赤泥分离沉降槽进料管结构的数值模拟和优化  

Numerical simulation and optimization on the feed pipe structure of the red mud thickener

作　　者：李茂[1,2] 雷波[1,2] 周天[1,2] 李秋龙[1,2] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083 [2]中南大学流程工业节能湖南省重点实验室,湖南长沙410083

出　　处：《轻金属》2013年第6期9-14,23,共7页Light Metals

基　　金：国家高技术研究发展计划"863"资助项目(2010AA065201)

摘　　要：为了进一步提高赤泥沉降槽固液分离效率,以仿真软件FLUENT为平台,应用创新设计的射流管对沉降槽进料管进行数值模拟与优化研究,并进行工业试验,以研究其工业应用并验证数值模拟结果。改进前后的数值计算结果表明:在进料固含为110g/L时,料浆通过射流管进入沉降槽中心筒时固含可稀释到45.09g/L,比普通沉降槽稀释幅度提高了31.92%;料浆进入中心筒的速度较改造之前同比降低10.2%,筒内料浆运行速度分布更为均匀合理,而离开中心筒的速度大致不变。改造后的工业试验表明,连续运行的沉降槽每吨干赤泥絮凝剂的使用量比传统沉降槽降低了17.8%。经对比分析,数值模拟结果与工业试验结果相符。采用具有新型进料管的沉降槽后,合作企业生产现场可停止使用200kW分离沉降槽和75kW共备槽的稀释循环泵各一台,其工业应用节能效果显著,为企业带来了可观的经济效益。In order to improve the solid -liquid separation e^ciency in the red mud thickener, software FLUENT was employed to conduct the numerical simulation and optimization research on the innovative design of the jet pipe in the thickener. With the jet pipe structure being applied in the industrial practice, the simulated effect was proved through the comparison of the operating parameter before and after the modification. It had been shown in the nu- merical simulation as below：When the solid concentration of the feed was 110g/L,the concentration would be diluted to 45.09g/L in the feed -well of the modification thickener, which was 31.92% lower than that of the common thickener; With the leaving speed almost the same, the speed of the slurry ente- ring into the feed - well was reduced 10. 2% than before and its distribution was more even and reasonable. And it had been shown in the field test that the flocculants dosage of the modification thickener was 17.8% reduced. It was indicated that the result of the industrial application complied with that of the numerical simulation. With the new jet pipe structure installed in the thickener,the power of a 200kW and a 75kW circulating pumps of the thickener were saved. It has brought great economical benefits to the factory.

关 键 词：沉降槽 射流管结构 固液两相流 中心筒固含 数值模拟 工业试验 

分 类 号：TF821[冶金工程—有色金属冶金]