mathematical model for sponge iron

Jan 15, 2011· Abstract. In this work, a mathematical model is developed for simulating the behavior of a direct reduction moving bed reactor for the production of sponge iron. The pellet scale model is based on a grain model with product layer resistance. The reactor is modeled through a nonisothermal, steady state, heterogeneous model.

A Mathematical Model for the Corrosion of Iron in Sulfuric Acid E. C. Gan* and Mark E. Orazem** Department of Chemical Engineering, University of ia, Charlottesville, ia 22903 ABSTRACT A mathematical model is developed for the corrosion of a rotating iron disk in sulfuric acid.

motor mathematical model, establishing a parameter variable simulation model is very easy [3–7], and the parameter can be changed during the simulation in arbitrary form. 2. ODE AND DE OF INDUCTION MOTORS CONSIDERING IRON LOSS 2.1. ODE of Induction Motors Considering Iron Loss

A mathematical model of the reformer sponge iron cycle (RESC) is presented. The model is based on a thermodynamic analysis of the process, simulating the complete hydrogen production cycle including the hydrocarbon reformer, the sponge iron reactor (SIR) and the auxiliary devices required to operate the process. A parametric process analysis is performed in order to investigate the effect of ...

A mathematical model has been developed to predict the operating behavior of an SL/RN direct reduction kiln from a knowledge of the main process variables. The model is based on steady state principles and is capable of quantitatively describing the different chemical reactions in the kiln such as reduction, Boudouard reaction, coal devolatilization, combustion in the freeboard together with ...

Conclusion: The comprehensive mathematical model described here can predict the iron transport through BBB ECs considering various possible routes from blood side to brain side. The model can also predict the transferrin and iron transport behavior in iron-enriched and iron-depleted cells, which has not been addressed in previous work.

Ram's Horn cardboard model of an interesting 3d spiral shape bounded by a helicoid and two nested cones. Regard mathématique sur Bruxelles. Student project to photograph city features of mathematical interest and model them in Cabri. Robinson Friedenthal polyhedral explorations. Geometric sculpture. Rubik's Cube Menger Sponge, Hana Bizek.

We presented the mathematical model in the iron reactor. The model was limited to Isobaric Zone and Cooling Zone termed as IZ and CZ, respectively. The simulation was done by adapting the heat and mass transfer equations. The main purpose of this paper is to estimate the temperature increasing effect of reduced-iron on sponge-iron quality.

a set of ordinary di erential equations modeling iron dynamics. We take into account the e ects of both in ammation and neocytolysis, which are known to a ect patients undergoing treatment. Keywords: mathematical model, mathematical biology, erythropoiesis, erythrocyte, red

Mar 01, 2017· A few researchers focused on sponge iron process and suggested mathematical expressions to model the temperature profile, heat transfer, fuel combustion, reduction chemistry, etc., inside the rotary kiln.

A mathematical model of the reformer sponge iron cycle (RESC) is presented. The model is based on a thermodynamic analysis of the process, simulating the complete hydrogen production cycle including the hydrocarbon reformer, the sponge iron reactor (SIR) …

May 25, 2020· A few models of iron homoeostatic were proposed in the literature. A differential equations model of iron metabolism was proposed about 40 years ago 26,27. New insights into regulatory mechanisms ...

mentioned slag volume and the residual iron oxide content in the sponge iron. The fact that hardly a test series exceeds the 60% sponge iron limit is attribu- table to the formation of agglomerates starting at about 30 to 40% of sponge iron. These agglomerates can …

Therefore, intracellular iron levels are tightly constrained by a control system of proteins. This paper contains a mathematical model, in the form of a system of five ordinary differential equations, of the core of this control system, including the labile iron pool as well as proteins that regulate uptake, storage, and export and are ...

The results show that sponge iron gradually melts into liquid molten iron as the solid charge decreases when the temperature difference between sponge iron and lump coal and flux is relatively large, To the bottom of the packed bed, hot metal temperature is up to 1 774 K. ... In this paper, a one-dimensional steady-state mathematical model of a ...

