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Improvements in the detection of deposits comprising at least one ferromagnetic material on or close to the external wall of a tube

A technology of ferromagnetic materials and deposits, which is applied in the field of magnetic detection methods and devices, and can solve the problems of low precision of probes

Inactive Publication Date: 2011-08-31
ELECTRICITE DE FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the same manner as described above, this probe has very low accuracy and requires video image acquisition

Method used

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  • Improvements in the detection of deposits comprising at least one ferromagnetic material on or close to the external wall of a tube
  • Improvements in the detection of deposits comprising at least one ferromagnetic material on or close to the external wall of a tube
  • Improvements in the detection of deposits comprising at least one ferromagnetic material on or close to the external wall of a tube

Examples

Experimental program
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Embodiment Construction

[0040] refer to Figure 4 , describes a detection device 200 comprising a magnetized source probe 205 in a tube 215, for example comprising one or more permanent magnets, and means for driving said source 205 in said tube 215 in a rotational manner 210.

[0041] In the depicted example, the source 205 includes a single permanent magnet 206 supported by a mild steel plate 207 itself mounted on a stainless steel support 208 . Also shown in the figure is the magnetic plane PM of the permanent magnet 206 . It is radial with respect to the cylinder constituting the tube 215 .

[0042] Said rotary drive 210 notably comprises an electric gearbox 211 . The motor of this motorized gearbox 211 is connected to a device 212 for measuring the feed current of said motor, such as an electric meter, which device 212 is itself connected to a computer 213 of PC type. An algorithm in the form of a program recorded on a physical carrier such as the hard disk and / or memory of the computer 213 ...

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Abstract

The present invention relates to a method for the detection of fouling or clogging deposits comprising at least one ferromagnetic material, such as nickel, magnetite or similar material, on or close to the external wall of a tube, characterized in that it comprises at least the following steps: a magnetized source is positioned inside the tube and immobilized heightwise therein; the source is rotated about itself by being driven by means of an electric motor; and the intensity of the current drawn by said electric motor during this rotational movement is measured and the curve obtained is analysed in order to detect, and where appropriate evaluate, the clogging.

Description

technical field [0001] The present invention relates to the general field of magnetic detection methods and apparatus, and more particularly to methods for detecting fouling or fouling caused by deposits of ferromagnetic material located on or near cooling tubes of steam generators in pressurized water nuclear reactors or PWRs. Field of blocking methods and devices. Background technique [0002] In the field of nuclear power plants of the pressurized water reactor (PWR) type, it is known that the heat generated in the center of the reactor is transferred through a closed loop, known as the primary loop, in which the water flows to the so-called secondary loop, where the In this secondary loop, the water that has been converted to steam is fed to a turbine where it is used to generate electricity. [0003] refer to figure 1 , which represents a sectional perspective view of a steam generator, each PWR type nuclear power plant usually has three or four steam generators, wher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90G01N27/72
CPCG01N27/72G01N27/902G01N27/90
Inventor A·杰马
Owner ELECTRICITE DE FRANCE
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