A Steam Turbine Flow Curve Identification and Optimization Method Based on Power Value Calculation

Abstract

The invention discloses a steam turbine flow curve identification and optimization method based on power value calculation. The method includes the following steps that firstly, a plurality of sampling test points are set, and real-time working condition data are collected; secondly, vacancy working condition data and abnormal working condition data are deleted; thirdly, an output power value, a main steam pressure value and a total valve position value are selected to continuously stabilize the real-time working condition data of a plurality of sampling periods, and mean value treatment is carried out on various parameters; fourthly, a target data set is mined through the K-central point algorithm; fifthly, on the basis of power value calculation, a steam turbine adjustment valve bank flow characteristic curve under specific main steam pressure is identified; and sixthly, a steam turbine adjustment valve bank flow characteristic curve under rated main steam pressure is extracted, and a sector with unreasonable linearity is analyzed and optimized. The steam turbine flow curve identification and optimization method can be used for identifying the actual flow characteristic curve under the specific main steam pressure of a steam turbine adjustment valve bank, so that the specific adjustment valve bank flow characteristic curve is consistent with the actual curve, and safe and stable operation of a steam turbine unit is guaranteed.

Description

Technical field [0001] The invention relates to the technical field of steam turbine power generation, in particular to a method for identifying and optimizing a steam turbine flow curve based on power value calculation. Background technique [0002] The steam turbine is the most widely used prime mover in modern thermal power plants. The flow characteristic curve of the gate valve group is determined according to the original design. However, many old units in service, especially after DEH transformation, steam turbine flow part transformation or through In the overhauled unit, the flow characteristic setting curve of the gate valve group is often inconsistent with the actual curve. As the main actuator of the DEH system, the steam turbine governing valve group has excessive flow characteristics deviations, resulting in increased steam turbine throttle loss, insufficient or excessive primary frequency response load, slow AGC response, and valve switching load fluctuations, which...

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Problems solved by technology

[0002] Steam turbine is the most widely used prime mover in modern thermal power plants, and the flow characteristic curve of its regulating valve group is determined according to the original design. In overhauled units, it often happens that the flow characteristic setting curve of the valve group is inconsistent with the actual curve

As the main actuator of the DEH system, the steam turbine valve group is the main actuator of the DEH system. If the deviation of its flow characteristics is too large, the throttling loss of the steam turbine will increase, the response load of primary frequency regulation will be insufficient or too large, the AGC response will be slow, and the valve switching load will fluctuate. Safe and stable operation of the unit

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