835mm last-stage moving blade suitable for running under low-load working condition

A low-load, moving blade technology, applied in blade support elements, engine elements, machines/engines, etc., can solve problems such as inability to apply peak-shaving units, lack of availability, etc., to achieve optimal flow efficiency and strength, vibration characteristics, and vibration. Vibration problems are improved and blade dynamic stress is significantly reduced

Pending Publication Date: 2019-12-13
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the change of total domestic electricity consumption, the requirements for the peak-shaving capability of power plant units are getting higher and higher. When the unit is operating under low-load conditions, there are safety hazards such as strength risks and dynamic stress risks caused by flutter in the final blades of the steam turbines.
At present, the 900A series blades (including 900A2 blades) of the upper and last stage blades of the existing steam turbines do not have the ability to directly operate under low-load conditions (not equipped with cylinder cutting) due to the above-mentioned safety problems, and cannot be applied to various peak-shaving units

Method used

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  • 835mm last-stage moving blade suitable for running under low-load working condition
  • 835mm last-stage moving blade suitable for running under low-load working condition
  • 835mm last-stage moving blade suitable for running under low-load working condition

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Experimental program
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Effect test

specific Embodiment approach 1

[0018] Specific implementation mode one: combine Figure 1-Figure 5 Describe this embodiment, an 835mm last-stage moving blade suitable for low-load operation in this embodiment includes a blade working part 1 and a blade root 2; it also includes boss ribs 3 and perforated ribs 4. Part 1, boss tie bar 3 and blade root 2 are forged together from top to bottom. The perforated tie bar 4 is located in the middle of the blade working part 1 and adopts a half-section form. The profile of the blade working part 1 is a variable cross-section twisted blade , there is relative torsion between two adjacent sections, the cross-sectional area of ​​the blade working part 1 decreases gradually from the root to the top, the height L of the blade working part 1 is 835 mm, the root axial width V of the blade working part 1 is 160 mm, and the blade working part 1 root diameter of part 1 is 1700mm, and the exhaust area of ​​blade working part 1 is 6.65m 2 , the blade root 2 is an arc-shaped fi...

specific Embodiment approach 2

[0020] Specific implementation mode two: combination figure 1 , Figure 5 , Figure 6 and Figure 7 To illustrate this embodiment, the variation range from the root axial width V of the blade working part 1 to the top axial width of the blade working part 1 is 160mm-40.739mm, and the variation range of the chord length b is 166.432mm-104.453mm , installation angle β y The range of change is 75.39°-28.34°, the range of maximum thickness T of the molding line is 18.98mm-6.14mm, the range of inlet angle α is 45.45°-152.04°, and the range of outlet angle θ is 33.1°-23.1° . By adopting the above structural parameters, the blades can be easily assembled while ensuring that the outer structure dimensions of the blades meet the design requirements. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0021] Specific implementation mode three: combination figure 1 , Figure 5 , Figure 6 and Figure 7 Describe this embodiment, the height L of blade working part 1 of this embodiment is respectively 0mm, 28mm, 49.4mm, 98.8mm, 148.1mm, 197.5mm, 246.9mm, 296.3mm, 345.7mm, 390mm, 410mm, 444.4mm, The axial width B of blade working part 1 corresponding to 493.8mm, 543.2mm, 592.6mm, 641.9mm, 693.1mm, 740.7mm, 790.1mm, 839.5mm are respectively: 160mm, 155.975mm, 152.882mm, 145.708mm, 138.439mm, 131.032 mm, 123.516mm, 115.91mm, 108.209mm, 100.395mm, 97.2118mm, 92.513mm, 84.574 mm, 76.611mm, 68.823mm, 61.495mm, 54.796mm, 48.885mm, 44.9739mm, corresponding The chord lengths b are respectively: 165.432mm, 162.53mm, 160.38mm, 155.626mm, 151.117mm, 146.763mm, 142.498mm, 138.2mm, 133.886mm, 129.644mm, 127.905mm, 125.565mm, 121.780mm, 318.3mm 115.296mm, 112.809mm, 110.672mm, 108.858mm, 105.514 mm, 104.453mm, the corresponding installation angle β y They are: 75.3852°, 73.755°, 72.4741°...

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Abstract

The invention provides a 835mm last-stage moving blade suitable for running under a low-load working condition and relates to a last-stage moving blade. The 835mm last-stage moving blade comprises a blade working part and a blade root and further comprises a lug boss pull rib and a hole passing pull rib; the blade working part, the lug boss pull rib and the blade root are subjected to die forgingfrom top to bottom to form an integrated structure; the hole passing pull rib is positioned at the middle part of the blade working part and is in a half-split form; the molded line of the blade working part is a variable-section twisted blade; relative torsion exists between two adjacent sections; the area of the section, from the root to the top, of the blade working part is gradually reduced; the height of the blade working part is 835 mm; the axial width of the root part of the blade working part is 160 mm; the steam discharging area of the blade working part is 6.65 m<2>; the blade root is a circular arc type fir-shaped blade root; and the axial width of the blade root is 190 mm. The 835mm last-stage moving blade provided by the invention is applied to a turbine of a heavy duty gas turbine engine. The last-stage moving blade provided by the invention improves the safety of the overall blade structure and guarantees safe and stable running of the unit under the low-load working condition.

Description

technical field [0001] The invention relates to a last-stage moving blade, in particular to an 835mm final-stage moving blade suitable for low-load operation of a power plant unit. Background technique [0002] With the change of total domestic electricity consumption, the requirements for the peak-shaving capability of power plant units are getting higher and higher. When the unit is operating under low-load conditions, there are safety hazards such as strength risks and dynamic stress risks caused by flutter in the final blades of the steam turbine. At present, the 900A series blades (including 900A2 blades) of the upper and last stage blades of the existing steam turbines do not have the ability to directly operate under low-load conditions (no cylinder cutting) due to the above-mentioned safety problems, and cannot be applied to various peak-shaving units . Contents of the invention [0003] The present invention is to overcome the deficiencies of the prior art and pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/14F01D5/30
CPCF01D5/141F01D5/147F01D5/30
Inventor 张迪丁怀臣李宇峰刘云锋马义良王健李央梁天赋达富林赵洪羽刘瑶马天吟高铁印
Owner HARBIN TURBINE
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