Three-dimensional calculation of a chemically reacting porous particle moving in a hot O 2 /CO 2 atmosphere

Richter, Andreas; Nikrityuk, Petr A.; Meyer, Bernd

doi:10.1016/j.ijheatmasstransfer.2014.11.090

Cited by 61 publications

(43 citation statements)

References 37 publications

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“…Complete pore‐resolved simulations of all transport and reaction processes have so far only been performed for individual particles , . The reaction was implemented either under simplified macro kinetic approaches or under transient conditions .…”

Section: Classification Of Model Approachesmentioning

confidence: 99%

“…However, a coupled solution of all balances is not possible or only with very long computation time of up to months (e.g., , ). Furthermore, the complete solution of all balances is only possible for single particles , . The calculation of entire reactor geometries or transient processes has not been possible until today.…”

Section: Classification Of Model Approachesmentioning

confidence: 99%

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Modeling and Validating Fixed‐Bed Reactors: A State‐of‐the‐Art Review

2019

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Modeling of heat and mass transfer in fixed‐bed reactors for heterogeneously catalyzed gas phase reactions is possible using different methods. Homogeneous and heterogeneous continuum models as well as particle resolved modeling of fixed‐bed reactors show high potential for application. Considering those approaches, advantages and disadvantages as well as underlying assumptions and boundary conditions are discussed. Additionally, methods for experimental validation are presented and discussed focusing on the two‐dimensional homogeneous models.

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Section: Classification Of Model Approachesmentioning

confidence: 99%

Section: Classification Of Model Approachesmentioning

confidence: 99%

Modeling and Validating Fixed‐Bed Reactors: A State‐of‐the‐Art Review

2019

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“…, ) und iterativen Vorgehen verbunden. Zudem ist die vollständige Lösung aller Bilanzen nur für einzelne Partikel möglich , . Die Berechnung vollständiger Reaktorgeometrien bzw.…”

Section: Klassifizierung Der Modellansätzeunclassified

Modeling and Validating Fixed‐Bed Reactors: A State‐of‐the‐Art Review

Stegehake

Riese

Grünewald

2018

Chemie Ingenieur Technik

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Es stehen vielfältige Methoden zur Beschreibung der Wärme‐ und Stofftransportvorgänge in Festbettreaktoren für die Durchführung von heterogen katalysierten Gasphasenreaktionen zur Verfügung. Neben den homogenen und heterogenen Kontinuumsmodellen kann auch der partikelaufgelösten Modellierung ein hohes Anwendungspotenzial zugewiesen werden. Für die Methoden werden die Vor‐ und Nachteile sowie Annahmen und Randbedingungen dargestellt und diskutiert. Zusätzlich werden die Möglichkeiten zur experimentellen Validierung diskutiert, wobei der Fokus dabei auf den besonders verbreiteten zweidimensionalen, homogenen Kontinuumsmodellen liegt.

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“…It should also be noted that the reaction C + 2H 2 is not included in the considerations because the rate of reaction is much lower than for other heterogeneous reactions. For further discussion on this issue we refer to Schulze et al and Richter …”

Section: Model Descriptionmentioning

confidence: 99%

“…Note here that in terms of ideal gas the word ‘incompressible’ does not mean constant density; see Equation . Porosity of the particles is not taken into account, thus the intraparticle diffusion is neglected. The particles consist of carbon only. In particular, the volatilization of the particles is neglected due to the steady‐state character of the model. The radiation of the gas phase is modelled using the P‐1 model due to its robustness and good performance when applied to char oxidation modelling The buoyancy effect is neglected. Transport properties of solid carbon are constant; their temperature dependence is negligible. Finally, the complete system of equations including the solved P1 radiation model takes the following form:

\nabla \cdot false(ρ \vec{u} false) = 0

\nabla \cdot false(ρ \vec{u} \otimes \vec{u} false) = - \nabla p + \nabla \cdot false(\overset{\overset{τ}{true}}{true} false)

where

ρ

is the density, p is the pressure, and

\overset{u}{true}

is the velocity vector.…”

Section: Model Descriptionmentioning

confidence: 99%

2‐D approximation of a structured packed bed column

2016

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The landfill leachate can be a major problem due to large variability of high organic, inorganic, heavy metal content and toxicity characteristics from landfill leachate such as cadmium. Thus, this study was aimed to observe the application of rice husk packed bed column to reduce cadmium from landfill leachate. Experiment was conducted in gravity down flow system by pumping landfill leachate into packed bed column. The effect of influent flow rate to adsorption capacity was studied by varying flow rate (5 mL/min and 10 mL/min). The effluent-influent concentration ratio C /C (%) as a function of throughput volume (L) was used to represent the e 0 breakthrough curve in column systems. Result shows that the flow rate of 5 mL/min was favorable to achieve higher removal rates with the percentage of cadmium was 57 %. At breakthrough time, the cadmium effluent concentration reached on 0.01 mg/l for both of flow rate. Kata Kunci : Landfill leachate, packed bed column, adsorption, rice husk, cadmium. ABSTRAK Lindi yang dihasilkan dari TPA (Tempat Pembuangan Akhir) menimbulkan permasalahan lingkungan karena kandungan pencemarnya meliputi material organik, material anorganik, logam dan material beracun. Salah satu logam berat yang terdapat dalam lindi tersebut adalah kadmium. Penelitian ini bertujuan untuk mereduksi kadmium dalam lindi dengan menggunakan sekam padi yang diinstal dalam packed bed column. Lindi dipompakan dari tangki penampung lindi ke dalam packed bed column dan dialirkan dari atas ke bawah kolom secara gravitasi. Fokus pada penelitian ini adalah pengaruh laju alir influen terhadap kapasitas adsorpsi. Dimana lindi dialirkan dengan laju alir 5 mL/menit dan 10 mL/menit. Kurva breakthrough (titik jenuh) kolom dipresentasikan oleh hubungan antara rasio konsentrasi efluen-influen C /C (%) dan e 0 jumlah aliran lindi yang diolah dalam kolom. Hasil eksperimen menunjukkan bahwa persentase reduksi tertinggi dicapai pada laju alir 5 mL/menit yaitu 57%. Waktu jenuh kedua laju alir (5 mL/menit dan 10 mL/menit) tercapai saat konsentrasi efluen kadmium 0.01 mg/L.

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Three-dimensional calculation of a chemically reacting porous particle moving in a hot O 2 /CO 2 atmosphere

Cited by 61 publications

References 37 publications

Modeling and Validating Fixed‐Bed Reactors: A State‐of‐the‐Art Review

Modeling and Validating Fixed‐Bed Reactors: A State‐of‐the‐Art Review

Modeling and Validating Fixed‐Bed Reactors: A State‐of‐the‐Art Review

2‐D approximation of a structured packed bed column

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