A Test Method for Flow Characteristics of Nozzle Distribution Steam Turbine

Abstract

A method for testing the flow characteristics of a steam turbine with nozzle distribution. In the method, the steam distribution end of the steam turbine is assumed to be an equivalent nozzle, and the pressure before the equivalent nozzle, the pressure after the nozzle and the pressure ratio of the equivalent nozzle are used as variables, and the "indirect method" or " Direct method" two different mapping methods, indirect numerical mapping of "actual flow - flow ratio - control valve valve position command" of the steam turbine (when the intermediate conversion link "flow ratio" is removed, it is direct mapping), and The fine adjustment of the overlapping degree of the regulating valve is realized by setting the dual means of "limiting the opening degree of the regulating valve under the increase of each unit of steam flow" and numerical quantification "the degree of influence of the throttling loss of the regulating valve on the heat consumption of the steam turbine unit", In this way, the steam distribution function consistent with the actual flow characteristics of the steam turbine is obtained, and the precise control of the steam inlet flow of the steam turbine under different valve management modes is realized. The invention is applicable to the setting of the flow characteristic of the nozzle steam distribution steam turbine and the research on the comprehensive optimization control of the operation mode of the steam distribution end of the steam turbine.

Description

technical field

[0001] The invention relates to a flow characteristic test method of a steam turbine with nozzle distribution, and belongs to the technical field of steam turbine generator unit operation. Background technique

[0002] During the operation of the steam turbine using nozzle steam distribution, the inlet steam flow of the steam turbine is increased by sequentially (or synchronously) opening several regulating valves. Usually, the numerical corresponding relationship between the total valve position command of the entire control valve group and the valve position commands of each control valve and the inlet steam flow of the steam turbine is regarded as the flow characteristic of the steam turbine. The digital electro-hydraulic control system (DEH) of the steam turbine realizes the precise control of the steam inlet flow of the steam turbine through the built-in valve management function of the steam distribution function. The steam turbine flow characteristic ...

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