Steam turbine and dehumidifying device in steam cylinder of steam turbine

Abstract

The invention discloses a dehumidifying device in a steam cylinder. The dehumidifying device is used for reducing the humidity of high-pressure steam in a steam turbine. A hot steam source comprises a hot steam source body, a heat exchanger and a water collecting device, and the heat exchanger and the water collecting device are arranged between two adjacent stages in the steam cylinder of the steam turbine; the heat exchanger comprises a heat exchange pipeline communicated with the hot steam source body, and the heat exchange pipeline is provided with a drain port and a steam exhaust port; and a liquid inlet of the water collecting device is communicated with the drain port, and the water collecting device is provided with a water outlet. The dehumidifying device in the steam cylinder can effectively reduce the humidity of the high-pressure steam, so that the high-pressure steam is prevented from causing water corrosion for blades, particularly last-stage blades, of the steam turbine. The invention further discloses the steam turbine with the dehumidifying device in the steam cylinder.

Description

technical field [0001] The present invention relates to the technical field of steam turbines, more specifically, to an in-cylinder dehumidification device, and also to a steam turbine with the above-mentioned in-cylinder dehumidification device. Background technique [0002] A steam turbine is a rotary power machine that converts the energy of steam into mechanical work. It is mainly used as a prime mover for power generation, and can also directly drive various pumps, fans, compressors and ship propellers. [0003] During the working process of the steam turbine, after the high-pressure saturated steam enters the cylinder of the steam turbine and expands to do work, the humidity of the exhaust steam increases, which can easily cause water erosion on the blades of the steam turbine, especially the last stage blades, and then affect the operation safety of the steam turbine. To discharge the steam with increased humidity, the exhaust pressure must be increased, so that the e...

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Problems solved by technology

[0003] During the working process of the steam turbine, after the high-pressure saturated steam enters the cylinder of the steam turbine and expands to do work, the humidity of the exhaust steam increases, which can easily cause water erosion on the blades of the steam turbine, especially the last stage blades, and then affect the operation safety of the steam turbine. To discharge the steam with increased humidity, the exhaust pressure must be increased, so that the effective enthalpy drop of the steam doing work in the steam turbine is reduced, and the power generation is reduced

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