Last stage blade for half speed nuclear power steam turbine

Abstract

The invention discloses a last stage blade for a half speed nuclear power steam turbine. A blade body is a special body formed by laminating a plurality of characteristic sections according to a specific rule, and has the effective height H and root diameter Dr; a characteristic parameter installation angle c1, a chord length b1, the maximum thickness W1, an axial width Xa and a sectional area A are provided; the laminating rule of the sections is that the sections are continuously and smoothly transited from the root end to the top end along the blade height direction; a relative value of the blade height H is monotonously increased to 1.0 from 0.0; correspondingly, the installation angle c1 is monotonously decreased to 10.8 degrees from 80.99 degrees; a change rule of the sectional area A is that A is more than or equal to 1 and less than or equal to 5.564; a change rule of the axial width Xa is that Xa is more than or equal to 1.0 and less than or equal to 8.437; a change rule of the chord length b1 is that b1 is more than or equal to 1.0 and less than or equal to 1.556; and a change rule of the maximum thickness W1 is that W1 is more than or equal to 1.0 and less than or equal to 3.131. The dynamic stress of the blade can be greatly reduced, the rigidity of the blade can be improved and the blade safety requirement can be met; and the blade is suitable for nuclear power steam turbines with the rated speed of 1,500 rpm, and particularly suitable for nuclear power steam turbines with the back pressure of 3-6kPa, the power of 1,000-1,700MW and the rotating speed of 1,500rpm.

Description

technical field [0001] The invention relates to a steam turbine blade, in particular to a last-stage blade for a half-speed nuclear power steam turbine. It is suitable for nuclear power steam turbines with a rated speed of 1500 rpm, especially for nuclear power steam turbines with a back pressure of 3-6kPa, a power of 1000-1700MW, and a speed of 1500rpm. Background technique [0002] As one of the clean energy sources, nuclear power has the characteristics of stably producing a large amount of electricity. It effectively addresses a series of environmental issues such as energy depletion, the global warming effect, and control of carbon dioxide emissions. [0003] In recent years, actively promoting the construction of nuclear power has become an important strategy in my country. It is necessary to meet the growing energy demand of economic and social development, ensure energy supply and safety, protect the environment, achieve my country's greenhouse gas control goals, and...

AI Technical Summary

Problems solved by technology

Due to the high technical content of the final stage blades of nuclear power, when imported from abroad, they are always passive and accept a series of harsh conditions, and the price is extremely high; while domestically produced nuclear power final stage blades, due to technical limitations, The scope of application is limited, and it cannot be applied to higher-power nuclear power steam turbines, which directly affects the progress of my country's nuclear power industry, which in turn affects the construction of the national economy

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