Technical water supply system of large unit

Abstract

The invention relates to a technical water supply system of a large unit, and is applicable to the field of water conservancy and hydropower engineering. The purpose of is to provide the technical water supply system of the large unit to ensure the reliability and safety and the operational flexibility of the large unit and generating equipment of the large units. According to the technical scheme, the technical water supply system of the large unit is characterized in that corresponding units and main transformers are separately provided with unit water supply systems and main transformer water supply systems; the unit water supply systems of the adjacent units communicate by unit contact water supply main pipes, and the unit contact water supply main pipes communicate with unit electricvalves; and the main transformer water supply system of the adjacent main transformers communicate by main transformer contact water supply main pipes, and the main transformer contact water supply main pipes communicate with main transformer electric valves.

Description

technical field [0001] The invention relates to a technical water supply system of a large unit. Applicable to the field of water conservancy and hydropower engineering. Background technique [0002] With the improvement of China's water conservancy and hydropower engineering technology, my country's technology in hydroelectric generating units has been greatly improved, and it is possible to design and manufacture hydroelectric generating units with greater single-unit power. The capacity of the recently designed hydroelectric generating units has reached 1000MW, ranking The world's first hydropower. While the technology and capacity of the unit are improving, the design of the water supply system for cooling and lubricating the unit and its transmission transformer (such as the main transformer) is also faced with the problem of how to design. There are: [0003] 1. In previous projects, a single water pump was used to supply water to the unit and the main transformer at...

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Problems solved by technology

The technical water supply pumps between adjacent units can serve as backup water sources for each other. Due to the different water supply paths and pipe diameters, it is difficult to match the pump parameters. The stable operation and safety of the water pump has brought great hidden dangers

[0005] 3. The water supply volume of the large-capacity unit is relatively large, and the selected technical water supply pipes have a large diameter and a large number; generally, we set the technical water supply inlet and outlet on the side wall of the tailwater tunnel, so that it must be located at the location of the water inlet. Excavation on the side wall of the tailrace tunnel

As the section size of the tailrace tunnel is already relatively large, for the tailrace tunnel with poor geological conditions, other caverns are arranged at the same time, and further excavation will be carried out on this basis, which will be very unfavorable to the stability of the cavern itself

[0006] 4. At present, the dredging and purging of the large-diameter water intake on the water supply pipeline of large-scale units all choose to set up the compressed air purge interface on the open pipe section of the technical water supply pipeline, because the purge air source is far away from the water intake of the technical water supply system , and the diameter of the compressed air purge pipe is small, generally a few tenths of that of the technical water supply pipeline, and the ratio of the diameter of the compressed air purge pipe to the trash rack is even smaller. When the water intake trash rack is not completely blocked, When the compressed air used for purging is sent to the trash rack of the water intake through the technical water supply pipeline, the pressure of the compressed air drops a lot, and it cannot clean up the debris on the trash rack of the water intake

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