A high heat absorption rate metal pipe wall anti-corrosion and anti-slag wear-resistant ceramic coating

Abstract

The invention discloses a high absorptivity metal pipe wall anti-corrosion and slag resistance wear-resisting ceramic coating, which comprises main components with proportions by weight: silicon carbide 5-15%, brown fused alumina 10-20%, boron nitride 3-8%, boron carbide 2-8%, zirconia 5-10%, potassium titanate 1-3%, chromium oxide 5-10%, iron oxide 5-10%, ball clay 3-10% and high temperature inorganic binder 30-50%, wherein the total weight of the components is 100%. The granularities of all solid components of the high absorptivity metal pipe wall anti-corrosion and slag resistance wear-resisting ceramic coating are less than or equal to 2 microns, parts of components achieve nanometer scales, and the granularities of the parts of components are less than or equal to 100 nanometers. The high absorptivity metal pipe wall anti-corrosion and slag resistance wear-resisting ceramic coating adopts water as solvent, adopts modified high temperature modified inorganic binder as a film forming matter, and determines the addition of the water according to different construction methods, the construction methods comprises a brush coating and a spraying methods, and the volume density of the high absorptivity metal pipe wall anti-corrosion and slag resistance wear-resisting ceramic coating is in 1650-1850kg / m3. The invention discloses a method for making the high absorptivity metal pipe wall anti-corrosion and slag resistance wear-resisting ceramic coating simultaneously.

Description

[0001] Technical field: [0002] The invention relates to an anti-corrosion and slag-resistant and wear-resistant ceramic coating for metal pipe walls with high heat absorption rate and a preparation method thereof. In industrial equipment, the metal pipe wall used for heat exchange is anti-corrosion and anti-slag anti-wear. [0003] Background technique: [0004] Take the boiler as an example. During the operation of the boiler, the thermal efficiency of the boiler is mainly determined by the heat absorption rate of the heating surface. The heating surface is the carrier of heat energy exchange, which improves and maintains the heat absorption rate of the metal tube wall and has a long service life. It is an important condition to ensure the efficient operation of the boiler. However, the actual situation is that the thermal efficiency of the boiler continues to decline with the extension of time during operation. Although there are many factors, the most important factor is ...

AI Technical Summary

Problems solved by technology

However, the actual situation is that the thermal efficiency of the boiler continues to decline with the extension of time during operation. Although there are many factors, the most important factor is the decline in the heat exchange capacity of the metal tube wall.

[0005] Let’s take a coal-fired boiler as an example to illustrate the problem. After the coal is burned in the furnace, a large amount of fly ash is precipitated, and mixed with water vapor, sulfur dioxide, sulfur trioxide, and other components in the flue gas to form sticky peptide impurities. The high-temperature flue gas flows into the dust removal treatment, and a part of it is deposited on the surface of the water-cooled tube wall in the furnace, the surface of the convection tube, and the surface of the air preheater. It forms a kind of hard coke and hard scale that is very difficult to clean, hinders the heat absorption capacity of the metal tube wall, causes the temperature of the furnace to rise, the temperature of the exhaust gas rises, the thermal efficiency of the boiler decreases, consumes a lot of fuel, and increases the production cost; and the metal tube wall is long-term Working at high temperature, the surface of the tube wall will be oxidized and corroded and sulfide-corroded, which will shorten the life of the heating tube and increase the maintenance cost; and due to the different combustion methods, the tube wall of the local heating surface in the boiler will also wear a lot