新型氧化铝打壳下料装置内部流场仿真与结构设计

Interior Flow Field Simulation and Structural Design of Crust Breaking and Feeding Device for New Alumina

本文针对铝电解槽打壳下料装置建立流场模型,模拟新型氧化铝进、出定容下料器的流动状态,并基于模拟结果进行下料装置结构设计,并辅以冷、热态试验进行验证。试验表明该下料器进料时间为6 s,下料器动作稳定,连贯性和一致性良好,定容准确,下料精度达到98.36%以上,同时将现行铝电解槽采用的两套相对独立的打壳和下料系统简化为一套系统,解决新型氧化铝细粉多、易飞扬等难题,节约设备维护成本。

A flow field model was developed for the crust breaking and feeding device of aluminum electrolysis cell to simulate the flow regime of the new alumina into and out of the constant feeder. The structure of the device was designed based on simulation results and verified under cold-state and hot-state tests. Results show that at a feeding time of 6 s, the feeder’s action is stable, smooth and consistent with a constant discharge accuracy higher than 98.36%. It also integrates the relatively independent crust breaking system and feeding system into one single simplified system of crust breaking and feeding, saving costs on equipment maintenance. This offers a solution to the challenges of new alumina fines, which is likely to generate fugitive dust.