High-rotating-speed and high-load last-stage movable vane for industrial steam turbine

Abstract

The invention relates to the field of industrial steam turbine vanes and particularly discloses a high-load last-stage movable vane with the steam exhausting area being 1.3 m2. The high-load last-stage movable vane can meet the requirement for high-rotating-speed and high-load operation. The movable vane comprises a vane body, a vane root, a girdle used for enabling the vane to form whole-ring self-locking, and a boss. A molded line of the vane body is a variable cross section twisted vane. The height of the working portion is 393.05 mm. The axis width of the root portion of the working portion is 113.07 mm. The diameter of the root portion is 662.44 mm. The change rule of pitch and chord length ratio T / b from the vane root cross section to the vane top cross section is 0.28<=T / b<=0.89. The change rule of pitch and vane type cross section axial width ratio T / B from the vane root cross section to the vane top cross section is 0.28<=T / B<=3.9. The steam exhausting area of the vane body is1.3 m2. A fir type oblique vane root is adopted as the vane root. The axial width is 120 mm. The total height of the vane root is 34.20 mm. The high-rotating-speed and high-load last-stage movable vane with the steam exhausting area being 1.3 m2 has the advantages of being high in pneumatic efficiency, good in strength performance, reasonable in structure, convenient to assemble and the like, andcan be widely applied to a high-rotating-speed and high-load industrial steam turbine.

Description

technical field

[0001] The invention relates to the field of industrial steam turbines, in particular to a steam exhaust area of ​​1.3m 2 High-speed and high-load final stage moving blades. Background technique

[0002] In the field of industrial power generation, a steam turbine with a fixed speed of 3000r / min is generally used. This kind of steam turbine has high cost and low efficiency below 50MW, which seriously affects energy utilization efficiency and is not good for energy saving and emission reduction. Contents of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned technology and design a kind of high-speed high-load industrial steam turbine with the last-stage movable blade. The blade speed is 6600r / min, which is 2.2 times that of the conventional 3000r / min blade speed. The efficiency of the blade is improved, the size of the steam turbine is reduced, and the cost of the steam turbine is reduced. The bl...

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