Abstract: In recent years, circulating fluidized bed boilers have been widely used in power production. However, due to long-term operation of the equipment, some problems that affect the safety and efficiency of the unit have gradually been exposed, such as tearing of the welding seam of the lifting lug of the separator center cylinder, and the extrusion and detachment of the lifting pouring material due to cylinder deformation, We hereby analyze and propose solutions for the efficiency improvement of the 2 * 300MW circulating fluidized bed boiler separator of Liaoning Diaobingshan Coal Gangue Power Generation Co., Ltd.