Application of biomass fuel in iron ore sintering: influencing mechanism and emission reduction

Gan, Min; Fan, Xiaohui; Ji, Zhiyun; Jiang, Tao; Chen, X.; Yu, Zhibin; Li, Guanghui; Liang, Yin

doi:10.1179/1743281214y.0000000194

Cited by 40 publications

(21 citation statements)

References 8 publications

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“…The main fuel used in sintering process is the undersize coke or coke breeze which is generated during coke screening. Sintering contributes to the total iron and steel industry CO 2 emission by approximately 10% [52]. The CO 2 in this case is a result of combustion of coke breeze and the calcination of limestone for example.…”

Section: Sinteringmentioning

confidence: 99%

“…Such decrease in post combustion results in lowering the combustion zone temperature by 150 • C (from~1390 • C in case of coke breeze to~1240 • C in case of bio-char). Other researchers have demonstrated that up to 40% bio-char can replace coke breeze without negatively affecting the process [52]. The replacement ratio can be further increased through utilization of composites of coke and bio-char [50].…”

Section: Sinteringmentioning

confidence: 99%

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New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

Ahmed

2018

Minerals

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The iron and steel industry is still dependent on fossil coking coal. About 70% of the total steel production relies directly on fossil coal and coke inputs. Therefore, steel production contributes by ~7% of the global CO2 emission. The reduction of CO2 emission has been given highest priority by the iron- and steel-making sector due to the commitment of governments to mitigate CO2 emission according to Kyoto protocol. Utilization of auxiliary carbonaceous materials in the blast furnace and other iron-making technologies is one of the most efficient options to reduce the coke consumption and, consequently, the CO2 emission. The present review gives an insight of the trends in the applications of auxiliary carbon-bearing material in iron-making processes. Partial substitution of top charged coke by nut coke, lump charcoal, or carbon composite agglomerates were found to not only decrease the dependency on virgin fossil carbon, but also improve the blast furnace performance and increase the productivity. Partial or complete substitution of pulverized coal by waste plastics or renewable carbon-bearing materials like waste plastics or biomass help in mitigating the CO2 emission due to its high H2 content compared to fossil carbon. Injecting such reactive materials results in improved combustion and reduced coke consumption. Moreover, utilization of integrated steel plant fines and gases becomes necessary to achieve profitability to steel mill operation from both economic and environmental aspects. Recycling of such results in recovering the valuable components and thereby decrease the energy consumption and the need of landfills at the steel plants as well as reduce the consumption of virgin materials and reduce CO2 emission. On the other hand, developed technologies for iron-making rather than blast furnace opens a window and provide a good opportunity to utilize auxiliary carbon-bearing materials that are difficult to utilize in conventional blast furnace iron-making.

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Section: Sinteringmentioning

confidence: 99%

Section: Sinteringmentioning

confidence: 99%

New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

Ahmed

2018

Minerals

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“…These methods to control NOx contain selective catalytic reduction, 17) selective non-catalytic reduction, 18) flue gas recirculation, 19) process parameter control, 20,21) modification of fuel, 22) as well as biomass utilization, etc. 23,24) Flue gas recirculation sintering is a potential method to reduce NOx emissions. It has many advantages including decreasing fuel consumption and pollutant emissions, etc.…”

Section: Effects Of Temperature and Circulating Flue Gas Components On Combustion And No X Emissions Characteristics Of Four Types Quasi-mentioning

confidence: 99%

Effects of Temperature and Circulating Flue Gas Components on Combustion and NO<i><sub>x</sub></i> Emissions Characteristics of Four Types Quasi-particles in Iron Ore Sintering Process

Zhou

Cheng

et al. 2018

ISIJ International

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“…Moreover, SO 2 and NOx emissions during sintering account for 60% and 50% of the overall emissions of SO 2 and NOx in steel production, respectively [1]. At present, new technologies for reducing NOx emission during sintering mainly include flue gas recirculation sintering (FGRS), selective catalytic reduction [2], biomass fuel [3][4][5][6], gas injection [7], and parameter control [8,9].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Coke Parameters and Circulating Flue Gas Characteristics on NOx Emission during Flue Gas Recirculation Sintering Process

et al. 2019

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The new process of flue gas recirculation, which reduces coke consumption and reducing NOx emissions, is now extensively used. Compared with traditional sintering, the characteristics of circulating flue gas and coke parameters significantly affect the combustion atmosphere and coke combustion efficiency. Based on the actual complex process of sintering machine, this study proposes a relatively comprehensive one-dimensional, unsteady mathematical model for flue gas recirculation research. The model encompasses NOx pollutant generation and reduction, as well as SO2 generation and adsorption. We focus on the effects of cyclic flue gas characteristics on the sintering-bed temperature and NOx emissions, which are rarely studied, and provide a theoretical basis for NOx emission reduction. Simulation results show that during sintering, the fuel NOx is reduced by 50% and 10% when passing through the surface of coke particles and CO, respectively. During flue gas recirculation sintering, the increase in circulating gas O2 content, temperature, and supply-gas volume cause increased combustion efficiency of coke, reducing atmosphere, and NOx content in the circulating area; the temperature of the material layer also increases significantly and the sintering endpoint advances. During cyclic sintering, the small coke size and increased coke content increase the char-N release rate while promoting sufficient contact of NOx with the coke surface. Consequently, the NOx reduction rate increases. Compared with the conventional sintering, the designed flue gas recirculation condition saves 3.75% of coke consumption, i.e., for 1.2 kg of solid fuel per ton of sinter, the amount of flue gas treatment is reduced by 21.64% and NOx emissions is reduced by 23.59%. Moreover, without changing the existing sintering equipment, sintering capacity increases by about 5.56%.

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Application of biomass fuel in iron ore sintering: influencing mechanism and emission reduction

Cited by 40 publications

References 8 publications

New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

Effects of Temperature and Circulating Flue Gas Components on Combustion and NO<i><sub>x</sub></i> Emissions Characteristics of Four Types Quasi-particles in Iron Ore Sintering Process

The Effects of Coke Parameters and Circulating Flue Gas Characteristics on NOx Emission during Flue Gas Recirculation Sintering Process

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