Online monitoring method for exhaust steam dryness of low-pressure cylinder of steam turbine

Abstract

The invention discloses an online monitoring method for the exhaust steam dryness of a low-pressure cylinder of a steam turbine. According to the method, an online monitoring system for the exhaust steam dryness of the low-pressure cylinder of the steam turbine is adopted for carrying out monitoring; in the system, exhaust steam of the low-pressure cylinder of the steam turbine is extracted by a throat of a condenser, enters the condenser through a gas-side inlet of the condenser, and then is discharged to the atmosphere by a gas-side outlet of the condenser and a vacuum pump; a refrigerant inlet and a refrigerant outlet of the condenser are connected with an outlet and an inlet of a refrigerating machine respectively; a drain opening of the condenser is connected with a hot well of the condenser through a drain pipeline; and sensors are correspondingly arranged at the gas-side inlet, the gas-side outlet and the drain opening of the condenser. According to the online monitoring methodfor the exhaust steam dryness of the low-pressure cylinder of the steam turbine, the calculation process is simple, and complex iterative calculation is not needed, so that the online monitoring method is more suitable for online monitoring; and the pressure, the temperature, the flow rate and the humidity of a medium are only required to be measured in the monitoring process, and the obtaining method of the parameters is mature and reliable, so that the relatively accurate parameters can be obtained, and the obtaining cost is relatively low.

Description

Technical field: [0001] The invention relates to an on-line monitoring method for the dryness of exhaust steam of a low-pressure cylinder of a steam turbine. Background technique: [0002] Since the 1980s, my country has introduced foreign large-scale steam turbine units. In the initial long period of time, due to the expensive equipment and the limited operation level of the unit, the power plant technicians were mainly concerned about the safety of the equipment, and less concerned about the economy of the unit. At the end of the 1990s, with the continuous improvement of the operation level of the units, the domestic power plants gradually took improving the economy of the units as one of the key points of work while running safely and stably. to maturity. Based on the collection and calculation of real-time operating data, this system analyzes the parts that generate energy loss, so as to guide the optimal operation and maintenance of the unit to achieve the purpose of ...

AI Technical Summary

Problems solved by technology

For example, the energy balance method is not only based on the flow measurement parameters, but also requires a new comprehensive complex calculation almost every time it is used. The calculation process is complex, the workload is heavy, and the calculation cycle is long; the equivalent enthalpy drop method is not suitable for large load changes. Working conditions; the calculation accuracy of the curve extrapolation method is poor, especially at low loads; the Fleuger formula method is not suitable for the working conditions where the area of ​​the steam passage changes, and the reference flow, pressure and temperature are not easy to determine accurately, etc.

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