| 泵站加压与重力自流联合供水工程的停泵水锤防护 |
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| 引用本文： | 丁梓恒,俞晓东,马世波,张喆鑫,张健.泵站加压与重力自流联合供水工程的停泵水锤防护[J].排灌机械工程学报,2022,40(4):338-344. |
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| 作者姓名： | 丁梓恒 俞晓东 马世波 张喆鑫 张健 |
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| 作者单位： | 1. 河海大学水利水电学院, 江苏 南京210098; 2. 辽宁省水利水电勘测设计研究院有限责任公司, 辽宁 沈阳 110006; 3. 河海大学农业科学与工程学院, 江苏 南京210098 |
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| 摘 要： | 针对某首部泵站加压与重力自流相结合的长距离、高落差输水工程,基于瞬变流计算中常用的特征线法建立了全系统水力过渡过程数学模型,模拟了系统停泵水锤全过程.为了解决水泵机组掉电后管道中出现的负压问题,提出了在泵后采用空气罐的防护方案,并对空气罐参数进行优化设计,确定了较优的空气罐体型;于管道最高点处设置高位水池,水池后的重力...
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| 关 键 词： | 长距离输水工程 停泵水锤 空气罐 关阀 特征线法 |
| 收稿时间： | 2021-04-29 |
Pump failure water hammer protection of pumping station pressurization and gravity combined water supply project |
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| DING Ziheng,YU Xiaodong,MA Shibo,ZHANG Zhexin,ZHANG Jian.Pump failure water hammer protection of pumping station pressurization and gravity combined water supply project[J].Journal of Drainage and Irrigation Machinery Engineering,2022,40(4):338-344. |
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| Authors: | DING Ziheng YU Xiaodong MA Shibo ZHANG Zhexin ZHANG Jian |
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| Institution: | 1. College of Water Resources and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Liaoning Water Conservancy and Hydropower Survey and Design Research Institute Co., Ltd., Shenyang, Liaoning 110006, China; 3. School of Agricultural Science and Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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| Abstract: | Aiming at the long-distance and high drop water conveyance project with the combination of pressurization and gravity gravity gravity flow in a head pump station, the mathematical model of the whole system hydraulic transition process is established based on the characteristic line method commonly used in transient flow calculation, and the whole process of pump shutdown water hammer is simulated. In order to solve the problem of negative pressure in the pipeline after power failure of water pump unit, the protection scheme of using air tank behind the pump is put forward, the parameters of air tank are optimized, and the better shape of air tank is determined; A high-level water tank is set at the highest point of the pipeline, and the gravity flow section behind the water tank adopts the mode of series connection of pressure reducing valve and regulating tank for energy dissipation. Under the condition of pump shutdown, in order to avoid empty leakage of the high-level water tank, it is necessary to close all pressure reducing valves. In order to prevent the booster water hammer generated by valve closing from exceeding the pipeline pressure bearing standard, resulting in pipe explosion accident, and considering the influence of water level fluctuation of each regulating tank, different valve closing schemes are selected for comparison. The calculation results show that the preferred volume of the air tank of the project is 15 m3, and the pressure reducing valve is closed in a straight line in 120 s after the pump is stopped. Since the regulating tank is set behind the pressure reducing valve, closing the valve successively and closing the valve at the same time has little impact on the results. The research conclusion provides a reference for the design and safe operation of similar water supply projects. |
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| Keywords: | long distance water conveyance project pump failure water hammer air tank valve closing characteristic line method |
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