Diagnosis method for through-flow stage efficiency abnormality of steam turbine high-pressure cylinder

A diagnostic method and steam turbine technology, which are applied in gas turbine engine testing, jet engine testing, etc., can solve problems such as abnormal measured flow stage efficiency, abnormal measured flow parameters, and unmentioned problems.

Active Publication Date: 2017-06-30
XIAN THERMAL POWER RES INST CO LTD
View PDF8 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, there are two cases of abnormal efficiency of the flow stage of the high pressure cylinder of the steam turbine: (1) The efficiency of the flow stage of the high pressure cylinder is really low due to design or manufacturing defects
(2) There is high-quality steam leakage inside the high-pressure cylinder to the steam extraction pipe or the throttling phenomenon in the extraction chamber, which leads to abnormal flow parameters and abnormal efficiency of the measured flow stage.
Domestic steam turbine equipment performance acceptance test or overhaul test has relevant test standard references (such as PTC62004 and GB / T 8117), and the test standards or regulations are for the operation process of the steam turbine performance test, the type and quantity of measuring points required for the test, and the accuracy of the test instrument Detailed requirements were made, but none of them mentioned the relevant methods of steam turbine fault diagnosis and analysis such as the abnormal efficiency of the flow stage of the high-pressure cylinder

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Diagnosis method for through-flow stage efficiency abnormality of steam turbine high-pressure cylinder
  • Diagnosis method for through-flow stage efficiency abnormality of steam turbine high-pressure cylinder
  • Diagnosis method for through-flow stage efficiency abnormality of steam turbine high-pressure cylinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Such as figure 1 As shown, when the unit has not been put into operation, refer to the ASME PTC6 standard, install temperature and pressure test measuring points on the inlet steam, exhaust steam and each section of the steam extraction pipeline of the high pressure cylinder of the steam turbine, the pressure measuring point is installed upstream, and the pressure measurement adopts The pressure transmitter with an accuracy of 0.075, the temperature measuring point is arranged with double measuring points, the precision grade E-type thermocouple for the test is the primary measuring element, the secondary instrument is measured by the temperature transmitter, and the acquisition system adopts the EIC distributed data acquisition device Combined with the IMP data acquisition board produced by Schlumberger in the UK, the pressure and temperature signals ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a diagnosis method for through-flow stage efficiency abnormality of a steam turbine high-pressure cylinder. The invention studies how to diagnose the cause of abnormal through-flow parameters of a high-pressure cylinder. According to the scheme, the method comprises the following steps: first, testing the influence of temperature change of inlet steam on the through-flow stage efficiency of a high-pressure cylinder, and judging whether there is a steam leakage phenomenon inside the high-pressure cylinder according to the linear trend of expansion of steam in a steam turbine; then, closing the electric doors of extraction steam in all sections of the high-pressure cylinder, measuring the pressure and temperature of inlet steam, exhaust steam and extraction steam in all sections, calculating the ratio of extraction steam pressure to after-stage flow under variable conditions, comparing the extraction steam pressure with the pressure after corresponding through-flow stage; and finally, determining the cause of through-flow stage efficiency abnormality of the high-pressure cylinder. The cause of through-flow stage efficiency abnormality of a steam turbine high-pressure cylinder is diagnosed according to boundary conditions by making use of the expansion characteristics of superheated steam in the steam turbine and the flow characteristics of superheated steam in the channel. The invention fills a technology gap in diagnosis of through-flow stage efficiency abnormality of a steam turbine high-pressure cylinder in our country.

Description

Technical field: [0001] The invention belongs to the field of thermal power generation, and in particular relates to a method for diagnosing abnormal efficiency of a flow-through stage of a high-pressure cylinder of a steam turbine. Background technique: [0002] In the field of thermal power generation, steam turbines are one of the key equipment for converting steam heat energy into electric energy. The development route of domestic steam turbines is "introduced products-introduced technology-independent production of some equipment-completely independent production-independent development of innovative products". With the improvement of the design and manufacturing level, the performance of some products produced and developed by domestic steam turbine manufacturers has approached the world-class level, but there are still many problems in some models of steam turbines, such as the abnormal efficiency of the flow stage of the high-pressure cylinder of the steam turbine (lo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/14
CPCG01M15/14
Inventor 裴东升付昶王伟锋吴涛文乐
Owner XIAN THERMAL POWER RES INST CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products