US 12,467,698 B2
Thermal cracking tube with fluid agitating element
Motoyuki Matsubara, Hirakata (JP); and Kunihide Hashimoto, Hirakata (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Appl. No. 17/783,454
Filed by KUBOTA CORPORATION, Osaka (JP)
PCT Filed Dec. 23, 2020, PCT No. PCT/JP2020/048116
§ 371(c)(1), (2) Date Jun. 8, 2022,
PCT Pub. No. WO2021/132310, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-237855 (JP), filed on Dec. 27, 2019.
Prior Publication US 2023/0019289 A1, Jan. 19, 2023
Int. Cl. F28F 1/40 (2006.01); C10G 9/20 (2006.01)
CPC F28F 1/40 (2013.01) [C10G 9/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A thermal cracking tube having one or more fluid agitating elements formed on and projecting inwardly from an inner surface of the tube,
the one or more fluid agitating elements comprising
a fin extending along the inner surface of the tube, and
bumps provided on a region near the fin and projecting inwardly from the inner surface of the tube, wherein
the fin comprises a plurality of fins formed on the inner surface of the tube at an interval of I, and
the bumps are provided on the region at least up to I/2 of the upstream side and/or I/2 of the downstream side of the fin.