Title

STUDY ON THE DEGRADATION OF TUYERE COKE IN COREX MELTER GASIFIER

STUDY ON THE DEGRADATION OF TUYERE COKE IN COREX MELTER GASIFIER

Authorship

Wu, Keng; Zhan, Wenlong; Fu4, Ping; Liu, Qihang; Qu, Junjie; Wang, Chongmao

Wu, Keng

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Zhan, Wenlong

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Fu4, Ping

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Liu, Qihang

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Qu, Junjie

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Wang, Chongmao

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DOI

10.5151/2594-357X-22692

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Abstract

Lump coals are used in COREX process as the mainly fuel, but it is still necessary to feed a certain amount of coke to support burden and maintain adequate char bed permeability in melter gasifier. Tuyere coke samples are obtained by means of tuyere probing technology. Then, particle size analysis, microstructure analysis, permeability analysis and determination of the hot performance of tuyere coke have been undertaken to investigate coke degradation and behavior of lump coals. Results show that larger particles (>10 mm) of tuyere coke samples are mostly from charged coke deterioration and the smaller ones (<10 mm) are mostly from lump coal pyrolysis. Moreover, reducing gases produced by lump coal combustion could promote solution loss reaction leading to coke degradation. The physical and high temperature properties of char are inferior to that of charged cokes. The mainly parameter influencing char bed permeability is the char deterioration. Finally, combined with the former results, several measures are proposed to decrease the energy consumption of Corex process.

Lump coals are used in COREX process as the mainly fuel, but it is still necessary to feed a certain amount of coke to support burden and maintain adequate char bed permeability in melter gasifier. Tuyere coke samples are obtained by means of tuyere probing technology. Then, particle size analysis, microstructure analysis, permeability analysis and determination of the hot performance of tuyere coke have been undertaken to investigate coke degradation and behavior of lump coals. Results show that larger particles (>10 mm) of tuyere coke samples are mostly from charged coke deterioration and the smaller ones (<10 mm) are mostly from lump coal pyrolysis. Moreover, reducing gases produced by lump coal combustion could promote solution loss reaction leading to coke degradation. The physical and high temperature properties of char are inferior to that of charged cokes. The mainly parameter influencing char bed permeability is the char deterioration. Finally, combined with the former results, several measures are proposed to decrease the energy consumption of Corex process.

Keywords

Corex melter gasifier; Tuyere coke; Degradation; Hot performance.

Corex melter gasifier; Tuyere coke; Degradation; Hot performance.