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Device and method for measuring thickness of scale on metal surface

A metal surface and measurement method technology, applied in electromagnetic measurement devices, electric/magnetic thickness measurement, etc., can solve the problems of difficult to achieve acoustic coupling, inability to achieve online measurement of scale thickness, etc., and achieve the effect of convenient integration

Inactive Publication Date: 2015-12-16
TSINGHUA UNIV
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  • Claims
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Problems solved by technology

For the fouling of the inner wall of the pipe such as the water pipe wall, acoustic coupling can be realized on the outer wall of the pipe; while for the scaling of the outer surface of the heating pipe, it is difficult to achieve good acoustic coupling due to the continuous growth of the scale and the increase in thickness, especially when the pipe When the scale thickness of the outer wall changes, the online measurement of the scale thickness cannot be realized

Method used

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  • Device and method for measuring thickness of scale on metal surface
  • Device and method for measuring thickness of scale on metal surface
  • Device and method for measuring thickness of scale on metal surface

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Embodiment

[0078] The metal parts are Qingfeng F1 anti-dry burning U-shaped heating tubes that heat quickly. The first auxiliary electrode and the second auxiliary electrode are stainless steel rods, and they are immersed in tap water together with the temperature sensor. Calibrate U-shaped heating tubes with thicknesses of 0 μm, 137 μm, 267 μm, 413 μm, 588 μm, and 643 μm, the temperature range of the solution is 0-100 °C, and the interval is 2 °C, and the calibration data is stored in the table.

[0079]For a U-shaped heating tube with an unknown scale thickness, the measured solution temperature is 22.5°C and ΔV is 16mV. Using one-dimensional interpolation, look up the thickness-ΔV data in the storage table when the corresponding solution temperature is 22°C, as shown in Table 1.

[0080] Table 1. Thickness-ΔV data at 22°C

[0081]

1

2

3

4

5

6

7

Thickness / μm

0

137

267

413

475

588

643

ΔV / mV

2

4

...

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Abstract

The invention relates to a device and a method for measuring the thickness of scale on the metal surface and relates to a device and a method for measuring the thickness of scale on the metal surface through double frequency excitation and three electrodes. According to the invention, two auxiliary electrodes and a metal piece are used to form a three-electrode system, the thickness of scale is analyzed by measuring a difference between double frequency output voltages under excitation of a constant current source, combining solution temperature information measured by a temperature sensor, looking up a table and performing interpolation, and the temperature of a solution and the thickness of scale are displayed on a display screen of an instrument. The thickness of scale on the metal surface is measured by an electrical method; combination with devices including temperature control system circuits such as water heaters is facilitated; and online measurement of the thickness of scale is achieved.

Description

technical field [0001] The invention relates to a device and a method for measuring the thickness of scale on a metal surface. Background technique [0002] Minerals are often found in industrial and domestic water. In heat exchange systems, such as boilers, electric water heaters and other equipment, scale is often deposited on metal surfaces that have been heated and cooled for a long time. Ultrasonic measurement is often used to measure the existing scale thickness. The ultrasonic measurement method measures the time difference of ultrasonic reflection at the aqueous solution-scale interface and scale-metal interface, and combines the speed of ultrasonic transmission to analyze and obtain the thickness of the scale. [0003] This method of thickness measurement requires good contact between the testing instrument and the metal of the test piece to achieve acoustic coupling. For the fouling of the inner wall of the pipe such as the water pipe wall, acoustic coupling can...

Claims

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Application Information

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IPC IPC(8): G01B7/06
Inventor 董永贵郑德焰
Owner TSINGHUA UNIV
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