US 12,281,269 B2
Hybrid ethylene cracking furnace
Thomas M. Pickett, Houston, TX (US); Yong Wang, Houston, TX (US); Chinh Dang, Houston, TX (US); William Larson, Houston, TX (US); John Murphey, III, Houston, TX (US); George Dabney, Jr., Houston, TX (US); Huynh Pham, Houston, TX (US); and Astrid Han, Houston, TX (US)
Assigned to T.EN PROCESS TECHNOLOGY, INC., Houston, TX (US)
Filed by T.EN Process Technology, Inc., Houston, TX (US)
Filed on Oct. 15, 2020, as Appl. No. 17/071,999.
Prior Publication US 2022/0119716 A1, Apr. 21, 2022
Int. Cl. C10G 9/20 (2006.01); F28F 1/10 (2006.01)
CPC C10G 9/20 (2013.01) [F28F 1/10 (2013.01); C10G 2300/1059 (2013.01); C10G 2300/1074 (2013.01); C10G 2400/20 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for cracking at least two hydrocarbon feeds comprising:
feeding a first hydrocarbon feedstock into a single radiant zone of a firebox, wherein the first hydrocarbon feedstock follows a first path within the firebox defined through a plurality of U-shaped cracking coils;
feeding a second hydrocarbon feedstock into the firebox while feeding the first hydrocarbon feedstock to the single radiant zone, wherein the second hydrocarbon feedstock follows a second path within the firebox defined through a plurality of M-shaped cracking coils or W-shaped cracking coils, wherein the plurality of M-shaped cracking coils or W-shaped cracking coils are separate from the plurality of U-shaped cracking coils within the single radiant zone, wherein the cracking coils of the second hydrocarbon feedstock having a diameter greater than those of the first hydrocarbon feedstock;
heating each of the feedstocks within the single radiant zone of the firebox to convert each of the hydrocarbon feedstocks to a unique thermally cracked product;
collecting the thermally cracked products from the single radiant zone;
cooling the thermally cracked products; and
recovering at least two olefins from the thermally cracked products, wherein a heating temperature in the single radiant zone of the firebox for each of the first and second feedstocks is dependent on outlet temperature of the first hydrocarbon feedstock.