大型泵站噪声与治理

虽然《泵站设计规范》对泵站电动机层的噪声作了明确的规定,但实际上泵站机组运行产生的噪声多数超出了规范的要求.针对南水北调东线泵站工程年运行时间长,如何减小设备运行的噪声,减小其对运行人员的不利影响的问题,在分析噪声源的基础上,进行分析研究,以采取有效的减噪措施.首先根据水泵机组噪声产生的原理,针对噪声特点,在设备设计和制造方面采取优化电磁回路设计、选用优质材料、提高加工工艺标准等措施,从源头减小噪声;其次,结合设备结构和布置的特点,对主要噪声源--电动机和叶轮外壳采取阻尼隔音毡的措施,减小噪声的发射;最后在设备布置的空间内设置吸音材料,构建吸音空间等措施.多种减噪措施的组合,使泵站运行时电动机层的噪声小于85 dB,优于国家有关噪声的规范要求,改善了运行管理人员的工作环境.

Pump station noise and governance

Although pumping station noise is clearly defined in Pumping Station Design Standard, in most cases the noise exceeds the standard. In South to North Water Diversion Project, long pumping time makes the issue more serious. Effective methods were discussed and adopted on the basis of noise sources analysis. Firstly, the noise occurrence principle was analyzed, and according to the noise characteristics, optimizing electromagnetic circuit, selecting superior material, improving processing standards and so on were made in the aspects of design and manufacture to reduce noise from the basic level. Secondly, considering the units′ structure and arrangement, damping insulation blankets were used on the motor and runner shells to weaken the noise spread. Finally, sound-absorbing material and building acoustic space was applied at the station. As the prevention methods used together, the motor floor noise of pumping station is less than 85 dB, which is better than the nation′s specification and good for working environment.