Steam turbine stator with serpentine channel and steam turbine stator heating and dehumidifying device

Abstract

The invention relates to a steam turbine stator with a serpentine channel and a steam turbine stator heating and dehumidifying device. The steam turbine stator with the serpentine channel mainly comprises a hollow stator body. At least three partition walls are arranged in the hollow stator body and arranged at intervals in the forward direction and the backward direction along the stator top to the stator root inside the hollow stator body. The tail ends of the partition walls and the inner wall of the stator root or the inner wall of the stator top are arranged at intervals, and a ventilation port is reserved. The serpentine channel used for conduction of air currents is formed in the hollow stator body. The hollow stator body is provided with an air inlet and an air outlet. High temperature steam is guided in from the air inlet, passes strokes of the serpentine channel in sequence and then is guided out of the air outlet. The serpentine channel which is provided with fins used for increasing roughness of an internal air current passageway is designed in the stator to enhance heat exchange, and thus the optimal dehumidifying effect can be achieved by guiding in the least heat.

Description

technical field [0001] The present invention relates to a dehumidification device, in particular to a steam turbine stator blade with a serpentine passage and a heating and dehumidification device for the steam turbine stator blade, which are especially suitable for the final stage stator blade. Background technique [0002] With the vigorous development of nuclear power steam turbines and ship steam turbines, the phenomenon of wet steam in the last stage of low-pressure cylinders is becoming more and more serious. If no treatment is done, the primary water droplets and secondary water droplets formed by the wet steam will impact the final stage rotor blades, causing water erosion of the final stage rotor blades. Studies have shown that the damage caused by secondary water droplets is far greater than that of primary water droplets. If the steam turbine blade is subjected to the high-speed impact of water droplets for a long time, the blade body will be seriously damaged or...

AI Technical Summary

Problems solved by technology

[0007] First, this method will cause the purge gas to be mixed with the mainstream steam, which will have a direct impact on the originally designed flow; and after the high-temperature gas is mixed with the low-temperature steam in the final stage, if it is used in the final stage, it will directly affect Condenser back pressure, which reduces the overall efficiency of the turbine;

[0008] Second, there is only one cavity in the vane, this method makes the flow of the introduced high-temperature gas in the cavity not violent, and the heat transfer effect is limited

Therefore, a large amount of high-temperature gas will be introduced into the blade, thereby wasting a part of high-temperature steam

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