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US 12,687,341 B2Granted
Fuel blending in thermochemical heat exchange methods
AssigneePraxair Technology, Inc.
InventorHisashi Kobayashi
Life of this patent
Estimating the term…
Abstract
Disclosed is a thermochemical regenerative combustion method in which a mixture of fuel components that can, and cannot, undergo endothermic reaction is passed through a heated regenerator to obtain improved heat recovery efficiency.
Claims26
A method of operating a furnace at a specified production rate, comprising
- (A) producing gaseous combustion products by combusting in the furnace a fuel product, wherein the fuel product is produced in a heat exchanger by
- (B) (i) feeding into the heat exchanger a fuel mixture which comprises an amount of a first fuel and an amount of a second fuel, and (ii) endothermically reacting the fuel mixture in the heat exchanger to form the fuel product, and (iii) passing said gaseous combustion products from the furnace into and through the heat exchanger to provide heat to the endothermic reaction that forms the fuel product;
- and
- (C) feeding the fuel product from the heat exchanger into the furnace to be combusted,
- under conditions to maintain the specified production rate wherein the amount of heat transferred in the heat exchanger from the gaseous combustion products to the fuel mixture relative to the amount of heat contained in the gaseous combustion products is higher than a fuel input weighted average heat exchanger efficiency of the fuel mixture.
2 more elements
A method of carrying out combustion in a furnace, comprising
- (A) combusting a fuel product in a furnace to produce gaseous combustion products, and
- (B) passing the gaseous combustion products from the furnace into a heat exchanger to transfer heat from said gaseous combustion products to a fuel mixture comprising (i) a first fuel that undergoes endothermic reactions with a heat recovery potential above 900° C. of greater than 100% and (ii) a second fuel that has a larger heat recovery potential below 900° C. than that of the first fuel, thereby cooling said gaseous combustion products and heating said fuel mixture to form said fuel product, and passing said fuel product into the furnace and combusting said fuel product in the furnace.
A method of carrying out combustion in a furnace, comprising
- (A) combusting a fuel product in a furnace to produce gaseous combustion products, and
- (B) alternately
- (1) passing the gaseous combustion products from the furnace into and through a cooled first regenerator to heat the first regenerator and cool said gaseous combustion products, and passing a fuel mixture comprising (i) one or more compounds that cannot react endothermically at a temperature below 1500 C and (ii) one or more compounds that can react endothermically at a temperature below 1500 C, into a heated second regenerator heated in step (2) and, in the second regenerator, heating said one or more compounds that cannot react endothermically at a temperature below 1500 C and said one or more compounds that can react endothermically at a temperature below 1500 C to form said fuel product comprising hydrogen, thereby cooling said second regenerator, and passing said fuel product from the second regenerator into the furnace and combusting the fuel product in the furnace, and
- (2) passing the gaseous combustion products from the furnace into and through said second regenerator cooled in step (1) to heat the second regenerator and cool said gaseous combustion products, and passing a fuel mixture comprising a mixture of (i) one or more compounds that cannot react endothermically at a temperature below 1500 C and (ii) one or more compounds that can react endothermically at a temperature below 1500 C, into said first regenerator heated in step (1) and, in the first regenerator, heating said one or more compounds that cannot react endothermically at a temperature below 1500 C and said one or more compounds that can react endothermically at a temperature below 1500 C, wherein the one or more of said compounds that can react endothermically at a temperature below 1500 C reacts in an endothermic reaction to form said fuel product comprising hydrogen, and passing said fuel product from the first regenerator into the furnace and combusting the fuel product in the furnace.
1 more element
Dependencies are inferred from the claim text.