A METHOD OF DECOKING A CRACKING FURNACE
A method of decoking a cracking furnace includes: heating the cracking furnace to a specified average temperature; injecting a gas mixture including air and steam through the at least one tube at a first air to steam ratio; injecting the gas mixture through the at least one tube at a second air to s...
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Main Authors | , , , , , |
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Format | Patent |
Language | English French |
Published |
02.05.2024
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Abstract | A method of decoking a cracking furnace includes: heating the cracking furnace to a specified average temperature; injecting a gas mixture including air and steam through the at least one tube at a first air to steam ratio; injecting the gas mixture through the at least one tube at a second air to steam ratio upon observing a decrease in the outlet point temperature from the first temperature; and combusting at least a second portion of the coke on the internal surface of the at least one tube. Additionally, the outlet point temperature does not exceed the specified average temperature; the second air to steam ratio is greater than the first air to steam ratio; and the cracking furnace includes at least one tube for transferring a feed, the at least one tube entering the cracking furnace at an inlet point and exiting the cracking furnace at an outlet point.
La présente invention concerne un procédé de décokage d'un four de craquage consistant : à chauffer le four de craquage à une température moyenne spécifiée ; à injecter un mélange gazeux incluant de l'air et de la vapeur par le ou les tubes à un premier rapport air-vapeur ; à injecter le mélange gazeux par le ou les tubes à un second rapport air-vapeur lors de l'observation d'une diminution de la température du point de sortie par rapport à la première température ; et à brûler au moins une seconde partie du coke sur la surface interne du ou des tubes. En outre, la température du point de sortie ne dépasse pas la température moyenne spécifiée ; le second rapport air-vapeur est supérieur au premier rapport air-vapeur ; et le four de craquage inclut au moins un tube pour transférer une alimentation, l'au moins un tube entrant dans le four de craquage au niveau d'un point d'entrée et sortant du four de craquage au niveau d'un point de sortie. |
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AbstractList | A method of decoking a cracking furnace includes: heating the cracking furnace to a specified average temperature; injecting a gas mixture including air and steam through the at least one tube at a first air to steam ratio; injecting the gas mixture through the at least one tube at a second air to steam ratio upon observing a decrease in the outlet point temperature from the first temperature; and combusting at least a second portion of the coke on the internal surface of the at least one tube. Additionally, the outlet point temperature does not exceed the specified average temperature; the second air to steam ratio is greater than the first air to steam ratio; and the cracking furnace includes at least one tube for transferring a feed, the at least one tube entering the cracking furnace at an inlet point and exiting the cracking furnace at an outlet point.
La présente invention concerne un procédé de décokage d'un four de craquage consistant : à chauffer le four de craquage à une température moyenne spécifiée ; à injecter un mélange gazeux incluant de l'air et de la vapeur par le ou les tubes à un premier rapport air-vapeur ; à injecter le mélange gazeux par le ou les tubes à un second rapport air-vapeur lors de l'observation d'une diminution de la température du point de sortie par rapport à la première température ; et à brûler au moins une seconde partie du coke sur la surface interne du ou des tubes. En outre, la température du point de sortie ne dépasse pas la température moyenne spécifiée ; le second rapport air-vapeur est supérieur au premier rapport air-vapeur ; et le four de craquage inclut au moins un tube pour transférer une alimentation, l'au moins un tube entrant dans le four de craquage au niveau d'un point d'entrée et sortant du four de craquage au niveau d'un point de sortie. |
Author | FRANK, Ernest R BELLOS, Georgios LI, Liwei SABBAH, Rami H DAVIS, Mark B YUAN, Quan |
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DocumentTitleAlternate | PROCÉDÉ DE DÉCOKAGE D'UN FOUR DE CRAQUAGE |
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Snippet | A method of decoking a cracking furnace includes: heating the cracking furnace to a specified average temperature; injecting a gas mixture including air and... |
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SubjectTerms | CHEMISTRY CRACKING HYDROCARBON OILS FUELS LUBRICANTS METALLURGY MINERAL WAXES PEAT PETROLEUM, GAS OR COKE INDUSTRIES PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS REFORMING OF NAPHTHA TECHNICAL GASES CONTAINING CARBON MONOXIDE |
Title | A METHOD OF DECOKING A CRACKING FURNACE |
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