• Title/Summary/Keyword: iron ore sintering bed

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A Study on the Combustion Characteristics of Coke and Anthracite in an Iron Ore Sintering Bed (소결층 내에서의 코크스와 무연탄의 연소 특성 비교 연구)

  • Yang, Won;Yang, Kwang-Heok;Choi, Eung-Soo;Ri, Deog-Won;Kim, Sung-Man;Choi, Sang-Min
    • Journal of the Korean Society of Combustion
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    • v.9 no.2
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    • pp.30-37
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    • 2004
  • Coal combustion in an iron ore sintering bed is a key parameter that determines quality of the sintered ores and productivity of the process. In this study, effects of the different types of coal - coke and anthracite - on the combustion in the iron ore sintering bed are investigated by modeling and experiment. Fuel characteristics of coke and anthracite are observed through a set of basic analysis and thermo-gravimetric analysis. Coke has a higher reactivity than anthracite due to the difference of surface area and density, and these characteristics are reflected in the 1-D unsteady simulation of the iron ore sintering bed. Calculation results show that different reactivity of the fuel can affect the bed combustion.

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A Study on the Combustion Characteristics of Coke and Anthracite in an Iron Ore Sintering Bed (소결층 내에서의 코크스와 무연탄의 연소 특성 비교 연구)

  • Yang, Won;Yang, Kwang-Hcok;Choi, Sang-Min;Choi, Eung-Soo;Ri, Deok-Won;Kim, Sung-Man
    • 한국연소학회:학술대회논문집
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    • 2004.06a
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    • pp.141-148
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    • 2004
  • Coal combustion in an iron ore sintering bed is a key parameter that determines quality of the sintered ores and productivity of the process. In this study, effects of the different types of coal coke and anthracite - on the combustion in the iron ore sintering bed are investigated by modeling and experiment. Fuel characteristics of coke and anthracite are observed through a few basic analysis and thermo-gravimetric analysis. It was found that coke has a higher reactivity than anthracite due to the difference of surface area and density. Those characteristics are reflected to the 1-D unsteady simulation of the iron ore sintering bed. Calculation results show that different reactivity of the fuel can affect the bed combustion, which implies the further investigation should be performed for obtaining optimal combustion conditions in the sintering bed.

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A Quantitative Evaluation of Combustion Characteristics of Coke/Anthracite in an Iron Ore Sintering Bed (소결층 내 코크스/무연탄 연소 특성의 정량적 평가)

  • Yang, Won;Yang, Gwang-Hyeok;Choi, Sang-Min;Choe, Eung-Su;Lee, Deok-Won;Kim, Seong-Man
    • 한국연소학회:학술대회논문집
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    • 2004.11a
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    • pp.33-40
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    • 2004
  • Combustion of coke/anthracite in an iron ore sintering bed is characterized quantitatively by introducing newly defined parameters related to propagation and thickness of combustion zone and maximum temperature. The parameters are obtained by sintering pot experiment and I-D, unsteady numerical model which treats solid material as multiple solid phases. Experiments and calculations are performed for various major operating parameters: air inlet velocity, different type of fuels which have different reactivity and diameter of the solid fuel. Effects of the operating parameters on the productivity and quality of the sintering process are investigated and evaluated quantitatively and the results show that optimized air supply rate and diameter of anthracite for replacement of coke can be obtained. This approach can be applied to other kinds of combustors for characterization of the combustion in the solid fuel beds.

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Modeling of Coke Combustion and Heat Transfer in an Iron Ore Sintering Bed with Considerations of Multiple Solid Phases (다중 고체상을 고려한 소결기의 코크스 연소-열전달 모델링)

  • Yang, Won;Ryu, Chang-Kook;Choi, Sang-Min
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.79-84
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    • 2003
  • In this study we propose an unsteady I-dimensional model of an iron ore sintering bed with multiple solid phases, which confers a phase on each solid material. This model contains coke combustion, limestone decomposition, gaseous reaction, heat transfers between each phase, and geometric changes of the solid particles. Simulation results are compared with the limited experimental data set of various coke contents and air supply rates. Effect of the coke diameter is also evaluated. They predict the experimental results well and show applicabilities to the various system of the fuel bed with various solid materials.

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Modeling of Combustion and Heat Transfer in the Iron Ore Sintering Bed (제철 소결기 베드 내 연소 및 열전달 모델링)

  • Yang, Won;Ryu, Chang-Kook;Choi, Sang-Min
    • Journal of the Korean Society of Combustion
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    • v.7 no.3
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    • pp.23-31
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    • 2002
  • Processes in an iron ore sintering bed can characterized as a relatively uniform progress of fuel, cokes combustion and complicated physical change of solid particles. The sintering bed was modelled as an unsteady one-dimensional progress of the fuel layer, containing two phases: solid and gas. Coke added to the raw mix, of which the amount is about 3.5% of the total weight, was assumed to form a single particle with other components. Numerical simulations of the condition in the iron ore sintering bed were performed for various parameters: moisture contents, cokes contents and air suction rates, along with the various particle diameters of the solid for sensitivity analysis. Calculation results showed that the influence of these parameters on the bed condition should be carefully evaluated, in order to achieve self-sustaining combustion without high temperature section. The model should be extended to consider the bed structural change and multiple solid phase, which could treat the inerts and fuel particles separately.

