Influence rule of downtime on heat transfer in converters
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The models for calculating the heat transfer in converters allow the accurate control of heat dissipation caused by downtime, and thus help increase scrap ratio and reduce energy consumption. ANSYS 17 was used to establish such a model to analyse the coupling law between the downtime and heat dissipation of the converter and the temperature drop of molten iron. Temperature was measured by infrared detection, and model accuracy was verified by comparative analysis. The variation law of the amount of cold charge added for different downtimes under different process conditions was studied. The results show that the range of the variation of heat dissipation caused by downtime is 8.9–78.5 GJ. If the downtime increases by 30 min, heat dissipation of dephosphorisation (deP) and decarburisation (deC) converters increases by about 23.4 and 41.3 GJ, respectively. In a certain smelting cycle, the temperature drop of the molten iron for deP, deC and conventional converters increases by about 12.5, 15.0 and 17.0 K, respectively; and the amount of scrap added in the double-linking and conventional smelting processes decreases by 0.93 and 0.75%, respectively.
KeywordsDowntime Converter heat dissipation Scrap ratio Temperature field Finite element
The authors are grateful for the financial support of the National Natural Science Foundation of China (Grant Nos. 51674030 and 51574032) and the National Key Research and Development Program of China (Grant No. 2016YFB0601301).
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