Thermal power plant steam turbine main steam flow measuring method

Abstract

The invention provides a thermal power plant steam turbine main steam flow measuring method. According to the method, the overall pressure stage of a high-pressure cylinder is used as a first-stage group, a main steam flow calculating formular is educed from the Flugel formula. The method specially includes the flow Gr on a variable working condition, the flow G0 on a design condition, the absolute temperature T0 and the pressure P1 of main steam on the design condition, the absolute temperature T0r and the pressure P1r of the main steam on the variable working condition, the steam exhaust pressure P2 of the high-pressure cylinder on the design condition, and the steam exhaust pressure of the high-pressure cylinder P2r on the variable working condition. According to the thermal power plantsteam turbine main steam flow measuring method, various factors influencing the temperature or the pressure of the regulating stage in the actual operation process are avoided, the measurement accuracy of the main steam flow is improved, and the method has important significance in economic calculation of and analysis on a thermodynamic system.

Description

technical field [0001] The invention belongs to the technical field of steam turbine main steam flow measurement, and in particular relates to a method for measuring the main steam flow of a steam turbine in a thermal power plant. Background technique [0002] The main steam flow is one of the key parameters of the generator set, and its accurate measurement is of great significance to the on-line performance monitoring, process control and operation optimization of the unit. Although it is simple and easy to operate by using a flowmeter to measure the main steam flow, the pressure loss caused by the flowmeter will increase the heat consumption of the unit, especially for the unit with high parameters and large capacity, the pressure loss cannot be ignored. Not only that, when the load of the unit changes in a large range, the measurement accuracy of the flowmeter is still far from ideal. At present, the main steam flow measuring point is canceled in the system design of th...

AI Technical Summary

Problems solved by technology

Although it is simple and easy to operate by using a flowmeter to measure the main steam flow, the pressure loss caused by the flowmeter will increase the heat consumption of the unit, especially for the unit with high parameters and large capacity, the pressure loss cannot be ignored

Not only that, when the load of the unit changes in a large range, the measurement accuracy of the flowmeter is still far from ideal

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