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On-line monitoring method for variation of through-flow gap of steam turbine

A steam turbine and clearance technology, which is used in mechanical clearance measurement, engine testing, and machine/structural component testing. accurate effect

Inactive Publication Date: 2007-04-25
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not conducive to the early detection and timely treatment of the change of the flow clearance of the steam turbine

Method used

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  • On-line monitoring method for variation of through-flow gap of steam turbine
  • On-line monitoring method for variation of through-flow gap of steam turbine
  • On-line monitoring method for variation of through-flow gap of steam turbine

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Experimental program
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Embodiment Construction

[0031] The specific implementation steps and calculation methods of the present invention will be further described below in conjunction with the accompanying drawings. It can be seen from Fig. 1 that the on-line monitoring method for the flow gap change of the steam turbine provided by the present invention mainly consists of the following links.

[0032] a. Data collection link: This link mainly calculates the pressure ratio before and after each stage group of the steam turbine, the relative internal efficiency of the stage group and the heat consumption rate of the steam turbine based on the data from the data acquisition system.

[0033] The present invention needs to monitor the parameter list

[0034] Generator end power (KW)

Water pressure at the outlet of feed water pump A (MPa)

Generator power factor (%)

Water temperature at outlet of feed water pump A (℃)

Main condensate flow (t / h)

Inlet steam pressure of small steam turbine B (MPa)

...

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Abstract

An on-line monitoring method for the changing circulatation gap of the steam turbine is disclosed that comprises the steps: acquiring data, calculating the flux of the main steam, correcting parameters of the regenerative system, correcting the primary parameter and the end parameter, designing the parameter fitting in operating mode and diagnosing the augment of circulating gap. The main steam flux of the steam turbine can be obtained by computer from the main steam temperature and pressure of the main steam, the regenerative steam temperature and pressure, the vacuum condenser, the temperature and pressure in each of the regenerative exhaust points, the water temperature of the ports, the drain temperature and the water flux of condensate, the flux value of the cooling water of the superheater and the reheater when the steam turbine is running. Based on the heat balance diagram in the operating mode of the steam turbine, the temperature, pressure and the internal efficiency ratio of the regenerative ports in the condition of the main steam are contrasted with the real temperature, pressure and the internal efficiency ratio of the regenerative ports to realize the on-line monitoring for the changing circulatation gap of the steam turbine. The method is scientific to realize the automatical on-line monitoring and exact fault diagnosis.

Description

Technical field [0001] The invention relates to the field of thermal equipment state monitoring and fault diagnosis, and is an online monitoring method for the flow gap change of a steam turbine. Background technique [0002] With the increasing peak-valley difference of the power grid, large generating units are forced to participate in peak-shaving operation. In the process of frequent start and stop of the unit or variable load, due to the difference in the expansion degree of the rotating part and the static part of the steam turbine, the rotating part and the static part of the steam turbine will be rubbed, resulting in damage to the steam seal of the steam turbine flow part, which causes the flow gap of the steam turbine to increase. Big. In addition, due to changes in the heating conditions of the cylinder itself during operation, the deformation of the cylinder will also cause the turbine flow gap to increase. The increase in the flow gap of the steam turbine seriously af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B5/14G01M15/00G01K17/00
Inventor 李勇张毅曹丽华张爱萍周振起金建国张炳文
Owner NORTHEAST DIANLI UNIVERSITY
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