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Abstract

COREX is the first industrialized non-blast furnace ironmaking process in the world. The melter gasifier, where final reduction of iron ore and melting of direct reduction iron take place, plays an important role in the process. In this paper, a three-dimensional mathematical model is used to simulate the combustion process of dust in the dome of a COREX gasifier. The model geometry covers oxygen spray gun, dust spray gun, top wall surface and raw gas outlet of the melter gasifier. The typical phenomena of in-gasifier aerodynamics and physicochemical behaviours relevant to the injection of dust with different granularity are simulated, in terms of ﬂow, temperature, gas composition and coal combustion characteristics. The results show the dust particle size has a certain impact on the dust combustion. With the increase in the dust particle size, the dust burning rate and the dome temperature decreases, while the reducing gas concentration increases.

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References

Luo

Zou

et al. Mathematical simulation of burden distribution in COREX melter gasifier by discrete element method. J Iron Steel Res Int. 2012;19:36–42. doi: 10.1016/S1006-706X(13)60006-0

Yang

et al. Basic characteristics of the shaft furnace of COREX® smelting reduction process based on iron oxides reduction simulation. ISIJ Int. 2010;50:1032–1039. doi: 10.2355/isijinternational.50.1032

Liu

WG.

Operation status quo and technical problems of COREX-3000. Baosteel Technol. 2008;6:11–18.

Kumar

Gupta

Naha

et al. Factors affecting fuel rate in Corex process. Ironmak Steelmak. 2006;33:293–298. doi: 10.1179/174328106X101493

Wang

Bai

et al. Influence of bed condition on gas flow in Corex melter gasifier. Ironmak Steelmak. 2009;36:590–596. doi: 10.1179/174328109X461356

Liu

Pan

Wang

et al. Mathematical model of lump coal falling in the freeboard zone of the COREX melter gasifier. Energy Fuels. 2011;25:5729–5735. doi: 10.1021/ef201278q

Pan

Liu

Wen

Three-dimensional numerical study of combustion of char in raceway of COREX melter/gasifier. Ironmak Steelmak. 2013;40:255–262. doi: 10.1179/1743281212Y.0000000027

Zhou

Wang

Jin

et al. Mechanism analysis on the pulverized coal combustion flame stability and NOx emission in a swirl burner with deep air staging. J Energy Ins. 2018.

Shen

Shiozawa

Austin

et al. Model study of the effect of bird’s nest on transport phenomena in the raceway of an ironmaking blast furnace. Miner Eng. 2014;63:91–99. doi: 10.1016/j.mineng.2014.01.008

10.

Zhou

Liu

Wang

et al. Effect of local oxygen-enrichment ways of oxygen-coal double lance on coal combustion. ISIJ Int. 2017;57:279–285. doi: 10.2355/isijinternational.ISIJINT-2016-535

11.

Berger

Weiss

Kepplinger

WL.

CFD simulation of the carbon dust combustion in the COREX® melter gasifier. Steel Res Int. 2008;79:579–585. doi: 10.1002/srin.200806169

12.

Saha

Dally

Medwell

et al. Effect of particle size on the MILD combustion characteristics of pulverised brown coal. Fuel Process Technol. 2017;155:74–87. doi: 10.1016/j.fuproc.2016.04.003

13.

Liu

Shen

Computational fluid dynamics study of biomass combustion in a simulated ironmaking blast furnace: effect of the particle shape. Energy Fuels. 2017;32:4372–4381. doi: 10.1021/acs.energyfuels.7b03150

14.

Liao

Shen

Modelling the injection of upgraded brown coals in an ironmaking blast furnace. Powder Technol. 2017;314:550–556. doi: 10.1016/j.powtec.2016.11.005

15.

Wang

Zhang

Chang

et al. Structural features and gasification reactivity of biomass chars pyrolyzed in different atmospheres at high temperature. Energy. 2018;147:25–35. doi: 10.1016/j.energy.2018.01.025

16.

Wang

Zhang

Shao

et al. Thermal behavior and kinetic analysis of co-combustion of waste biomass/low rank coal blends. Energy Convers Manage. 2016;124:414–426. doi: 10.1016/j.enconman.2016.07.045

17.

Ren

et al. Poisoning effects of KCl and As₂O₃ on selective catalytic reduction of NO with NH₃ over Mn-Ce/AC catalysts at low temperature. Chem Eng J. 2018;351:540–547. doi: 10.1016/j.cej.2018.06.085

18.

Zhang

et al. Analysis on inherent characteristics and behavior of recycling dust in freeboard of COREX melter gasifier. ISIJ Int. 2014;54:2737–2745. doi: 10.2355/isijinternational.54.2737

Simulation study of dust combustion in COREX gasifier dome

Abstract

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