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Method for detecting scale cinder accumulation amount in boiler bent pipe

A technology of oxide skin and accumulation, which is applied in weighing, instruments, etc., can solve the problems of frequent tube explosion, low sensitivity, and difficulty in oxide skin accumulation, and achieve the effect of improving detection efficiency, high sensitivity, and loose environmental requirements

Active Publication Date: 2010-07-21
STATE GRID HUNAN ELECTRIC POWER CO LTD ELECTRIC POWER SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a method for detecting the amount of oxide scale accumulation in the boiler elbow, which utilizes the oxidation of the inner wall of the elbow to solve the defect that the ray detection method is difficult and has low sensitivity to detect the scale accumulation in the boiler elbow. According to the relationship between scale accumulation and residual magnetic field strength, a reliable, convenient and rapid detection of oxide scale in the elbow is carried out, so as to detect and deal with blockage in time, and avoid frequent pipe bursts caused by oxide scale blockage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Select different materials, different specifications and different types of boiler elbow samples from the boiler site, and take out the scale from the sampled pipe;

[0019] (2) To simulate the boiler site, add 1g of scale to one end of the sampling tube respectively;

[0020] (3), on the outer wall of the elbow lower part of the sample tube that is added with scale in step (2), apply a stable constant magnetic field using a conventional method, and utilize this magnetic field to carry out conventional magnetization treatment to the scale accumulated in the bend;

[0021] (4), evacuate the magnetic field set in step (3), use conventional methods to measure the residual magnetic field strength value of the scale in the elbow of the sample pipe, and record the scale corresponding to different materials, specifications and types of scale in the bend of the sample pipe The residual magnetic field strength value corresponding to the accumulation amount;

[0022] (5), on...

Embodiment 2

[0030] Step (1) is with embodiment 1;

[0031] (2) To simulate the boiler site, add 9g of scale to one end of the sampling tube respectively;

[0032] Steps (3)~(4) are the same as in Example 1;

[0033] (5), one end of the sample tube that is added with scale in step (2) gradually adds scale in multiples of 9g described in step (2);

[0034] Steps (6)-(11) are the same as in Example 1.

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PUM

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Abstract

The invention discloses a method for detecting scale cinder accumulation amount in a boiler bent pipe, comprising the following steps: (1) selecting a sample on site; (2) simulating the site, adding scale cinder in one end of a test cylinder; (3) magnetizing; (4) measuring the strength value of a remanence magnetic field; (5) progressively increasing the scale cinder; (6) repeating steps (3) and (4); (7) repeating steps (5) and (6); (8) building a graph of relation; (9) detecting on site, and magnetizing; (10) measuring the strength value B of the remanence magnetic field; and (11) using the graph of relation to compare with a tested bent pipe, and finding the scale cinder accumulation amount in the detected boiler bent pipe. When being used for detection, the method can carry out nondestructive inspection to the scale cinder in a service boiler bent pipe without special treatment and has the characteristic of high sensitivity and is simple, safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and relates to a method for detecting the accumulated amount of scale in a boiler elbow. It is suitable for detecting the amount of scale accumulation in the elbow of large boilers. Background technique [0002] During the use of power plant boiler tubes, there will usually be severe scale peeling on the steam side, and the peeled scale will form a blockage in the boiler elbow. The blocked boiler elbow will cause a sharp rise in temperature, causing overheating and bursting, seriously affecting the safety of the boiler. Stable operation. In order to prevent the occurrence of tube burst accidents, it is necessary to detect the amount of scale accumulation in the boiler elbow. At present, radiation detection is generally used to measure the amount of scale accumulation in boiler elbows. Due to the limitation of site space, it is difficult to implement this method and it is easy to...

Claims

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Application Information

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IPC IPC(8): G01G7/00
Inventor 龙会国龙毅陈红冬谢国胜
Owner STATE GRID HUNAN ELECTRIC POWER CO LTD ELECTRIC POWER SCI RES INST
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