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US 2026/0208135 A1Published application
Systems for oxyfuel combustion furnaces with heat recapture and reduced recirculation of flue gas
AssigneeSabic Global Technologies B.V.
InventorsArno Johannes Maria OPRINS, Dirk VOGELS, Leo KOERSVELT, Kenneth Francis LAWSON
Life of this patent
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Abstract
This disclosure includes oxyfuel furnaces for chemical-production processes, as well as systems for steam cracking and other chemical-production processes. Such furnaces utilize oxyfuel burners in the radiant section, and—rather than recirculating all flue gas from outlet of the convection section back to the radiant section—recirculates from the convection section a portion of flue gas that enters the convection section.
Claims15
A furnace for a chemical-production process, the furnace comprising:
- a radiant housing defining a radiant section with a gas inlet and a flue gas outlet;
- one or more oxyfuel burners disposed in the radiant section;
- a tube reactor disposed in the radiant section;
- a convection section with a convection inlet, a convection outlet, a convection channel extending from the convection inlet to the convection outlet, and a flue gas bypass disposed between the convection inlet and the convection outlet, where:
- the convection inlet is coupled to the flue gas outlet of the radiant section to receive flue gas from the radiant section;
- and
- the flue gas bypass is configured to direct a portion of received flue gas to one of:
- (i) the gas inlet of the radiant section;
- or
- (ii) a heater gas inlet of an oxyfuel flue gas heater that is configured to re-heat recirculated flue gas and convey the reheated flue gas to the convection inlet;
- or
- (iii) both (i) and (ii);
- where the convection section includes at least one heat exchanger disposed in the convection channel and configured to transfer thermal energy from the received flue gas to a mixture of steam and hydrocarbon feedstock;
- and
- where the convection section is configured to:
- (a) receive thermal energy from a source other than the received flue gas;
- or
- (b) direct the mixture of steam and hydrocarbon through an additional heater that receives thermal energy from a source other than the received flue gas;
- or
- (c) both (a) and (b).
17 more elements
A chemical-production system comprising:
- a furnace comprising:
- a radiant housing defining a radiant section with a gas inlet and a flue gas outlet;
- one or more oxyfuel burners disposed in the radiant section;
- a tube reactor disposed in the radiant section;
- a convection section with a convection inlet, a convection outlet, and a convection channel extending from the convection inlet to the convection outlet, where the convection inlet is coupled to the flue gas outlet of the radiant section to receive flue gas from the radiant section;
- where the convection section includes one or more heat exchangers disposed in the convection channel and configured to transfer thermal energy from the received flue gas to a hydrocarbon feedstock;
- where the convection section is configured to direct the hydrocarbon feedstock through an additional heater that receives thermal energy from a source other than the received flue gas;
- and
- where the radiant section is configured to heat the hydrocarbon feedstock to a reaction temperature;
- a carbon purification unit (CPU) coupled to the convection outlet, the CPU configured to isolate CO2 from the flue gas;
- and
- where the system is configured to direct substantially all flue gas received by the convection section to the CPU.
9 more elements
Dependencies are inferred from the claim text.