Crude propylene recovery system of polypropylene device

The utility model discloses a crude propylene recovery system of a polypropylene device, which belongs to the technical field of polypropylene production and comprises a crude propylene cooler, a propylene recovery tank, a crude propylene filter, an ethylene removal tower, a crude propylene pump and a propylene delivery pump. The crude propylene cooler is connected with the propylene recovery tank and is used for conveying liquid-phase crude propylene; the top of the propylene recovery tank is connected with an ethylene removal tower; the bottom of the propylene recovery tank is connected with a crude propylene filter through a crude propylene pump; the other end of the crude propylene filter is connected with the ethylene removal tower; a tower top condenser and a tower bottom reboiler are arranged in the ethylene removal tower for purifying propylene; a tower top gas outlet of the ethylene removal tower is connected with a torch header pipe to discharge non-condensable gas; and a liquid outlet at the bottom