.

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Verifying the Prediction Result Reliability Using k-ε, Eddy Dissipation, and Discrete Transfer Models Applied on Methane Combustion Using a Prototype Low-Pressure Burner

Cited by 5 publications

References 14 publications

Assessment of radiative heat transfer impact on a temperature distribution inside a real industrial swirled furnace

Assessment of radiative heat transfer impact on a temperature distribution inside a real industrial swirled furnace

Operation of the Automatic Heat Source on Pellets With Various Burner Types

Analyses of Pellets Produced from Spruce Sawdust, Spruce Bark, and Pine Cones in Different Proportions

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