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Method for determining performance of high-temperature sulfur corrosion prevention coating of water-cooling wall of boiler

A measurement method and water-cooled wall technology, applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, strength characteristics, etc., can solve problems such as lack of anti-corrosion effect, waste of engineering costs, lack of understanding of spraying technology in thermal power plants, etc. To achieve good anti-high temperature sulfur corrosion effect, durable protection, and beneficial to industry rectification and healthy development

Inactive Publication Date: 2016-10-12
GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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Problems solved by technology

[0003] However, due to the current chaotic water wall spraying market, the key is that thermal power plants also lack spraying technology understanding and coating quality supervision and inspection methods, resulting in widely varying spraying effects. Some coatings can last for 3 to 5 years and have good anti-corrosion effects; The coating will disappear in less than a few months, almost no anti-corrosion effect, wasting nearly one million engineering costs in vain

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  • Method for determining performance of high-temperature sulfur corrosion prevention coating of water-cooling wall of boiler

Examples

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Embodiment 1

[0044] In this example, a thermal power plant has carried out high-temperature sulfur-corrosion-resistant spraying on the water wall as an example. The spraying material is PS45 (which belongs to the NiCrTi series spraying material). The spraying construction is carried out by the supersonic arc spraying method widely used at present. The invention is used to measure the performance of the anti-high temperature sulfur corrosion coating of the water wall, and the measurement standards and processes are as follows.

[0045] 1) Analysis of chemical composition of raw materials: The Cr content in the coating material wire should reach more than 40%, and the Ni content should reach more than 50%.

[0046] The main reason is: because it contains more than 40% Cr element, a stable chromium oxide dense protective film will be formed during the spraying process, which can intercept the corrosion medium from entering the coating. The Ni element containing more than 50% will have super ...

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Abstract

The invention discloses a method for determining performance of a high-temperature sulfur corrosion prevention coating of a water-cooling wall of a boiler. The method comprises the following steps: (1) analyzing chemical constituents of raw materials of the coating, and testing alloy ingredients and contents of the raw materials; (2) measuring the thickness of the coating, and determining the thickness uniformity of the coating; (3) carrying out energy spectrum analysis and microstructure morphology testing on the coating, and determining micromorphology, porosity and phase composition; (4) testing the bonding strength of the coating, and determining the bonding strength of the coating and a water-cooling wall tube; (5) carrying out thermal shock test on the coating, and determining temperature cycling resistance of the coating; (6) carrying out high-temperature sulfur corrosion test on the coating, and determining the comprehensive performance of the high-temperature sulfur corrosion prevention coating; and (7) carrying out thermal transfer characteristic test on the coating. By the method, the high-temperature sulfur corrosion prevention effect of the coating can be evaluated comprehensively, and a determining system for identifying the performance of the high-temperature sulfur corrosion prevention coating is provided and is simple and reliable.

Description

technical field [0001] The invention relates to a method for measuring the performance of a high-temperature sulfur corrosion-resistant coating on a boiler water wall. Background technique [0002] In order to effectively reduce the No in flue gas X Concentration, thermal power plants have entered the peak period of low-nitrogen burner transformation. The transformation of the low-nitrogen burner leads to the strengthening of the reducing atmosphere at the water wall near the burner, which intensifies the high-temperature sulfur corrosion of the water wall. At present, one of the most effective ways to prevent high-temperature sulfur corrosion of water-cooled walls is to implement spraying. [0003] However, due to the current chaotic water wall spraying market, the key is that thermal power plants also lack spraying technology understanding and coating quality supervision and inspection methods, resulting in widely varying spraying effects. Some coatings can last for 3 to...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01B7/06G01N3/60G01N15/08G01N17/00G01N19/04G01N25/18
CPCG01B7/105G01N3/60G01N15/088G01N17/00G01N19/04G01N25/18G01N33/00G01N33/0096
Inventor 代真蔡培张云华邱质彬黄启龙谢航云
Owner GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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