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1
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CFD analysis of mixing intensity in jet stirred reactors

100%
Gil I., Mocek P.
Chemical and Process Engineering
|
2012
|
vol. 33
|
issue 3
397-410
EN
The homogeneous stirred reactor designed for kinetic studies of the combustion of hydrocarbons with intensive internal recirculation in high temperature combustion chamber is described. The originality of our reactor lies in its construction which allows to intensively mix fuel and flue gases, measure gas temperature as well as obtain samples which can be used to investigate diffusion flames. The cylindrical construction enables to use the reactor in laboratory cylindrical electrically heated ovens. The CFD analysis of the reactors, the mixing parameters (turbulent Peclet number and mixing level) and the volume average temperature in the reactors were elaborated on the basis of the typical dimensions of classical reactors to kinetics research as well as the own reactor design. The results of the analysis allow to reveal advantages of our construction.
2
Content available remote

Study of the Process of Hydraulic Mixing in Anaerobic Digester of Biogas Plant

100%
Karaeva J. V., Khalitova G. R., Kovalev D. A., Trakhunova I. A.
Chemical and Process Engineering
|
2015
|
vol. 36
|
issue 1
101-112
EN
Two systems of hydraulic mixing in a vertical cylindrical anaerobic digester: standard and modernised are discussed in the paper. Numerical investigations that were carried out are focused on a study of hydrodynamic processes in an aerobic digester using two various systems of hydraulic mixing as well as on analysis of the efficiency of methane fermentation process accomplished under different geometric parameters of an anaerobic digester and systems of hydraulic mixing.
3
Content available remote

Numerical Calculations of WR-40 Boiler Based on its Zero-Dimensional Model

100%
Hernik B.
Chemical and Process Engineering
|
2014
|
vol. 35
|
issue 2
173-180
EN
Generally, the temperature of flue gases at the furnace outlet is not measured. Therefore, a special computation procedure is needed to determine it. This paper presents a method for coordination of the numerical model of a pulverised fuel boiler furnace chamber with the measuring data in a situation when CFD calculations are made in regard to the furnace only. This paper recommends the use of the classical 0-dimensional balance model of a boiler, based on the use of measuring data. The average temperature of flue gases at the furnace outlet tk" obtained using the model may be considered as highly reliable. The numerical model has to show the same value of tk" . This paper presents calculations for WR-40 boiler. The CFD model was matched to the 0-dimensional tk" value by means of a selection of the furnace wall emissivity. As a result of CFD modelling, the flue gas temperature and the concentration of CO, CO2, O2 and NOx were obtained at the furnace chamber outlet. The results of numerical modelling of boiler combustion based on volumetric reactions and using the Finite-Rate/Eddy-Dissipation Model are presented.
4
Content available remote

Hydraulic Mixing Modelling in Reactor for Biogas Production

100%
Chmielewski A. G., Berbeć A., Zalewski M., Dobrowolski A.
Chemical and Process Engineering
|
2012
|
vol. 33
|
issue 4
621-628
EN
Two-stage biogas production plant consists of two reactors: a hydrolyser and a fermentor. The bioreactor construction has to meet three requirements: low cost and simplicity of construction and good biomass mixing conditions with an application of appropriate method. This paper reports CFD modelling of hydraulic mixing in the tank to be applied in a two-stage industrial installation.
5
Publication available in full text mode
Content available

Study of the Process of Hydraulic Mixing in Anaerobic Digester of Biogas Plant

88%
Karaeva J. V., Khalitova G. R., Kovalev D. A., Trakhunova I. A.
Chemical and Process Engineering
|
2015
|
issue 1
6
Publication available in full text mode
Content available

Numerical Calculations of WR-40 Boiler Based on its Zero-Dimensional Model

88%
Hernik B.
Chemical and Process Engineering
|
2014
|
issue 2
7
Publication available in full text mode
Content available

CFD analysis of mixing intensity in jet stirred reactors

88%
Gil I., Mocek P.
Chemical and Process Engineering
|
2012
|
issue 3
8
Publication available in full text mode
Content available

Hydraulic Mixing Modelling in Reactor for Biogas Production

88%
Berbeć A., Chmielewski A. G., Zalewski M., Dobrowolski A.
Chemical and Process Engineering
|
2012
|
issue 4
9
Content available remote

Modelling and Measurement of Bubble Formation and Growth in Electroflotation Processes

88%
Sarkar S. K. A., Machniewski P. M., Evans G. M.
|
|
vol. 34
|
issue 3
327-336
EN
Electroflotation is used in the water treatment industry for the recovery of suspended particles. In this study the bubble formation and release of hydrogen bubbles generated electrolytically from a platinum cathode was investigated. Previously, it was found that both the growth rate and detachment diameter increased with increasing wire diameter. Conversely, current density had little effect on the released bubble size. It was also found that the detached bubbles rapidly increased in volume as they rose through the liquid as a result of decreasing hydrostatic pressure and high levels of dissolved hydrogen gas in the surrounding liquid. The experimental system was computationally modelled using a Lagrangian-Eulerian Discrete Particle approach. It was revealed that desorption of gaseous solutes from the electrolyte solution, other than hydrogen, may have a significant impact on the diameter variation of the formed bubbles. The simulation confirmed that liquid circulation, either forced or induced by the rising bubble plume, influences both the hydrogen supersaturation (concentration) in the neighbourhood of the electrode and the size of the resulting bubbles.
10
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Numerical modelling of a stoker furnace operated under indirect co-firing of biomass

75%
Litka R., Kalisz S.
Chemical and Process Engineering
|
2016
|
vol. 37
|
issue 2
11
Publication available in full text mode
Content available

Modelling and Measurement of Bubble Formation and Growth in Electroflotation Processes

75%
Sarkar S. K. A., Machniewski P. M., Evans G. M.
Chemical and Process Engineering
|
2013
|
issue 3
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