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Application of Intra-particle Combustion Model for Iron Ore Sintering Bed (제철 소결공정에 대한 단입자 연소 모델의 응용)

  • Yang, Won;Choi, Sang-Min;Jin, Hong-Jong
    • 한국연소학회:학술대회논문집
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    • 2006.04a
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    • pp.181-188
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    • 2006
  • Operation parameters for large scale industrial facility such as iron making plant are carefully selected through elaborate tests and monitoring rather than through a mathematical modeling. One of the recent progresses for better energy utilization in iron ore sintering process is the distribution pattern of fuel inside a macro particle which is formed with fines of iron ore, coke and limestone. Results of model tests which have been used as a basis for the improved operation in the field are introduced and a theoretical modeling study is presented to supplement the experiment-based approach with fundamental arguments of physical modeling, which enables predictive computation beyond the limited region of tests and adjustment. A single fuel particle model along with one-dimensional bed combustion model of solid particles are utilized, and thermal processes of combustion and heat transfer are found to be dominant consideration in the discussions of productivity and energy utilization in the sintering process.

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Modeling of Combustion and Heat transfer in the Iron Ore Sintering Bed;Evaluation of the Calculation Results for Various Cases (제철 소결기 배드 내 연소 및 열전달 모델링;인자 변화에 의한 계산 결과 평가)

  • Yang, Won;Ryu, Chang-Kook;Choi, Sang-Min
    • 한국연소학회:학술대회논문집
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    • 2002.06a
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    • pp.171-178
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    • 2002
  • Numerical simulations of the condition in the iron ore sintering bed are performed for various parameters. The sintering bed is modelled as an unsteady one-dimensional progress of solid material, containing cokes and iron ore. Bed temperature, solid mass and gas species distributions are predicted for various parameters of moisture contents, cokes contents and air suction rates, along with the various particle diameters of the solid for sensitivity analysis. Calculation results show that influences of these parameters on the bed condition should be carefully evaluated for achievement of the self-sustaining combustion without the high temperature section, which can cause the excessive melting in the bed. It suggests that the model should be extended to consider the bed structural change and multiple solid phase, which can treat the inerts and fuel particles separately.

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Industrial Solids Processing Applications - Particle Reaction Models and Bed Reactor Models (산업용 고체 처리 공정 - 입자 반응 및 고정층 반응기 모델링)

  • Ahn, Hyungjun;Choi, Sangmin
    • Journal of the Korean Society of Combustion
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    • v.22 no.2
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    • pp.27-35
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    • 2017
  • This paper reviews the previous industrial solid bed process simulations to provide a better understanding of the modeling approaches to the particle reactions in the bed. Previous modeling studies on waste incinerator, iron ore sintering bed, blast furnace, iron ore pellet indurator, and biomass combustor can be seen on the common ground of unsteady 1-D modeling scheme. Approaches to the particle reaction modeling have been discussed in terms of the status of solid particles in the bed, types of reaction progression in a particle, and the consideration of the intra-particle temperature gradient.

Analysis of the Thermal Processes in the Iron-Making Facility - Modeling Approach (제선 설비의 열공정 해석 모델링 접근 방법)

  • Yang, Won;Ryu, Chang-Kook;Choi, Sang-Min;Choi, Eung-Soo;Ri, Deok-Won;Huh, Wan-Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.7
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    • pp.747-754
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    • 2004
  • Thermo-fluid characteristics in coke oven, sintering machine and blast furnace in iron-making facility are key processes related to the quality and productivity of the pig iron. Solid material in the processes usually forms a bed in a gas flow. For simulation of the processes by mathematical model, the solid beds are idealized to be a continuum and a reacting solid flow in the gas flow. Governing equations in the form of partial differential equations for the solid material can be constructed based on this assumption. Iron ore sintering bed is simulated and limited amount of parametric study have been performed. The results have a good agreement with the experimental results or physical phenomena, which shows the validity and applicability of the model.

Process Modeling of an Iron Ore Sintering Bed for Flue Gas Recirculation (배가스 재순환 적용을 위한 제철 소결 베드 프로세스 모델링)

  • Ahn, Hyung-Jun;Choi, Sang-Min;Cho, Byung-Kook
    • Journal of the Korean Society of Combustion
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    • v.16 no.4
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    • pp.23-30
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    • 2011
  • In the iron and steel manufacturing, sintering process precedes blast furnace to prepare feed materials by agglomerating powdered iron ore to form larger particles. There are several techniques which have devised to improve sintering production and productivity including flue gas recirculation(FGR) and additive gas enriched operation. The application of those techniques incurs variations of process configurations as well as inlet and outlet gas conditions such as temperature, composition, and flow rate which exert direct influence on reactions in the bed or the operation of the entire plant. In this study, an approach of sintering bed modeling using flowsheet process simulator was devised in consideration of FGR and the change of incoming and outgoing gas conditions. Results of modeling for both normal and FGR sintering process were compared in terms of outgoing gas temperature, concentration, and moisture distribution pattern as well as incoming gas conditions. It is expected to expand the model for various process configurations with FGR, which may provide the usefulness for design and operation of sintering plant with FGR.