The Experimental Study On Tube Erosion By Particles Flowing Around Tube Under Low Velocity

Particles with high temperature (800-1000℃) exist in many industries such as metallurgy, electric power, chemical industry and so on in the shape of produce or secondary product. During the rational utilization of waste heat and energy of particles with high temperature, there is abrasive wear between particles and tubes. As is known to all, China loss billion dollars and ten thousand tons of iron and steel because of wear every year. Along with China’s serious energy conservation and emissions reduction, the relationship of abrasive wear between high temperature particles and tubes has become a need to overcome.This paper has to self-design a abrasion testing machine according to mode of motion and contacting form, using this machine to investigate the influence (particle diameter> velocity and temperature) on tubes wear (copper and aluminum). The experiment result indicates that:(1) Different materials has different abrasive wear rule, the point of affecting material abrasion characteristics is oxidation film on the surface of material; After abrasion wear, gouging and material stacking can be seen clearly, at the same time, roughness of material will be higher after abrasive wear;(2) With the particle rang from0.8to2.25mm in diameter, quality loss per wear area will increase, what is worth to noticing, quality loss will be increase sharply when particle diameter increase from1.715to2.25mm; copper and aluminum has a linear relationship between quality loss per wear area and particle velocity with the range of7.3-18cm/s; when considering the relationship of particle temperature, material’s quality loss per wear area will decline and then increase at the constant temperature293-513K, critical temperature is403K;(3) The roughness of material after abrasive wear increases with the increase of particle diameter, the roughness of copper will be lower than copper before wear experiment when the diameter is0.8mm; at the same time, the roughness of material after abrasive wear increases with the increase of particle velocity and particle temperature, the roughness is not obvious when the particle temperature is between293K and513K, but it will be increased shapely when the temperature is above403K;(4) The wearing depth increases with the increase of particle diameter and particle velocity, it will decline before348K and then increase with the increase of particle temperature, the minimum wearing depth is5.016μm at348K, the maximum wearing depth is23.65μm at513K, three or four times for wearing depth at normal temperature;(5) This paper fits a regression equation using copper’s quality loss per wearing area, the equation obtained is significant at the level of1%, then to test its applicability through experiment of aluminum, the result shows that the error is small with high applicability.