Backpressure correction function setting method and system related to turbine valve management

Abstract

The invention provides a backpressure correction function setting method and system related to turbine valve management. The method comprises the steps that a turbine unit high adjusting valve is controlled to be completely opened, and the pressure of a turbine unit is increased to the rated main steam pressure value; the boiler following mode is input, the pressure of the turbine unit is controlled at the rated main steam pressure value, and the main steam pressure is controlled by a boiler master control automatic closed loop; the master control instruction of the turbine unit is reduced, and the load of the turbine unit is reduced to the set specific value; adjusting level pressure and main steam pressure parameter feature data are collected; on the basis of the collected adjusting level pressure and main steam pressure parameter feature data, various main steam flow data are calculated, and the main steam flow percent is obtained; and the critical pressure ratio serves as the reference segment point, and corresponding nozzle area flow data are calculated in a segmented manner. According to the backpressure correction function setting method and system, the turbine valve management backpressure correction function is set, the turbine valve flow management control reliability, one-time frequency modulation and load control quality are improved, and the power grid control requirement is met.

Description

Technical field [0001] The present disclosure relates to the technical field of steam turbines, and in particular to a method and system for setting back pressure correction functions 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 Determined by the size 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 accurately ma...

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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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