ll stripe or the convex surface of the bump improves the void ratio and specific surface area of the packing layer, has strong liquid redistribution ability, excellent vapor-liquid dispersion performance, and is used under the same conditions as the inert alumina ceramic ball. In comparison, the void ratio is increased by 12%, the contact specific surface area is increased by 25%, and the resistance is reduced by 15%. At the same time, it can contain and retain coke powder, colloid and heavy met