Rotational flow-microchannel-coalescence combined closed treatment method and device for coke cooling sewage

The invention relates to a rotational flow-microchannel-coalescence combined type closed coke cooling sewage treatment method and device, and provides a rotational flow-microchannel-coalescence combined type closed coke cooling sewage treatment method which comprises the following steps: (a) cooling coke cooling hot sewage generated by delayed coking to 5-55 DEG C under the absolute pressure of 0.1-0.25 MPa to obtain coke cooling sewage, the content of coke powder in the coke cooling sewage is 0.01-2wt%; (b) performing coarse separation on the coke cooling sewage by adopting cyclone separation to obtain a coke powder phase and primary clear liquid; (c) further separating the fine coke powder in the primary clear liquid by adopting rotational flow oscillation reinforced microchannel separation to obtain a secondary clear liquid; (d) carrying out oil-water separation on the second-stage clear liquid by adopting mixed weaving and coalescence to obtain a third-stage clear liquid and an oil phase; and (e) cooling