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Moisture removal device for steam turbine

A moisture and steam technology, applied in stators, engine components, machines/engines, etc., can solve the problems of decreased moisture removal efficiency and inability to remove water film flow, etc., and achieve the effects of improving moisture removal efficiency, inhibiting corrosion, and realizing life

Active Publication Date: 2018-03-06
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the inlet opening a is close to the leading edge side of the stator blade, the water film flow sw formed on the trailing edge side of the stator blade relative to the inlet opening a cannot be removed, and there is a problem that the water removal efficiency decreases.

Method used

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  • Moisture removal device for steam turbine
  • Moisture removal device for steam turbine
  • Moisture removal device for steam turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0057] Next, pass Figure 1 ~ Figure 4 A water removal device according to a first embodiment of the present invention will be described. exist figure 1 Among them, the stator blade 12 is provided in the wet steam flow path of the steam turbine. The hub portion of the stator blade 12 is connected to the diaphragm 14 , and the tip portion is connected to the support ring 16 .

[0058] exist figure 2 in, with Figure 15 In the illustrated stator blade 100 similarly, the stator blade leading edge fe is arranged on the upstream side in the flow direction of the wet steam flow s with respect to the wet steam flow s, and the stator blade trailing edge re is arranged on the downstream side. Furthermore, the stator blade belly surface fs is arranged obliquely with respect to the wet steam flow s so as to face the wet steam flow s. Moisture contained in the humid steam flow s becomes water droplets and adheres to the ventral surface fs of the stator blade and the back surface of...

Embodiment approach 2

[0073] Next, based on Figure 6 A second embodiment of the present invention will be described. The location and orientation of the slit hole 30 in this embodiment with respect to the abdomen surface fs of the stator blade are the same as those of the slit hole 22 in the first embodiment. The stator blade trailing edge side wall surface 30a and the stator blade leading edge side wall surface 30b of the slit hole 30 have linear cross-sectional shapes, and the inclination angle A of the stator blade trailing edge side wall surface 30a relative to the leading edge side reference plane of the stator blade web surface fs, and the inclination angle B of the leading edge side wall surface 30b of the stator blade relative to the leading edge side reference plane of the stator blade ventral surface fs, the former forms an acute angle and the latter forms an obtuse angle (0°

[0074] That is, the cross section of the slit hole 30 is formed bilaterally sy...

Embodiment approach 3

[0077] Next, based on Figure 7 , the third embodiment of the present invention will be described. The arrangement position and direction of the slit hole 40 in this embodiment are the same as those of the slit hole 22 in the first embodiment. Compared with the slit hole 22 of the first embodiment, the cross-sectional shape of the slit hole 40 is a shape in which the inlet side region 40 b of the leading edge side wall surface of the stator blade is notched.

[0078] That is, the inclination angle A of the trailing edge side wall surface 40a of the stator blade with respect to the leading edge side reference plane of the stator blade belly surface fs is set as an acute angle (0°

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PUM

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Abstract

The object of the present invention is to improve the removal efficiency of the water film flow formed on the ventral surface of the stationary blade through simple processing of the stationary blade, suppress corrosion of the moving blade, form a hollow portion (12a) inside the stationary blade (12), The ventral surface (fs) of the stator vane of the steam flow (s) has an inlet opening (a), and a slit hole (22) communicating with the hollow portion (12a) is formed along the axial direction of the stator vane (12). The hollow portion (12a) communicates with a region of lower pressure than the flow portion of the moist vapor stream (s). The hollow part (12a) is depressurized, and the water film flow (sw) formed by the water droplets (dw) adhering to the ventral surface (fs) of the stator blade (fs) is sucked into the slit hole (22). The slit hole (22) is formed at the downstream end of the hollow part (12a) in the flow direction of the wet steam flow (s), and the side wall surface (22a) of the stator blade trailing edge of the slit hole (22) is arranged so as to be opposite to the ventral surface of the stator blade ( Since the reference plane on the leading edge side of fs) is formed at an acute angle, the inlet opening (a) can be arranged on the trailing edge (re) side of the stator blade.

Description

technical field [0001] The present invention relates to a moisture removal device capable of efficiently removing water droplets or water films adhering to the ventral surfaces of stator blades of a steam turbine. Background technique [0002] In the vicinity of the final stage of the steam turbine, the humidity of the steam flow becomes 8% or more. Turbine efficiency drops due to loss of humidity due to water droplets generated from this humidified vapor stream. Then, the water droplets generated from the moist steam collide with the rotating blades rotating at high speed to cause an erosion phenomenon. Water droplets contained in the wet steam flow adhere to the surface of the stator vane to form a water film. The water film becomes a water film flow on the surface of the stator vane, flows toward the trailing edge side of the stator vane, and then is torn apart at the trailing edge of the stator vane to form coarse water droplets. The coarse water droplets are one of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D9/02F01D25/32
CPCF01D25/32F01D9/041F05D2220/31F05D2240/123F05D2250/182F05D2250/294F05D2250/312F05D2250/314
Inventor 高田亮田畑创一朗
Owner MITSUBISHI HITACHIPOWER SYST LTD
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