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Turbine sequence valve load abrupt fault diagnosis method based on high control valve switch test

A load mutation and fault diagnosis technology, 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., to ensure safety and large-scale practical application value effect

Active Publication Date: 2015-02-04
HARBIN INST OF TECH
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  • 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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  • Turbine sequence valve load abrupt fault diagnosis method based on high control valve switch test
  • Turbine sequence valve load abrupt fault diagnosis method based on high control valve switch test
  • Turbine sequence valve load abrupt fault diagnosis method based on high control valve 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 turbine sequence valve load abrupt fault diagnosis method based on a high control valve switch test is disclosed. The invention relates to a diagnosis method of a turbine load abrupt fault in a thermal power unit sequence valve operation mode and aims to solve the problem of unit load sudden decrease caused by software and hardware faults of an existing method. The method comprises the steps of (1) switching an operation mode to a single valve from a sequence valve, (2) through an instruction of manually reducing the main steam pressure of a unit and increasing the comprehensive valve of the unit, determining whether a fault reason is related to software or hardware, (3) through checking whether a load sudden change phenomenon appears or not in a test process and observing the valve rod motion of a unit high control valve, diagnosing the fault further, and determining whether system jam and valve off faults exist, (4) according to the Friuli Greig formula, carrying out the flow characteristic calculation of a high control valve by using test data, extracting fault characteristics and determining whether the high control valve has a connection looseness fault. The turbine sequence valve load abrupt fault diagnosis method is applied to the field of 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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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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