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US 10,611,976 B2Granted
Thermochemical regeneration with superadiabatic flame temperature
AssigneePraxair Technology, Inc.
InventorsHisashi Kobayashi, Kuang-Tsai Wu
Life of this patent
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Abstract
Operation of a thermochemical regenerator at a controlled ratio of recycled flue gas to reforming fuel provides formation of fuel species that permit a higher flame temperature upon combustion of the resulting combustible mixture.
Claims11
A method of carrying out combustion in a furnace, comprising
- (A) combusting fuel in a furnace to produce gaseous combustion products, and
- (B) alternately (1) (i) passing gaseous combustion products from the furnace in which the gaseous combustion products were produced in step (A) into and through a cooled first regenerator to heat the first regenerator and cool said gaseous combustion products,
- (ii) passing at least a portion of said cooled gaseous combustion products from said first regenerator, and hydrocarbon fuel, into a heated second regenerator, at a reforming reaction stoichiometric ratio of said cooled gaseous combustion products to said hydrocarbon fuel of less than 1,
- (iii) reacting the gaseous combustion products and the fuel in the second regenerator in an endothermic reaction under conditions effective to form syngas comprising hydrogen and carbon monoxide and to form C2 species selected from the group consisting of C2H4, C2H2, and mixtures thereof which is combined in the syngas, and thereby cooling the second regenerator;
- and
- (iv) passing said syngas and C2 species from said second regenerator into said furnace in which the gaseous combustion products were produced in step (A) and combusting them in the furnace with one or more oxidant streams injected into said furnace;
- and
- (2) (i) passing a portion of the gaseous combustion products from the furnace in which the gaseous combustion products were produced in step (A) into and through a cooled second regenerator to heat the second regenerator and cool said portion of the gaseous combustion products,
- (ii) passing at least a portion of said cooled portion of gaseous combustion products from said second regenerator, and hydrocarbon fuel, into a heated first regenerator, at a reforming reaction stoichiometric ratio of said cooled gaseous combustion products to said hydrocarbon fuel of less than 1,
- (iii) reacting the gaseous combustion products and the fuel in the first regenerator in an endothermic reaction under conditions effective to form syngas comprising hydrogen and carbon monoxide and to form C2 species selected from the group consisting of C2H4, C2H2, and mixtures thereof which is combined in the syngas, and thereby cooling the first regenerator, and
- (iv) passing said syngas and said C2 species from said first regenerator into said furnace in which the gaseous combustion products were produced in step (A) and combusting them in the furnace with one or more oxidant streams injected into said furnace.
8 more elements
Dependencies are inferred from the claim text.