Cold Flow Model Study of an Oxyfuel Combustion Pilot Plant

Guío‐Pérez, Diana Carolina; Tondl, Gregor; Höltl, W.; Pröll, Tobias; Hofbauer, Hermann

doi:10.1002/ceat.201100160

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…U j is the jet initial velocity, and Φ j is the passive scalar concentration at the jet inlet, which was defined as 1 in the mass fraction form in this work. e decay rates of the mean streamwise velocity 1/B and the scalar concentration 1/B Φ are calculated by the curve fitting the time-averaged data from simulation results based on Equations (12) and (13). For validation, data from 30 to 50 D j were used for calculation in order to be consistent with Larsson et al [8].…”

Section: Resultsmentioning

confidence: 99%

“…e early measurement by Glass and Bilger [12] indicated that a turbulent jet flame (or as they called "a heated jet-wake") and an isothermal turbulent round jet (isothermal jet-wake) have very similar turbulence quantities, such as the turbulence intensities and shear stress. Cold models provide an easy way to investigate the influence of different variables and facilitate measurements for validation [13]. is and the fact that the results can be compared to experiments, and previous simulations validate further studies on the simplified case in [2][3][4][5][6] now with focus on the jet development as a function of position and Reynolds number (Re).…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Reynolds Number on Jet in Asymmetric Co-Flows: A CFD Study

Teng

Larsson

Lundström

et al. 2018

International Journal of Chemical Engineering

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In rotary kilns in grate-kiln systems for iron ore pelletizing, a long and stable jet flame is needed to ensure a high quality of the pellets. The primary jet issuing from the nozzle interacts with two asymmetric co-flows creating a very complex flow. In order to better understand and eventually model this flow with quality and trust, simplified cases need to be studied. In this work, a simplified and virtual model is built based on a down-scaled kiln model established in a previous experimental work. The aim is to numerically study the jet development as a function of position and Reynolds number (Re). The numerical simulations are carried out with the standardk-εmodel, and quite accurate velocity profiles are obtained while the centerline decays and spreading of the passive scalars are over predicted. The model is capable of predicting a Re dependency of the jet development. With increasing Re, the jet is longer while it generally decays and spreads faster resulting from the stronger shear between the jet and co-flows and the stronger entrainment from the recirculation zone. This recirculation found in the simulations restrain the momentum spreading in the spanwise direction, leading to a slower velocity spreading with higher Re. For further validation and understanding, more measurements in the shear layer and simulations with more advanced turbulence models are necessary.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of Reynolds Number on Jet in Asymmetric Co-Flows: A CFD Study

Teng

Larsson

Lundström

et al. 2018

International Journal of Chemical Engineering

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“…The tanks‐in‐series (TIS) model with the gamma extension model was used to model the RTD of the solids. The TIS model was used successfully in previous RTD studies of fluidized beds . It assumes that the system of interest consists of N statistically independent tanks of equal volume in series and that the solids in each tank are perfectly mixed.…”

Section: Description Of the Experimentsmentioning

confidence: 99%

Use of a Chemical‐Looping Reaction to Determine the Residence Time Distribution of Solids in a Circulating Fluidized Bed

Donat

Dennis

2016

Energy Tech

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The residence time distribution (RTD) of solids in various sections of a circulating fluidized bed (CFB) is of great importance for design and operation but is often difficult to determine experimentally. A noninvasive method is described, for which the RTD was derived from temporal measurements of the temperature following the initiation of a chemical‐looping reaction. To demonstrate the method, a CuO‐based oxygen carrier was used in a small‐scale CFB, and measurements were made in the fuel reactor, operated as a bubbling fluidized bed. The measurements were fitted to the tanks‐in‐series model, modified to account for heat losses from the reactor. There was excellent agreement between the model and the experiment. Limitations and further improvements of the method are discussed, also with respect to larger reactors.

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“…Several studies were carried out to optimize the operating parameters or investigate the flow behavior in industrial reactors 1, 3–10. Model simulation studies were also performed to identify the deviation from ideal reactors for these industrial RTD experiments.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Two Identical Industrial Digesters Using Radiotracer‐Based Residence Time Distribution Measurement

et al. 2022

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Radiotracer-based residence time distribution (RTD) measurements were performed for two identical wheat straw pulping digesters to evaluate and compare their performances. The radiotracer technetium ( 99m Tc) as sodium pertechnetate was used to follow the liquid phase inside the digester. The product quality of both digesters was not identical for similar sets of operating conditions. Temperature, pressure, and mass flow rates were the influencing parameters, and the experimental and theoretical mean residence time (MRT) were compared. A significant amount of flow abnormalities was observed in the second digester as compared to the first one, including channeling, dead volume, scaling, and bypassing. The axial dispersion model and tank in series with the back-mixing model were suitable for modeling the obtained RTD data.

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Cold Flow Model Study of an Oxyfuel Combustion Pilot Plant

Cited by 10 publications

References 11 publications

The Effect of Reynolds Number on Jet in Asymmetric Co-Flows: A CFD Study

The Effect of Reynolds Number on Jet in Asymmetric Co-Flows: A CFD Study

Use of a Chemical‐Looping Reaction to Determine the Residence Time Distribution of Solids in a Circulating Fluidized Bed

Comparative Study of Two Identical Industrial Digesters Using Radiotracer‐Based Residence Time Distribution Measurement

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