reducibility of cobblestone and coke rate in blast furnace

The Coke and Iron Ore Materials Kinetic Characteristics

Its role increases in the process of blast furnace improving and the coke rate reduction. Reducibility is defined in accordance with Russian Federation State Standard 17212–84 (Russia

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Factors affecting Coke rate in a Blast Furnace IspatGuru

29/06/2014· Blast furnace coke rate reduces by around 2 % with the blast temperature increasing by 100 deg C. High top pressure also reduces the coke rate in the blast furnace. With every increase of top pressure of the blast furnace by 0.1 kg/sq cm there is a reduction of around 0.1 % in the coke rate.

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Coke Rate an overview ScienceDirect Topics

The present day blast furnaces use very low coke rate in view of its scarcity. The Indian blast furnaces use 507 kg coke Studies on reduction behavior of iron burden showed that reducibility of sinter and pellets increases in the presence of nut coke by several mechanisms; particularly, the nut coke solution loss reaction improves the reducing gas diffusion, and contact between reducing

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Enhancement of Iron Ore Sinter Reducibility through Coke

16)Although the injection of COG into the blast furnace is practiced in some countries with dif- ferent injection rate from about 30 to 280 m3/tHM but its effect for example on the sinter reducibility is not

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(PDF) The Coke and Iron Ore Materials Kinetic

Influence of reducibility (1) and durability (2) on the coke rate ( –– ), blast furnace productivity (- -). +2. Fields of degrees of the iron reduction Fe (%) at K V0 = 0.2 cm/s (on the

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Gas Permeability Improvement Mechanism at the Blast

A major operational problem in increasing pulverized coal rate and decreasing coke rate must be the increased pressure drop or the worsened gas permeability at the lower part of the blast furnace.

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Blast Furnace Coke Properties and DiVA portal

economy, since the blast furnace fuel rate increases and the productivity decreases.[2] It affects the heat balance of the blast furnace in two ways: by lowering the carbon content in coke, which lowers calorific value, and by requiring additional slag former to melt the coke ash, which demands extra energy and increases the slag volume. Alkalis in coke ash are usually present as silicates and

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Iron Ore Materials and Coke Quality Characteristics and

01/01/2013· Its role increases as the blast furnace improving and the coke consumption decreasing. The reducibility of the iron ore materials is defined in accordance with Russian Federation State Standard < 17212­84. Reduction is made in the vertical reactionary pipe placed in the electric furnace. The iron ore material is charged into the reactionary pipe which is hanged to the 978-3-902823-42

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Main Features of a Modern High Capacity Blast Furnace

20/09/2019· Normally, for every 1 g/Ncum of moisture removed in the hot air blast, there is a decrease in the coke rate in the range of 0.8 kg/tHM to 1 kg/tHM. In order to maintain the thermal conditions of the hearth, for every 1 g/N cum moisture removal, the rate of PCI increases by 1.5 kg/tHM to 2.0 kg/tHM.

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(PDF) Iron Ore Sintering: Quality Indices

02/05/2017· process in the blast furnace stack. Sinter reducibility is gov-erned by its porosity and mineralogical composition, as non-occluded porosity measures the surface available for gas-solid .

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Investigation of the Effects of Coke Reactivity and Iron

27/09/2020· Investigation of the E ects of Coke Reactivity and Iron Ore Reducibility on the Gas Utilization E ciency of Blast Furnace Fanchao Meng 1, Lei Shao 1,2 and Zongshu Zou 1,2,* 1 School of Metallurgy, Northeastern University, Shenyang 110819, China; [email protected] (F.M.); [email protected] (L.S.) 2 State Key Laboratory of Rolling and Automation, Northeastern

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Application of High Ratio Coke Mixed Charging Technique to

Fig. 4 Change in the reduction rate at 1 473 K with large-diameter mixed coke with a sinter ratio of 75% . JFE TECHNICAL REPORT No. 13 (May 2009) 23 Application of High Ratio Coke Mixed Charging Technique to Blast Furnace mixing ratio increases shows the same tendency as with small coke. It was found that the size ratio has virtually small effect on reducibility. From the results of

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Decreasing Coke Rate under All-Pellet Operation in Kobe No

blast furnace Kobe Works had no coke oven and purchased coke from outside. It was forced to use coke that was more expensive than that used by other ironworks. For this reason, the blast furnace operation of Kobe Works aimed at low coke-ratio operation. Also, in response to the construction of a power generation plant in the Kobe Works, its sintering plant was closed in 1999, and the process

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The Role of Reducibility in Achievement of the Minimal

The limit of perfection of a blast-furnace smelting, including in its concept a minimal theoretically possible coke consumption, is determined by a thermodynamic equilibrium of oxidation-reduction reactions in separate zones of a furnace. It is possible to determine minimum coke consumption, for example, with the use of the mathematical model suggested by us.

