Method for identifying and setting degree-of-overlapping of steam admission regulating valves for steam turbine

Abstract

The invention discloses a method for identifying and setting a degree-of-overlapping of steam admission regulating valves for a steam turbine. According to the method, on the basis of the analysis and the summarization of indexes of regulating valve step amplitudes, flow linearity degrees, valve-point-working-condition throttling losses and the like, in a valve position overlapping area, of the steam admission regulating valves, which are turned on before and later, of the steam turbine, through technical and economical measures and from two aspects of safety and economical efficiency, the systematic and scientific identification is carried out on the reasonability of the degree-of-overlapping of the steam admission regulating valves for the steam turbine; and a standard or a basis, which not only can be used for guaranteeing that the steam admission flows, in the valve position overlapping area, of the steam admission regulating valves for the steam turbine are accurately controlled and further a speed regulating system safely runs, but also can be used for decreasing an inherent throttling loss of a steam distributing mechanism in a valve point working condition, and is applicable in a broad-spectrum manner, for setting the degree-of-overlapping of steam admission regulating valves is formed, so as to realize the accurate control of the steam admission flows, in the valve position overlapping area, of regulating valves and the safe and high-efficiency running of a steam turbine set.

Description

technical field [0001] The invention relates to a method for identifying and setting the overlapping degree of a steam inlet regulating valve of a steam turbine, and belongs to the technical field of steam turbine equipment operation. Background technique [0002] During operation, the steam turbine unit often increases the steam inlet flow of the steam turbine by sequentially (or synchronously) opening several steam inlet regulating valves. Usually, the numerical correspondence between the total valve position opening of the entire inlet steam regulating valve group and the valve position opening of each inlet steam regulating valve and the steam inlet flow of the steam turbine is called the steam turbine flow characteristic. Since the overall flow characteristic of a single inlet steam regulating valve is not completely linear, when its lift flow characteristic curve reaches a certain degree of opening, it will enter the nonlinear region (generally the inlet valve is befor...

AI Technical Summary

Problems solved by technology

[0006] To sum up, the current control valve overlap setting lacks a broad-spectrum applicable implementation standard or basis. The key point of its breakthrough is to establish a numerical quantification of the influence of the control valve overlap on the flow characteristics and thermal economic characteristics.

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