铁浴式熔融还原炉浸入式侧吹对熔池内流动影响的数值分析

Mathematical Simulation on Flow Behavior of Immersion Side-blowing in Iron-bath Smelting Reduction Furnace

运用CFD软件Fluent6.3对熔融还原终还原炉内的流动状态进行了三维数值模拟.采用VOF多相流模型以及标准k-ε湍流模型模拟炉内气、渣、铁水三相流的流动,研究了不同侧枪枪位、插入深度和角度对于炉内流动的影响.计算结果表明,侧枪枪位较低时,渣液和铁液的含气量较高,对熔池的搅拌越剧烈;侧枪插入深度较深时,对熔池的搅拌更强烈,顶部喷溅更加剧烈,当侧枪插入深度较浅时,壁面所受应力增大,对壁面侵蚀加剧;侧枪角度为30o和50o时,顶部空间的溅渣量增多,渣层的搅拌比较剧烈,侧枪角度为30o时,气体和渣液对炉衬的侵蚀相对较小.

The CFD software Fluent 6.3 was used to simulate the flow behavior in an iron-bath smelting reduction furnace with the side-blown immersion technique. The VOF and standard turbulence models were applied to simulate three-phase flow of the gas,slag and molten iron bath. The effects of location,submerged depth and angle of side nozzles on the flow field in the furnace were studied. The results show that when the location of side nozzles is lower,the gas contents in the slag and liquid iron are higher,and the stirring of bath is more violent. When the submerged depth of side nozzle increases,the stirring of bath is more violent and more slag splashed to the top space. When the submerged depth of side nozzle decreases,the outlet of nozzle is closer to the furnace wall and the stress near the wall increase. When the angles of side nozzle are 30° and 50°,the slag droplets in the top space increase,the stirring of slag is more intense. When the nozzle angle is 30°,the furnace wall is less eroded.