Method for detecting microcrack of high temperature furnace inner wall of furnace and device therefor

A micro-crack, high-temperature furnace technology, applied in measuring devices, using sonic/ultrasonic/infrasonic waves to analyze solids, instruments, etc., can solve the problem of inability to effectively detect micro-cracks on the inner wall of high-temperature furnace tubes, and achieve convenient measurement, accurate measurement results, The effect of simple device structure

Inactive Publication Date: 2007-08-15
SHANDONG ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the micro-cracks on the inner wall of the high-temperature furnace tube cannot be effectively detected at present, and provide a method and devic

Method used

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  • Method for detecting microcrack of high temperature furnace inner wall of furnace and device therefor
  • Method for detecting microcrack of high temperature furnace inner wall of furnace and device therefor
  • Method for detecting microcrack of high temperature furnace inner wall of furnace and device therefor

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Example Embodiment

[0039] Implementation case 1:

[0040] There is a 130t / h boiler in a power plant. During the four years of operation, the high-temperature superheater tube is 12CrlMoV, the specification is φ42×3.5, and the tube bursts four times. In order to analyze the cause of the tube burst, the device of the present invention is used to measure and measure it. Oxidation corrosion and cracks on the inner wall of the high-temperature superheater tube. This superheater has a total of 60 rows and a total of 200 points of inspection. Two suspicious waveforms were detected in the area of ​​the previous tube burst, while the waveforms of other tubes were basically the same. The waveform of the detection process was relatively single and obvious, and it was a waveform without micro cracks. The following examples of waveforms are as follows. Figure 5 shows a waveform without oxidation cracks, and Figure 6 shows a waveform with oxidized microcracks.

[0041] Through this inspection, two pieces of forei...

Example Embodiment

[0042] Implementation case 2

[0043] The water wall material of a thermal power plant is 20g steel, the specification is φ65×5, and it leaks during 80,000 hours of operation. The blast hole is located in the water wall tube to the fire surface as a window and cracks along the longitudinal direction of the pipe. The maximum longitudinal opening is 52.36. mm, the maximum horizontal opening is 45.52mm. There is no obvious plastic deformation in the pipe section near the blast hole, and the edges of the blast hole are rough and brittle fracture morphology. Through metallographic analysis and macroscopic analysis, it was confirmed that the tube burst was caused by hydrogen embrittlement. Because hydrogen embrittlement has the characteristics of large area and suddenness, conventional inspection is difficult, and the present invention can quickly inspect the conditions of other pipes.

[0044]In order to check the condition of other pipes, a large-area inspection was carried out on the...

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Abstract

This invention discloses one method and device to test furnace high temperature inner wall crack, which comprises the following steps: a, firstly selecting multiple test points in tube outer wall for purification process; b, collecting tube inner wall micro crack point by point; c, sending the collected wave shape into display device and to process device; d, data process device uses software to compute out tube inner wall crack thickness.

Description

technical field [0001] The invention relates to a non-destructive testing technology for pipes, in particular to a method and device for detecting microcracks on the inner wall of a high-temperature furnace tube of a boiler, so as to detect the microcracks generated on the inner wall of the high-temperature furnace tube in the high-temperature furnace of the boiler during operation. Background technique [0002] For thermal power plant boilers, the heating surface is a heat transfer component, which is composed of evaporation heating surface, superheating heating surface, water and air preheating heating surface, mainly including economizer, superheater, water wall, reheater and Air preheater. They are all composed of serpentine alloy steel, stainless steel or carbon steel pipes, and the first four pipes are also called "four pipes". Among them, high-temperature furnace tubes mainly refer to superheater tubes and reheater tubes. According to statistics, in the boiler accide...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01B17/02
Inventor 张都清张广成王德洲
Owner SHANDONG ELECTRIC POWER RES INST
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