公开(公告)号：US11078429B2

公开(公告)日：2021-08-03

申请号：US16787757

申请日：2020-02-11

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： George Stephens ,  David B. Spicer

IPC: C10G9/20 ,  C10G9/36 ,  F23C5/00 ,  F23C5/08 ,  F23C9/00 ,  F23M5/02 ,  F23D14/08 ,  F23D14/70

Abstract: A burner sub-system, a furnace comprising the same, a fuel combustion process and steam cracking process carried out in the furnace. The burner sub-system comprises a barrier wall segment between the burner tip and the flue-gas recirculation (“FGR”) duct, effectively blocking direct gas flow between the burner tip and the FGR duct opening, but without encircling the whole burner tip. The presence of the partial barrier wall has the advantage of preventing the temperature inside the FGR duct from becoming too high, while achieving low NOx emissions from the combustion process without overheating the burner tip because of reduced amount of heat reflection to the burner tip compared to an annular barrier wall. The invention is particularly useful in furnaces where hydrogen-rich fuel gas is combusted.

公开(公告)号：US20200172815A1

公开(公告)日：2020-06-04

申请号：US16787757

申请日：2020-02-11

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： George Stephens ,  David B. Spicer

IPC: C10G9/20 ,  C10G9/36 ,  F23C5/00 ,  F23D14/70 ,  F23D14/08 ,  F23M5/02 ,  F23C9/00

Abstract: A burner sub-system, a furnace comprising the same, a fuel combustion process and steam cracking process carried out in the furnace. The burner sub-system comprises a barrier wall segment between the burner tip and the flue-gas recirculation (“FGR”) duct, effectively blocking direct gas flow between the burner tip and the FGR duct opening, but without encircling the whole burner tip. The presence of the partial barrier wall has the advantage of preventing the temperature inside the FGR duct from becoming too high, while achieving low NOx emissions from the combustion process without overheating the burner tip because of reduced amount of heat reflection to the burner tip compared to an annular barrier wall. The invention is particularly useful in furnaces where hydrogen-rich fuel gas is combusted.

公开(公告)号：US10160919B2

公开(公告)日：2018-12-25

申请号：US15064901

申请日：2016-03-09

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： David B. Spicer ,  Philippe J. Le Roy ,  George Stephens

IPC: C10G9/20 ,  C07C4/04 ,  C10G9/36 ,  F27B1/28 ,  F23N5/24

Abstract: A method and apparatus of reducing thermal shock in one or more radiant tubes of a pyrolysis furnace is provided. The apparatus is a furnace comprising a blower and blower bypass conduit providing separate fluid communication paths for flue gas from the convection section to a natural draft flue gas stack. The method comprises the steps of: redirecting at least a portion of the flue gas through the blower bypass conduit when a blower shut-off event is indicated as well as reducing the firing rate of the furnace.