Delayed coker drum and method of operating thereof

A system comprising:

• a delayed-coker drum producing vaporized hydrocarbon products resulting through thermal cracking of a hydrocarbon-feed stream;
• a catalyst bed flow-connected to the delayed coker-drum for contacting said vaporized hydrocarbon products to trigger cracking;
• and
• an additional catalyst bed flow connected to the delayed coker drum for receiving said vaporized hydrocarbon products;
• wherein said at least two catalyst-beds receiving said vaporized hydrocarbon products from the delayed coker drum over different period of time.

A system comprising;

• a delayed coker drum;
• a moving catalyst bed located within and at about an exit of the delayed coker drum for contacting vapour products generated in the coker-drum and withdrawing vaporized hydrocarbon products formed therein;
• a stripper vessel connected to said catalyst bed for removing the entrained hydrocarbons within a spent-catalyst;
• and
• a regenerator connected to said stripper vessel for regenerating the received spent catalyst and further connected to the moving catalyst bed for providing the regenerated catalyst.