文献类型：期刊文献

英文题名：Optimization of shaft-seal water system of cutter suction dredger based on high-efficiency centrifugal separation technology

作者：Bai, Zhishan[1];Hu, Xiaoxue[1];Wang, Bingjie[1];Hu, Ziqiang[1];Yang, Xigang[2,3];Zhao, Tianbiao[4,5]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]China Commun Construct Co Ltd, Shanghai 201208, Peoples R China;[3]Natl Engn Res Ctr Dredging Technol & Equipment Co, Industrializat Dept, Shanghai 201208, Peoples R China;[4]Minist Transport, Key Lab Waterway Dredging Technol, Shanghai 200120, Peoples R China;[5]Shanghai Waterway Engn Design & Consulting Co Ltd, Shanghai 200120, Peoples R China

年份：2020

卷号：236

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20194807739092);WOS:【SCI-EXPANDED(收录号:WOS:000509819400042)】；

基金：This work is supported by National Key Research and Development Program of China (2016YFCO204500), National Natural Science Foundation of China (51578239, 21878099, 51608203) and the Scientific Research Projects of Shanghai, China (17DZ1202802).

语种：英文

外文关键词：Shaft-seal water system; Centrifugal sand separation; Water-sealed hydrocyclone; Wear analysis; Service life evaluation

摘要：The shaft-seal water system (SSWS), as one of the critical systems for slurry pump protection, is widely used to provide shaft-seal water in cutter suction dredger. In general, the shaft-seal water obtained from gravity clarifier always accompanies with numerous sand with large size (> 10 mu m), resulting in the inevitable intense wear of components in the slurry pump, especially, the shaft sleeve and L-shaped rubber ring in back shaft seal. Even worse, the high temperature caused by unstable shaft rotation in the present of sand will aggravate the degree of this wear. To address the above thorny problems, in this study, water-sealed hydrocyclone (WSH) was un-precedentedly applied to optimize SSWS for high-efficiency sand centrifugal separation. The dimension and structure of WSH were designed and optimized before final industrial application. High-efficiency separation zone (the separation efficiency > 90%) with Re ranged of 1.88 x 10(4)-2.23 x 10(4) was also confirmed by introducing the optimal structure of the WSH (5 degrees of cone angle and 10 mm of bottom apex diameter). For the improved SSWS in the actual application, the D-v(50) of the shaft-seal water decreased from 38.0 mu m to 9.1 mu m, and the corresponding solid concentration declined from 0.51 g/L to 0.051 g/L. Furthermore, it was verified that the optimized SSWS could significantly reduce the wear of the shaft sleeve and L-shaped rubber ring, and extend the service life of L-shaped rubber ring, up to 4 months. This finding provided a new insight for the optimization of the SSWS for slurry pump, which could improve the operational stability and reliability of cutter suction dredger in the construction of marine infrastructure.