Method for operating a fired furnace and arrangement comprising such a furnace
AssigneeLinde Aktiengesellschaft
InventorsMartin Adendorff, Marco Golbach, Michael Seys, Benjamin Hentschel, Maximilian Jarosch
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Abstract
The invention concerns a process for operating a fired furnace which is heated using a fuel gas stream and forming a combustion product stream, wherein heat of at least part of the combustion product stream is used in forming a steam stream. It is provided that at least a part of the steam stream is subjected to a high-temperature electrolysis to form a hydrogen-containing and an oxygen-containing material stream, and that at least a part of the hydrogen-containing material stream is used as the fuel gas stream. A corresponding arrangement is also the subject of the invention.
Claims18
A method for operating a fired furnace, comprising:
- heating a fired furnace using a fuel gas stream and forming a combustion product stream,
- forming a steam stream using heat from at least a part of the combustion product stream,
- subjecting at least a part of the steam stream to a high temperature electrolysis to form a hydrogen-containing substance stream and an oxygen-containing substance stream, and
- using at least a part of the hydrogen-containing substance stream as the fuel gas stream,
- wherein formation of the steam stream comprises a plurality of heat exchange steps to which the combustion product stream or a part thereof is subjected, wherein water used to form the steam stream and/or steam used to form the steam stream is heated in the heat exchange steps, and
- wherein the plurality of heat exchange steps comprises a first heat exchange step in which
- (a) the combustion product stream or a portion thereof is cooled from a temperature level of 1400 to 1600° C. to a temperature level of 900 to 1100° C., and in which saturated steam used to form the steam stream is superheated from a temperature level of 100 to 120° C. to a temperature level of 700 to 900° C., or
- (b) the combustion product stream or a portion thereof is cooled from a temperature level of 1400 to 1600° C. to a temperature level of 600 to 700° C., and in which water used to form the steam stream is evaporated to form saturated steam.
A method for operating a fired furnace, comprising:
- heating a fired furnace using a fuel gas stream and forming a combustion product stream,
- forming a steam stream by preheating water, evaporating the preheated water to form saturated steam, and heating the saturated steam to form superheated steam, wherein heat from at least a part of the combustion product stream is used in forming the steam stream,
- subjecting at least a part of the steam stream to a high temperature electrolysis to form a hydrogen-containing substance stream and an oxygen-containing substance stream, and
- using at least a part of the hydrogen-containing substance stream as the fuel gas stream,
- wherein formation of the steam stream comprises a plurality of heat exchange steps to which the combustion product stream or a part thereof is subjected, wherein water used to form the steam stream and/or steam used to form the steam stream is heated in the heat exchange steps, and
- wherein the plurality of heat exchange steps comprises a first heat exchange step in which
- (a) the combustion product stream or a portion thereof is cooled from a temperature level of 1400 to 1600° C. to a temperature level of 900 to 1100° C., and in which saturated steam used to form the steam stream is superheated from a temperature level of 100 to 120° C. to a temperature level of 700 to 900° C., and/or
- (b) the combustion product stream or a portion thereof is cooled from a temperature level of 1400 to 1600° C. to a temperature level of 600 to 700° C., and in which water used to form the steam stream is evaporated to form saturated steam.
Dependencies are inferred from the claim text.