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Fault Diagnosis Method for Turbine Sequence Valve Load Sudden Change Based on High-Tune Door Switch Test

A technology for sudden change in load and fault diagnosis, which is applied in engine testing, machine/structural component testing, measuring devices, etc., can solve problems such as unit load sudden drop, software and hardware failures, etc. effect of value

Active Publication Date: 2017-01-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of unit load sudden drop caused by the failure of software and hardware in the existing method, and provides a fault diagnosis method for sudden change of load of steam turbine sequence valve based on high-profile door switch test

Method used

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  • Fault Diagnosis Method for Turbine Sequence Valve Load Sudden Change Based on High-Tune Door Switch Test
  • Fault Diagnosis Method for Turbine Sequence Valve Load Sudden Change Based on High-Tune Door Switch Test
  • Fault Diagnosis Method for Turbine Sequence Valve Load Sudden Change Based on High-Tune Door Switch Test

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specific Embodiment approach 1

[0034] Specific implementation mode one: as figure 1 As shown, it is the specific process of this embodiment: the fault diagnosis method for the sudden change of load of the steam turbine sequence valve based on the high-profile door switch test is realized in the following steps:

[0035] Step 1: When the unit is in load operation state, switch the operation mode from sequence valve to single valve, and increase the unit load to 90% to 95%;

[0036] Step 2: Release the unit coordination control and automatic sliding pressure operation control. On the basis of keeping the unit load basically unchanged, manually reduce the main steam pressure of the unit and increase the comprehensive valve position command of the unit at the same time, so that the four units of the unit When the high-pressure regulating valve reaches the fully open state, when the high-pressure regulating valve of the unit changes in a large range, the load change of the unit is within the range required by th...

specific Embodiment approach 2

[0049] Embodiment 2: This embodiment differs from Embodiment 1 in that: the range required by the operating regulations in step 2 cannot exceed the rated load of the unit, nor can it be lower than the minimum load for maintaining stable combustion of the unit boiler.

[0050] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0051] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the abrupt change phenomenon in step 2 means that if the unit load drops by 5MW-40MW instantaneously, it is determined that the unit has a sudden load failure.

[0052] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

A method for diagnosing a sudden change in load of a steam turbine sequence valve based on a high-profile door switch test. The invention aims to solve the problem of sudden load drop of the unit caused by software and hardware faults in the existing method. Step 1: Switch the operation mode from sequence valve to single valve; Step 2: Decrease the main steam pressure of the unit manually and increase the comprehensive valve position command of the unit at the same time to determine whether the cause of the fault is in software or hardware; Step 3 : Through whether there is a sudden change in load during the test and observing the action of the valve stem of the high-profile door of the unit, further diagnose the fault, and determine whether there is a fault of system jamming and valve head falling off; Step 4: Use the test data according to the Fruger formula Calculate the flow characteristics of the high-profile door, extract the fault features, and determine whether there is a loose connection fault for the specific high-profile door. The invention is applied in the field of steam turbine fault diagnosis.

Description

technical field [0001] The invention relates to a method for diagnosing a sudden change in load of a steam turbine under the operating mode of a sequence valve of a thermal power unit, in particular to a method for diagnosing a sudden change in load of a sequence valve of a steam turbine based on a high-profile door switch test. Background technique [0002] At present, with the continuous increase of power demand in our country, the electric power industry has developed rapidly, and the replacement of small-capacity units by large-capacity units is increasing. running. In order to reduce the larger throttling loss in the single valve mode under low load conditions, the unit generally operates in the sequential valve mode to improve the low-load operation economy of the unit. However, many large-scale thermal power generation steam turbines often have sudden load failures when they operate in the sequential valve mode, which seriously affects the safe and efficient operatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/00
Inventor 万杰孙建国唐海峰李东平王勇祁海旺王新波郝东波江飞邹铁军刘金福于达仁
Owner HARBIN INST OF TECH
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