Steam turbine low-pressure final-stage temperature field prediction method and device

Abstract

The invention provides a steam turbine low-pressure final-stage temperature field prediction method and device, and the method comprises the steps: carrying out the screening of obtained historical operation state parameters of a steam turbine, and obtaining a historical operation state parameter sample set and a target parameter temperature field data set; training the historical operation stateparameter sample data set and the target parameter temperature field data set by using a K nearest neighbor algorithm to obtain neighbor sample parameters; and generating a turbine low-pressure final-stage temperature field prediction value corresponding to the current running state parameter according to the obtained current running state parameter of the turbine and the neighbor sample parameter. According to the steam turbine low-pressure final-stage temperature field prediction method and device, the steam turbine low-pressure final-stage temperature field prediction value can be generatedaccording to the current operation state parameters of the steam turbine low-pressure cylinder so that the water spraying amount in the low-pressure cylinder can be reasonably adjusted subsequently,and water erosion to final-stage blades caused by water spraying can be reduced.

Description

technical field [0001] This application relates to the field of industrial control, in particular to a method and device for predicting the temperature field of the low-pressure final stage of a steam turbine. Background technique [0002] With the increasingly prominent contradiction between thermal load and electrical load supply in winter heating conditions of power stations in northern regions, optimized thermoelectric decoupling technology has been gradually popularized and applied. Among them, the low-pressure cylinder zero output technology is a relatively novel optimized thermoelectric decoupling technology, because it can effectively improve the heat-to-electricity ratio of the power supply unit by greatly reducing the steam intake of the low-pressure cylinder, and has been widely used in northern power stations in recent years. [0003] The low-pressure cylinder zero output technology needs to accurately control the steam flow rate of the low-pressure cylinder in a...

AI Technical Summary

Problems solved by technology

The test preparation process of the existing method is relatively complicated. At present, there is no method to obtain the temperature field of the low-pressure final stage of the steam turbine by means of soft sensing

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