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On-line Monitoring Method of Exhaust Steam Dryness of Low Pressure Cylinder of Steam Turbine

A low-pressure cylinder and steam turbine technology, which is applied in the field of on-line monitoring of the exhaust steam dryness of the low-pressure cylinder of a steam turbine, can solve the problems such as the difficulty of accurately determining the reference flow, pressure and temperature, poor calculation accuracy of the curve extrapolation method, and complicated calculation process.

Active Publication Date: 2020-04-03
GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • On-line Monitoring Method of Exhaust Steam Dryness of Low Pressure Cylinder of Steam Turbine
  • On-line Monitoring Method of Exhaust Steam Dryness of Low Pressure Cylinder of Steam Turbine
  • On-line Monitoring Method of Exhaust Steam Dryness of Low Pressure Cylinder of Steam Turbine

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Experimental program
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Effect test

Embodiment 1

[0081] Such as figure 1 As shown, the steam turbine low-pressure cylinder exhaust steam dryness online monitoring method of the present invention, the monitoring system adopted in the method includes a condenser 7, a vacuum pump 8 and a refrigerator 3, and the steam turbine low-pressure cylinder exhaust steam is extracted by the condenser throat 16. The gas side inlet of the condenser 7 enters the condenser 7, and then the gas side outlet of the condenser 7 and the vacuum pump 8 are discharged to the atmosphere through the vacuum pump exhaust pipeline 9; the cooling medium in the condenser 7 comes from the refrigerator 3, the condenser 7 The refrigerant inlet and refrigerant outlet are respectively connected to the outlet and inlet of the refrigerator 3. The refrigerant produced by the refrigerator 3 enters the condenser 7 through the refrigerant outlet pipeline, and returns to the refrigerator 3 through the refrigerant inlet pipeline after absorbing heat in the condenser 7. R...

Embodiment 2

[0138] The selected design of this embodiment lies in: since the cross-sectional area of ​​the exhaust port of the low-pressure cylinder of the steam turbine is large, the flow field is a non-uniform flow field, so it is difficult to reflect the real exhaust dryness only through one steam extraction pipeline. Therefore, there are multiple steam extraction pipelines between the condenser and the condenser in this embodiment. They are all inclined at an angle of 30° to 60°.

[0139] In this embodiment, the number of steam extraction pipelines can be determined according to the cross-sectional area of ​​the condenser throat 16, and generally can be controlled at 1.5m 2 ~3m 2 Arrange a steam extraction pipeline. In principle, the more steam extraction pipelines are arranged at the throat 16 of the condenser, the more accurate the dryness of exhaust steam from the low-pressure cylinder of the steam turbine will be. However, too many steam extraction pipelines will increase the equ...

Embodiment 3

[0141] The selection design of this embodiment is: in this embodiment, the number of multi-way steam extraction pipelines is 4, such as Figure 4 As shown, the suction ports of the 4-way extraction pipelines are respectively inserted from the periphery (middle) of the condenser throat 16, the lengths of the 4-way insertions are equivalent, and the inclination angles to the horizontal plane are all 45°. The 4 steam extraction pipelines are combined into a steam extraction main pipe and then monitored by a monitoring system.

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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 exhaust steam quality of a low-pressure cylinder of a steam turbine. Background technique: [0002] my country began to introduce foreign large-scale steam turbines in the 1980s. For a long period of time at the beginning, due to the expensive equipment and the limited operating level of the unit, the technicians of the power plant mainly cared about the safety of the equipment, and paid less attention to the economy of the unit. In the late 1990s, with the continuous improvement of the operation level of the unit, domestic power plants gradually took improving the economic efficiency of the unit as one of the priorities while operating safely and stably. It was during this period that the online diagnosis system for steam turbines developed and gradually became Yu mature. Based on the collection and calculation of real-time operation data, this system analyzes the parts that generate energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/14G01N33/00
CPCG01M15/14G01N33/0004
Inventor 杨文正杨希刚马晓峰谭锐邵峰徐星殷戈于强李呈桐
Owner GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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