A Correction Method of Flow Characteristics of Steam Turbine Control Valve

Abstract

The invention belongs to the technical field of steam turbine power generation and discloses a steam turbine regulating valve flow characteristic correcting method. The method comprises the steps of: obtaining an ideal flow characteristic function of a steam turbine regulating valve; in the process that the load of the steam turbine rises from lowest stable burning load to a rated load, sampling the load of the steam turbine, obtaining a plurality of load sampling values, recording a comprehensive valve location and a main steam flow corresponding to each load sampling value, and obtaining a practical transfer function between the comprehensive valve location and the main steam flow of the steam turbine; calculating a correcting function of the steam turbine flow characteristic; and correcting the practical transfer function between the comprehensive valve location and the main steam flow of the steam turbine, and enabling the steam turbine regulating valve flow characteristic to meet the ideal flow characteristic. According to the invention, the manual workload is reduced, and the safety and economic performance of the set are simultaneously improved.

Description

technical field [0001] The invention relates to the technical field of steam turbine power generation, and in particular to a method for correcting flow characteristics of a steam turbine regulating valve. The method is specifically a method for testing the flow characteristics of a steam turbine regulating valve based on modeling and simulation technology. Background technique [0002] The flow characteristics of the steam turbine regulating valve refer to the corresponding relationship between the steam flow passing through the high-speed valve of the steam turbine and the opening of the valve. If the flow characteristic function of the steam turbine regulating valve is quite different from the actual valve flow characteristic, it will cause the regulating valve to shake, increase the throttling loss, poor primary frequency adjustment ability, poor unit automatic generation control (AGC) response ability, and when the steam distribution mode is switched Large load fluctuat...

AI Technical Summary

Problems solved by technology

Although this method starts from the steam turbine valve flow mechanism and the electro-hydraulic control (DEH) scheme, the modification process involves the determination of the flow characteristics of a single valve and the degree of valve overlap. The modification process is complicated and requires high experience for the test personnel. The secondary calibration is not in place, and the valve flow characteristics can only be gradually improved through multiple tests; at the same time, the artificial modification of uncertain factors during the test process increases the test safety risk

Images