A back pressure correction function setting method and system related to steam turbine valve management

Abstract

This disclosure proposes a back pressure correction function setting method and system related to steam turbine valve management, including: controlling the full opening of the high-profile door of the steam turbine unit, and raising the pressure of the steam turbine unit to the rated main steam pressure value; putting into the boiler following mode, and controlling the pressure of the steam turbine unit At the rated main steam pressure value, the main steam pressure is automatically closed-loop controlled by the main control of the boiler; the main control command of the steam turbine unit is reduced, and the load of the steam turbine unit is reduced to the set ratio; the characteristic data of the regulating stage pressure and the main steam pressure parameter are collected; the regulation based on the collection Calculate the main steam flow data based on the stage pressure and main steam pressure parameter characteristic data, and obtain the main steam flow percentage; take the critical pressure ratio as the benchmark segment point, and calculate the corresponding nozzle area flow data segmentally. The disclosure sets the back pressure correction function of steam turbine valve management, improves the reliability of steam turbine valve flow management control, the quality of primary frequency modulation and load control, and meets the control requirements of the power grid.

Description

technical field [0001] The disclosure relates to the technical field of steam turbines, in particular to a method and system for setting a back pressure correction function related to steam turbine valve management. Background technique [0002] The back pressure correction in the steam turbine valve management control is the most important control link in the valve flow control scheme. The back pressure correction function in the valve management control is the correction of the load flow command, and the load flow value is corrected to the corresponding nozzle area flow value. The correction value It is determined by the dimensional characteristics of the flow area of ​​the steam turbine valve nozzle. Usually the setting value of the back pressure correction function is given by the steam turbine factory, but with the long-term operation of the steam turbine and the transformation of the flow part, the original back pressure correction function setting can no longer accura...

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Problems solved by technology

Usually the setting value of the back pressure correction function is given by the steam turbine factory, but with the long-term operation of the steam turbine and the transformation of the flow part, the original back pressure correction function setting can no longer accurately match the size characteristics of the flow area of ​​the nozzle, and the inaccuracy of the back pressure correction function will be Directly affect the quality of steam turbine load control, resulting in frequent shaking of the steam turbine valve or poor response ability of primary frequency regulation and other faults

[0003] At present, in the setting of flow characteristics of steam turbine valves, there is a lack of accurate online setting methods for the back pressure correction function. Usually, the back pressure correction function provided by the main engine manufacturer is continued to be used, which cannot truly reflect the size characteristics of the flow area of ​​the nozzle of the steam turbine valve and gives the valve flow characteristics The tuning work has brought constraints, affecting the effect of valve flow characteristic tuning and the quality of steam turbine control

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