Technologies to reduce environmental burdens. Evolutions in Europe

Buttiens, K.; Pressigny, Y. de Lassat de; Quièvrecourt, B. de

doi:10.1051/metal:2003175

Cited by 2 publications

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“…11) German HKM developed LEEP technology in 2003, which mainly reused the tail part of waste gas and accounted for about 47%. 12) Two years later, Linz steel company cooperated with Siemens VAI created a new type of flue gas recirculation technology which called EPOSINT. 13,14) The recycled flue gas was from the specific position where the temperature and concentrations of gas were high.…”

Section: Introductionmentioning

confidence: 99%

Appropriate Technology Parameters of Iron Ore Sintering Process with Flue Gas Recirculation

Fan

Gan

et al. 2014

ISIJ Int.

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Flue gas recirculation (FGR) is being introduced into the sintering process with the aim of reducing the emissions of pollutants. The influences of FRG ratio and circulating flue gas properties such as components, contents and temperature on sintering process are researched. The results show that a cleaning production with good sinter indexes can be obtained in the case of FGR ratio of 30-40%. As the circulating flue gas passes through the sintering bed, the combustion speed of fuel is reduced with O2 content decreasing; CO in circulating flue gas can be reused due to its post-combustion in the sinter zone; the combustion speed and efficiency of fuel are reduced if CO2 content is too high; the velocity of gas-solid heat transfer is increased while the condensation at over-wet zone is intensified with the increase of H2O(g) content; and the thermal state of sintering bed is improved if the temperature of circulating flue gas is not too high. The sinter indices can be maintained in case of FGR with 15 vol%O2, 6 vol%CO2, less than 8 vol%H2O(g) and 150-250°C of inlet gas.

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Section: Introductionmentioning

confidence: 99%

Appropriate Technology Parameters of Iron Ore Sintering Process with Flue Gas Recirculation

Fan

Gan

et al. 2014

ISIJ Int.

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Preparation of high-strength biochar composite briquette for blast furnace ironmaking

Zhu

Tang

et al. 2021

Metall. Res. Technol.

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In this research, using iron-oxide fines (average size: 2.5 μm) and biochar fines (average size: 50.0 μm), the biochar composite briquette (BCB) for blast furnace (BF) application was prepared by cold briquetting followed by heat treatment. The preparing conditions were optimized regarding its cold crushing strength. Anti-pulverization capability, reaction development, and structure evolution of the optimally-designed BCB under simulated BF conditions were then examined. Results of optimizing BCB preparation conditions showed that a heating temperature of 1073 K was optimal for preparing the BCB. The optimally-designed BCB contained 11.10 wt.% carbon, 72.21 wt.% Fe3O4, 11.25 wt.% FeO, and 0.77 wt.% Fe, 6.44 wt.% gangue, and had a cold crushing strength of 1800 N/briquette. Results of BCB behavior under simulated BF conditions showed that the cold crushing strength after partial reaction of the BCB ranged from 1500 N/briquette to 5500 N/briquette and its maximum volume shrinkage degree was 0.45. The high anti-pulverization capability of the BCB was supported by the slag matrix or the iron network. Under the simulated BF conditions, the BCB underwent five stages of reduction by atmosphere, partial self-reduction and reduction by atmosphere, full self-reduction, partial self-reduction and gasification by atmosphere, and gasification by atmosphere. It is inferred from the experimental findings that, by charging the BCB in BF, an increase of top gas utilization efficiency could be realized, and a favorable influence on lowering the temperature level of the thermal reserve zone could be obtained.

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Technologies to reduce environmental burdens. Evolutions in Europe

Cited by 2 publications

References 0 publications

Appropriate Technology Parameters of Iron Ore Sintering Process with Flue Gas Recirculation

Appropriate Technology Parameters of Iron Ore Sintering Process with Flue Gas Recirculation

Preparation of high-strength biochar composite briquette for blast furnace ironmaking

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