Scale detecting instrument in tube on high-temperature heating surface of supercritical boiler and detection method

A technology of supercritical boilers and heating surface tubes, which is applied in the direction of electromagnetic measuring devices, electric/magnetic thickness measurement, etc., can solve the problems of bulky detection instruments, long measurement time, and injury to measurement personnel, and achieve the effect of wide detection range

Inactive Publication Date: 2010-06-23
GUANGDONG TOPKEY POWER TECHN DEV +1
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the prior art, to provide a supercritical boiler high-temperature heating surface tube oxide skin detector and detection method, to realize the accurate judgment of the t

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  • Scale detecting instrument in tube on high-temperature heating surface of supercritical boiler and detection method
  • Scale detecting instrument in tube on high-temperature heating surface of supercritical boiler and detection method
  • Scale detecting instrument in tube on high-temperature heating surface of supercritical boiler and detection method

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Embodiment Construction

[0024] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto.

[0025] figure 1 Shown is the block diagram of the scale detector system in the supercritical boiler’s high-temperature heating surface tube, which includes a DC power supply, a probe, an amplifier circuit, a subtractor, an A / D converter, a single-chip microcomputer, and a character dot-matrix liquid crystal display 4 . Among them, the power supply adopts a portable DC power supply, which makes the detector easy to carry and use; the probe is composed of a permanent magnet 1 and a Hall sensor 2, which are connected through a U-shaped clamp arm 3, and are divided into a measuring probe and a reference probe; the amplifying circuit adopts TLC27M2. The voltage signal detected by the probe is amplified; the subtractor is used to compare the voltage signals from the measuri...

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Abstract

The invention discloses a scale detecting instrument in a tube on a high-temperature heating surface of a supercritical boiler and a detection method. The detecting instrument comprises a measuring probe, a reference probe, an amplifying circuit, a subtracter, an A/D converter, a singlechip and a display. In the detection method, magnetic signals from a position to be detected and a scale-free position of the detected tube are respectively converted into voltage signals by the measuring probe and the reference probe; after the two voltage signals are amplified by the amplifying circuit, differential voltage signals are acquired through the subtracter and converted into digital signals by the A/D converter; and the digital signals are sent to the display for displaying after being processed by the singlechip. According to the difference value of magnetic flux density detected by the measuring probe and the reference probe, the scale detecting instrument can detect the thickness of scales in the tube on the heating surface quantitatively, and thus the scale detecting instrument can perform quantitative detection quickly and conveniently on the accumulation thickness of the scales in the tube on the high-temperature heating surface of the boiler.

Description

technical field [0001] The invention belongs to the technical field of magnetic non-destructive testing, and provides a supercritical boiler high-temperature heating surface tube internal oxide skin detector and a detection method, which are used for non-destructive testing of supercritical boiler high-temperature heating surface tube internal oxide skin, especially for large super ( Detect the accumulation of oxide scales at the pipe bends in supercritical power plant boilers. Background technique [0002] In recent years, with the continuous improvement of technical parameters and capacity of thermal power plants, austenitic stainless steel pipes have become more and more widely used on the heating surface of super (super) critical boilers. At present, the grades of austenitic stainless steel materials used in China mainly include Super304H, TP316H, TP347H and Russian 12Cr18Ni12Ti etc. Although the oxidation resistance temperature of austenitic stainless steel can reach a...

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Application Information

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IPC IPC(8): G01B7/06
Inventor 周其贵刘定平郑锦溪林俊滨胡剑琛艾志虎陈茂培陈钊
Owner GUANGDONG TOPKEY POWER TECHN DEV
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