Preheating process module integrated with coke handling system for steam cracking of hydrocarbon feedstock

A process for steam cracking a hydrocarbon feedstock in a hydrocarbon cracking furnace, wherein the hydrocarbon feedstock is preheated in a preheating process module, and wherein the preheating process module is integrated with a coke handling system for supply of coke required for combustion from a coke storage yard, the process comprising:

• a. feeding coke lumps after screening from the coke storage yard to a hopper and conveying to a roller crusher for crushing through conveyer belts to obtain crushed coke;
• b. feeding the crushed coke after screening to a second hopper and conveying the coke of a desired particle size from the second hopper to a coke storage vessel through a second conveyer belt;
• c. conveying the coke from the coke storage vessel to a heat source vessel, wherein the coke is combusted in presence of an oxygen containing gas to generate heat to heat up heat carrier particles;
• d. transporting the heat carrier particles from the heat source vessel to a stripper, wherein oxygen and residual coke particulates are stripped off using steam leaving as a mixture from a top of the heat source vessel ensuring no oxygen reaches to a heat sink vessel;
• e. transporting the heat carrier particles to the heat sink vessel wherein the hydrocarbon feedstock supplied into the heat sink vessel is contacted with the heat carrier particles which in turn preheat the hydrocarbon feedstock to generate preheated hydrocarbon vapors;
• f. recycling back the heat carrier particles to the heat source vessel for reheating;
• g. feeding the preheated hydrocarbon vapors to a cyclone separator to remove unwanted particles;
• h. contacting flue gas generated by combustion of the coke with steam in an upper section of the heat source vessel using shell and tube type arrangement resulting in the formation of dilution steam at a desired temperature and pressure leaving an exhaust gas mixture comprising CO2 and steam from the top of heat source vessel;
• i. cooling the exhaust gas mixture in a cooler and feeding to a separator to obtain CO2 rich gas stream from a top of the separator;
• j. routing the dilution steam from shell and tube type arrangement to the heat sink vessel wherein it mixes with the preheated hydrocarbon vapors to create a mixed stream thereby reducing the coke formation tendency in the heat source vessel;
• k. feeding the mixed stream to the hydrocarbon cracking furnace wherein thermal cracking of the hydrocarbon feedstock occurs resulting in the formation of cracked gases, wherein the cracked gases are routed to further separation sections for recovery and recycle of unconverted gases back to the heat sink vessel.