In 2002, the East Route of the South-to-North Water Diversion Project was officially launched, and it is planned to transfer 14.8 billion cubic meters of water per year after completion. According to the overall plan, the final water diversion scale of the South-to-North Water Diversion Project is 44.8 billion cubic meters, including 14.8 billion cubic meters on the east line, 13 billion cubic meters on the middle line, and 17 billion cubic meters on the west line. The construction time will take about 40 to 50 years. After the project is completed, It will form the largest pumping station group in the world.
The South-to-North Water Diversion Project diverts water from the south to the north. It transfers water from low altitudes to high altitudes. To overcome the influence of gravity, it is necessary to use something like a water pump. In order to achieve a water transfer volume of tens of billions of cubic meters, it takes How many pumps does it take?
The South-to-North Water Diversion Project is divided into three lines, the east and the west. The east line project is drawn from the lower reaches of the Yangtze River and transported through the Beijing-Hangzhou Grand Canal. The total number of water pumping stations in this line has reached 51: the first phase of the project in 2014. There are 21 stations, 13 more will be built in the second phase, and 17 more will be built in the third phase
How big are these pumps?
It is reported that the smallest water pump is about one meter high, while the largest water pump is 5.2 meters high, and the pumping volume has reached 13,000 cubic meters, which is very spectacular, which also means that the related technical work is very difficult.
For the middle line project, the starting point of the middle line is Danjiangkou Reservoir, which is about 100 meters higher than Beijing, and the water can flow by itself by gravity.
The most difficult of the three lines is the west line project, which is to irrigate the arid areas in the west and northwest by diverting water from the Dadu River. The conditions in the western region are relatively harsh, and it is very difficult to work. Fortunately, the altitude of the western front is relatively high, so it is relatively easy to pump water, but it is more difficult to lay the water.
Pump selection is the most important and main task in the “feasibility study stage” of pumping station design. Whether the water pump selection is reasonable or not is related to the overall operating head, especially the economical operation under the design head condition, related to the safety and reliability of the entire operating head, and also related to installation, maintenance, and project investment.
The selection of water pumps includes the consideration of structural construction, but the focus is on the comparison and selection of hydraulic characteristics. From the mathematical relationship, grasp the characteristics of the pump and pump device efficiency, critical NPSH, etc., and select the most reasonable pump among the existing pump types, which is conducive to maximizing investment benefits. For pumping stations, flow channels and pump devices are also very important. The pump device is an extension of the water pump, and it is a “generalized water pump”. It is necessary to grasp the characteristics of the flow channel and the pump device from the mathematical relationship, and make a reasonable selection.
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Post time: Mar-08-2023