An Online Calculation Method of Main Steam Flow in Power Station 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 the problems of reducing the accuracy, adaptability and poor robustness of steam flow calculation results.

Active Publication Date: 2017-11-03
SOUTHEAST UNIV +1
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  • Abstract
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  • Claims
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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. This method is affected by the fouling of the flow part, which will reduce the accuracy of the calculation result of the steam flow.
The main steam flow model based on the neural network will be applied to the soft sensor by the machine learning method, but it has the disadvantages of poor adaptability and robustness

Method used

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  • An Online Calculation Method of Main Steam Flow in Power Station Based on Flow Correction
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  • An Online Calculation Method of Main Steam Flow in Power Station 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 calculation method of main steam flow in a power station based on flow correction. The online calculation model of main steam flow is corrected by the mass flow balance equation. In this case, the iterative method is used to check and calculate the main steam flow value, and the calibrated main steam flow measurement value is used to correct the Fruger formula, and finally the online calculation model of the main steam flow is established. This method can not only quickly reflect the change trend of the main steam flow rate, but also ensure high accuracy of the flow rate. Considering the situation of sensor drift and distortion at the pressure measuring point of the on-site regulation stage, according to the correlation coefficient, it is determined whether the pressure value of the regulation stage is distorted, and then a soft measurement alternative for the pressure of the regulation stage is proposed to ensure the stability of the main steam flow online calculation module. The online calculation strategy of the main steam flow proposed by the present invention can be used as a reference for power plants and for 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/86
Inventor 司风琪朱正香顾慧吴跃明
Owner SOUTHEAST UNIV
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