AUTOMATION | |
ArticleName | Mathematical modelling of thermal and physical-chemical processes during sintering |
DOI | 10.17580/nfm.2018.02.09 |
ArticleAuthor | Pancnehko S. V., Bobkov V. I., Fedulov A. S., Chernovalova M. V. |
ArticleAuthorData | Branch of the National Research University “Moscow Power Engineering Institute”, Smolensk, Russia: S. V. Pancnehko, Professor, Chair of Physics
The National Research University “Moscow Power Engineering Institute”, Moscow, Russia: |
Abstract | Considered is an approach to simulation of sintering processes having regard to almost all the significant processes typical for such kind of physical-chemical effects on raw materials. Mathematical formulation of a sintering process includes the relations which allow describing the time history of fractional void volume based on rheological models of moisture evaporation from the surface of particles. There are also taken into consideration the gas pressure changes throughout the height of fractional void volume, which appear on decarbonization, coke burning, strengthening during agglomeration, heat exchange between the solid and gas phases. Analysis of the sinter green ignition modes which allow cutting down the fuel consumption has been carried out. Obtained was the behaviour of the fuel combustion front at an initial agglomeration stage until the steady coke brining conditions. The parameters of a layer relevant to the stable passing of the sintering process have been revealed. Mathematical model permits the influence of difference parameters on thermalphysic processes passing in a layer during the course of agglomeration to be qualitatively assessed. According to the results of calculations of the ignition process, the coke burning front formation occurs at a certain depth, when the combustion becomes stable. Thus, heating of the upper charge layer with finite thickness is necessary during the ignition, which agrees with practical results. Removal of moisture and dissociation of carbonates proceed almost simultaneously with coke burning and represent a narrow area throughout the height of the layer. The model provides qualitative dependences of thermal parameters of the process and permits analyzing an impact of any parameter on the behaviour of the system. The dependence of the ignition time on the gas flow rate is investigated. Reliable ignition is achieved owing to the intensification of the charge heating, while reducing the heat consumption in the furnace of a sintering machine. The model and the results of its implementation may be used both in ferrous and non-ferrous metallurgy. This work is done within the framework of a State task of the Ministry of Education and Science of the Russian Federation to perform public works in the field of scientific activities, base part of the project No. 13.9597.2017/БЧ. |
keywords | Sintering, heat exchange, gas dynamics, drying, ignition, decarbonization, agglomeration, mathematical model, ignition modes |
References | 1. Yin R. Metallurgical Process Engineering. Beijing : Metallurgical Industry Press. Berlin : Springer-Verlag, 2011. 328 p. |
Full content | Mathematical modelling of thermal and physical-chemical processes during sintering |