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On-line prediction method for tension fracture of water cooling wall of boiler

A forecasting method and water-cooled wall technology, applied in forecasting, instrumentation, electrical digital data processing, etc., can solve the problems of inaccurate calculation results, difficult to obtain data, and many calculation formulas, so as to reduce the risk of unplanned downtime of boilers and reduce power generation. Effects of losses and labor costs

Pending Publication Date: 2021-12-24
HUADIAN LAIZHOU POWER GENERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned patent calculates the alternating stress of the pipe based on the operating principle and design parameters of the boiler, which requires a large amount of design and operation data, which are difficult to obtain in practical applications.
Moreover, there are many calculation formulas for boiler hydrodynamics, the calculation results are inaccurate, and it depends on foreign calculation software.

Method used

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  • On-line prediction method for tension fracture of water cooling wall of boiler
  • On-line prediction method for tension fracture of water cooling wall of boiler
  • On-line prediction method for tension fracture of water cooling wall of boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Such as figure 1 As shown, an online prediction method for boiler water wall cracking includes the following steps:

[0073] Step 1. Divide the water wall into N areas, numbered SA1~SAN;

[0074] Step 2, collect the historical data of the wall temperature of the water-cooled wall, and conduct a preliminary screening of the data;

[0075] Step 3, performing data cleaning on the historical data of the wall temperature of the water-cooled wall obtained in step 2;

[0076] Step 4, extracting the warning database from the wall temperature data obtained in step 3;

[0077] Step 5, constructing the water wall cracking model database;

[0078] Step 6. Construct the learning model of water wall cracking;

[0079] Step 7. Predict whether there is a risk of cracking in the water wall tube.

[0080] Step 1. Divide the water wall into N areas, numbered SA1~SAN;

[0081] The division principle of the area can be divided according to the heat load on the wall and the degree of f...

Embodiment 2

[0120] Now introduce a certain actual working condition:

[0121] Step 1. Divide the water wall into N areas and number them. The boiler of unit 1# in a certain power plant is a counter-firing boiler, and the water wall area of ​​the boiler is divided into figure 1 The method is divided into 8 areas SA1~SA8.

[0122] Step 2, collect the historical data of wall temperature measurement of the water-cooled wall, and perform preliminary screening of the data. Search the operation and maintenance records of a power plant. The latest three water-cooled wall thickness measurement data are April 29, 2021, November 5, 2020, and April 22, 2020. Read the wall temperature data of the water-cooled wall from April 22, 2020 to April 29, 2021 from the SIS system of the power plant. There are 286 measuring point data on the water wall of the power plant, which are divided into 8 groups according to the area division method in step 1. The measuring points in the SA1~SA8 area are 56, 53, 23, ...

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Abstract

The invention belongs to the field of application of coal-fired boilers, and particularly relates to a boiler water-cooled wall tension fracture online prediction method which comprises the following steps: dividing a water-cooled wall into N areas, and numbering the N areas as SA1-SAN; historical data of the wall temperature of the water cooling wall are collected, and data preliminary screening is conducted; performing data cleaning on the obtained historical data of the wall temperature of the water-cooled wall; extracting a warning database from the obtained wall temperature data; constructing a water-cooled wall tension fracture model database; constructing a water-cooled wall tension crack learning model; and predicting whether the water-cooled wall tube has the risk of tension fracture or not. The invention provides the system and the method for realizing online prediction of the pull crack of the water-cooled wall of the boiler during the operation period of the boiler, the pull crack fault of the water-cooled wall can be judged in advance, and the risk of non-planned shutdown of the boiler is reduced.

Description

technical field [0001] The invention belongs to the application field of coal-fired boilers, and in particular relates to an online prediction method for cracking of water-cooled walls of boilers. Background technique [0002] The cracking and deformation of the water-cooled wall of the coal-fired boiler of the thermal power unit are very common. The main reason is that the uneven temperature distribution of the water-cooled wall produces a large stress, which leads to cracks in the water-cooled wall starting from the fins, extending to the pipe, until cracking and leakage ; Second, under the flexible operation requirements of thermal power units, the wall temperature of the water-cooled wall continues to fluctuate violently at low loads, resulting in thermal fatigue of the water-cooled wall tubes under the action of alternating stress, resulting in transverse cracks and even leakage. [0003] At present, there is no mature online prediction method for boiler water wall crac...

Claims

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Application Information

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IPC IPC(8): G06F30/27G06Q10/04G06F113/14G06F119/08G06F119/14
CPCG06F30/27G06Q10/04G06F2119/08G06F2119/14G06F2113/14
Inventor 杨栋马记曹子飞王友龙周练达邢路平
Owner HUADIAN LAIZHOU POWER GENERATION
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