Modeling of the process of the cement separation in the closed aerodynamic unit

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Abstract

The process of energy capacity reduction and increasing of the productivity of the cement manufacturing technologies is closely related to the creation of the modern closed aerodynamic units (CAU) with recirculation, which allows achieving the effective separation of the high-dispersity materials. The purpose of this study is to simulate the cement separation process in a CAU consisting of separator, thickening agent and centrifugal collector. To achieve this goal, a methodology for calculating the probability interval of the final product granules in the main participants at all stages of the CAU operation is provided. The main conditions of the operating mode are established and the approach to solve the issues of the material separation under the conditions of the flow unit mode is proposed. Special attention is paid to the mathematical methods used to estimate the fractional emission of the small granules and calculation of the recirculated material. The studies include both analytical calculations and visualization obtained by means of charts of the granulometric composition of the final product for the various components of the unit. The obtained results represent the basis for the modeling and optimization of the cement separation process in the CAU, which ensures the reliable forecasting of the analytical materials and the further possibility of using of the new technologies.

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About the authors

V. S. Prokopenko

Belgorod State Technological University named after V.G. Shukhov

Author for correspondence.
Email: vlad.prokopenko1@yandex.ru

Engineer, Senior Lecturer 

Russian Federation, 46, Kostyukova Street, Belgorod, 308012

V. V. Strokova

Belgorod State Technological University named after V.G. Shukhov

Email: vvstrokova@gmail.com

Doctor of Sciences (Engineering) 

Russian Federation, 46, Kostyukova Street, Belgorod, 308012

T. N. Orekhova

Belgorod State Technological University named after V.G. Shukhov

Email: nefact@mail.ru

Candidate of Sciences (Engineering) 

Russian Federation, 46, Kostyukova Street, Belgorod, 308012

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2. Fig. 1. Diagrammatic flow sheet of the closed aerodynamic unit: 1 – separator; 2 – thickening agent; 3 – Centrifugal collector; 4 – air-blower; 5 – recirculation gas duct. Structure of the product flows of the different granulometric composition: R11 – stock; R21 – product extracted in the separator with diameter d> 80 μm; R31=R12 – product extracted in separator, d<80 μm; R22 – product extracted in the thickening agent, d>40 μm; R32=R13 – product extracted in the thickening agent, d<40 μm; R33 – final product, d<40 μm; R23 – air mixture with material that has not settled in the centrifugal collector concentrator, d<40 μm; R33 – finished product, d<40 μm; R23 – air mixture with material that has not settled in the cyclone

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3. Fig. 2. Fractional content of the different sizes depending on the type of product and the type of the equipment during the operation of the CAU: 1 – separator tailings R21(d); 2 – crude product from the concentrator R22(d); 3 – material from the centrifugal collector to the gas duct R23(d)

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4. Fig. 3. Fractional emission of the thin product, taking into account the fraction of the material recirculation (a) according to the formula 9, depending on the configuration of the aerodynamic unit: a – «separator + centrifugal collector»; b – «separator+thickening agent+centrifugal collector»; 1 – at a=0; 2 – at a=0,5; 3 – at a=0,9

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