US 12,117,169 B2
Burner system for a steam cracking furnace
Peter Oud, Zoetermeer (NL); and Unal Kinik, Zoetermeer (NL)
Assigned to TECHNIP FRANCE, Courbevoie (FR)
Appl. No. 17/050,387
Filed by TECHNIP FRANCE, Courbevoie (FR)
PCT Filed Apr. 26, 2019, PCT No. PCT/EP2019/060731
§ 371(c)(1), (2) Date Oct. 23, 2020,
PCT Pub. No. WO2019/207105, PCT Pub. Date Oct. 31, 2019.
Claims priority of application No. 18169521 (EP), filed on Apr. 26, 2018.
Prior Publication US 2021/0048193 A1, Feb. 18, 2021
Int. Cl. F23D 14/64 (2006.01); C10G 9/36 (2006.01); F23C 9/08 (2006.01); F23L 7/00 (2006.01)
CPC F23D 14/64 (2013.01) [C10G 9/36 (2013.01); F23C 9/08 (2013.01); F23L 7/007 (2013.01); F23C 2202/10 (2013.01)] 23 Claims
OG exemplary drawing
 
1. Burner system for a radiant section of a steam cracking furnace configured to provide heat to the radiant section, the burner system comprising:
a fuel inlet;
an oxidant inlet; and
an ejector block located within the radiant section, wherein at least a portion of the ejector block is positioned above an interior facing surface of a furnace floor, and arranged to receive a propellant and a propelled fluid and arranged to premix said propellant with said propelled fluid, wherein the ejector block comprises an ejector of the constant area mixing type, wherein the ejector block includes: an ejector constant area mixing section in which the propellant and the propelled fluid are to be mixed; and an ejector diffusor in direct fluid connection with the ejector constant area mixing section from an inlet area towards a diffuser exit area being larger than the ejector diffuser inlet area, wherein the ejector constant area mixing section is at a distance from an entrance of the ejector block, wherein the burner system comprises a single outlet into the radiant section for an outlet flow of the at least partly unconverted mixture of fuel and/or oxidant combined with a propellant/propelled fluid pre-mixture, wherein the ejector block comprises a suction chamber formed at the entrance of the ejector block, which suction chamber is arranged to suck in the propelled fluid, wherein the suction chamber is arranged to increase a momentum of the propelled fluid causing the propelled fluid to first accelerate in the suction chamber along a longitudinal axis of the ejector block before being mixed with the propellant in the constant area mixing section and wherein the burner system further comprises a first nozzle configured to inject the propellant into the ejector block downstream of the ejector constant area mixing section, wherein the ejector block further comprises an ejector outlet bend downstream of the ejector diffusor and an ejector straight piece extension downstream of the ejector outlet bend such that the mixture of propellant and propelled fluid is directed into the same direction as the flow direction of the oxidant perpendicular to the longitudinal axis of the ejector block and parallel to an axis of the burner.