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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Interaction of dust with the DC plasma arc - a computational modelling investigation
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Interaction of dust with the DC plasma arc - a computational modelling investigation

机译：灰尘与直流等离子弧的相互作用-计算模型研究

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摘要

The presence of dust and fume suspended in the freeboard region is a common feature of the operation of direct current (DC) plasma smelting furnaces. This occurs primarily as a result of the use of fine feed materials together with the open-arc, open-bath operation of such smelters, and is exacerbated by the high velocities and turbulent mixing of the gas hi the vicinity of the arc jet. Dust and fume losses into the furnace off-gas system can be significant in some cases and may have economic, operational, and environmental impacts on the process. A computational modelling study is presented in which the concentration of dust material was considered as a continuous field subject to a governing partial differential equation. Settling behaviour was calculated as a function of particle size, local gas/plasma temperature, and other physical properties. Development of the coupling between the concentration field and a magnetohydrodynamic description of the arc is shown, and the resulting models were used to compute various aspects of the behaviour of the concentration field in the arc region for a variety of furnace conditions. Time-averaged as well as transient models of the arc were used to generate the results presented. Qualitative case studies produced several practical suggestions for furnace operation, including increased dust capture by the bath when feed ports are located closer to the electrode, and the possible effects of feed segregation in the furnace freeboard based on dust particle size and density.
机译：悬浮在干舷区域的灰尘和烟尘的存在是直流（DC）等离子熔炼炉运行的共同特征。这主要是由于使用了精细的进料以及此类冶炼厂的开弧，开槽操作而导致的，并且由于气体的高速流动和湍流混合，在电弧射流附近加剧了这种情况。在某些情况下，进入炉子废气系统的粉尘和烟尘损失可能非常大，并且可能对该工艺产生经济，运营和环境影响。提出了一个计算模型研究，其中粉尘材料的浓度被认为是服从偏微分方程的连续场。根据颗粒大小，局部气体/等离子温度和其他物理特性计算沉降行为。示出了浓度场和电弧的磁流体动力学描述之间的耦合的发展，并且所得到的模型用于针对各种炉条件在电弧区域中计算浓度场的行为的各个方面。电弧的时间平均模型和瞬态模型用于生成给出的结果。定性的案例研究为炉子的运行提出了一些实用的建议，包括当进料口更靠近电极时，熔池会增加粉尘的捕集量，以及进料偏析基于粉尘颗粒大小和密度在炉内干线上的可能影响。

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