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System and method for online evaluation of high-temperature pressure-bearing component defect of steam turbine

A pressure-bearing component and defect assessment technology, applied in the field of steam turbines, can solve problems such as failure to meet pressure-bearing component defects, poor calculation accuracy of crack growth life, and inability to guide maintenance personnel to deal with defects, so as to eliminate potential safety hazards, prevent non-stop, The effect of ensuring operational safety

Active Publication Date: 2019-03-29
SHANGHAI POWER EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing life monitoring technology of pressure-bearing parts provides a monitoring method for the crack growth life of high-temperature pressure-bearing parts of steam turbines. However, most of these technologies adopt the method of parameter correction, and the calculation accuracy of crack growth life is poor, which cannot meet the requirements of online assessment. It cannot meet the needs of pressing parts defects, nor can it guide maintenance personnel to accurately deal with defects

Method used

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  • System and method for online evaluation of high-temperature pressure-bearing component defect of steam turbine
  • System and method for online evaluation of high-temperature pressure-bearing component defect of steam turbine
  • System and method for online evaluation of high-temperature pressure-bearing component defect of steam turbine

Examples

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Effect test

Embodiment 1

[0051] For a certain type of 600MW steam turbine high-pressure inner cylinder, the structure of the high-pressure inner cylinder is as follows Figure 4 As shown, during the service period of the 600MW steam turbine, the figure 1 the device shown, figure 2 The flow chart shown and image 3 As shown in the computer software, during the overhaul process, it is found that there is a crack with a depth of 0.5mm at part A, where the wall thickness of the inner cylinder is 320mm.

[0052] Step 1: Determine the depth ratio L of the high-pressure cylinder of the steam turbine 1 , Will L 1 The value of is entered into the database server;

[0053] Step 2: Online calculation of the maximum principal stress σ at the crack location 1 :

[0054] Using the recommended start-stop curve provided by the manufacturer and the actual start-stop curve of the power plant, establish σ 1 The mapping relationship with main steam temperature, main steam temperature and pressure, reheat steam ...

Embodiment 2

[0056] For a certain type of 660MW steam turbine high-pressure main steam valve and regulating valve casing, the structure of the high-pressure valve casing is as follows Figure 5 As shown, during the service period of the 660MW steam turbine, the figure 1 the device shown, figure 2 The flow chart shown and image 3 As shown in the computer software, during the overhaul process, it is found that there is a crack with a depth of 1mm at part C, where the wall thickness of the inner cylinder is 138mm.

[0057] Step 1: Determine the depth ratio L of the high-pressure cylinder of the steam turbine 1 , Will L 1 The value of is entered into the database server;

[0058] Step 2: Online calculation of the maximum principal stress σ at the crack location 1 :

[0059] Using the recommended start-stop curve provided by the manufacturer and the actual start-stop curve of the power plant, establish σ 1 The mapping relationship with main steam temperature, main steam temperature a...

Embodiment 3

[0066] For a certain type of 350MW steam turbine thin-walled medium-pressure inner cylinder, the structure of the medium-pressure inner cylinder is as follows Figure 6 As shown, during the service period of the 350MW steam turbine, the figure 1 the device shown, figure 2 The flow chart shown and image 3 As shown in the computer software, during the overhaul process, it is found that there is a crack with a depth of 1.7mm at part E, where the wall thickness of the inner cylinder is 88.5mm.

[0067] Step 1: Determine the depth ratio L of the high-pressure cylinder of the steam turbine 1 , Will L 1 The value of is entered into the database server;

[0068] Step 2: Online calculation of the maximum principal stress σ at the crack location 1 :

[0069] Using the recommended start-stop curve provided by the manufacturer and the actual start-stop curve of the power plant, establish σ 1 The mapping relationship between main steam temperature and pressure, reheat steam temp...

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Abstract

The invention provides a system and a method for online evaluation of high-temperature pressure-bearing component defect of a steam turbine. The method comprises the steps of firstly determining a crack part and a depth ratio of a high-temperature pressure-bearing component of the steam turbine, establishing a mapping relation between a highest main stress and a thermal parameter at a component with a crack, then performing on-line real-time calculation on the highest main stress of the part with the crack, determining whether crack expansion life calculation is required, if yes, performing real-time calculation for obtaining the crack expansion depth of the pressure-bearing component, and recommending operation and maintenance suggestions according to different crack depth ratios. According to the system and the method, the specific structure of the crack component is considered, and online evaluation for the pressure-bearing component defect is realized. The operation state of the high-temperature pressure-bearing component of the steam turbine can be accurately mastered in real time, and a basis is supplied for state maintenance of the high-temperature pressure-bearing componentof the steam turbine. If the crack depth is overlarge, the potential safety hazards of the steam turbine are eliminated through arranging heavy maintenance or medium maintenance in time, thereby realizing effects of preventing steam turbine stoppage and ensuring high operation safety of the steam turbine.

Description

technical field [0001] The invention relates to a system and method for online defect evaluation of high-temperature pressure-bearing components of a steam turbine, belonging to the technical field of steam turbines. Background technique [0002] The high-temperature and pressure-bearing parts of the steam turbine include high-pressure and medium-pressure valve casings, high-pressure and medium-pressure inner cylinders, etc. These components are subjected to high temperature and high pressure, and the working conditions are extremely harsh. High-temperature pressure-bearing parts are generally castings with many manufacturing defects, and defects such as cracks are often found after commissioning. In addition, in recent years, due to the blind pursuit of economy in power plants, the steam temperature changes too quickly during the start-up and stop of the unit, and high-temperature pressure-bearing components such as valve casings and inner cylinders often suffer from cracks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/00G01B21/18G06Q10/00
CPCG01B21/00G01B21/18G06Q10/20
Inventor 邓志成史进渊范佳卿徐佳敏郭荣汪勇陈荣泽臧剑南孙猛
Owner SHANGHAI POWER EQUIP RES INST
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