Large-load last stage blade with steam exhaust area of 5.0 m<2>

Abstract

The invention relates to a the field of industrial steam turbine blades, and particularly discloses a large-load last stage blade which has a steam exhaust area of 5.0 m<2>, is large in steam exhaust area and high in aerodynamic efficiency and can meet the operating requirements of large-load variable working conditions. A lashing strip, a blade working part and a blade root of the blade are forged into a whole from top to bottom, wherein a boss lacing wire is arranged in the position, 0.550 mm relative to a blade height from bottom to top, of the blade working part and integrated with the blade working part; a molded line of the blade working part adopts a variable cross-section twisted blade, the height of the working part is 661.92 mm, the axial width of the root of the working part is 231.11 mm, the diameter of the root is 728 mm, and the steam exhaust area of the blade working part is 5.0 m<2>; and the blade root adopts a fir-shaped oblique blade root, and the axial width is 272 mm. The large-load last stage blade with the steam exhaust area of 5.0 m<2> has the advantages of high aerodynamic efficiency, good strength performance, large steam exhaust area and the like, has the characteristics of convenience in assembly and stable structure, and can be widely applied to a large-load industrial steam turbine with a variable working condition.

Description

technical field [0001] The invention relates to the field of industrial steam turbine blades, in particular to a steam exhaust area of ​​5.0m 2 Heavy duty last stage blades. Background technique [0002] The industrial steam turbine unit is a typical variable operating condition unit. Its large-scale variable operating condition operation characteristics put forward high requirements for the steam turbine blades. Especially for the last-stage blades of heavy-duty units, the working conditions are very harsh, and the reliability of the blades directly affects the safe operation of the unit. The design technology of the final moving blade has become the core technology in the design of steam turbines due to the wide range of technologies involved and the high technical content. [0003] Previously, most industrial steam turbines had small exhaust area, low aerodynamic efficiency, and large energy consumption. They could not meet the operating requirements for large-load oper...

AI Technical Summary

Problems solved by technology

[0003] Previously, most industrial steam turbines had small exhaust area, low aerodynamic efficiency, and large energy consumption. They could not meet the operating requirements for large-load operating conditions. Therefore, it is necessary to develop industrial steam turbines that meet the requirements of large-load operation. The final stage blades are crucial

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