Theoretical Analysis of Granules Movement Hydrodynamics in the Vortex Granulators of Ammonium Nitrate and Carbamide Production

Аrtyukhov, Аrtem; Sklabinskyi, Vsevolod Ivanovych

doi:10.23939/chcht09.02.175

Cited by 37 publications

(13 citation statements)

References 2 publications

(3 reference statements)

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“…Data matching of theoretical calculations and experimental studies of hydrodynamics motion of the gas flow in the vortex granulator [13,14] vortex contact trays for gas cleaning in production of nature gas and NH 4 NO3 [15] and fluidized bed of granules in the vortex granulator [16] gives satisfactory results. A determination of the measurement error and the results of the basic hydrodynamic characteristics calculation of the interacting flows in the working area of the of the vortex granulator experimental sample are based on the conventional techniques and recommendations for the engineering experiment and the data processing.…”

Section: Resultsmentioning

confidence: 99%

Hydrodynamics of Gas Flow in Small-Sized Vortex Granulators in the Production of Nitrogen Fertilizers

Аrtyukhov

Sklabinskyi²

2015

ChChT

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Abstract. This paper presents the prospective line of studying such chemical process as granulation and the advantages of small universal vortex granulators usage in chemical processes, for example, for the production of nitrogen mineral fertilizers, complex mineral fertilizers and porous ammonium nitrate (PAN). The mathematical calculations for determining the hydrodynamic characteristics of gas flow movement, which ultimately affect the crystallization process in the workspace of the vortex granulator, are described. Components of a gas flow velocity and the granulator design impact on them are analytically determined. A comparison of theoretical and experimental studies is given.

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Section: Resultsmentioning

confidence: 99%

Hydrodynamics of Gas Flow in Small-Sized Vortex Granulators in the Production of Nitrogen Fertilizers

Аrtyukhov

Sklabinskyi²

2015

ChChT

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“…At the same time, due to the selection of optimal design of device the Bhydrodynamic^residence time of the granules in the device should be equal to the Bthermodynamic^drying time to the required moisture. The granules residence time in the working space of the shelf dryer and the vortex granulator-dryer was determined on the basis of a joint solution of the equations of hydrodynamics (the model is presented in [13,14]) and kinetics (the model is presented in [28,29]) of drying. The operating range of the devices was the velocity of the drying agent, which provided a interval between the first and second critical fluidization velocity.…”

Section: Methodsmentioning

confidence: 99%

“…Another way to create a directional movement of dispersed material is the application of vortex fluidized bed in granulators-dryers [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Utilization of dust and ammonia from exhaust gases: new solutions for dryers with different types of fluidized bed

Аrtyukhov

Аrtyukhova

2018

J Environ Health Sci Engineer

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Background The article is devoted to the development of new utilization methods of exhaust gases by cleaning them from fine particles, dust and harmful gas components. The basic design solutions, which allow to increase the degree of exhaust gases cleaning, were presented. The effectiveness of design solutions was supported by the results of experimental studies. Analysis of the research results allowed developing of new designs of equipment for dehydration in fluidized bed. The article also presents the calculation algorithm of eco-friendly dryers with fluidized bed. Methods Physical modeling was based on methods of similarity theory. In studies in dryers experimental models the installation scale was changed (compared with industrial conditions). Geometric similarity was maintained by equity of constants and invariants of geometric similarity. Always similarity of respective particles movement and their trajectories in industrial design and in experimental models was also maintained. The creation of graphical dependences was carried out by differential methods of mathematical analysis and integral calculus. The reliability of obtained experiment results was caused by the application of time-tested in practice methods. Results and discussion Control of product fractional composition allowed to make a selection of required fractions (including the fine granules) in a certain place of device. This allowed to increase the degree of purification of exhaust gas even before it output from the dryer working space. The process of separating the granules into fractions and the selection of fine fraction can be performed due to structural changes in dryer units and selection of optimal hydrodynamic conditions of fluidizing agent motion. Installation of special units in the dryers allowed to extract other contaminants from the exhaust gases. Conclusions Proposed constructive solutions for fluidized bed dryers allowed to:-provided of granules classification to the desired number of fractions with a simultaneous release and discharged of fine fraction from the working volume of dryer without the exhaust gases; -increased the degree of monodispersity of commodity granules on 25-35%; -reduced the amount of dust in the exhaust gases on 35-65%; -reduced the ammonia content in the exhaust gas on 90-95%.

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“…This fully applies to the production of the commodity form of nitrogen fertilizers, which is carried out in two main ways [2]: -granulation starting from the liquid phase by dispersing it on the surface of suspended particles in a fluidized bed that can be variously configured (technologies of Casale S.A., Switzerland; Kahl Group, Germany; Stamicarbon, Netherlands; Toyo Engineering Corporation, Japan; Thyssenkrupp Fertilizer Technology GmbH, Germany, etc.) [3][4][5][6][7][8], including vortex granulation [9,10]; -granulation starting from the liquid phase by dispersing into drops followed by crystallization of the solute by dewatering and cooling (prilling) (devices of Norsk Hydro, Norway; Didier Engineering GmbH, Germany; Imperial Chemical Industries, UK; Kaltenbach-Thuring S. A., France, etc.) [11].…”

Section: Introductionmentioning

confidence: 99%

Decay of the melt stream during dispersion in granulation devices

Sklabinskyi

Artyukhov

Kononenko

et al. 2019

Hem Ind

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The aim of the article is a theoretical description and experimental study of the melt jet expiration process from a perforated shell of a vibrating granulator. Mathematical modeling of hydrodynamic flows was carried out based on the points of classical fluid and gas mechanics and technical hydromechanics. Reliability of the obtained experimental results is based on the application of time-tested in practice methods. Hydrodynamic properties of the liquid jet outflow were obtained. The presented mathematical model allows calculation of the radial component of the jet outflow velocity, as well as determination of the influences of physical and chemical properties of the liquid and the outflow hole diameter on the jet length and flow velocity along the axis to its disintegration into separated drops. The developed mathematical model extended with the theoretical description of the melt dispersion process from rotating perforated shells allowed us to improve design of the granulator to stabilize hydrodynamic parameters of the melt movement. The nitrogen fertilizers melt disperser was investigated regarding industrial-scale production and operating parameters of the process of jet decay into drops, drop size and monodispersity level were optimized.

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Theoretical Analysis of Granules Movement Hydrodynamics in the Vortex Granulators of Ammonium Nitrate and Carbamide Production

Cited by 37 publications

References 2 publications

Hydrodynamics of Gas Flow in Small-Sized Vortex Granulators in the Production of Nitrogen Fertilizers

Hydrodynamics of Gas Flow in Small-Sized Vortex Granulators in the Production of Nitrogen Fertilizers

Utilization of dust and ammonia from exhaust gases: new solutions for dryers with different types of fluidized bed

Decay of the melt stream during dispersion in granulation devices

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