The Modeling of a Flow in Flat and Radial Contact Units With a Still Granular Layer. Evaluations of a Cylindrical Reactor With a Radial Gas Input and a Free Output (Part 1)

Koleskin, V. N.; Yunusov, A. A.; Yunusovа, A.A.; Shtern, P. G.; Lukyanova, A. V.; Zhumadullayev, D.K.

doi:10.32014/2020.2518-1726.20

Cited by 1 publication

(10 citation statements)

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“…The solution of the eq. ( 9) [22] coincides with stationary (∂Ψ/∂t = 0) solutions of the eq. (1) at the same boundary conditions.…”

Section: Issn 2224-5286mentioning

confidence: 67%

“…To construct a difference scheme we use a relaxation method [20]. We put the elliptical equation ( 9) [22] into correspondence with the thermal conductivity equation:…”

Section: Issn 2224-5286mentioning

confidence: 99%

“…( 9) differs from the eq. (10) in p.1 [22] only by the last term which does not contain highest derivatives. Hence neither the equation type (elliptical) nor the solution method including a stability criterion of the difference scheme…”

Section: Issn 2224-5286mentioning

confidence: 99%

“…in [6]) do not differ the case of a plane reactor that is thoroughly considered in p.1 [22]. The solving of a direct problem, i.e.…”

Section: Issn 2224-5286mentioning

confidence: 99%

“…the determination of a velocity field and an evaluation of a pressure field in each reactor zone at specified velocity normal components on Γ 2 and Γ 3 boundaries, does not provide a fulfillment of boundary conditions for the pressure. To find the unique solution that is in accord with all boundary conditions it is necessary to solve an inverse problem such as to find normal components of the velocity on Γ 2 and Γ 3 boundaries that make a minimum of the functional (8) [22].…”

Section: Issn 2224-5286mentioning

confidence: 99%

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The Solving of the Problem in the Working Zone. The Numerical Calculation of the Model of the Nizhnekamsk Reactor for the Styrene Production (Part-3)

Koleskin

Yunusov²,

Yunusovа³

et al. 2021

Series Chemistry and Technology

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Heterogeneous catalytic processes conducted in axial or radial type reactors with a still catalytic layer are some of the most important elements of the chemical technology. The attention of scientists and manufacturers to the investigation and application of these contact units deals with the following advantages: a highly developed surface of a phase separation, a possibility to provide a high flow velocity and hence to decrease sizes and a material consumption, a construction simplicity and a reliability of an exploit. Improving an operation of contact units may be achieved by refining present technologies, catalysts, disperse system structures and by creating new ones. Nevertheless, in some cases large scale hydrodynamic heterogeneities in a working zone of the unit cancel out efforts to increase an efficiency of chemical, heat/mass transfer and other processes. The exploration of reasons of the hydrodynamic heterogeneities formation requires an investigation of liquid and gas motion physics features in granular layers. A practice of a chemical reactors exploitation reveals that technical and economical indicators of an industrial process are as a rule lower than the calculated ones, derived on a stage of the process design. Now it can be considered proven that one of the reasons affecting the reactor output is the heterogeneity of a reagents flow in a granular catalyst layer. The article deals with a mathematical modeling of an incompressible liquid flow in flat and radial contact units with the still granular layer and a creation of numerical realization methods for the model We propose a cycle of articles dealt with a model of a real reactor that consists of three parts: a distributing manifold, a collecting manifold and a working zone, where the still layer of a granular catalyst is loaded. An input and an output are made with a Z-shaped scheme. We consider processes and their equations in each reactor zone in detail.

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“…The solution of the eq. ( 9) [22] coincides with stationary (∂Ψ/∂t = 0) solutions of the eq. (1) at the same boundary conditions.…”

Section: Issn 2224-5286mentioning

confidence: 67%

“…To construct a difference scheme we use a relaxation method [20]. We put the elliptical equation ( 9) [22] into correspondence with the thermal conductivity equation:…”

Section: Issn 2224-5286mentioning

confidence: 99%

Section: Issn 2224-5286mentioning

confidence: 99%

“…in [6]) do not differ the case of a plane reactor that is thoroughly considered in p.1 [22]. The solving of a direct problem, i.e.…”

Section: Issn 2224-5286mentioning

confidence: 99%

Section: Issn 2224-5286mentioning

confidence: 99%

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