PROCESS AND SYSTEM FOR REMOVING HYDROGEN SULFIDE AND MERCAPTANS IN AMMONIA-BASED DESULFURIZATION SYSTEMS
First Claim
1. A process of separating at least one of hydrogen sulfide and mercaptans from ammonia employed in a flue gas desulfurization system, the process comprising:
- absorbing acidic gases from a flue gas with a scrubbing media containing ammonium sulfate to produce a stream of scrubbed flue gas;
collecting the scrubbing media containing the absorbed acidic gases;
injecting into the collected scrubbing media a source of ammonia that is laden with at least one compound chosen from the group consisting of hydrogen sulfide and mercaptans, the injected ammonia being absorbed into and reacted with the collected scrubbing media;
stripping the at least one compound from the collected scrubbing media by causing the at least one compound to exit the collected scrubbing media as stripped gases; and
collecting the stripped gases of the at least one compound without allowing the stripped gases to enter the stream of scrubbed flue gas.
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Accused Products
Abstract
A flue gas desulfurization process and system that utilize ammonia as a reactant, and in which any hydrogen sulfide and/or mercaptans within the ammonia are separated during the desulfurization process so as to prevent their release into the atmosphere. The process and system entail absorbing acidic gases from a flue gas with a scrubbing media containing ammonium sulfate to produce a stream of scrubbed flue gas, collecting the scrubbing media containing the absorbed acidic gases, injecting into the collected scrubbing media a source of ammonia that is laden with hydrogen sulfide and/or mercaptans so that the injected ammonia is absorbed into and reacted with the collected scrubbing media, stripping the hydrogen sulfide and/or mercaptans from the collected scrubbing media by causing the hydrogen sulfide and/or mercaptans to exit the collected scrubbing media as stripped gases, and collecting the stripped gases without allowing the stripped gases to enter the stream of scrubbed flue gas.
15 Citations
20 Claims
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1. A process of separating at least one of hydrogen sulfide and mercaptans from ammonia employed in a flue gas desulfurization system, the process comprising:
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absorbing acidic gases from a flue gas with a scrubbing media containing ammonium sulfate to produce a stream of scrubbed flue gas; collecting the scrubbing media containing the absorbed acidic gases; injecting into the collected scrubbing media a source of ammonia that is laden with at least one compound chosen from the group consisting of hydrogen sulfide and mercaptans, the injected ammonia being absorbed into and reacted with the collected scrubbing media; stripping the at least one compound from the collected scrubbing media by causing the at least one compound to exit the collected scrubbing media as stripped gases; and collecting the stripped gases of the at least one compound without allowing the stripped gases to enter the stream of scrubbed flue gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19)
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20. A flue gas desulfurization system comprising:
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means for absorbing acidic gases from a flue gas with a scrubbing media containing ammonium sulfate to produce a stream of scrubbed flue gas; means for collecting the scrubbing media containing the absorbed acidic gases; means for injecting into the collected scrubbing media a source of ammonia that is laden with at least one compound chosen from the group consisting of hydrogen sulfide and mercaptans, the injected ammonia being absorbed into and reacted with the collected scrubbing media; means for stripping the at least one compound from the collected scrubbing media by causing the at least one compound to exit the collected scrubbing media as stripped gases; and means for collecting the stripped gases of the at least one compound without allowing the stripped gases to enter the stream of scrubbed flue gas.
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Specification