Flue Gas Scrubbing with Aqueous Ammonia
First Claim
1. An apparatus for removing carbon dioxide from a gas comprising:
- a. a two-part gas scrubber comprised of an absorber and a gas water washer;
b. a two-part regenerator comprised of a reboiled desorber and a CO2 water washer;
c. a two-part stripper comprised of a reboiled water reclaimer and an ammonia reclaimer;
d. a circulation path for carbon dioxide scrubbing liquid between said absorber and said desorber; and
e. a circulation path for wash water between said water reclaimer and said water wash contactor and water wash column.
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Accused Products
Abstract
A system for scrubbing acid gases from a gas stream, and particularly adapted for scrubbing CO2 from flue gas and recovering the CO2 at high pressure and good purity using an aqueous scrubbing medium such as aqueous ammonia scrubbing solution. A scrubber, regenerator, and stripper are provided, with each having two parts that are each multistage countercurrent vapor-liquid contactors. The required compression energy is minimized by providing necessary refrigeration from an ammonia absorption refrigeration plant that is powered by heat extracted from the gas being scrubbed. The amount of reboil required for the regenerator and stripper is minimized by providing internal heat exchangers (non-adiabatic distillation) in those components.
16 Citations
20 Claims
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1. An apparatus for removing carbon dioxide from a gas comprising:
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a. a two-part gas scrubber comprised of an absorber and a gas water washer; b. a two-part regenerator comprised of a reboiled desorber and a CO2 water washer; c. a two-part stripper comprised of a reboiled water reclaimer and an ammonia reclaimer; d. a circulation path for carbon dioxide scrubbing liquid between said absorber and said desorber; and e. a circulation path for wash water between said water reclaimer and said water wash contactor and water wash column. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for regenerating a liquid scrubbing medium for scrubbing acid gas, comprising a trayed reboiled stripping column with internal heat exchangers on at least some of said trays, plus a liquid flowpath for withdrawing the regenerated scrubbing liquid from the bottom of said stripper through said heat exchangers.
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12. An apparatus for reclaiming washing liquid used in an acid gas scrubbing process, comprising a trayed reboiled stripping column with internal heat exchangers on at least some of said trays, plus a liquid flowpath for withdrawing the reclaimed washing liquid from the bottom of said stripper through said heat exchangers.
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13. An apparatus for scrubbing CO2 from flue gas comprising a chilled scrubbing medium;
- an ammonia absorption chilling plant for supplying chilling to said medium;
plus a means for transferring heat from said flue gas to said ammonia absorption chilling plant for powering said chilling plant.
- an ammonia absorption chilling plant for supplying chilling to said medium;
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14. An apparatus for condensing pressurized CO2 recovered from a flue gas CO2 recovery apparatus comprising:
- a refrigerated condenser for said pressurized CO2;
an ammonia absorption refrigeration plant for supplying refrigeration to said condenser;
plus a means for transferring heat from said flue gas to said ammonia absorption refrigeration plant for powering said refrigeration plant.
- a refrigerated condenser for said pressurized CO2;
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15. A process for scrubbing CO2 from combustion gas comprising:
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a. contacting said gas sequentially in a multistage absorber followed by a multistage washer; b. circulating a CO2 scrubbing medium between said absorber and a reboiled desorber; and c. transferring heat inside said desorber between bottom liquid and desorbing liquid. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification