High-pressure cylinder of ultra-supercritical steam turbine set

Abstract

The invention discloses a high-pressure cylinder of an ultra-supercritical steam turbine set. The high-pressure cylinder of the ultra-supercritical steam turbine set comprises an outer cylinder and an inner cylinder, wherein the inner cylinder is arranged inside the outer cylinder; the inner cylinder is internally provided with an intake air chamber; the intake air chamber is internally provided with clapboards at multiple levels and a first steam seal; the clapboard at each level is used for bearing a pressure difference and a temperature difference of the steam; the first steam seal is used for sealing a gap between the intake air chamber and a rotor; the intake air chamber is provided with an intake air pipe in a connecting manner; the intake air pipe penetrates through the inner cylinder and the outer cylinder to extend outwards; the intake air pipe is used for bringing steam into the intake air chamber; the steam after acting in the intake air chamber enters into the inner cylinder to act; a part of the steam penetrates through the inner cylinder to flow into the outer cylinder, so that gradient pressure difference as well as temperature difference is formed in the intake air chamber, the inner cylinder and the outer cylinder. As a nozzle chamber is replaced by the intake air chamber, and a third cylinder is formed in the inner cylinder of the high-pressure cylinder, the high-pressure cylinder of the ultra-supercritical steam turbine set not only can improve the efficiency of the steam turbine set through the intake air chamber without greatly improving the manufacturing cost of the high-pressure cylinder, but also can prevent steam flow shock excitation danger caused by uneven pressure of the steam, obtains high safety, and is reliable and practical.

Description

technical field [0001] The invention relates to a steam turbine unit, in particular to a high-pressure cylinder of an ultra-supercritical steam turbine unit. Background technique [0002] The steam turbine units of thermal power plants are divided into subcritical steam turbine units, supercritical steam turbine units and ultra-supercritical steam turbine units according to the temperature of the main steam, and the steam of the ultra-supercritical steam turbine units is not lower than 600°C. Ultra-supercritical steam turbines have significant energy-saving and environmental-improving effects, and will play an important role in future thermal power construction. [0003] At present, the steam pressure of the ultra-supercritical steam turbine is usually about 26MPa, and the temperature is 600°C. In order to withstand this steam pressure and temperature, the high-pressure cylinder of the ultra-supercritical steam turbine must adopt a double-layer cylinder structure. see figu...

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Problems solved by technology

However, due to the structure of the aforementioned nozzle chamber 03, the steam turbine unit forms uneven steam intake during operation, which not only affects the efficiency of the steam turbine unit, but also produces uneven steam pressure, which in turn leads to steam flow excitation in the turbine unit In addition, the steam pressure and temperature of the nozzle chamber 03 are limited. If the efficiency of the steam turbine unit is improved by increasing the steam parameters, it is necessary to increase the thickness of the inner and outer cylinders of the high-pressure cylinder and improve the manufacturing of the inner and outer cylinders. Material grades, such as the use of nickel-based alloys, etc., will directly and greatly increase the manufacturing cost of high-pressure cylinders, which is extremely impractical

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