Uniform steam admission/supplement device for steam turbine

Abstract

The invention discloses a uniform steam admission / supplement device for a steam turbine. The uniform steam admission / supplement device comprises an annular steam admission flow passage housing and ansteam admission pipeline housing communicating with the steam admission flow passage housing; a steam admission flow passage of a steam flow passage housing is arranged in an axially symmetrical mode,and a cross-sectional area of the steam admission flow passage decreases monotonously in the flow direction of steam admission; the steam admission flow passage housing communicates with the largestcross-sectional area of the steam admission flow passage, and a plurality of steam flow guide vanes are axially and symmetrically arranged on the inner wall of the steam admission flow passage of thesteam flow passage housing. From the point of view of reducing the steam loss and reducing the impact of a steam flow on a rotor, the uniform steam admission / supplement device for the steam turbine adopts a variable cross-section cavity design to adapt to the flow variation of steam during the flowing process, the flow velocity distribution of the steam in each section of the steam admission flowpassage tends to be uniform, the steam admission pressure and temperature loss are reduced, and the efficiency of the steam turbine is improved; the steam admission volume tends to be evenly distributed in the circumferential direction by rationally arranging the steam flow guide vanes, the steam flow force generated by the steam admission to the rotor is reduced, and the safety and stability of the unit operation are improved.

Description

technical field [0001] The invention belongs to the technical field of design of a steam inlet / steam supplement chamber of a medium and low pressure steam turbine, and in particular relates to a uniform steam intake / steam supplement device for a steam turbine. Background technique [0002] A steam turbine is a turbine that uses steam as its medium, and its main purpose is to convert the heat energy carried by the steam into the mechanical energy of the internal rotating parts. High-power steam turbines are one of the key power equipment in the construction of modern large-scale power plants. Improving the efficiency of steam turbines can significantly improve the operating efficiency of power plants and reduce losses. In the total loss of the steam turbine, the loss of inlet steam / admission steam accounts for a relatively large proportion and cannot be ignored. Therefore, if the inlet steam loss can be reduced, the efficiency of the steam turbine can be effectively improved...

AI Technical Summary

Problems solved by technology

[0005] However, this type of spiral structure still has defects. On the one hand, during the steam flow process, due to the lack of separation and guidance of the steam guide vanes, the fluid flow separated from the main flow is uncontrollable, resulting in uneven distribution of the inlet steam along the circumferential direction. On the other hand, due to the uncontrollable flow rate of the separated fluid, the cross-sectional area of ​​the flow channel which decreases monotonically along the steam inlet direction cannot accurately adapt to the change of the steam volume, resulting in uneven flow velocity distribution of the steam on each section of the flow channel , there is an intake steam loss

Although the double-helix steam inlet structure has improved the single-helix steam inlet structure, it has not solved the problem of uneven circumferential distribution of the inlet steam in essence, and further optimization is needed

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