Last-stage moving blade of air-cooled feed pump steam turbine

Abstract

The invention discloses a last-stage moving blade of an air-cooled feed pump steam turbine, comprising a blade body, wherein the blade body is an abnormal-shaped body formed by overlapping a plurality of characteristic sections according to a specific rule, the effective height of the blade body is H=365.0mm, and the root diameter of the blade body is Dr=906.8mm. The last-stage moving blade comprises the following characteristic parameters: an established angle c1, a chord length b1, a maximum thickness w1, an axial width Xa and a sectional area A. The overlapping rule of the sections is that the sections are in continuous and smooth transition along a blade height direction from a root end to a top end. The relative value of the blade height H is monotonically increased from 0.0 to 1.0; the established angle c1 is monotonically decreased from 81.830 to 13.670. The changing rule of the chord length b1 is no more than 1.61 and no less than 1.0; the changing rule of the maximum thickness w1 is no more than 2.265 and no less than 1.0; the changing rule of the axial width Xa no more than 3.75 and no less 1.0; and the changing rule of the sectional area A is no more than 4.58 and no less than 1.0. The invention has good dynamic property, small dynamic stress and good damping characteristic and is especially suitable for a 1000MW supercritical unit air-cooled steam turbine.

Description

Technical field: [0001] The invention relates to a moving blade of a steam turbine, in particular to a last-stage moving blade of an air-cooled feed water pump steam turbine. It is especially suitable for air-cooled steam turbines with a power of 1000MW ultra-supercritical units. Background technique: [0002] The steam turbine is one of the three main equipments of the thermal power plant. The moving blade installed on the shaft of the steam turbine is a crucial key component in the steam turbine, especially the structural design of the final stage moving blade, because it involves a wide range of technologies, technical High content and become the core technology of steam turbines. The larger the capacity of the steam turbine and the higher the power generation density, the higher the initial parameters are required, and the larger the exhaust annular area is, the longer the final stage blade is required. The longer the final stage blade, the higher the requirement for th...

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Problems solved by technology

[0010] In addition, the characteristic parameters of the last-stage moving blades of the feedwater pump turbines for the existing subcritical 300MW, subcritical 600MW and supercritical 600MW generating sets are different, there is no unified design specification, and the structure is relatively backward. The dynamic stress is high, and the unit economy is poor

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