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Method for fast detecting plugging degree of oxide skins on inner wall of austenitic stainless steel tubes

A technology of austenitic stainless steel and detection method, applied in the direction of measuring device, geophysical measurement, radio wave measurement system, etc., can solve the problems of cumbersome implementation, impossibility of completion, heavy on-site construction workload, etc., and achieve simple and convenient data collection method, The effect of stable measurement data and simple data processing

Active Publication Date: 2014-05-07
NORTHEAST POWER SCI RES INSTITUTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former radiographic flaw detection is limited by the layout space of the boiler’s high-temperature heating surface, the filming effect is not good, the on-site construction workload is large, and the radiographic flaw detection method affects other boiler maintenance work, and cannot meet the boiler maintenance schedule requirements; the latter method is implemented too much. It is cumbersome, requires an additional power supply, and requires a long connecting wire, which is not conducive to the inspection of the heating surface of large boilers. It has high requirements for the setting of a stable and constant magnetic field strength. Affected by the actual detection environment, the detection data fluctuates greatly, and it is impossible to complete on-site fast, Detection requirements for accurate positioning

Method used

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  • Method for fast detecting plugging degree of oxide skins on inner wall of austenitic stainless steel tubes

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] One elbow of the high-temperature reheater was tested, and the A1 value was 28 A / m, which was less than 10% of M, so it was judged that there was no oxide scale accumulation in the elbow.

example 2

[0029] Test one elbow of the high-temperature reheater, the A1 value is 98A / m, greater than 40 A / m, and less than 120 A / m, judging that there may be scale accumulation in this section of the elbow, continue to measure A2 to 100 A / m, A3 A / m is 110 A / m, A4 is 90 A / m, A2, A3, A4 are all less than 120 A / m, but (A2+A3+A4) / 3 is 120 A / m greater than 80 A / m, judge this section of the bend The tube has scale buildup.

example 3

[0031] One elbow of the high-temperature reheater was tested, and the A1 value was 158A / m. It was judged that there was scale accumulation in this elbow.

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Abstract

The invention belongs to the technical field of check and maintenance of the high-temperature heated surface of a boiler in the electric industry and particularly relates to a method for fast detecting the plugging degree of oxide skins on the inner wall of austenitic stainless steel tubes. The method is suitable for fast detecting the plugging degree of oxide skins on the inner wall of austenitic stainless steel tubes, achieves the purpose of fast detecting the plugging condition of oxide skins on the inner wall of austenitic stainless steel tubes through an MF500M magnetic detector, is not limited by field detection space or field detection environment, is not needed to be externally connected with a power supply or additionally provided with a steady magnetic field, has the remarkable advantages of being stable in measured data, high in accuracy and simple and convenient in data processing, and is especially suitable for fast check of plugging of the oxide skins on the inner wall of austenitic stainless steel tubes. In addition, the method is strong in practicality and pertinence and has good application value.

Description

technical field [0001] The invention belongs to the technical field of inspection and maintenance of high-temperature heating surfaces of boilers in the electric power industry, and in particular relates to a rapid detection method for the clogging degree of scale on the inner wall of austenitic stainless steel pipes, which is suitable for quickly detecting the clogging degree of scale on the inner walls of austenitic stainless steel pipes . Background technique [0002] In recent years, austenitic stainless steel tubes are widely used on the high-temperature heating surfaces of boilers of large supercritical and ultra-supercritical coal-fired units. Although such steel tubes have good high-temperature performance and welding performance, an oxide film on the inner wall is inevitable during the operation of the boiler. , this kind of oxide film will fall off due to the difference between the thermal expansion coefficient and the steel pipe during the start-up and shutdown o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/00
Inventor 陈凯张超群姜兴运赵海田成川徐昀周闯孟宇
Owner NORTHEAST POWER SCI RES INSTITUTION
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