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A monitoring method for local thermal stress non-uniformity of steam turbine rotor under low load condition

A steam turbine, thermal stress technology, applied in mechanical equipment, engine control, engine function, etc., can solve problems such as uneven thermal stress

Active Publication Date: 2020-08-21
HARBIN INST OF TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the problem that the traditional steam turbine rotor thermal stress monitoring method is difficult to reflect the non-uniformity of the local thermal stress of the rotor under low-load conditions; especially for ignoring the non-uniformity of the rotor circumferential thermal stress under this working condition problem, the present invention provides a method for monitoring the unevenness of local thermal stress of the rotor in the low load condition of the steam turbine

Method used

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  • A monitoring method for local thermal stress non-uniformity of steam turbine rotor under low load condition
  • A monitoring method for local thermal stress non-uniformity of steam turbine rotor under low load condition
  • A monitoring method for local thermal stress non-uniformity of steam turbine rotor under low load condition

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specific Embodiment approach 1

[0031] Specific implementation mode one: see figure 1 Describe this embodiment, a method for monitoring the non-uniformity of thermal stress in the rotor under the low-load condition of a steam turbine described in this embodiment, the method includes the following steps:

[0032] Step 1. Arranging m steam temperature sensors and n steam pressure sensors evenly in the circumferential direction on the cylinder block after the adjustment stage of the steam turbine unit; where m and n are integers,

[0033] Step 2. Define and characterize the average circumferential temperature and pressure average

[0034]

[0035]

[0036] T i Indicates the steam temperature detected by the i-th steam temperature sensor, T j Indicates the steam pressure detected by the jth steam pressure sensor, i and j are both positive numbers;

[0037] Step 3, the control system of the steam turbine unit according to T i , T j , average temperature and pressure average get σ i and τ i , ...

specific Embodiment approach 2

[0044] Specific implementation mode two: see figure 1This embodiment is described. The difference between this embodiment and the method for monitoring the non-uniformity of thermal stress in the rotor under low-load conditions of a steam turbine described in Embodiment 1 is that the value range of n is n≥2.

[0045] In this embodiment, figure 2 Among them, measuring points A and C are the measuring points of steam temperature after adjustment: both inner and outer cylinders are drilled through, and the thermocouple is fixed with a sleeve. The pipe is led out and connected to the pressure transmitter.

[0046] The optimized layout of measuring points can add temperature and pressure measuring points according to the existing position. The installation position of the measuring points adopts the principle of axisymmetric distribution of measuring points of the same parameter, and the number of measuring points is increased from the original to 8, such as image 3 shown. Amo...

specific Embodiment approach 3

[0047] Specific implementation mode three: see figure 1 This embodiment is described. The difference between this embodiment and the method for monitoring the local thermal stress non-uniformity of the rotor under the low-load condition of a steam turbine described in Embodiment 1 is that the value range of m is m≥2.

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Abstract

The invention relates to a rotor local thermal stress unevenness monitoring method of a steam turbine in a low load working condition, belongs to the thermotechnical field of a power plant, and solvesthe problem that conventional steam turbine rotor thermal stress monitoring means are difficult to reflect the unevenness of rotor local thermal stress in the low load working condition, in particular the problem of unevenness of the circumferential thermal stress of the rotor in the working condition. The method comprises the following steps: S1, circumferentially and uniformly arranging m steamtemperature sensors and n steam pressure sensors on a cylinder of a regulating stage of a steam turbine unit; S2, defining representative circumferential temperature mean value formula and pressure mean value formula (refer to the Specification); and S3, acquiring sigmai and taui by a steam turbine unit control system according to Ti, Tj and the temperature mean value formula and the pressure mean value formula (refer to the Specification), and displaying the acquired sigmai and taui by the steam turbine unit control system through a display so as to monitor the local thermal stress of the rotor of the unit.

Description

technical field [0001] The invention relates to a method for monitoring thermal stress of a steam turbine rotor in a low-load working condition, and belongs to the technical field of thermal engineering of a power plant. Background technique [0002] With the continuous improvement of power grid's requirements for thermal power unit peak regulation performance, thermal power unit peak regulation performance is developing in the direction of deep peak regulation (deep regulation), rapid peak regulation (fast regulation) and precise regulation (fine regulation). Deep adjustment means that the unit will operate at low load. In order to ensure the economy of the unit, the operation mode under low load is more of a sequential valve adjustment method. In the sequence valve mode, one or two valves are partially open, and the other valves are fully open (or fully closed). The uneven steam intake mode under this low-load sequence valve adjustment mode causes the rotor to withstand mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D21/14
CPCF01D21/003F01D21/14F05D2260/941F05D2270/301F05D2270/303
Inventor 万杰姚坤董恩伏邹月明隋玉秋葛维春王家卫楚豫川罗桓桓周桂平纪成龙马一菱耿莉娜戴黎王力吴南
Owner HARBIN INST OF TECH
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