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Last stage movable vane of air cooling steam turbine

A technology of steam turbines and moving blades, which is applied in the direction of machines/engines, blade support components, mechanical equipment, etc., and can solve problems such as high blade dynamic stress, poor unit economy, and backward structure

Active Publication Date: 2010-12-29
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned blades belong to the first generation of air-cooled last-stage blades, with backward structure, high dynamic stress of the blades, and poor economic efficiency of the unit

Method used

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  • Last stage movable vane of air cooling steam turbine
  • Last stage movable vane of air cooling steam turbine
  • Last stage movable vane of air cooling steam turbine

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Embodiment Construction

[0023] see figure 1 , figure 2 , Figure 4 The invention adopts suitable alloy steel blades and rotor materials, and the moving blade manufactured according to the design drawing of this patent is composed of 4 parts, which are respectively: shroud body 1, damping tension hole 2, blade body 3, and blade root 4. All parts are integrally manufactured with the same high-strength alloy steel. The blades are installed in the impeller grooves on the outer circle of the rotating shaft through the 7 fork blade roots 4, and 94 blades are installed in each round of the grooves. When the blades are installed in the impeller grooves of the last week of the impeller, the final stage of the high-power steam turbine is formed. . For a 600MW air-cooled steam turbine, each unit needs four positive and negative stages (4 exhaust ports), and for a 300MW air-cooled steam turbine, each unit requires a total of two positive and negative stages (2 exhaust ports). A steam turbine with a large ex...

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Abstract

The invention relates to a last-stage moving blade for an air-cooled steam turbine. The last-stage moving blade is characterized in that the effective height of the blade is 661 millimeters; the relative value of the height Ld of the blade is monotonically increased from 0.0 to 1.0; the mounting angle c1 is monotonically decreased from 85.13 to 20.03 degrees; the area AI from the root section to the top section has the following change rule that the AI is more than or equal to 1.0 and less than or equal to 3.82; the axial width Xa from the root section to the top section has the following change law that the Xa is more than or equal to 1.0 and less than 1.0 or equal to 4.749; the chord length b1 from the root section to the top section has the following change law that the b1 is more thanor equal to 1.0 and less than or equal to 1.627; and the largest depth W1 from the root section to the top section has the following change law that the W1 is more than or equal to 1.0 and less than or equal to 1.748. The last-stage moving blade is suitable for an undercritical and supercritical air-cooled steam turbine with the power of between 300 and 600 MW and the rotational speed of 3, 000 rpm.

Description

technical field [0001] The invention relates to a moving blade of a steam turbine, which is suitable for subcritical and supercritical air-cooled steam turbines with a power of 300MW to 600MW and a rotating speed of 3000rpm. Background technique [0002] The air-cooled steam turbine is a special steam turbine. Its particularity lies in that it often operates under the condition of high back pressure and small volume flow, and the back pressure changes in a large range and frequently. These operating conditions greatly limit the design of the final stage blades. . Moreover, the economy and safety of the air-cooled steam turbine are closely related to the thermal, aerodynamic, strength, and vibration design of the low-pressure final stage to a large extent. Among them, the design of the low-pressure final stage is the most difficult, and it must be overall considered and complicated multi-factor constraints Only when the scheme is optimized under certain conditions can a high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D5/30F01D5/14
Inventor 王为民吴其林潘家成王建录范小平曹守洪冯斌钟刚云周显丁李伯武
Owner DONGFANG TURBINE CO LTD
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