Solid and oil removal method and device for chilled water and washed water in MTO (methanol to olefin) process

The invention relates to a solid and oil removal method and device for MTO (methanol to olefin)/MTP (methanol to propylene) chilled water and washed water. The method disclosed by the invention mainly comprises the following steps of carrying out ultrafiltration membrane separation on MTO/MTP chilled water, feeding an ultrafiltration membrane concentrated solution into a three-phase cyclone-separator separation system, and recovering a catalyst and oil; cooling ultrafiltration membrane permeated liquid, and feeding the obtained liquid back to a chilled water system to cyclically reuse; carrying out ultrafiltration membrane separation on MTO/MTP washed water, feeding an ultrafiltration membrane concentrated solution into the three-phase cyclone-separator separation system, and recovering a catalyst and oil; and cooling ultrafiltration membrane permeated liquid and feeding the obtained liquid back to a washed water system to cyclically reuse. The invention also provides a solid and oil removal device for MTO/MTP chilled water and washed water.