Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 29, No. 1 (January 2016) 118-126    Article in Press

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  FLUID DYNAMICS IN A COPPER CONVERTER: AN INVESTIGATION ON MIXING PHENOMENA IN AN EXPERIMENTAL MODEL
 
G. A. Sheikhzadeh, R. Dehghani Yazdeli and M. Soozanian Kashani
 
( Received: April 16, 2014 – Accepted: December 24, 2015 )
 
 

Abstract    In this study, the mixing phenomena and fluid dynamics in a copper converter have been experimentally investigated using a physical model. The physical model is a 1:5 horizontal tank made of Plexiglas. The mixing phenomena have been characterized by experimentally measuring the mixing time using a tracer dispersion technique. Moreover, the effects of the air flow rate and lance submergence on the slopping in the model have been studied. The experiments have been carried out for the air flow rates of 10, 15, 17 and 20 lit/min with the lance submergences of 8.5, 9.5, 10.5 and 11.5 cm. The results show that the mixing time decreases with increasing both air flow rate and lance submergence. In addition, the slopping reduces as the lance submergence increases while the air flow rate decreases. Based on the results of the mixing time and the slopping, an optimum condition for air injection was obtained which not only ensures the sufficient mixing but also results in the less slopping in the model. Furthermore, the mixing times were evaluated in terms of the specific mixing power. A correlation was established for estimating the mixing time in the model with respect to the specific mixing power.

 

Keywords    Physical model, Experimental study, Copper converter, Mixing time, Slopping, Air injection.

 

چکیده    در اين تحقيق، پديده‌های اختلاطی و ديناميک سيال درون يک کنورتور ذوب مس، با استفاده از يک مدل فيزيکي، به صورت تجربی مطالعه شده است. مدل فيزيکي استفاده شده يک مخزن افقي در مقياس 1:5 از جنس پلکسی گلاس مي‌باشد. با اندازه­گيری تجربی زمان اختلاط توسط يک روش دنبال کننده پخشي، پديده‌های اختلاطی توصيف شده‌اند. علاوه براين، اثرات دبی هوا و عمق غوطه‌وری لنس بر پديده موجدار شدن سيال درون مدل بررسي شده‌اند. آزمايش­ها در شرايط دبی هوای 10، 15، 17 و 20 ليتر بر دقيقه و عمق غوطه­وری لنس 5/8، 5/9، 5/10 و 5/11 سانتی‌متر انجام شده است. نتايج نشان می‌دهد که با افزايش دبی هوا و همچنين عمق غوطه‌وری لنس، زمان اختلاط کاهش می­يابد. همچنين با افزايش عمق غوطه­وری لنس و کاهش دبی هوا، پديده موجدار شدن سيال تقليل پيدا مي‌کند. با توجه به نتايج زمان اختلاط و موجدار شدن سيال، يک حالت بهينه برای تزريق هوا پيشنهاد شد که نه تنها اختلاط کافی را تضمين مي‌کند، بلکه موجدار شدن کمتر سيال درون مدل را ناشي مي‌شود. علاوه براين، نتايج مربوط به زمان اختلاط بر حسب توان مخصوص اختلاط ارزيابی شدند. يک رابطه برای تخمين زمان اختلاط درون مدل بر حسب توان مخصوص اختلاط ارائه شد.

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