Thermally Activated Chemical Technology Processes of Agglomeration of Phosphorites

Бобков, В. И.; Borisov, Vadim; Дли, М. И.; Мешалкин, В. П.

doi:10.1134/s0040579518010025

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…-ρ m (du/dτ) = ρ g W g (dx w /dy), (5) where ρ m -material density; ρ g -gas density. Thereby we integrate with initial conditions y = 0,…”

Section: Methodsmentioning

confidence: 99%

“…Pressure of gases varies along depth of the layer and cam be described by the equation with the remark for non-isothermality: 0,33 2 Pr 1 422 1. 5 1 Re Pr…”

Section: Methodsmentioning

confidence: 99%

“…Processing of complicated and heterogeneous raw materials in iron and steel industry needs their preliminary thermal processing in order to provide meeting by raw materials all required technological properties as well as homogeneity in granulometric composition, absence of hygroscopic and chemically bound water, containing of minimal amount of carbonates, gaseous and harmful impurities [3,4]. Different physical and chemical endothermic transformations conduct simultaneously at different layer heights during charge sintering in the layer [5]: moisture evaporation, firing of coke particles, dissociation of carbonates and other chemical reactions, coke burning and melting of charge particles, appearance of sintering cake, condensation of moisture vapours in the lower layers. All these processes depend on heat exchange conditions in the layer [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Mathematical simulation of chemical and energotechnological processes and procedures of coke fines burning in agglomerated layer

Мешалкин¹,

Бобков²,

Дли³

et al. 2020

cisisr

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The paper is devoted to chemical and metallurgical processes of pelletizing of iron ore raw material. Thermally activated chemical and energotechnological processes of raw material sintering in iron and steel industry are considered, as well as mathematical models for their description, taking into account the following physical and chemical transformations: moisture evaporation, firing of coke fines, dissociation of carbonates, burning of coke fines, melting of charge particles, appearance of sintering cake, condensation of moisture vapours in the lower levels of the agglomerated layer of sinter charge. The features of conducting of these processes in different levels of agglomerated layer are researched. The results of analysis of the effect of fuel firing procedure in the hearth of a sintering machine on sintering process and the results of forming of the burning area and period of stable burning (i.e. finishing time of firing process) are examined. The effect of the following parameters: initial stage of the reaction front dissemination during dissociation of carbonates, burning-out of coke fines, oxygen consumption for the sintering process are investigated. The relationship between firing time of agglomerated layer (from one side) and heat-carrying gas consumption and temperature of burning products (from other side) is presented.

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“…-ρ m (du/dτ) = ρ g W g (dx w /dy), (5) where ρ m -material density; ρ g -gas density. Thereby we integrate with initial conditions y = 0,…”

Section: Methodsmentioning

confidence: 99%

“…Pressure of gases varies along depth of the layer and cam be described by the equation with the remark for non-isothermality: 0,33 2 Pr 1 422 1. 5 1 Re Pr…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mathematical simulation of chemical and energotechnological processes and procedures of coke fines burning in agglomerated layer

Мешалкин¹,

Бобков²,

Дли³

et al. 2020

cisisr

Self Cite

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show abstract

“…Models of particle sintering during the processing of minerals are proposed in [274,275]. The interaction of a carbon surface with liquid slag is usually considered in the context of high-temperature processes, such as coal gasification, when fuel particles can be captured by a slag film [276].…”

Section: Interfacial Interactionsmentioning

confidence: 99%

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Donskoy

2023

Energies

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The article provides state-of-the-art research on agglomeration processes during fixed-bed combustion and gasification of low-grade fuels such as biomass and waste (primarily plastic-containing waste). Such fuels demonstrate complex thermal behaviour: their decomposition and combustion are multistage, accompanied by phase transitions, and may lead to fixed-bed mechanical instability and the non-uniformity of air distribution over the cross-section. To clarify the role of physicochemical factors (fuel composition and properties, reactor conditions), data from different sources are compared. The review shows that the fixed-bed agglomeration regimes can, in a rough approximation, be classified by the sintering mechanism (due to the melting of the mineral part or the organic part), with the following search for each mechanism realisation conditions by comparing the fuel properties and characteristic temperatures. Attempts to theoretically describe and numerically simulate the agglomeration phenomenon as a change in the structure of a reacting dispersed medium are also considered: the main directions in which such approaches can be developed are indicated.

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“…In general case, it is necessary to evaluate heat capacity of charge material c m for assessment of sintering and agglomerate fabrication speed, taking into account kinetic features of phase transformations in charge, fuel burning and non-isothermal processes of carbonates dissociation with heat effects of decomposition of СаСО 3 (Q = 1778 kJ/kg) и MgСО 3 (Q = 1395 kJ/kg). Kinetics of decarbonization is considered by the authors in [11,12] and obtained results were used for analysis of dissociation processes of carbonates during agglomeration.…”

Section: Physical and Chemical Transformations In Raw Materials During Agglomerationmentioning

confidence: 99%

Analysis of chemical-metallurgical agglomeration processes during charge sintering

Бобков¹,

Дли²,

Sokolov³

et al. 2020

cisisr

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Thermally activated chemical and metallurgical processes of lumping of fine-dispersed iron ore raw material during sintering are examined in the work. The following processes are included: moisture removal, ignition of coke fines and burn-off of carbonates, taking into account burning features of coke fines, fusion of grain charge, forming of agglomeration cake, creation of overhumidification area in sintering layer owing to condensation of water vapours in washout of heat-carrying gas. Parameters of sintering kinetics are obtained experimentally, other parameters characterizing layer shrinkage of sintering charge are presented. It was established that the temperature in the sintering area has substantial effect on shrinkage. The presented temperature relationship describes experimental data with sufficient precision. The values of power exchange coefficients in the drying area are examined. The criteria equations of heat and mass exchange are presented. The mathematical model using empiric material is proposed; it describes sintering kinetics for agglomeration charge, taking into account layer shrinkage and variation of head losses in technological areas of fusion and forming of ready agglomerate, what corresponds well with the experimental data. Multi-factor relationship between chemical and metallurgical processes (from one side) and heat and mass exchange in the sintering layer of agglomeration charge (from other side) is noted. Adequacy of mathematical models allows to use them for analysis of high-efficient conditions of agglomerate fabrication. The research was conducted under financial support of the Russian Foundation of Basic Research (RFFI within the framework of the scientific project No. 18-29-24094 МК and in accordance with the State assignment, the project No. FSWF-2020-0019.

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Thermally Activated Chemical Technology Processes of Agglomeration of Phosphorites

Cited by 4 publications

References 10 publications

Mathematical simulation of chemical and energotechnological processes and procedures of coke fines burning in agglomerated layer

Mathematical simulation of chemical and energotechnological processes and procedures of coke fines burning in agglomerated layer

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Analysis of chemical-metallurgical agglomeration processes during charge sintering

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