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

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...

AI Technical Summary

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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