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Dew point corrosion monitoring method based on electrochemical noise

An electrochemical noise and dew point corrosion technology, which is applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, scientific instruments, etc., can solve problems such as dew point corrosion in oil refineries, and achieve rich monitoring methods and good technical effects.

Active Publication Date: 2014-05-28
CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG +1
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the electrochemical noise method cannot be used in the prior art to monitor the dew point corrosion of oil refineries online, and a new dew point corrosion monitoring method based on electrochemical noise is provided

Method used

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  • Dew point corrosion monitoring method based on electrochemical noise
  • Dew point corrosion monitoring method based on electrochemical noise
  • Dew point corrosion monitoring method based on electrochemical noise

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Embodiment 1

[0012] The dew point corrosion electrochemical noise monitoring device of the present invention is composed of a three-electrode group probe, a high-resistance voltmeter, a zero-resistance ammeter, an A / D converter, a computer and corresponding software, which can be monitored online. The three-electrode group probe is composed of closely arranged electrodes of the same material, and the material is selected to be the same or similar to that of the equipment to be measured, so as to truly reflect the corrosion of the equipment. The material is made into small pieces of electrodes with a length of 20 mm and a width of 2 mm. Adjacent electrodes are lined with insulating sheets with a distance of about 0.2 mm. They are arranged in the order of W1W2RW1W2RW1W2 (W1 is the first working electrode, W2 is the second working electrode, R is the reference electrode), encapsulated with high temperature resistant epoxy resin. These electrodes are connected into three groups by wires, which...

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Abstract

The invention relates to a dew point corrosion monitoring method based on electrochemical noise, and mainly solves the problem that a dew point corrosion condition cannot be reflected in a real-time manner in the prior art. The method adopts the technical scheme that main components comprising a three-electrode-assembly probe, a zero-resistance ammeter, a high-resistance voltmeter, an A / D convertor and a computer are adopted; the three-electrode-assembly probe comprises a reference electrode assembly and two working electrode assemblies, and the reference electrode assembly is connected with the high-resistance voltmeter; the first working electrode assembly is connected with the zero-resistance ammeter and the high-resistance voltmeter respectively, and the second working electrode assembly is connected with the zero-resistance ammeter; potential noise generated by the high-resistance voltmeter and current noises generated by the zero-resistance ammeter enter the A / D convertor, and the A / D convertor is connected with the computer; the reference electrode assembly comprises at least one reference electrode, the first working electrode assembly comprises at least one working electrode, and the second working electrode assembly comprises at least one working electrode. The technical scheme well solves the problem. The dew point corrosion monitoring method can be used in dew point corrosion monitoring of oil refineries.

Description

technical field [0001] The invention relates to a dew point corrosion monitoring method based on electrochemical noise. technical background [0002] In refineries, there are dew point corrosion problems in heating furnace air preheaters and flues, waste heat boiler economizers and pipes, cylindrical heating furnace walls, various tower top condensation cooling systems, and tank top gas-liquid phase change parts. . The existing dew point corrosion monitoring methods mainly measure the dew point temperature or the weight loss of coupons, and the results given are only an indirect parameter or the average corrosion rate over a long period of time. The actual situation is that when the temperature of flue gas, water vapor, and oil gas is above the dew point temperature, it will basically not cause corrosion to the equipment; when the temperature drops below the critical temperature, corrosion will occur when the metal surface condenses to form a liquid film, and the corrosion ...

Claims

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Application Information

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IPC IPC(8): G01N17/02
Inventor 韩磊刘小辉张艳玲许述剑
Owner CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG
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