Process for delaying coking

The invention provides a process for delaying coking, which comprises the following steps that raw oil is heated through a heating furnace to be divided into two parts, wherein one part enters a coking tower from the top part or the side of the coking tower, and the other part enters the coking tower from the bottom part of the coking tower, the two parts react in the coking tower to generate oil gas, the oil gas flows out of the top part or the upper part of the coking tower to enter a coking fractionating tower, and generated coke is maintained in the coking tower; and a distributor is arranged at the raw oil inlet in the coking tower, so that the raw material entering the coking tower from the upper part of the coking tower becomes small liquid drops through the distributor, the evaporation area and vapor pressure of the raw oil can be increased, the gasification of the raw oil and the generated oil is facilitated, the occurrence of the secondary reaction can be reduced, further, the liquid yield of the process for delaying coking can be increased, and the height of the foam layer in the coking tower can be reduced.