A steam turbine flow curve identification and optimization method based on nozzle flow calculation

Abstract

The invention discloses a steam turbine flow curve identifying and optimizing method based on spray nozzle flow calculation. The steam turbine flow curve identifying and optimizing method comprises the following steps: A, setting a plurality of sampling measure points, and acquiring real-time working condition data; B, clearing vacant working condition data and abnormal working condition data; C, selecting the real-time working data that an output power value, a primary steam pressure value and a total valve location value are continuously stabilized for a plurality of sampling periods, and carrying out equalization processing on various parameters; D, adopting a K-center clustering algorithm to excavate a target data set; E, based on spray nozzle flow calculation, identifying a steam turbine control valve set flow characteristic curve under special primary steam pressure; and F, extracting the steam turbine control valve set flow characteristic curve under rated primary steam pressure, and analyzing and optimizing a region with unreasonable degree of linearity. According to the steam turbine flow curve identifying and optimizing method, a practical flow characteristic curve, under special primary steam pressure, of the steam turbine control valve set can be identified and optimized, so that the control valve set flow characteristic setting curve is consistent with the practical curve, and therefore, 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 steam turbine flow curve identification and optimization method based on nozzle flow calculation. Background technique [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 regulating 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. The safe...

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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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