Equipment and method for cooling high-pressure circulating gas

The invention discloses equipment and a method for cooling high-pressure circulating gas, and belongs to the technical field of polyethylene cooling separation. Comprising a shell, an upper end tube box and a lower end tube box, a tube bundle structure is arranged in the shell, the tube bundle structure is formed by bundling a plurality of heat exchange tubes, the upper end tube box is installed on the top of the shell through a plurality of bolts, a process gas inlet penetrates through the top of the shell, and the lower end tube box is installed at the bottom of the shell through a plurality of bolts, and a process gas outlet penetrates through the bottom of the shell. The upper end tube box and the lower end tube box are both in a conical barrel shape, and the distribution piece is detachably connected into the process gas inlet and comprises a lens pad and a distributor which are integrally formed. According to the invention, when the working condition needs to be switched to a high-pressure purging worki