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US 6,200,128 B1Granted
Method and apparatus for recovering sensible heat from a hot exhaust gas
AssigneePraxair Technology, Inc.
InventorHisashi Kobayashi
Life of this patent
Estimating the term…
Abstract
A method and apparatus for recovering sensible heat from a hot exhaust gas having an oxygen concentration of less than 21 vol % in a fuel-air fired combustion device. An oxidant stream comprising a gas having an oxygen concentration of greater than 21 vol % is introduced into the combustion process to form an oxidant mixture comprising the hot exhaust gas, the oxidant and any air present, the mixture having an average combined oxygen concentration of less than 21 vol %.
Claims7
A method for recovering sensible heat from a hot exhaust gas, said method comprising:
- introducing fuel, air and hot exhaust gas having an oxygen content less than 21% by volume into a fuel-air combustion device;
- introducing into said combustion device an oxidant comprising a gas having an oxygen concentration greater than 21% by volume, to form an oxidant mixture in said combustion device having an average combined oxygen concentration of less than 21% by volume;
- and
- operating said combustion device at thermal conditions substantially equal to those achieved with air combustion of fuel in said combustion device, wherein the amount of fuel introduced into said combustion device is less than the amount of fuel used in said air combustion of fuel by an amount substantially equal in BTU content to the sensible heat of said hot exhaust gas as a result of recovery of sensible heal from said hot exhaust gas.
1 more element
Dependencies are inferred from the claim text.