Online power station main steam flow calculation method based on flow correction

A technology of main steam flow and calculation method, which is applied in the field of machine learning modeling and can solve problems such as poor adaptability, poor robustness, and reducing the accuracy of steam flow calculation results.

Active Publication Date: 2015-07-01
SOUTHEAST UNIV +1
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Problems solved by technology

[0003] The direct measurement method refers to direct measurement by installing throttling devices such as orifice plates, but this method will cause a large throttling loss
The basic principle of the indirect measurement method is to calculate the main steam flow based on the pressure after the adjustment stage. T

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  • Online power station main steam flow calculation method based on flow correction
  • Online power station main steam flow calculation method based on flow correction
  • Online power station main steam flow calculation method based on flow correction

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the accompanying drawings.

[0053] Taking a 600MW supercritical intermediate reheat condensing unit in a power station as an example, the data in the SIS system was collected from 10:00 on April 1, 2014 to 10:00 on April 10, 2014, with an interval of 1 minute. The framework of the present invention mainly includes core modules such as input data preprocessing, flow checking module, main steam flow calculation module, and pressure soft measurement at the regulating level. The detailed process is as follows: figure 1 Shown:

[0054] 1) Field data is output to the data interface via the network switch;

[0055] 2) Collect the condensate flow (D ns ), feed water flow (D gs ), steam leakage of medium pressure door lever (D kf ), high-pressure door lever steam leakage (D af ), reheat spray flow (D zr ), superheated spray flow (D gr ), unit load (P load ), post-stage pressure (P 10 ), post-stag...

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Abstract

The invention relates to an online power station main steam flow calculation method based on flow correction. According to the method, an online main steam flow calculation model is corrected through a mass flow balance equation, the model finishes flow calibration on the basis of condensate water flow measured by a spray nozzle, under the different load working conditions, iteration method verifying calculation is utilized to obtain the main steam flow value, the Friuli Greig formula is corrected through the verified main steam flow measuring value, and finally an online main steam flow calculation model is built and obtained. By means of the method, the change tendency of the main steam flow can be reflected quickly, and meanwhile the high accuracy of the flow can be guaranteed. Considering the situation that sensor drift distortion occurs in a field adjusting level pressure measuring point, whether the adjusting level pressure value is distorted or not is judged according to the association coefficient, accordingly an adjusting level pressure soft measurement replacement solution is proposed, and the stability of an online main steam flow calculation module is guaranteed. The online main steam flow calculation strategy can be referred to by a power station and be used for conducting economic analysis.

Description

technical field [0001] The invention relates to an online calculation method for main steam flow of a power station, and a soft sensor model combined with comprehensive principal component analysis and support vector machine belongs to the field of machine learning modeling. Background technique [0002] In the process industry, there are some variables that cannot be directly measured or measured with a large lag, and need to be estimated by establishing a model through soft-sensing technology. In the online performance monitoring and optimization management system of thermal power units, the calculation of economic indicators such as heat consumption rate and coal consumption rate needs to use the main steam flow rate, and the accuracy of the calculation of the main steam flow rate will directly affect the reliability of unit performance calculation and operation optimization. sex. At present, the main steam flow methods of the computer group mainly include direct measure...

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Application Information

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IPC IPC(8): G01F1/86
Inventor 司风琪朱正香顾慧吴跃明
Owner SOUTHEAST UNIV
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