Effect of Nitrogen-less Reducing Atmosphere on Permeability of Cohesive Layer in Blast Furnace

Kawashiri, Yuki; Nouchi, Taihei; Matsuno, Hidetoshi

doi:10.2355/isijinternational.isijint-2019-167

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…The effect of such low N 2 concentration on the smelting of V-Ti bearing burden by COREX is unknown, and there is a lack of basic understanding of the influence of TGR technology on the high-temperature behavior of V-Ti bearing burden. 26) Therefore, this study aims to investigate the influence of TGR technology on the COREX smeling V-Ti bearing burden. The SMD performances (SMD temperature parameters, liquid permeability, and gas permeability) of the V-Ti bearing burden with different N 2 concentrations were studied.…”

Section: Effect Of Top Gas Recycling Technology On the Softening Melt...mentioning

confidence: 99%

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

et al. 2022

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In COREX process, the top gas recycling (TGR) is an effective recovery and utilization technology for the high-quality gas by-produced from the melter gasifier, which can reduce its fuel consumption and emissions, and is of great significance to low carbon ironmaking. However, low concentration N 2 is contained in the top gas, it is unfavorable to the smelting of V-Ti bearing burden because the high temperature solid solution Ti(C, N) is formed in the semi-coke bed and deteriorates the burden permeability of the melter gasifier. The effect of N 2 concentration (0-10 vol%) on the softening, melting and dropping behavior of V-Ti bearing burden is investigated under simulated COREX conditions. Results show that the increasing N 2 concentration will promote the formation of Ti(C, N), increase the slag viscosity and its wettability to coke, greatly increase the burden dropping temperature, which reduces the slag dropping rate from 68.2% to 18.8%. In addition, slag foaming is caused and the gas permeability of V-Ti bearing burden is deteriorated. The vanadium contents of dropping iron and residual iron are decreased from 0.051 wt% and 0.166 wt% to 0.043 wt% and 0.161 wt%, when the N 2 concentration in reducing gas changes from 0 vol% to 10 vol%. If the pressure drop needs to be controlled below 20 kPa, the N 2 concentration in the reducing gas should not exceed 5 vol%, that is, the top gas injection volume should be less than 60%.

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Section: Effect Of Top Gas Recycling Technology On the Softening Melt...mentioning

confidence: 99%

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

et al. 2022

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“…Nowadays, CO 2 emission reduction has become the focus of investigation for the mitigation of climate change. As one of the most energy-intensive industries, improvement of productivity and energy efficiency at steel works has become a social obligation for the iron-and steel-making industry [1,2]. Blast furnace iron and steel-making is the process with the most energy consumption in the iron-and steel-making industry and makes up about 69% of the energy consumption and 73% of the CO 2 emission of the whole industry, while approximately 50% of the energy consumption and 52% of the CO 2 emissions of this process are generated in the blast furnace [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Shaft Tuyere Parameters on Gas Movement Behavior and Burden Reduction in Oxygen Blast Furnace

et al. 2023

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Parameters of shaft tuyere have vital effects on the gas flow distribution and working condition in the TGR-OBF, which determine the production index, CO2 emission reduction, and economic benefit. To clarify the effects of shaft tuyere parameters on gas movement behavior and burden reduction in oxygen blast furnaces, a 2D steady-state model based on actual plant conditions in China is published in this study. The shaft of the blast furnace can be divided into region I near the wall and region II close to the center, which was influenced by top gas and bosh gas, respectively. The farthest movement distance of the top gas along the radial direction was defined as the penetration depth decided by its kinetic energy ratio. As the height of shaft tuyere decreased from 5/10 L to 1/10 L, the penetration depth decreased from 1.615 m to 1.308 m, and the reduction degree of iron-bearing burden before entering the cohesive zone increased from 0.925 to 0.982. With the shaft tuyere diameters increased from 0.088 m to 0.096 m with a constant blast velocity, the penetration depth was kept elongated at 1.24 m, and the reduction degree before entering the cohesive zone increased from 0.972 to 0.983. While the blast volume of top gas was kept constant, the reduction degree before entering the cohesive zone increased from 0.969 to 0.986. When the shaft tuyere angles increased from −20° to 20°, both the distribution of temperature and CO fraction moved towards the upper shaft slightly, and the penetration depth was kept around 1.24. Under experimental conditions, a low-height shaft tuyere was appropriate for an oxygen blast furnace. Within a certain control range, the changes of shaft tuyere diameters and angles had a small effect on the oxygen blast furnace.

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A new pathway to produce hydrogen with CO capture from blast furnace gas via SOFC-SOEC integration

Kong

Zhang

et al. 2022

Energy Conversion and Management

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Effect of Nitrogen-less Reducing Atmosphere on Permeability of Cohesive Layer in Blast Furnace

Cited by 3 publications

References 13 publications

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

Effects of Shaft Tuyere Parameters on Gas Movement Behavior and Burden Reduction in Oxygen Blast Furnace

A new pathway to produce hydrogen with CO capture from blast furnace gas via SOFC-SOEC integration

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