Reduction Behavior of Sinter Based on Top Gas Recycling-Oxygen Blast Furnace

Lan, Rong-zong; Wang, Jingsong; Han, Yi-hua; She, Xuefeng; Wang, Lintao; Xue, Qingguo

doi:10.1016/s1006-706x(13)60003-5

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…Yin et al [ 106 ] used a Borist Furnace to mimic the reduction process in the shaft of the BF with low pulverized coal injection or oxygen‐enriched blast, or both oxygen enriched blast and pulverized coal injection, respectively. Zuo et al [ 107 ] studied the impact of reducing gas (H 2 and CO) on the reduction behavior of pellets in the TGR‐OBF process, whereas Lan et al [ 108 ] conducted a series of sinter reduction experiments in OBF atmosphere using the thermal balance weight loss method. The changes in reduction degree and reduction rate were investigated and the sinter reduction dynamics was also analyzed.…”

Section: Obf Experimental Researchmentioning

confidence: 99%

A Review on Explorations of the Oxygen Blast Furnace Process

Zhang

Dai

et al. 2020

steel research int.

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The oxygen blast furnace (OBF) process has been extensively studied theoretically because of the potentials of promising energy conservation and CO2 emission reduction. Herein, investigations of the OBF process are reviewed and some suggestions for its future development are presented. The main findings can be condensed into the following: static and dynamic models of the OBF should be revised to considering the newest theoretical findings in the thermodynamics and kinetics involved as well as the particular limitations of the technology. Models focusing on energy demand and emissions should be further developed and applied to enhance the design for increased efficiency and sustainability of the complicated OBF system. It will be challenging to operate the full OBF process with top gas recycling (TGR). The development of mathematical models focusing on the practical operation is therefore warranted and would provide useful tools for tackling control problems and difficulties that will arise in forthcoming industrial trials. Considering these potential challenges, a medium oxygen‐enriched blast furnace with TGR as a forerunner is suggested because its operation conditions show greater resemblance with those of the traditional blast furnace. This furthermore provides a path of transition to the use of the full OBF in industrial scale.

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Section: Obf Experimental Researchmentioning

confidence: 99%

A Review on Explorations of the Oxygen Blast Furnace Process

Zhang

Dai

et al. 2020

steel research int.

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“…Nonetheless, CO 2 capture investments cannot be neglected [17] and add an additional cost of $56/tCO 2 [18]. In addition, too much CO in gas will reduce the gas utilization [19,20]. Currently, pulverized coal injection (PCI) is still the main method used to reduce the coke rate [21].…”

Section: Introductionmentioning

confidence: 99%

Energy Conservation and CO2 Abatement Potential of a Gas-injection Blast Furnace

Qie

Lyu

Lan

et al. 2020

High Temperature Materials and Processes

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AbstractThe gas-injection blast furnace (BF) is a new iron-making technology with an injecting gas instead of traditional pulverized coal injection (PCI) and recycling of the BF top gas through a gasifier. In contrast to traditional all-coke and PCI BFs, the coke rate will depend mostly on the heat consumption in a gas-injection BF with abundant injected gas, which results in a large coke-saving potential. Based on energy conservation, carbon recycling, CO2 abatement and fuel cost, the degree of direct reduction should be between 0.2 and 0.3. In addition, in terms of the effects of the gas injected and the rich oxygen rate in the tuyere region, the optimum injection parameters were obtained, which can reduce the coke rate to 273.36 kg/tHM, carbon recycling to 100.72 kg/tHM and abate carbon dioxide emissions by 94.00 Nm3/tHM. Theoretically, the minimum total carbon consumption value is 399.73 kg/tHM. These results illustrate the great potential for carbon recycling and coke saving in gas-injection BFs without increasing total carbon consumption.

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“…Therefore, a top gas recyclingoxygen blast furnace (TGR-OBF) is considered to be a favourable way to remarkably decrease the rate of coking [6]. The TGR-OBF replaces the traditional preheating air blast by adopting oxygen blasting [7][8][9]. CO 2 is removed and returned to the BF for re-utilization.…”

Section: Introductionmentioning

confidence: 99%

A downscaling cold model for solid flow behaviour in a top gas recycling-oxygen blast furnace

Wang²,

Liu³

et al. 2020

High Temperature Materials and Processes

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The top gas recycling-oxygen blast furnace (TGR-OBF) is a reasonable method used to reduce both coke rate and energy consumption in the steel industry. An important feature of this process is shaft gas injection. This article presents an experimental study on the gas–solid flow characteristics in a TGR-OBF using a two-dimensional cold model. The experimental conditions and parameters were determined using a series of similarity criteria. The results showed that the whole flow area in the TGR-OBF can be divided into four distinct flow zones, namely, the stagnant zone, the plug flow zone in the upper part of the shaft, the converging flow zone and the quasi-stagnant flow zone, which is similar to that in a traditional blast furnace. Then the effects of batch weight and the ratio (X) of the shaft injected gas flow rate to the total gas flow rate on solid flow behaviour were investigated in detail. With the increase in batch weight, the shape of the stagnant zone tends to be shorter and thicker. Furthermore, with the increase in X value from 0 to 1, the stagnant zone gradually becomes thinner and higher. The results obtained from the experiments provide fundamental data and a validation for the discrete element method–computational fluid dynamics-coupled mathematical model for TGR-OBFs for future studies.

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Reduction Behavior of Sinter Based on Top Gas Recycling-Oxygen Blast Furnace

Cited by 19 publications

References 7 publications

A Review on Explorations of the Oxygen Blast Furnace Process

A Review on Explorations of the Oxygen Blast Furnace Process

Energy Conservation and CO2 Abatement Potential of a Gas-injection Blast Furnace

A downscaling cold model for solid flow behaviour in a top gas recycling-oxygen blast furnace

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