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

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...

AI Technical Summary

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

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