Super-supercritical air cooling steam turbine

Abstract

The super-supercritical air-cooled steam turbine suitable for use in thermal power plant in unwatered area consists of super-supercritical wet cooled steam turbine high pressure cylinder, super-supercritical wet cooled steam turbine medium pressure cylinder and two low pressure cylinders. It features the two air cooled low pressure cylinders, the connection with low pressure cylinder bearing seat between the super-supercritical wet cooled steam turbine medium pressure cylinder and the air cooled low pressure cylinders and between the two air cooled low pressure cylinders, and the same structure of the high pressure cylinder and medium pressure cylinder in the super-supercritical air-cooled steam turbine and the high pressure cylinder and medium pressure cylinder in the super-supercritical wet cooled steam turbine. The two low pressure cylinders have improved structure and the present invention has air cooled exhaust. The present invention has low heat loss rate, high heat efficiency and low water consumption.

Description

technical field [0001] The invention relates to an ultra-supercritical air-cooled steam turbine, which is suitable for thermal power plants in water-shortage areas and belongs to the technical field of steam turbines for power generation equipment. Background technique [0002] Some countries in Asia and Africa, as well as my country's Northwest and North China, are coal-rich or oil-rich areas but water-short or arid, and the construction of thermal power plants faces the problem of water shortage. Global water resources are decreasing day by day, and industrial and domestic water consumption is increasing day by day. The problem of water resource security in my country is becoming more and more serious. The per capita water resources are equivalent to one-fourth of the world's per capita, and the geographical distribution is extremely uneven. In the coal-rich areas such as Shanxi, Shaanxi, Inner Mongolia, Xinjiang, and Gansu in northern my country , water resources are very...

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Problems solved by technology

[0006] 3. Usually, the bearing seat 12 of the low-pressure cylinder is inside the low-pressure cylinder, and the cylinder-type bearing seat is adopted. The center line of the shaft system will rise and fall with the change of the exhaust temperature of the low-pressure cylinder, which will cause the bearing load to be redistributed and affect the stability of the shaft system. ;

[0008] The low-pressure exhaust steam of the ultra-supercritical wet-cooled steam turbine is cooled by a circulating water system and a wet condenser. Its main disadvantage is that it consumes a lot of water and cannot be used in water-scarce areas.

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