复挡除沫器分离理论与实验研究

Theoretical and Experimental Research on Separa- tion Performance of Multi-Baffle Mist Eliminators

通过系统的理论分析,对文献模型进行修正,建立了复挡除沫器的新的分离效率关联式。用真空泵油在管道内喷雾,获得含雾气流,使气流以6.71～26.42m/s的流速通过一个直径500mm的三槽道复挡除沫器,首次进行了除沫性能的试验测定。结果表明,理论预测效率与实测效率具有良好的一致性,相对误差在3％以内;其准确性明显高于目前设计手册中的效率计算式,后者的预测值偏高。利用计算机对复挡除沫器的槽宽分布进行了优化设计。结果表明,采用优化的槽宽分布,分离效率最高,但与等槽宽情况相比,效率的提高不十分显著(<1％);按“内窄外宽”原则确定槽宽分布,不但不可能提高复挡效率,还会导致效率降低。介绍了复挡除沫器的设计程序。

A new expression is developed for collection efficiencies of multi-baffle mist eliminators on tbe basis of systematic theoretic analysis and revision of tbe models presented in literatures. The collection efficiencies were determined experimentally for the first_time by spraying vacuum oil in tube to obtain a mist-loading gas and passing it through a φ530mm two-baffle eliminator at 6.71-26.42m/s inlet velocities. The results showed that the predicted values agreed well with the measured values with a relative error of ≤3% and the prediction accuracy was increased obviously in comparison to the expression adopted in the current design manual which resulted in efficiency overestimatioa. The channel width distribution was optimized to reach higher collection efficiency. However, the efficiencies were only slightly higher than with even channel width distribution (increament <1%). When the caunel width was distributed in the way of narrower inner channel and wider outer, the collecion efficiencies decreased, instead of increased as former expectation. The design procedure of the eliminator was described.