Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace

In the present research, charging carbon composite briquettes (CCB) in a blast furnace (BF) was investigated. The CCB used contained 29.70 wt.% Fe<sub>3</sub>O<sub>4</sub>, 39.70 wt.%, FeO, 1.57 wt.% iron, 8.73 wt.% gangue, and 20.30 wt.% carbon. Its reaction kinetics in BF w...

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Autores principales:	Qiang Wang, Zhu Liu, Huiqing Tang, Zhancheng Guo
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	carbon composite briquette blast furnace ironmaking reaction kinetics numerical simulation coke saving Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/96a30c9c2cea4b01ab4bb923a569cdb3
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spelling	oai:doaj.org-article:96a30c9c2cea4b01ab4bb923a569cdb32021-11-25T18:21:04ZExperimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace10.3390/met111116692075-4701https://doaj.org/article/96a30c9c2cea4b01ab4bb923a569cdb32021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1669https://doaj.org/toc/2075-4701In the present research, charging carbon composite briquettes (CCB) in a blast furnace (BF) was investigated. The CCB used contained 29.70 wt.% Fe<sub>3</sub>O<sub>4</sub>, 39.70 wt.%, FeO, 1.57 wt.% iron, 8.73 wt.% gangue, and 20.30 wt.% carbon. Its reaction kinetics in BF was examined by nonisothermal tests and modeled. Thereafter, the influence of replacing 10% ore with CCB on BF performance was studied by numerical simulations. Results showed that the CCB reaction behavior in BF could be modeled using the previously proposed model under <i>a</i><sub>gs</sub> = 1900 m<sup>2</sup>·m<sup>−3</sup>. Numerical simulations on a BF with a production of 6250 t hot metal per day (tHM/day) showed that replacing 10% ore with CCB efficiently improved the BF operation for coke saving. In the CCB charging operation, the CCB reached a full iron-oxide reduction above the cohesive zone (CZ) and a carbon conversion of 85%. By charging CCB, the thermal state in the BF upper part was significantly changed while it was not influenced in the BF lower part; the ore reduction was retarded before the temperature reached 1073 K and was prompted after and the local gas utilization tends to increase above the CZ. By the CCB reduction above the CZ, BF top gas temperature was decreased by 8 K, the BF top gas utilization was increased by 1.3%, the BF productivity was decreased by 17 tHM/day, the coke rate was decreased by 52.2 kg/tHM, and ore rate was decreased by 101 kg/tHM. Considering the energy consumption of sintering and coking, charging the CCB could have a significant energy-saving and CO<sub>2</sub>-emission-reducing effect for BF iron making.Qiang WangZhu LiuHuiqing TangZhancheng GuoMDPI AGarticlecarbon composite briquetteblast furnace ironmakingreaction kineticsnumerical simulationcoke savingMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1669, p 1669 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	carbon composite briquette blast furnace ironmaking reaction kinetics numerical simulation coke saving Mining engineering. Metallurgy TN1-997
spellingShingle	carbon composite briquette blast furnace ironmaking reaction kinetics numerical simulation coke saving Mining engineering. Metallurgy TN1-997 Qiang Wang Zhu Liu Huiqing Tang Zhancheng Guo Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace
description	In the present research, charging carbon composite briquettes (CCB) in a blast furnace (BF) was investigated. The CCB used contained 29.70 wt.% Fe<sub>3</sub>O<sub>4</sub>, 39.70 wt.%, FeO, 1.57 wt.% iron, 8.73 wt.% gangue, and 20.30 wt.% carbon. Its reaction kinetics in BF was examined by nonisothermal tests and modeled. Thereafter, the influence of replacing 10% ore with CCB on BF performance was studied by numerical simulations. Results showed that the CCB reaction behavior in BF could be modeled using the previously proposed model under <i>a</i><sub>gs</sub> = 1900 m<sup>2</sup>·m<sup>−3</sup>. Numerical simulations on a BF with a production of 6250 t hot metal per day (tHM/day) showed that replacing 10% ore with CCB efficiently improved the BF operation for coke saving. In the CCB charging operation, the CCB reached a full iron-oxide reduction above the cohesive zone (CZ) and a carbon conversion of 85%. By charging CCB, the thermal state in the BF upper part was significantly changed while it was not influenced in the BF lower part; the ore reduction was retarded before the temperature reached 1073 K and was prompted after and the local gas utilization tends to increase above the CZ. By the CCB reduction above the CZ, BF top gas temperature was decreased by 8 K, the BF top gas utilization was increased by 1.3%, the BF productivity was decreased by 17 tHM/day, the coke rate was decreased by 52.2 kg/tHM, and ore rate was decreased by 101 kg/tHM. Considering the energy consumption of sintering and coking, charging the CCB could have a significant energy-saving and CO<sub>2</sub>-emission-reducing effect for BF iron making.
format	article
author	Qiang Wang Zhu Liu Huiqing Tang Zhancheng Guo
author_facet	Qiang Wang Zhu Liu Huiqing Tang Zhancheng Guo
author_sort	Qiang Wang
title	Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace
title_short	Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace
title_full	Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace
title_fullStr	Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace
title_full_unstemmed	Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace
title_sort	experimental and numerical investigations on charging carbon composite briquettes in a blast furnace
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/96a30c9c2cea4b01ab4bb923a569cdb3
work_keys_str_mv	AT qiangwang experimentalandnumericalinvestigationsonchargingcarboncompositebriquettesinablastfurnace AT zhuliu experimentalandnumericalinvestigationsonchargingcarboncompositebriquettesinablastfurnace AT huiqingtang experimentalandnumericalinvestigationsonchargingcarboncompositebriquettesinablastfurnace AT zhanchengguo experimentalandnumericalinvestigationsonchargingcarboncompositebriquettesinablastfurnace
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Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace

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