Wet vapor level suction dehumidifier for steam turbine

Abstract

The present invention relates to field of steam turbine, discloses a wet steam turbine pump dehumidification device, which comprises a wet steam stage stationary blade of turbine and a last stage discharge volume, the intrados and back arc surface of the stationary blade have a pump gap, the last stage discharge volume and the lumen of stationary blade are communicated by a honeycomb duct, when the steam turbine starts to work, the pump gap inlet and the last stage discharge volume produce positive pressure differential, fluid in intrados and back arc surface of stationary blade enter last discharge volume through the pump gap, the stationary blade lumen and the honeycomb duct. The device can eliminate mostly water damaged for guided vane in wet steam stage of turbine, reduce or eliminate water erosion of guided vane, prolong service life of turbine and enhance safety operation capability.

Description

technical field [0001] The invention relates to the field of steam turbines, in particular to a steam turbine wet steam stage suction and dehumidification device. Background technique [0002] The last stages of high-power steam turbines and most stages of nuclear power steam turbines work in the state of wet steam. Wet steam not only reduces the aerodynamic efficiency of their wet steam stages, but also causes the corresponding moving blades to be continuously impacted by high-speed liquid droplets, resulting in Corrosion and even fracture of moving blades. The existing wet steam dehumidification technology is to set up a dehumidification tank on the cylinder near the air inlet of the wet steam stage vane. The structure and manufacturing process of this dehumidification tank are simple, but the dehumidification effect is relatively poor, especially in the back of the steam turbine. In the case of low pressure, the vapor humidity is relatively high, and the dehumidification...

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Problems solved by technology

[0002] The last stages of high-power steam turbines and most stages of nuclear power steam turbines work in the state of wet steam. Wet steam not only reduces the aerodynamic efficiency of their wet steam stages, but also causes the corresponding moving blades to be continuously impacted by high-speed liquid droplets, resulting in Corrosion and even fracture of moving blades

The existing wet steam dehumidification technology is to set up a dehumidification tank on the cylinder near the air inlet of the wet steam stage vane. This dehumidification tank has a simple structure and manufacturing process, but the dehumidification effect is relatively poor, especially in the back of the steam turbine. In the case of low pressure, the steam humidity is relatively high, and the dehumidification effect is relatively poor

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