Method and hardware for supplying additives to the delayed coker drum

A method for supplying additives into a coker drum, the method comprising:

• a. supplying a hydrocarbon feed stream into coker drum;
• b. supplying additives through a plurality of conduits arranged along the circumference of walls of the coker drum, each of the plurality of the conduits being provided with an injection nozzle for supplying additives inside the coker drum;
• c. controlling the operation of the plurality of injection nozzles, including the steps of:
• i. configuring one or more of the injection nozzles placed within a first predetermined distance in a first direction along a vapour liquid interphase of the hydrocarbon feed stream to supply the additives;
• ii. discontinuing supply of the additive from a particular injection nozzle when a distance in the first direction between the injection nozzle and the vapour liquid interphase is less than or equal to a second predetermined distance;
• and
• d. optionally moving at least one of the plurality of conduits based on the level of the vapour liquid interphase of hydrocarbon feed stream in the coker drum.

An apparatus for supplying additive(s) into a coker drum, the apparatus comprising:

• a. an inlet for supplying hydrocarbon feed stream;
• b. a plurality of injection nozzles located at varying elevations into the walls of the coker drum;
• and
• c. an injection control system configured to control the operation of the plurality of injection nozzles, such that:
• i. one or more of the injection nozzles placed within a first predetermined distance in a first direction along a vapour liquid interphase of the hydrocarbon feed stream are configured to supply the additives;
• ii. supply of the additive discontinues from a particular injection nozzle when a distance in the first direction between the injection nozzle and the vapour liquid interphase is less than or equal to a second predetermined distance;
• and
• iii. one or more of the injection nozzles placed after a third predetermined distance in a second direction along a vapour liquid interphase are configured to supply steam.