Research progress of critical deposition/stripping standards based on micron-sized particles

It is a thorny problem for micro-particle deposition based on gas-solid flow. Particle deposition is a common physical phenomenon but with more negative impact, such as the wear of turbine blades caused by sand particles, scale corrosion caused by fly ash particles on boiler heat exchange surface and so on. Although the continuous optimization of soot blowing scheme has greatly reduced the negative impact of fly ash deposition, there are still some uncontrollable problems. Therefore, it is of great significance to summarize and analyze the law of particle adhesion behavior to suppress particle deposition in engineering. Based on the main background of boiler fly ash deposition, this paper expounded the mechanism and characteristics of particle adhesion dominated by inertial impact, reviewed the research work on critical deposition criteria in recent years, focused on the analysis of the influence of deposition factors on the criteria of particle adhesion/rebound, and summarized the main criteria of particle detachment. By comparing the problems and connections of relevant criteria horizontally, the research status and existing problems of particle adhesion criteria was explained, which provided technical and theoretical support for the effective suppression of boiler deposition and the promotion of particle detachment theory. © 2023 Chemical Industry Press. All rights reserved.