Method for realizing main steam pressure tracking optimization of steam turbine

Abstract

The invention provides a method for realizing main steam pressure traction optimization of a steam turbine on the basis of mathematical modeling of heat loss correlated quantity and relates to a control technology of variable working condition optimized operation of a power station steam turbine. According to the method, a correlation variable K between heat loss and main steam pressure of a turbine unit is proposed; according to core parameters correlated with the main steam pressure and heat loss of the turbine unit, such as main steam flow, main steam pressure, exhaust steam pressure of a high-pressure cylinder, exhaust steam temperature of the high-pressure cylinder, attemperating water flow, one-section extraction pressure, one-section extraction temperature, rotation speed of a small steam turbine or current of an electric pump and condenser backpressure, a comprehensive equivalent heat loss K is obtained through an equivalent enthalpy drop method; and an operation tracking optimization model is established by taking the intermediate variable K as a target function. Through the modeling optimization of the intermediate variable K, the main steam pressure curve of the turbine unit under different main steam flows is determined and the tracking control of the main steam pressure is performed further. A characteristic database is updated according to the real-time operation parameters so that the main steam pressure curve is closer to the theoretically optimized operation curve of the turbine unit.

Description

technical field [0001] The invention relates to an optimal control method of thermal energy machinery, in particular to a variable working condition optimal operation control method of a steam turbine in a power station. Background technique [0002] Energy conservation and emission reduction has gradually become a hot topic of global concern. Improving energy utilization and reducing energy consumption has become a historical task for researchers in all walks of life. As a supporting industry for industrial development and social and economic progress, electric power occupies a very important position in the energy structure, among which coal resources consumed by thermal power generation account for about half of the total coal consumption. [0003] Due to the difference in different seasons and different times of industrial production electricity and civilian electricity, the difference is very obvious. In order to meet the greatest needs of users, the total installed ca...

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Problems solved by technology

[0006] In order to overcome the technical defects existing in the field of optimized operation of domestic steam turbines and fundamentally solve the problem of real-time optimization of the main steam pressure of the unit, the present invention proposes a method for tracking and optimizing the main steam pressure of steam turbines based on mathematical modeling of heat consumption related quantities

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