摘要
强潮河口排涝泵站由于外江水位变动大,运行扬程范围宽,导致水泵选型困难。本文通过对规范规定的感潮河段泵站扬程取用规定和工程实际取用情况的对比分析,认为在强潮河口按规范规定的方式确定泵站特征扬程并据此选定水泵,运行时遇强潮需关机停泵,可能错过最佳排涝时机,加重城市内涝。对运行扬程范围较大的泵站,理论上采用变频调速技术可以很好地解决水泵对扬程变化的适应性。但由于高压变频设备价格昂贵,制约了变频调速技术在排涝泵站中的应用。提出在确定强潮河口排涝泵站特征扬程时应合理分析内外水位组合出现的概率,缩小泵站运行扬程范围,方便水泵的选型。如果还是无法解决,可通过设置两种不同扬程水泵组合及人为抬高出水池水位的方式来保证泵站的安全高效运行。
For the drainage pumping station located at macro-tidal estuary, the type-selection of the pump is difficuh due to the large fluctuation of the outer river water level and the wide area of its operation head. Through a comparative analysis made herein between the provision defined in the relevant criteria for the pumping head of the pumping station located at the tidal river reach and the adoption for the actual project, it is considered that if determining the characteristic head for a pumping station located at macro-tidal estuary and then selecting the pump on the basis of this, the pump must be shut down during the operation when encountering a strong fide, thus the best drainage opportunity is possibly to be missed, and the urban waterlogging is then to be aggravated as well. For the pumping station with a larger range of operation head, the problem of the adaptability of pump to the variation of the pumping head can be theoretically better solved with the variable-frequency speed-regulation technology. However, the application of the variable-frequency speed-regulation technology to drainage pumping station is restricted due to a higher price of the equipment. It is suggested that the probability of the occurrence of the combination of the inner and outer river water levels is to be reasonably analyzed when determining the characteristic head of the drainage pumping station located at the macrotidal estuary, so as to reduce the range of the operation head of the pumping station and is convenient to select the type of pump. If it can not be solved yet, the methods of setting two different head pump combinations or artificially raising the water level of the outlet sump of pumping station can be adopted to ensure the safe and efficient operation of pumping station.
出处
《水利水电技术》
CSCD
北大核心
2016年第9期70-74,共5页
Water Resources and Hydropower Engineering
关键词
强潮河口
外江
泵站
最高运行水位
特征扬程
运行范围
macro-tidal estuary
outer river
pumping station
maximum operation water level
characteristic head
operation range
