ISSN 2594-357X
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Abstract
The raceway plays an important role in the mass and heat transportation inside the Corex melter gasifier (MG). Due to the fact that pure oxygen instead of air is injected into MG, it is of great importance to study the raceway phenomenon of MG and few works related to the subject have been reported before. Present work investigated gas velocity, species and temperature distribution behaviors in both raceway and coke bed regions by introducing a two-dimensional mathematical model at steady state. The influences of production rate and gas composition on above behaviors were further analyzed. The results show that gas velocity rapidly decreases to 8 m/s and gas species change significantly inside raceway, meanwhile the highest temperature of reducing gas reaches as high as 3742 K in front of tuyere under the production rate of 150 t/h. The increasing production rate from 150 t/h to 180 t/h reduces the highest temperature level by 20 K, and the increasing nitrogen mole concentration by 1% under the fixed oxygen flow rate reduces the highest temperature level by about 22 K, while the location of the highest temperature gas extends towards the interior of MG under the above conditions. Based on the above results, it can be concluded that in order to protect tuyere from thermal damage, the production rate and nitrogen concentration should be increased to shift the location of the highest temperature gas away from tuyere.
The raceway plays an important role in the mass and heat transportation inside the Corex melter gasifier (MG). Due to the fact that pure oxygen instead of air is injected into MG, it is of great importance to study the raceway phenomenon of MG and few works related to the subject have been reported before. Present work investigated gas velocity, species and temperature distribution behaviors in both raceway and coke bed regions by introducing a two-dimensional mathematical model at steady state. The influences of production rate and gas composition on above behaviors were further analyzed. The results show that gas velocity rapidly decreases to 8 m/s and gas species change significantly inside raceway, meanwhile the highest temperature of reducing gas reaches as high as 3742 K in front of tuyere under the production rate of 150 t/h. The increasing production rate from 150 t/h to 180 t/h reduces the highest temperature level by 20 K, and the increasing nitrogen mole concentration by 1% under the fixed oxygen flow rate reduces the highest temperature level by about 22 K, while the location of the highest temperature gas extends towards the interior of MG under the above conditions. Based on the above results, it can be concluded that in order to protect tuyere from thermal damage, the production rate and nitrogen concentration should be increased to shift the location of the highest temperature gas away from tuyere.
Keywords
Corex; Melter gasifier; Mathematical model; Raceway.
Corex; Melter gasifier; Mathematical model; Raceway.
How to refer
Du, Kai-ping;
Wu, Sheng-li;
Xu, Jian;
Shen, Wei;
Kou., Ming-yin.
NUMERICAL SIMULATION OF TEMPERATURE
DISTRIBUTION AROUND RACEWAY ZONE IN COREX
MELTER GASIFIER
,
p. 382-391.
In: 42º Seminário de Redução de Minério de Ferro e Matérias-primas / 13º Seminário Brasileiro de Minério de Ferro / 6th International Congress on the Science and Technology of Ironmaking,
Rio de Jabeiro,
2012.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-22104
