Why is the local abrasion of the furnace of a circulating fluidized bed boiler more serious?

　　(1) Unreasonable local structure or improper anti-wear measures.

　　(2) The refractory materials fall off.

　　(3) The verticality of the partial tube panel is not enough, causing this part of the tube to suffer long-term erosion.

　　(4) Protrusions from the welding process, and temporary lifting lugs were not polished, resulting in changes in the flow characteristics of the medium.