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Moisture removal device for steam turbine and method for forming slit hole

A moisture and turbine technology, applied in the direction of stator, engine element, machine/engine, etc., can solve the problem of increased braking loss of blade 102, and achieve the effect of improving moisture removal efficiency, suppressing the decline of turbine efficiency, and simple processing

Active Publication Date: 2017-06-06
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the braking loss of the rotor blade 102 increases due to the collision of the coarse water droplets cw

Method used

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  • Moisture removal device for steam turbine and method for forming slit hole
  • Moisture removal device for steam turbine and method for forming slit hole
  • Moisture removal device for steam turbine and method for forming slit hole

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0057] Next, pass Figure 1 to Figure 5 , the water removal device according to the 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 . The orientation of the vane surface of the stator vane 12 relative to the wet steam flow s Figure 17 The stator blades 100 shown are identical.

[0058] That is, if figure 2 As shown, with respect to the wet steam flow s, the leading edge fe of the stator blade is arranged on the upstream side, the trailing edge re of the stator blade is arranged on the downstream side, and the ventral surface fs of the stator blade is inclined relative to the wet steam flow s so as to face the wet steam flow s configuration. Moisture such as water droplets contained in the humid steam flow s becomes water ...

Embodiment approach 2

[0076] Next, based on Figure 8 , to describe the second embodiment of the present invention. The shape of the slit hole 40 of the present embodiment is the same as that of the first embodiment, but the cross-sectional shape of the through hole 42 is different from the through hole 26 of the first embodiment. That is, the through hole 42 is cylindrical and has the same diameter in the axial direction, but the axis 42a is inclined such that the inlet opening c is closer to the leading edge side of the stator blade than the outlet opening d. That is, the inclination angle A of the axis line 42a with respect to the leading edge side reference plane of the stator blade belly surface fs is 90°

[0077] The method of formi...

Embodiment approach 3

[0080] Next, based on Figure 9 A third embodiment of the present invention will be described. The concave portion 24 of the slit hole 50 of the present embodiment has the same shape as the concave portion 24 of the second embodiment, and the through hole 52 is cylindrical, and the point having the same diameter in the axial direction passes through the hole of the second embodiment. Hole 42 is the same. The structure different from the through hole 26 of the second embodiment is a point inclined so that the axis 52a of the through hole 52 becomes an acute angle with respect to the inclination angle A of the leading edge side reference plane of the stator blade web fs (0°

[0081] In addition, part of the side surface on the stator blade trailing edge side of the concave portion 24 is cut into an arcuate surface 24d that is continuous with the wall surface of the through hole 52 in the same direction as the axis 52a. The arcuate surface 24d is a surface required w...

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PUM

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Abstract

The purpose of the present invention is to improve the removal efficiency of the water film flow formed on the blade surface of the stator blade through simple processing of the stator blade, and suppress the decrease of the turbine efficiency by suppressing the leakage loss of the steam flow, and has a The inner hollow part (12a) and the slit hole (22) opening on the blade surface of the stator blade, communicating with the hollow part (12a) and extending along the blade height direction (b) of the stator blade (12), the slit hole ( 22) Concavity (24) engraved on the vane surface of the stator blade with the long side extending along the blade height direction (b) and having a flat bottom surface (24a), and the bottom surface (24a) and hollow portion (12a) passing through the concave portion (24) ) of one or more through holes (26) are formed, and the region of the inlet opening (c) of the through hole (26) opening at the bottom surface (24a) is on the projection plane projecting the cross section of the slit hole (22) in the blade height direction Occupies part of the projected width of the recess (24).

Description

technical field [0001] The present invention relates to a water removal device capable of efficiently removing water contained in a wet steam flow of a steam turbine, and a method of forming a slit hole on a surface of a stator blade for taking in water adhering to the surface of the stator blade . 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 is urged by the humid steam flow, and flows toward the trailing edge side of the stator blade as a water film flow. Furthermore, the water droplets are shredded a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D9/02F01D25/32
CPCF01D9/041F01D25/32F05D2220/31F05D2230/10F05D2230/12F05D2240/123F05D2250/182F05D2250/294F05D2250/312F05D2260/602
Inventor 高田亮
Owner MITSUBISHI HITACHIPOWER SYST LTD