Hybrid high-temperature fouling and erosion characteristics of gas-particle flow around heating tube via CFD-DEM

High temperature fouling and erosion via CFD-DEM. [Display omitted] •High-temperature fouling and erosion sub-models were raised considering temperature.•Morphologies predictions were solved by clustered particles and dynamic mesh.•A high-efficiency calculation of coupling fouling and erosion was developed.•Hybrid fouling and erosion characteristics of heating tube were presented. In this study, hybrid fouling and erosion of heating tube are presented via CFD-DEM. To analyze their characteristics, new high-temperature fouling and erosion sub-models, using a soft-sphere model considering the temperature-corrected material properties, are raised. The prediction of coupling morphologies is solved by clustered particles and dynamic mesh. The magnification factors of time are applied to the computation speedup for a long-time fouling and erosion. Results indicate that good agreements, of the critical adhesion velocity, high-temperature fouling and erosion on the heating tube, have been found between the experimental measurements and numerical predictions. As the inlet flow temperature goes up, the fouling amount increases, and oppositely the erosion amount decreases. As the surface temperature increases, both fouling and erosion amounts increase. As the particle size increase, the primary determinant of fouling varies from the impact efficiency to the impact efficiency and the critical adhesion velocity. Most innovative is to reveal the competition between the fouling and the erosion. In addition, reducing the surface temperature, as a way of temperature control, should be the priority to reduce fouling and erosion.