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Non-destructive testing method for oxide accumulation state of inner wall of austenitic boiler steel tube of utility boiler

A technology for boiler steel pipes and power plant boilers, applied in the direction of material magnetic variables, etc., can solve problems such as detection signal exceeding the standard, outer wall oxidation, stainless steel pipe influence, etc., achieve high accuracy, tight time, and avoid the effects of blocking and bursting pipes

Active Publication Date: 2013-04-10
XIANGTAN HONGDA ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, another detection device based on the principle of electromagnetic or Hall effect or eddy current detection can roughly detect the accumulation of oxides in the tube, but in operation, due to the relationship between the direction of the flue gas flow, there are actually differences in different directions of the stainless steel tube. The outer wall is oxidized to a certain extent, and the manufacturing process will also affect the stainless steel pipe
If the influence of the operation or manufacturing process on the oxide layer on the outer wall and the inner wall of the tube is not considered, it is easy to cause the detection signal to exceed the standard in the actual operation process, but the misjudgment of the oxide is not found after cutting the tube, which seriously affects the detection. accuracy of results

Method used

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  • Non-destructive testing method for oxide accumulation state of inner wall of austenitic boiler steel tube of utility boiler
  • Non-destructive testing method for oxide accumulation state of inner wall of austenitic boiler steel tube of utility boiler
  • Non-destructive testing method for oxide accumulation state of inner wall of austenitic boiler steel tube of utility boiler

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Experimental program
Comparison scheme
Effect test

Embodiment

[0021] 1. Take a new tube with the same specifications as the high temperature heating surface of the boiler as sample tube 1. For example, the TP347H straight pipe with a typical commonly used specification of Φ45×7.8mm, and adding oxide 2 to block the 6 states of the cross-sectional area of ​​the pipe respectively: 1 / 6, 1 / 3, 1 / 2, 2 / 3, 5 / 6, full full.

[0022] 2. Measure and record the initial value H0 of the magnetic intensity equivalent of the sample tube 1 with a measuring device using the principle of electromagnetic conversion. The measurement process is as follows:

[0023] (1) Clear the signal before the U-shaped probe touches the steel pipe;

[0024] (2) Divide the sample tube into 4 equal parts (lower arc surface n1, left arc surface n2, right arc surface n3, upper arc surface n4) along the cross-sectional direction and mark them. The measurement points are as follows: figure 1 shown;

[0025] (3) The curved surface of the straight rod or U-shaped probe is in cont...

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Abstract

The invention discloses a non-destructive testing method for an oxide accumulation state of an inner wall of an austenitic boiler steel tube of a utility boiler. The testing method has the following technical effects that the oxide accumulation state of the inner wall of the austenitic boiler steel tube of the partially oxidized utility boiler can be tested quickly, sensitively, accurately, safely and nondestructively, thousands of stainless steel tubes of the boiler can all be tested in one or two days, the higher accuracy is ensured, requirements that overhaul time required by a power plant is short, and the inspection needs to be accurate and comprehensive are met, tube cutting is conducted on an elbow seriously blocked by oxide under scientific guidance, and bursting of the tube caused by blockage is avoided.

Description

technical field [0001] The invention relates to a method for detecting oxygen accumulation on the inner wall of a stainless steel tube of a power station boiler. Background technique [0002] Because austenitic stainless steel has 700-degree high-temperature durable strength, good processing performance and weldability, austenitic stainless steel is widely used in the high-temperature heating surface parts of boilers of ultra-(ultra)critical thermal power units. However, the oxidation resistance of coarse-grained austenitic stainless steel pipes is often poor. During the long-term high-temperature and high-pressure operation of power plant boilers, oxides are easily formed on the inner wall of austenitic stainless steel pipes, and because of the oxidation of the stainless steel pipe matrix and inner walls The thermal expansion coefficients of the materials differ greatly, so the generated inner wall oxides are easy to fall off from the substrate during the shutdown process o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83G01N27/85
Inventor 彭欣覃波
Owner XIANGTAN HONGDA ELECTRONICS TECH CO LTD
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