MODELING OF STEELMAKING IN BOF BASED ON PHYSICAL, CHEMICAL AND THERMAL PROCESSES

Description of the program realizing a computational method of  parameters of steel smelting in the oxygen converter with top feed of  blasting is provided in this article. This program was created on the  basis of system of the balance equations solved in unison by method of  iterations. For adaptation of the model the information on structure and  amount of materials, products of melting and duration of operations  which is available in passport data on heats of the BOF shop, is used.  In these conditions when determining structure and amount of slag, the mass of iron in scorification processes can be calculated on an oxygen balance taking into account the common expense of the blasting  recorded by industrial-control system in passports of heats. The program allows to predict melting parameters at change of its starting and  terminating conditions, and also to define value of uncontrollable impacts on process in structured part of the database. At the first stage the  program works out the balance equations. The oxygen consumption  on blasting going for scorification is defined. Then quantity of the oxidized elements is determined and the volume of oxygen for oxidation  is calculated. Further its quantity which went for oxidation of the iron  passing into slag is determined by a difference of the common amount  of oxygen given on blasting and which went for oxidation of elements.  Later the amount of slag is defined with all slag-forming materials and amount of the oxidized iron at the expense of blasting oxygen. At the  second stage the balance of formation of gases and oxides of iron is  calculated. At the third stage the amount of slag is determined taking  into account the consumption of each material. At the fourth stage the  amount of the received metal is calculated. At a terminating stage the  mass and heat balance is formed (how many heat came, how many it  was allocated in the course of elements oxidation and how many of it  was left with the gas heated to temperature of metal, slag). The heat  balance is considered according to ambient temperature that allows  considering reference heat effects for chemical reactions. The mass  and heat balance were adjusted on metal temperature at the end of  blasting.

oxygen and converter process,  smelting of steel,  program,   mathematical model,  model operation,  melting parameters,  charge,   siderite ore

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