On Mathematical Modeling of Layer Metallurgical Furnaces and Aggregates. Report 2

Shvydkii, V. S.; Фатхутдинов, А. Р.; Девятых, Е. А.; Девятых, Т. О.; Спирин, Н. А.

doi:10.17073/0368-0797-2017-1-19-23

Cited by 5 publications

(2 citation statements)

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“…At the mid-temperature stage, the oxidation rate decreases, which is associated with the removal of hydration moisture and the dissociation of carbonates. The temperature ranges of individual stages of pellet oxidation depend on their basicity and, with an increase in the heating rate, shift to the region of higher temperatures [20,21].…”

Section: Methodsmentioning

confidence: 99%

Analysis of the Granulometric Composition of the Feedstock Influence on Mechanical Properties of Iron Ore Pellets

Бобков

Morgunova

2022

MSF

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The paper investigates the effect of high-temperature roasting and cooling modes of roasted iron ore pellets on their strength and porosity. These characteristics depend on the initial iron ore raw materials properties, the parameters of the raw pellets, the firing temperature, the holding time at this temperature, the heating and cooling rate, and take into account the change in these indicators in connection with the chemical and mineralogical compositions of the pellets. It has been established that the strength of iron ore pellets obtained at the optimum firing temperature depends on the characteristics of the initial finely dispersed iron ore raw material. The relationship between the content of draw rock and the strength of calcined pellets has been revealed. A significant influence of the raw pellets porosity on the strength of the calcined pellets was found. It is shown that the crushing strength of pellets cooled in air is higher than the strength of pellets cooled with water, and a decrease in the final cooling temperature leads to an increase in the strength of the pellets. It is substantiated that the heating rate should not exceed the rate of gas diffusion, and with a decrease in the size of finely dispersed iron ore raw materials, the shrinkage of the pellet layer increases during heating. It is shown that shrinkage appears at temperatures lower than the optimal calcining temperature and insignificantly affects the strength of the pellets. The results obtained can be used to substantiate resource-and-energy efficient operating modes of horizontal-grate machines in ferrous metallurgy.

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Section: Methodsmentioning

confidence: 99%

Analysis of the Granulometric Composition of the Feedstock Influence on Mechanical Properties of Iron Ore Pellets

Бобков

Morgunova

2022

MSF

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“…The researches in the field of improvement of iron ore raw materials processing technologies in the layer can be divided by two main groups [5,6]. The works connected with mathematical simulation of heat exchange processes and analysis of the obtained exact and approximate values can be related to the first group [7,8].…”

Section: Introductionmentioning

confidence: 99%

Experimental examination of the chemical-metallurgical roasting process for iron ore raw materials on the fire grate of a roasting conveyor machine

Bobkov,

Dli,

Kulyasov

2023

cisisr

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The results of experimental power engineering examination of operating roasting conveyor machines are presented. These machines are used for complicated energy-intensive chemical-metallurgical process of roasting of iron ore raw materials in moving dense layer with cross feed of heat-carrying gas. The studies were conducted within the temperature ranges of thermal and aerodynamic operating conditions of the existing roasting conveyor machines. The causes of insufficient power engineering efficiency of the chemical-metallurgical roasting process were revealed, qualitative analysis of thermal conditions of roasting dense layer of iron ore raw materials was carried out. The data on temperature distribution of heating gas and iron ore material in different areas of a dynamic dense layer and on a fire grate in different sections of the roasting machine were obtained. The experimental data from technological control of the roasting conveyor machine were presented, as well as the results of chemical and granulometric analyses of roasting iron ore raw materials. Essential deviations in the thermal conditions of operating roasting machine in comparison with designed parameters were found out. The data on roasting conditions of iron ore raw materials in the experimental unit -the sintering pan, which provides simulation of the roasting conditions close to designed ones, are displayed. Insufficient heating in the lower layer levels at the operating roasting machines (in comparison with the designed parameters), stipulated by low speed of heat-carrying gas sweeping in the roasting area was revealed. Temperature heterogeneity along the width of a fire grate, caused by heterogeneity of heat-carrying gas sweeping due to segregation of iron ore material by its size during its loading to the roasting conveyor machine was substantiated scientifically.

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Calculation Features for the Heat and Power Balance in the Cyber-Physical System of Pellets Roasting on the Roasting Machine Conveyor

Бобков

Дли

2022

Cyber-Physical Systems: Modelling and Industrial Application

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On Mathematical Modeling of Layer Metallurgical Furnaces and Aggregates. Report 2

Cited by 5 publications

References 0 publications

Analysis of the Granulometric Composition of the Feedstock Influence on Mechanical Properties of Iron Ore Pellets

Analysis of the Granulometric Composition of the Feedstock Influence on Mechanical Properties of Iron Ore Pellets

Experimental examination of the chemical-metallurgical roasting process for iron ore raw materials on the fire grate of a roasting conveyor machine

Calculation Features for the Heat and Power Balance in the Cyber-Physical System of Pellets Roasting on the Roasting Machine Conveyor

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