Mathematical Modelling of Reactions in Iron Ore/Coal Composites.

Sun, Shouyi; Lu, W.-K.

doi:10.2355/isijinternational.33.1062

Cited by 50 publications

(42 citation statements)

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“…In principle, the energy equation for heat transfer in a porous media should include conduction, radiation and convection; however, the common approach is to simplify the radiant heat transfer at higher temperatures by including it in an effective thermal conductivity term. 26,27,29 In the present study, the enthalpy of reactions were calculated using the FactSage™ software. 30 The radial thermal dispersion, i.e.…”

Section: Heat Balancementioning

confidence: 99%

Reduction of commercial hematite pellet in isothermal fixed bed—experiments and numerical modelling

Beheshti

Moosberg-Bustnes

Kennedy

et al. 2016

Ironmaking & Steelmaking

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In the present work, fixed bed reduction experiments were conducted at 1173 K over a range of H 2 /CO ratios from 0.8 to 2.0 and subsequently modelled numerically. The model consists of two one-dimensional, isothermal and time dependent models. The gas-solid reactions were kinetically modelled using a modified shrinking core approach, and the equations were solved using the commercial software COMSOL Multiphysics H . The simulation results agree with thermal gravity experimental data with an average difference of 2.5%. A sensitivity analysis was conducted using the numerical model to establish the optimum operational conditions. The effects of the reducing gas ratio and flow rate, pellet radius and porosity, and the total bed height on the overall degree of reduction were also investigated.

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Section: Heat Balancementioning

confidence: 99%

Reduction of commercial hematite pellet in isothermal fixed bed—experiments and numerical modelling

Beheshti

Moosberg-Bustnes

Kennedy

et al. 2016

Ironmaking & Steelmaking

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“…FeO n ϩX 1 CϩX 2 COϩX 3 CO 2 =FeϩxCOϩyCO 2 ........... (2) In order to intuitively see changes of the required carbon rate, the required carbon rate X 1 ϩX 2 ϩX 3 (kmol-C/kmol-Fe) is found by the following equation newly deduced in the recent experiment by defining three operating factors, namely, direct reduction degree D. R., CO gas utilization rate h CO at the furnace top, and secondary combustion rate h PC by two-stage tuyere blast.…”

Section: Increasing Compactness (Reducingmentioning

confidence: 99%

“…To date, many reports have been made on reduction behavior concerning carbon composite iron ore cold briquette from laboratory scale 2,3) to blast-furnace application. 4) Reduction of carbon composite iron ore hot briquette takes place by heating only, and is assumed to provide excellent reduction performance, but no report has been yet made on reducing and melting behaviors of carbon composite iron ore hot briquette of by heating in shaft furnace.…”

Section: Introductionmentioning

confidence: 99%

Reduction Behavior of Carbon Composite Iron Ore Hot Briquette in Shaft Furnace and Scope on Blast Furnace Performance Reinforcement

et al. 2003

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The reduction and melting behavior of carbon composite iron ore hot briquette in shaft furnace are discussed. As these agglomerates are made by the use of thermal plasticity of coal, the reduction rate by chain reactions in interface between ore and coal could be increased. The carbon composite iron ore hot briquettes achieve 95 % reduction degree in about 10-min descent time to the 1 100°C heat reserve zone bottom end and the drop of molten iron temperature is kept to 20°C. As a result, it is expected that these new agglomerates could decrease the fuel rate and discharging amount of CO 2 as well as have a possibility of extension of furnace life. Finally the paper ends by shaping the future of blast furnace on environmental phases for the new century. Especially,it is expected that carbon composite iron ore hot briquette lowers temperature of heat reserve zone and shortens the length, suggesting the possibility of shortening of the reserve zone (inactivity zone), that is, shortening of the blast furnace height.KEY WORDS: blast furnace; carbon composite iron ore briquette; hot briquetting; reaction rate; innovative ironmaking.

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“…Conductivity can be considered as an over-all result of three mechanisms, namely; conduction, convection and radiation. Sun and Lu [17] reported that the heat transfer by convection is negligible for packed beds of fine particles. Moreover, it was reported that radiation became significant for 1 mm particle size above 673 K and 0.1 mm particles above 1773 K [18].…”

Section: Thermal Diffusivity Measurementsmentioning

confidence: 99%

Gas-Solid Reaction Route toward the Production of Intermetallics from Their Corresponding Oxide Mixtures

Ahmed

Morales-Estrella

Viswanathan

et al. 2016

Metals

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Near-net shape forming of metallic components from metallic powders produced in situ from reduction of corresponding pure metal oxides has not been explored to a large extent. Such a process can be probably termed in short as the "Reduction-Sintering" process. This methodology can be especially effective in producing components containing refractory metals. Additionally, in situ production of metallic powder from complex oxides containing more than one metallic element may result in in situ alloying during reduction, possibly at lower temperatures. With this motivation, in situ reduction of complex oxides mixtures containing more than one metallic element has been investigated intensively over a period of years in the department of materials science, KTH, Sweden. This review highlights the most important features of that investigation. The investigation includes not only synthesis of intermetallics and refractory metals using the gas solid reaction route but also study the reaction kinetics and mechanism. Environmentally friendly gases like H 2 , CH 4 and N 2 were used for simultaneous reduction, carburization and nitridation, respectively. Different techniques have been utilized. A thermogravimetric analyzer was used to accurately control the process conditions and obtain reaction kinetics. The fluidized bed technique has been utilized to study the possibility of bulk production of intermetallics compared to milligrams in TGA. Carburization and nitridation of nascent formed intermetallics were successfully carried out. A novel method based on material thermal property was explored to track the reaction progress and estimate the reaction kinetics. This method implies the dynamic measure of thermal diffusivity using laser flash method. These efforts end up with a successful preparation of nanograined intermetallics like Fe-Mo and Ni-W. In addition, it ends up with simultaneous reduction and synthesis of Ni-WN and Ni-WC from their oxide mixtures in single step.

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Mathematical Modelling of Reactions in Iron Ore/Coal Composites.

Cited by 50 publications

References 0 publications

Reduction of commercial hematite pellet in isothermal fixed bed—experiments and numerical modelling

Reduction of commercial hematite pellet in isothermal fixed bed—experiments and numerical modelling

Reduction Behavior of Carbon Composite Iron Ore Hot Briquette in Shaft Furnace and Scope on Blast Furnace Performance Reinforcement

Gas-Solid Reaction Route toward the Production of Intermetallics from Their Corresponding Oxide Mixtures

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