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Iron Ore Materials and Coke Quality Characteristics and

01/01/2013· Its role increases as the blast furnace improving and the coke consumption decreasing. The reducibility of the iron ore materials is defined in accordance with Russian Federation State Standard < 17212­84. Reduction is made in the vertical reactionary pipe placed in the electric furnace. The iron ore material is charged into the reactionary pipe which is hanged to the 978-3-902823-42

Get Price

Investigation of the Effects of Coke Reactivity and Iron

The use of coke with high reactivity in the ironmaking blast furnace (BF) has yet to be explored, and a thorough understanding is still required to clarify the effect of coke reactivity on the BF gas utilization efficiency. In this paper, a one-dimensional kinetic model of the BF is presented and the accuracy of the model is verified. The model is then applied to analyze the effect of coke

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Main Features of a Modern High Capacity Blast Furnace

20/09/2019· This in turn raises the flame temperature, promotes higher PCI rate and thus reduces the coke rate. Normally, for every 1 g/Ncum of moisture removed in the hot air blast, there is a decrease in the coke rate in the range of 0.8 kg/tHM to 1 kg/tHM. In order to maintain the thermal conditions of the hearth, for every 1 g/N cum moisture removal

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reducibility of iron ore and coke rate in blast furnace

Quality Improvement of Sintered Ore in Relation to Blast Furnace High productivity operation of a blast furnace requires enhancing reducibility and improving reduction first dripping of iron ore from a graphite crucible) and the composi- . ficient as high as 2.37 t/d/m3 and a high ore/coke rate

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Reduction of Pellets‐Nut Coke Mixture under Simulating

20/08/2010· In order to clarify the influence of nut coke on the pellets reducibility, industrial iron ore pellets were reduced with and without nut coke participation under different temperatures and atmospheres. Isothermal and non‐isothermal reduction tests under simulating blast furnace conditions were performed using an experimental laboratory rig. Furthermore, reflected light microscopy,

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Blast Furnace OSRS Wiki

The Blast Furnace is a members-only minigame situated in Keldagrim for smelting bars.The furnace here only requires half as much coal when smelting usually, so it can be useful when smelting the ores that require more coal.. There are 15 Blast Furnace worlds on Old School RuneScape, all of which make soloing the Blast Furnace easy as there are five different dwarves Dumpy, Stumpy, Pumpy

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Investigation of the Effects of Coke Reactivity and Iron

27/09/2020· Investigation of the E ects of Coke Reactivity and Iron Ore Reducibility on the Gas Utilization E ciency of Blast Furnace Fanchao Meng 1, Lei Shao 1,2 and Zongshu Zou 1,2,* 1 School of Metallurgy, Northeastern University, Shenyang 110819, China; [email protected] (F.M.); [email protected] (L.S.) 2 State Key Laboratory of Rolling and Automation, Northeastern

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Kinetics of reduction and oxidation reactions during

The principal relation between reducibility and speci c coke consumption is monitored only in qualitative explication. Mathematically statistical analysis carried out in the past on this section of blast furnace pro-cess showed considerable di erences among individual blast-furnace plants, resulting in mistrust of adequacy of statistic quantitative relations among ore reducibil-ity, coke

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(PDF) The Coke and Iron Ore Materials Kinetic

Influence of reducibility (1) and durability (2) on the coke rate ( –– ), blast furnace productivity (- -). +2. Fields of degrees of the iron reduction Fe (%) at K V0 = 0.2 cm/s (on the

Get Price

Decreasing Coke Rate under All-Pellet Operation in Kobe No

blast furnace Kobe Works had no coke oven and purchased coke from outside. It was forced to use coke that was more expensive than that used by other ironworks. For this reason, the blast furnace operation of Kobe Works aimed at low coke-ratio operation. Also, in response to the construction of a power generation plant in the Kobe Works, its sintering plant was closed in 1999, and the process

Get Price

Application of High Ratio Coke Mixed Charging Technique to

Application of High Ratio Coke Mixed Charging Technique to Blast Furnace coke was charged simultaneously from a top bunker, and the small coke was mixed with the ore by simulta- neous discharge from a bin. The coke mixing ratio was 3.75 wt% in both batches, resulting in a total of 7.5 wt%.

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The Role of Reducibility in Achievement of the Minimal

The limit of perfection of a blast-furnace smelting, including in its concept a minimal theoretically possible coke consumption, is determined by a thermodynamic equilibrium of oxidation-reduction reactions in separate zones of a furnace. It is possible to determine minimum coke consumption, for example, with the use of the mathematical model suggested by us.

Get Price

Investigation of the Effects of Coke Reactivity and Iron

The use of coke with high reactivity in the ironmaking blast furnace (BF) has yet to be explored, and a thorough understanding is still required to clarify the effect of coke reactivity on the BF gas utilization efficiency. In this paper, a one-dimensional kinetic model of the BF is presented and the accuracy of the model is verified. The model is then applied to analyze the effect of coke

Get Price

Indirect Reduction an overview ScienceDirect Topics

In the shaft, the carbon content in the iron does not exceed 1 wt% due to the slow kinetics of solid–solid reaction [ 19 ]. At high temperatures above 1000 °C, coke becomes a stronger carburization agent. However, in the liquid phase, carbon content can increase to 3.0–3.5 wt% in the belly of the blast furnace.

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Analysis of factors that limit the production rate and

29/11/2017· An engineering analysis indicates that the coke rate in present blast-furnace practice is set not by chemical or thermal needs but to give adequate charge permeability for economical driving rates. An equation showing interrelations among pressure drop, gas flow, and charge characteristics has been derived. Flooding conditions and the location of the fusion zone are discussed.

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Reduction of Pellets‐Nut Coke Mixture under Simulating

20/08/2010· In order to clarify the influence of nut coke on the pellets reducibility, industrial iron ore pellets were reduced with and without nut coke participation under different temperatures and atmospheres. Isothermal and non‐isothermal reduction tests under simulating blast furnace conditions were performed using an experimental laboratory rig. Furthermore, reflected light

Get Price
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