Numerical Investigation of Pressure Drop in Single Pellet String Reactors

Fernengel, Johanna; Bolton, Leslie W.; Hinrichsen, Olaf

doi:10.1002/ceat.201900372

Cited by 7 publications

(5 citation statements)

References 17 publications

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“…The momentum loss source term is added to the original momentum equation for gas seepage in the gob through porous media, and its momentum loss is divided into viscous loss and inertial loss. Blake‐Kozeny formula 34 is used to describe the permeability, viscous resistance coefficient, and inertial resistance coefficient of the gob.

{C}_{1}=\frac{1}{e},

{C}_{2}=\frac{{D}_{P}\times {n}^{3}}{3.5\times {(1-n)}^{2}},

where C 1 is the viscous resistance coefficient; C 2 is the inertial resistance coefficient; D P is the average particle diameter; e is the permeability; n is the porosity;…”

Section: Methodsmentioning

confidence: 99%

“…The momentum loss source term is added to the original momentum equation for gas seepage in the gob through porous media, and its momentum loss is divided into viscous loss and inertial loss. Blake-Kozeny formula 34 is used to describe the permeability, viscous resistance coefficient, and inertial resistance coefficient of the gob.…”

Section: (6) Inertial Resistance Viscous Resistancementioning

confidence: 99%

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Investigation on risk fields assessment in the longwall working face with single side roof cutting along the gob

Min,

Liu,

Chen

et al. 2023

Energy Science & Engineering

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The number of mines using roof cutting and pressure relief technology to extract mine deep coal resources is increasing daily. Most of these mines are facing the risk of high gas emission and residual coal spontaneous combustion disasters, and the composite disasters caused by these two risks also threaten the safety of mine production. On the basis of constructing a model for the evolution of porosity and permeability in a single side roof cutting along the gob, this study studied the occurrence locations of gas explosion risk areas, oxidation and heating risk areas, and composite disaster areas under different air supply and gas emission conditions, and summarized the evolution laws of composite disaster risk areas. The research results show that the roof rock collapse caused by roof cutting and pressure relief technology reduces the permeability of porous medium, which significantly reduces the sensitivity of the width of the oxidation temperature rise zone and the composite disaster area to the air supply. The increase in air supply causes the position of the composite disaster risk zone inside the goaf to shift toward the deep part of the goaf, while the width remains basically unchanged. The increase in gas emissions has suppressed the occurrence of coal spontaneous combustion in the goaf, while also keeping the gas concentration in a large area outside the upper limit of gas explosion. The research content enriches the research system of gas and oxygen flow fields in the goaf cutting face, and has positive significance for the promotion and application of goaf cutting technology and the understanding of secondary disasters caused by it.

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{C}_{1}=\frac{1}{e},

{C}_{2}=\frac{{D}_{P}\times {n}^{3}}{3.5\times {(1-n)}^{2}},

where C 1 is the viscous resistance coefficient; C 2 is the inertial resistance coefficient; D P is the average particle diameter; e is the permeability; n is the porosity;…”

Section: Methodsmentioning

confidence: 99%

“…The momentum loss source term is added to the original momentum equation for gas seepage in the gob through porous media, and its momentum loss is divided into viscous loss and inertial loss. Blake-Kozeny formula 34 is used to describe the permeability, viscous resistance coefficient, and inertial resistance coefficient of the gob.…”

Section: (6) Inertial Resistance Viscous Resistancementioning

confidence: 99%

Investigation on risk fields assessment in the longwall working face with single side roof cutting along the gob

Min,

Liu,

Chen

et al. 2023

Energy Science & Engineering

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“…In two recent publications, Fernengel et al [ 31,32 ] developed and proposed a SPSR design criterion that could be used to assess existing set‐ups or to design new ones, and a modified equivalent diameter used with the Blake‐Kozeny equation to accurately estimate the pressure drop.…”

Section: Descriptionmentioning

confidence: 99%

Experimental methods in chemical engineering: High throughput catalyst testing — HTCT

et al. 2021

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The conventional one‐at‐a‐time strategy to evaluate catalysts is inefficient and resource intensive. Even a fractional factorial design takes weeks to control for temperature, pressure, composition, and stability. Furthermore, quantifying day‐to‐day variability and data quality exacerbates the time sink. High‐throughput catalyst testing (HTCT) with as many as 64 parallel reactors reduces experimental time by two orders of magnitude and decreases the variance, as it is capable of quantifying random errors. This approach to heterogeneous catalyst development requires dosing each reactor precisely with the same flow and composition, controlling the temperature and identifying the isothermal zone, on‐line analysis of the gas‐phase, and a common back pressure regulator to maintain constant pressure. Silica capillary or microfluidic distribution chip manifolds split a common feed stream precisely (standard deviation <0.5%), thus guaranteeing reproducibility. With these systems, experimenters shift their focus from operating a single reactor to careful catalyst synthesis, sometimes delicate catalytic reactor loadings, and the handling, processing, and analysis of massive amounts of data. This review presents an overview of the main elements of HTCT, its applications, potential sources of uncertainty, and a set of best practises derived from scientific literature and research experience. A bibliometric analysis of articles Web of Science indexed from 2015–2020 grouped research into five clusters: (1) discovery, directed evolution, enzymes, and complexes; (2) electrocatalysis, reduction, adsorption, and nanoparticles; (3) hydrogen, oxidation, and stability; (4) DFT, combinatorial chemistry, and NH3; and (5) graphene and carbon.

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“…So many applications use packed tubes of low tube-to-particle diameter ratio (N) of less than 10, for which the description of radial heat transfer is a challenging problem. 1 Some applications have very low N < 4, such as single-pellet string beds 2 or small beds used for catalyst testing. 3 A major problem for very low-N fixed beds is mathematical modeling.…”

Section: Introductionmentioning

confidence: 99%

Local Structure Effects on Heat Transfer in Very Low Tube-to-Particle Diameter Ratio Fixed Beds of Spheres

Dixon

2021

Ind. Eng. Chem. Res.

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New fixed-bed radial heat transfer experimental data are reported for beds of perfect spheres for tube-to-particle diameter ratio (N) in the range of 1.38–6.29. These results are combined with a re-analyzed smaller data set for spheres in the range 1.13 ≤ N ≤ 6.4 from an earlier publication. Very strong local bed structure effects were found for the estimates of effective radial thermal conductivity and apparent wall heat transfer coefficient, giving maximum and minimum values at particular N, which departed from the overall trend. The extreme values often corresponded with fluctuations of the void fraction ε, but they could not be explained by the bulk void fraction alone. Local bed structures resulted in changes in the flow pattern. Standard correlations can predict only average changes and trends, due to their neglect of local structure, and may be considerably in error for any particular N.

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Numerical Investigation of Pressure Drop in Single Pellet String Reactors

Cited by 7 publications

References 17 publications

Investigation on risk fields assessment in the longwall working face with single side roof cutting along the gob

Investigation on risk fields assessment in the longwall working face with single side roof cutting along the gob

Experimental methods in chemical engineering: High throughput catalyst testing — HTCT

Local Structure Effects on Heat Transfer in Very Low Tube-to-Particle Diameter Ratio Fixed Beds of Spheres

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