China factory manufacture precision edm capabilities
In recent years, our country has shocked the world in the field of infrastructure construction. It has built the Three Gorges Dam, Hong Kong-Zhuhai-Macao Bridge, China Sky Eye and other projects that shocked the world. Let me talk about another world-class project in our country today: the South-to-North Water Diversion Project. China factory manufacture precision edm capabilities
The South-to-North Water Diversion Project is actually caused by the geography of our country. my country is a country with a vast land and rich resources, but there are also some other problems, that is, the uneven distribution of resources, which leads to relatively more water resources in the south of my country than in the north. a lot of.
In order to solve the problem of water shortage in the north, the South-to-North Water Diversion Project has been put on the agenda. As early as 1954, in order to solve the problem of water shortage in northern Jiangsu, Jiangsu Province began to contemplate the northward diversion project of “rooting the Yangtze River and diverting the river to the Huaihe River”. This is the predecessor of the South-to-North Water Diversion Project. China factory manufacture precision edm capabilities
After years of demonstrations by countless water conservancy experts, a very imaginative engineering plan was finally explored-“Let the Yangtze River water climb the stairs to northern Jiangsu”, that is, design 9 large pumping stations along the way, like stairs, to lift water step by step. In December 1961, the construction of Jiangdu First Station of Jiangdu Water Conservancy Project started. This was the largest large-scale pumping station in China at that time, and it was also the source of the current east line of the South-to-North Water Diversion Project.
In 2002, on the basis of the Jiangsu River-to-North Diversion Project, the East Route of the South-to-North Water Diversion Project was officially launched. After the completion of the plan, the average annual water transfer will be 14.8 billion cubic meters. 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.
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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 things like water pumps. In order to achieve a water transfer volume of tens of billions of cubic meters, it takes How many pumps does it take? China factory manufacture precision edm capabilities
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 construction 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. China factory manufacture precision edm capabilities
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 “water pump in a broad sense”. It is recommended to grasp the characteristics of the flow channel and pump device based on the mathematical relationship, make a reasonable selection, and strive to design and build a world-class pumping station project that will live up to the reputation of the South-to-North Water Diversion Project. China factory manufacture precision edm capabilities