Valve position correcting based efficiency monitoring method of full-life high-pressure cylinder of steam turbine

Abstract

The invention discloses a valve position correcting based efficiency monitoring method of a full-life high-pressure cylinder of a steam turbine. The method comprises the following steps: testing performance reference condition; determining a high-pressure cylinder efficiency monitoring reference valve position point and the primary efficiency of the high-pressure cylinder under the reference valveposition point; testing the primary efficiency of the high-pressure cylinder under a unit valve point condition; determining the primary efficiency of the high-pressure cylinder under the valve pointcondition; testing a relation curve between the comprehensive unit valve position and the high-pressure cylinder efficiency; determining the relation curve between the unit high-pressure cylinder efficiency and the comprehensive valve position; exporting data from a DCS system; screening DSC data; calculating the high-pressure cylinder efficiency at each time in the calculating period; correctingthe high-pressure cylinder efficiency at each time in the calculating period to the reference valve position point; calculating the high-pressure cylinder efficiency under the valve point working condition at each time in the calculating period; and drawing a variation curve that the high-pressure cylinder efficiency changes as time goes on under the cylinder efficiency monitoring reference valveposition point and the valve point condition. According to the method, the uniform high-pressure cylinder efficiency comparing reference is built; and the performance change of a high-pressure cylinder of a steam turbine unit can be mastered in real time.

Description

technical field [0001] The invention belongs to the technical field of steam turbine power generation of a thermal power unit, and in particular relates to a method for monitoring the efficiency of a steam turbine's full-life high-pressure cylinder based on valve position correction. Background technique [0002] The steam turbine is the key equipment in the thermal power conversion process in the thermal power plant. The important performance index to describe the performance of the steam turbine is the cylinder efficiency, which reflects the thermal power conversion capacity of the working fluid in the expansion process of the steam turbine. Therefore, obtaining accurate steam turbine cylinder efficiency monitoring data is very important for diagnosis, monitoring and evaluation of steam turbine performance. [0003] The SIS system of the unit often includes preset real-time monitoring data of high-pressure cylinder efficiency, but the data cannot reflect the real-time real...

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Problems solved by technology

[0003] The SIS system of the unit often includes the preset real-time monitoring data of high-pressure cylinder efficiency, but the data cannot reflect the real-time real level of the high-pressure cylinder, because the efficiency of the high-pressure cylinder is affected by the throttling loss and the regulation level caused by the change of the valve opening. The effect of efficiency changes. During the operation of the unit, the valve position of the high-pressure regulating valve is constantly changing with factors such as load, main steam pressure, back pressure, and power grid frequency regulation. Therefore, the efficiency of the high-pressure cylinder monitored in the SIS system cannot be compared with the design value. make a direct comparison

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