Hazra, Sujan and Saxen, Henrik and Sengupta, Bhaskar (2013) Application of a One-Dimensional Steady-State Model for Process Supervision in Blast Furnace. In: Proceeding of the International Conference on Science and Technology of Ironmaking and Steelmaking, December 16-18, 2013, CSIR-NML Jamshedpur.
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Results from a one-dimensional steady-state thermodynamic model of the blast furnaces are presented. The model discretizes the furnace into a number of control volumes, where the rates of the chemical reactions are described by a partial approach to chemical equilibrium through a set of kinetic expressions. Given the inputs, the model adapts to change in operating condition through two parameters – a volumetric heat transfer coefficient and an approach to chemical equilibrium. Daily aggregated data from a medium-size blast furnace which uses nearly 100% pellet charge was used as inputs to the model. Before applying the data to the model, a thermodynamic process interface reconciles the data by making minimal corrections of a selected set of variables to make the inputs satisfy the material and energy balance equations. The resulting correction coefficients can be used to detect feed irregularities or instrumental errors. As for the results of the simulation model, a reserve zone with rather uniform thermal and chemical conditions in the lower shaft can be observed, as well as partly overlapping step-wise reductions of the iron oxides and a mirror relation of the CO and CO2 concentration profiles in the gas phase. On progressing further down in the furnace, an abrupt increase in the rate of the solution-loss reaction ends the reserve zone,resulting in a dramatic increase in temperatures. The time evolution of the simulated conditions helps elucidate how changes in the internal or external conditions are reflected in the state of the process, e.g., as the flow of a raw material has been changed substantially.
|Item Type:||Conference or Workshop Item (Paper)|
|Uncontrolled Keywords:||blast furnace, thermodynamic model, steady state, heat transfer, chemical equilibrium|
|Divisions:||Material Science and Technology|
|Deposited By:||Sahu A K|
|Deposited On:||14 Nov 2014 13:17|
|Last Modified:||14 Nov 2014 13:17|
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