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US 10,689,254 B1Granted
Methods for SO2 recoveries from sulfur plants
OwnerMahin Rameshni, Stephen L. Santoinventors
Life of this patent
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Abstract
A method and system for abating the emissions of at least sulfur dioxide present in a tail gas emitted from sulfur recovery units are provided. The invention is characterized by the provision of at least two adsorber units in a parallel arrangement. While one adsorber is in an adsorption mode, it receives a gas contaminated w/ sulfur dioxide and adsorbs and removes the sulfur dioxide out of the gas. The other adsorber is in regeneration mode, and receives an acid gas stream comprising hydrogen sulfide as well as an oxygen-containing gas to regenerate the spent adsorbent material and produce an off-gas comprising hydrogen sulfide and sulfur dioxide. This off-gas is then recycled back to the sulfur recovery unit.
Claims20
A method for abating the emissions of at least sulfur dioxide present in gases emitted from sulfur recovery plants, comprising:
- providing at least one first adsorber unit that operates in an adsorption mode to sorb and remove at least the sulfur dioxide out of a tail gas containing sulfur dioxide, and also providing at least one other second adsorber unit that operates in a regeneration mode that receives an acid gas slip stream comprising hydrogen sulfide and also an oxygen-containing gas so as to desorb at least the sulfur dioxide from this said at least one other second adsorber unit to produce a regeneration gas comprising at least sulfur dioxide and hydrogen sulfide, wherein the first and second adsorber units are configured such that these first and second adsorber units are alternately switched between an adsorption mode and a regeneration mode;
- passing a tail gas comprising sulfur dioxide through the at least one first adsorber unit so as to sorb and remove the sulfur dioxide out of this tail gas while passing an acid gas slip stream comprising hydrogen sulfide and also an oxygen-containing gas through the at least one other second adsorber unit to regenerate this second adsorber unit and provide an off-gas comprising sulfur dioxide and hydrogen sulfide;
- discharging the gas emitted from the at least one first adsorber unit through a stack or a vent, and recycling the off-gas emitted from the at least one second adsorber unit back to a sulfur recovery unit;
- and
- switching the mode of operation of the said at least first adsorber unit so that it receives an acid gas slip stream comprising hydrogen sulfide and also an oxygen-containing gas and is regenerated, and switching the mode of operation of the said at least second adsorber unit so that it receives a tail gas comprising sulfur dioxide and removes at least the sulfur dioxide out of this tail gas, wherein the adsorbent material within the at least one first adsorber unit and/or the at least one second adsorber unit is selected from the group consisting of alumina catalyst, activated alumina catalyst, alumina/titania catalyst, titania catalysts, iron with nickel, chromium, cobalt with molybdenum, molybdenum, manganese, cobalt, and one or more combinations thereof.
2 more elements
A system for abating the emissions of at least sulfur dioxide present in gases emitted from sulfur recovery plants, comprising:
- at least one first adsorber unit that operates in an adsorption mode to sorb and remove at least the sulfur dioxide out of a tail gas containing sulfur dioxide, and also at least one other second adsorber unit that operates in a regeneration mode that receives an acid gas slip stream comprising hydrogen sulfide and also an oxygen-containing gas so as to desorb at least the sulfur dioxide from this said at least one other second adsorber unit to produce a regeneration gas comprising at least sulfur dioxide and hydrogen sulfide, wherein the first and second adsorber units are configured such that these first and second adsorber units are alternately switched between an adsorption mode and a regeneration mode;
- means for passing a tail gas comprising sulfur dioxide through the at least one first adsorber unit so as to sorb and remove the sulfur dioxide out of this tail gas while passing an acid gas slip stream comprising hydrogen sulfide and also an oxygen-containing gas through the at least one other second adsorber unit to regenerate this second adsorber unit and provide an off-gas comprising sulfur dioxide and hydrogen sulfide;
- means for discharging the gas emitted from the at least one first adsorber unit through a stack or a vent, and recycling the off-gas emitted from the at least one second adsorber unit back to a sulfur recovery unit;
- and
- means for switching the mode of operation of the said at least first adsorber unit so that it receives an acid gas slip stream comprising hydrogen sulfide and also an oxygen-containing gas and is regenerated, and switching the mode of operation of the said at least second adsorber unit so that it receives a tail gas comprising sulfur dioxide and removes at least the sulfur dioxide out of this tail gas, wherein the adsorbent material within the at least one first adsorber unit and/or the at least one second adsorber unit is selected from the group consisting of alumina catalyst, activated alumina catalyst, alumina/titania catalyst, titania catalysts, iron with nickel, chromium, cobalt with molybdenum, molybdenum, manganese, cobalt, and one or more combinations thereof.
2 more elements
Dependencies are inferred from the claim text.