Steam turbine and sliding pressure curve correction method and system based on load reception capacity of steam turbine

Abstract

The invention discloses a sliding pressure curve correction method based on the load reception capacity. The method comprises the steps that a sliding pressure curve about unit loads and main steam pressure set values of a steam turbine is obtained; a main steam regulation door is moved to the reset optimal regulation door opening by adjusting the main steam pressure related to the unit loads, the deviation between the unit loads and an AGC instruction is made to meet the preset condition, and thus a correction curve about different unit loads and the corresponding main steam pressure correction values is obtained; and the correction curve is overlapped to the sliding pressure curve for correction of the main steam pressure set values. According to the sliding pressure curve correction method disclosed by the invention, pressure adjustment is performed according to the main steam pressure set values corrected by the correction values, and the current main steam pressure of the steam turbine can reach the set values of the ideal state; and meanwhile, the regulation door opening of the steam turbine is made to reach the optimal position, and thus influences of the environmental temperature, the steam turbine characteristics, the heat supply steam extraction capacity change and other environmental factors on the sliding pressure curve are eliminated.

Description

technical field [0001] The invention relates to the technical field of thermal control, in particular to a sliding pressure curve correction method based on load receiving capacity. The invention also relates to a sliding pressure curve correction system based on load receiving capacity and a steam turbine. Background technique [0002] With the changes in the structure of power generation enterprises in China, the proportion of new energy power generation enterprises in the power grid is increasing, which requires thermal power plants to participate more in power grid peak regulation and primary frequency regulation, and the requirements for AGC performance are getting higher and higher . However, with the improvement of AGC performance, the rationality of the main steam pressure setting in thermal power plants becomes more and more important. Among them, the AGC (Automatic Generation Control, automatic generation control) system refers to the dispatching system of the po...

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Problems solved by technology

[0004] However, the sliding pressure curve is only applicable to specific working conditions and cannot meet the various working conditions of the unit operation. Due to changes in ambient temperature and characteristics of steam turbines, some thermal power plants even operate in pure condensing conditions in summer and provide heat in winter. As a result, the fixed sliding pressure curve cannot meet the needs of safe and economical operation of the unit, and even affects the load connection capacity of the unit, resulting in a significant decline in the AGC performance of the unit, and greatly increasing the assessment of the two detailed rules

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