Influence of top gas recycling technology on operation parameters and CO 2 emission of COREX process

Abstract

Top gas recycling technology is an effective means to reduce fuel consumption and CO₂ emission in the ironmaking field. In this work, a static mathematical model of COREX process combined with top gas recycling technology is developed based on material and energy balance. The influence of three types of top gas recycling, such as the recycle gas without CO₂ removal (RG-1), the recycle gas after CO₂ removal (RG-2) and the heated recycle gas after CO₂ removal (RG-3), on the operation parameters and CO₂ emissionsis investigated. Results show that the theoretical combustion temperature can be significantly reduced by injecting the three kinds of recycle gas at tuyere. The fuel rate and integrated fuel rate can be decreased by injecting the three kinds of recycle gas. The injection of the RG-3 can most effectively reduce the CO₂ emission of COREX process, followed by the RG-2 and RG-1.

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References

Liu

Zhang

Yang

TJ.

Low carbon operation of super-large blast furnaces in China. ISIJ Int. 2015;55(6):1146–1156.

International Energy Agency . Global energy & CO₂ status report 2019. [cited 2019 Mar]. Available from: https://www.iea.org/reports/global-energy-CO2-status-report-2019

Wei

Wang

et al. Socioeconomic impact assessment of China’s CO₂ emissions peak prior to 2030. J Clean Prod. 2017;142(4):2227–2236.

Yagi

et al. Prediction of pre-reduction shaft furnace with top gas recycling technology aiming to cut down CO₂ emission. ISIJ Int. 2011;51(8):1344–1352.

Arasto

Tsupari

Kärki

et al. Oxygen blast furnace with CO₂ capture and storage at an integrated steel mill—Part I: technical concept analysis. Int J Greenhouse Gas Control. 2014;30:140–147.

Assis

Guo

Fang

et al. Optimisation of COREX process. Ironmak Steelmak. 2008;35(4):303–307.

Han

et al. Comparison of CO₂ emission between COREX and blast furnace iron-making system. J Environ Sci. 2009;21(Supplement 1):S116–S120.

Ziebik

Lampert

Szega

Energy analysis of a blast-furnace system operating with the corex process and CO₂ removal. Energy. 2008;33(2):199–205.

Lampert

Ziebik

Stanek

Thermoeconomical analysis of CO₂ removal from the corex export gas and its integration with the blast-furnace assembly and metallurgical combined heat and power (CHP) plant. Energy. 2010;35(2):1188–1195.

10.

Zhang

Xue

Zhang

et al. Medium oxygen enriched blast furnace with top gas recycling strategy. J Iron Steel Res Int. 2017;24(8):778–786.

11.

Zhang

Wang

Shao

et al. Comprehensive mathematical model and optimum process parameters of nitrogen free blast furnace. J Iron Steel Res Int. 2014;21(2):151–158.

12.

Zhang

Xue

ZL.

Exergy analyses of the oxygen blast furnace with top gas recycling process. Energy. 2017;121:135–146.

13.

Jin

Jiang

Bao

et al. Mathematical modeling of the energy consumption and carbon emission for the oxygen blast furnace with top gas recycling. Steel Res Int. 2016;87(3):320–329.

14.

Zhang

Luo

Zou

ZS.

Numerical analysis on performance of COREX CGD shaft furnace with top gas recycling. ISIJ Int. 2019;59(11):1972–1981.

15.

Kuramochi

Ramírez

Turkenburg

et al. Comparative assessment of CO₂ capture technologies for carbon-intensive industrial processes. Prog Energy Combust Sci. 2012;38(1):87–112.

16.

Zou

Guo

Wang

et al. Discussion of calculation method of BF’s CO₂ emission. J Cent South Univ (Sci Technol). 2012;43(S1):257–261.

17.

Shangguan

Zhang

et al. Discussion on the CO₂ emission calculation methods in iron and steel industry. J Iron Steel Res. 2010;22(11):1–5, 10.

18.

Zou

Xiao

YP.

A comprehensive static model for COREX process. ISIJ Int. 2012;52(12):2186–2193.

19.

Sun

Kou

et al. Influence of operation parameters on dome temperature of COREX melter gasifier. ISIJ Int. 2014;54(1):43–48.

20.

Zhang

et al. Analysis on inherent characteristics and behavior of recycling dust in freeboard of COREX melter gasifier. ISIJ Int. 2014;54(12):2737–2745.