An improved mathematical model that can reproduce the kinetics of melting of a pellet of sponge iron immersed in a slag bath was successfully developed. The model is robust as it was validated with experimental and analytical results existing in the literature. According to the model,

producing sponge iron. The aim of the present study is to investigate the effect of reduction gas composition and temperature on quality and capacity of sponge iron products through mathematical modeling arrangement and simulation. Simultaneous mass

Mathematical model for sponge iron production in gas fired Rotary Hearth Furnace. November 2019; ... a mathematical model was developed with the energy …

Four different applications of the sponge iron reaction have been considered within this initial study. The applications were investigated with a detailed thermodynamic model, comprising of components models of the sponge iron reactor (SIR), the hydrocarbon reformer, and the different auxiliary devices required to operate the process. Results ...

The kinetics of direct reduction reaction plays an important role in sponge iron reduction zone mathematical model. Unreacted core model proposed by Levenspiel is widely used for kinetics model of iron reduction in which the reaction occurs first at the outer skin of the particle. The zone of reaction then moves into the solid and may leave ...

Iron is tightly regulated in cells, and some insightful mathematical models involving iron metabolism, traf-ficking and regulation have been developed. Twenty years ago, Omholt et al. designed and analyzed a model of the IRP/IRE iron regulatory system in mammalian cells [10]. More recently, Mobilia et al. developed a simi-

A mathematical model has been developed by coupling genetic algorithm (GA) with heat and material balance equations to estimate rate parameters and solid-phase evolution related to the reduction of iron ore-coal composite pellets in a multi-layer bed Rotary hearth Furnace (RHF).

Oct 09, 2018· 2. Mathematical Model 2.1. Principle The reduction of hematite ore to iron occurs via two intermediate oxides, namely, magnetite and wüstite (considered as Fe 0.95O [19]), and by two gaseous reactants, namely, H 2 and CO. The following six reduction reactions were therefore considered: 3Fe 6O 7( q)+H 6( e)→2Fe 7O 8( q)+H 6O( e) (1) Fe 7O 8 ...

Mathematical modellingin rotary kiln sponge iron making 51 what is a model 52 what is a mathematical model 53 how can we make a useful mathematical model 54 example of a small mathematical model 55 roal of coal in rotary kiln sponge iron making process 56 quantity of protective char 57 reduction of iron oxide 58 coal.

In this work a mathematical model was developed to predict the melting kinetics of an isolated sponge iron pellet in a bath of non-reactive liquid slag. The model represents an incipient stage of modeling of a real process in an industrial scale electric arc furnace. The model was validated by computing the melting

Utilization of mathematical model for the optimization of production, especially the production of billet steels has been done by many researchers, including ... filling and blending sponge iron, iron and hot scrap bracket iron in the bucket; smelting in the Electric Arc Furnace;

Oct 05, 2011· Franzone PC, Paganuzzi A, Stefanelli M (1982). A mathematical model of iron metabolism. J Math Biol 15, 173–201. CAS Article Google Scholar Ganz T (2011). Hepcidin and iron regulation, 10 years ...

Keywords: Sponge Iron, Heat Transfer, Rotary Kiln . 1. Introduction . In Rotary kiln, carbon is charged from either end, in one end in the form of coal particles and in another in form of coal lumps. The coal reacts with air to form carbon monoxide which then reduces iron oxide (ore) to iron. So, in a kiln,

The mathematical modeling of hydrocephalus is a relatively young field. The discipline evolved from Hakim's initial description of the brain as a water-filled sponge. Nagashima and colleagues subsequently translated this description into a computer-driven model by defining five important system rules.

The sponge iron or Direct Reduced Iron (DRI) is an important feedstock in the Electric Arc Furnace (EAF). ... A mathematical model for solid particle melting in a metal or slag bath was developed ...