Method for lifting, translating and mounting tray supporting beam of oversized raffinate tower

The invention belongs to the technical field of installation of chemical equipment, and particularly relates to a lifting and translation installation method for a tray supporting beam of a super-large raffinate tower. The tower tray supporting beam in the whole equipment can be hoisted only by a few hoisting devices, the tower tray supporting beam is gradually transported to the center in the tower by utilizing the self weight of the tower tray supporting beam, a traction device in the tower does not need to be arranged, and the installation cost is greatly reduced; the first-stage preset supporting beam and the second-stage preset supporting beam serve as supporting beams of the tower tray and are left in the tower, the mounting process is reasonable, and waste of workpieces is reduced to the maximum extent; the weight of the lower part is always large, and the overall stability of the tower body is ensured in the mounting process; by means of repeated process installation of the three-stage tower body supp