DESULFURIZATION OF, AND REMOVAL OF CARBON DIOXIDE FROM, GAS MIXTURES
First Claim
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1. A process for desulfurization of, and removal of carbon dioxide from, gas mixtures, comprising the steps of:
- (a) contacting in a desulfurization stage a flue gas comprising SO2 with a scrubbing liquor comprising an alkaline compound and, optionally, with oxidation air, to remove SO2 from the flue gas;
(b) contacting in a carbon dioxide absorption stage a second gas stream comprising CO2 with an absorption liquid comprising ammonia, to remove CO2 from the second gas stream;
(c) subjecting the scrubbing liquid, the flue gas or the oxidation air to heat exchange, in a heat exchanger, with used absorption liquid resulting from step (b), to heat the used absorption liquid; and
(d) regenerating the absorption liquid by releasing CO2 from the heated used absorption liquid resulting from step (c).
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Abstract
A method of heating a used absorption liquid resulting from a carbon dioxide absorption stage in which a CO2 comprising gas stream is contacted with an absorption liquid comprising ammonia, wherein the used absorption liquid is subjected to heat exchange, in a heat exchanger, with a fluid of a desulfurization stage in which a SO2 comprising flue gas is contacted with a reagent composition comprising an alkaline compound.
57 Citations
29 Claims
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1. A process for desulfurization of, and removal of carbon dioxide from, gas mixtures, comprising the steps of:
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(a) contacting in a desulfurization stage a flue gas comprising SO2 with a scrubbing liquor comprising an alkaline compound and, optionally, with oxidation air, to remove SO2 from the flue gas; (b) contacting in a carbon dioxide absorption stage a second gas stream comprising CO2 with an absorption liquid comprising ammonia, to remove CO2 from the second gas stream; (c) subjecting the scrubbing liquid, the flue gas or the oxidation air to heat exchange, in a heat exchanger, with used absorption liquid resulting from step (b), to heat the used absorption liquid; and (d) regenerating the absorption liquid by releasing CO2 from the heated used absorption liquid resulting from step (c). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for desulfurization of, and removal of carbon dioxide from, gas mixtures, comprising a desulfurization system comprising
a desulfurization vessel for contacting a flue gas with a scrubbing liquor; -
a withdrawal circuit arranged to withdraw scrubbing liquor from the desulfurization vessel, a gas conduit arranged to supply the flue gas to the desulfurization vessel; and optionally, an air conduit arranged to supply oxidation air to the desulfurization vessel; and a carbon dioxide removal system comprising a CO2 absorber for contacting a second gas stream with an absorption liquid, the CO2 absorber having an inlet for absorption liquid and an outlet for used absorption liquid; and a regenerator for regenerating the absorption liquid by release of CO2 from used absorption liquid, the regenerator having an inlet for used absorption liquid and an outlet for regenerated absorption liquid, wherein the outlet for used absorption liquid of the CO2 absorber and the inlet for used absorption liquid of the regenerator are operatively connected via a heat exchanger, the heat exchanger further being operatively arranged in the desulfurization system. - View Dependent Claims (9, 10, 11, 13, 14)
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15. A process for desulfurization of, and removal of carbon dioxide from, gas mixtures, comprising the steps of:
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(a) preparing a reagent mixture by combining lime and water, to obtain a solution of slaked lime, and mixing the solution of slaked lime with a particulate, to obtain a reagent mixture; (b) contacting in a desulfurization stage a flue gas comprising SO2 with the reagent mixture, to remove SO2 from the flue gas; (c) contacting in a carbon dioxide absorption stage a gas stream comprising CO2 with an absorption liquid comprising ammonia, to remove CO2 from the gas stream; (d) subjecting the solution of slaked lime or the flue gas to heat exchange, in a heat exchanger, with used absorption liquid resulting from step (c), to heat the used absorption liquid; and (e) regenerating the absorption liquid by releasing CO2 from the heated used absorption liquid resulting from step (d). - View Dependent Claims (16, 17, 18)
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19. A system for desulfurization of, and removal of carbon dioxide from, gas mixtures, comprising a desulfurization system comprising
a slaker adapted for preparation of slaked lime and arranged to receive lime and water; -
a feed circuit adapted for storage and supply of slaked lime and arranged to receive slaked lime from the slaker; a mixer adapted for preparation of a reagent mixture and arranged to receive slaked lime from the feed circuit; a desulfurization vessel adapted for contacting a flue gas with a reagent mixture and arranged to receive a reagent mixture from the mixer; and a gas conduit arranged to supply the flue gas to the desulfurization vessel, and a carbon dioxide removal system comprising a CO2 absorber for contacting a gas stream with an absorption liquid, the CO2 absorber having an inlet for absorption liquid and an outlet for used absorption liquid; and a regenerator for regenerating the absorption liquid by release of CO2 from used absorption liquid, the regenerator having an inlet for used absorption liquid and an outlet for regenerated absorption liquid, wherein the outlet for used absorption liquid of the CO2 absorber and the inlet for used absorption liquid of the regenerator are operatively connected via a heat exchanger, the heat exchanger further being operatively arranged in the desulfurization system. - View Dependent Claims (20, 21, 22)
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- 23. A method of heating a used absorption liquid resulting from a carbon dioxide absorption stage in which a CO2 comprising gas stream is contacted with an absorption liquid comprising ammonia, wherein the used absorption liquid is subjected to heat exchange, in a heat exchanger, with a fluid of a desulfurization stage in which a SO2 comprising flue gas is contacted with a reagent composition comprising an alkaline compound.
Specification