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A method and system for removing hydrogen sulfide from a hot gas. In a moving bed absorber, sulfur compounds in the hot gas moving in a direction which is countercurrent to the direction of movement of the movable bed of metal oxide, react with metal oxide to form metal sulfide. The metal sulfide is

A method and system for removing hydrogen sulfide from a hot gas. In a moving bed absorber, sulfur compounds in the hot gas moving in a direction which is countercurrent to the direction of movement of the movable bed of metal oxide, react with metal oxide to form metal sulfide. The metal sulfide is regenerated to re-usable metal oxide in a moving bed regenerator. The regeneration is carried out with an oxygen-containing gas in which regenerator off-gas serves as a diluent to control oxygen concentration. In the regenerator, spent metal sulfide moves progressively through a single regeneration vessel having first, second and third regeneration stages. In the first and second regeneration stages, first and second oxygen and sulfur dioxide-containing gases move, respectively, in a direction which is cocurrent with the direction of movement of a movable bed of spent metal sulfide. In the third regeneration stage, an oxygen-containing gas moves in a direction which is countercurrent to the direction of movement of the movable bed of metal sulfide from the second regeneration stage. The combined gases derived from the first, second and third regeneration stges and which are rich in sulfur dioxide and lean in oxygen, are removed from the regenerator as off-gas and used as diluent with air, oxygen-enriched air or pure oxygen to provide the low oxygen concentration in the oxygen-containing gas introduced into the first and second regeneration stages.

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A method for removing hydrogen sulfide and other sulfur compounds from a hot gas consisting essentially of the steps of: (a) contacting the hot gas with at least one metal oxide sorbent in a packed, non-fluidized bed of metal oxide sorbent which moves countercurrently to the hot gas, whereby the met

A method for removing hydrogen sulfide and other sulfur compounds from a hot gas consisting essentially of the steps of: (a) contacting the hot gas with at least one metal oxide sorbent in a packed, non-fluidized bed of metal oxide sorbent which moves countercurrently to the hot gas, whereby the metal oxide sorbent reacts with the hydrogen sulfide and other sulfide compounds to form a sulfur-rich metal sorbent and a hot gas lean in sulfur compounds; (b) removing the hot gas lean in sulfur from the bed of metal oxide sorbent; (c) contacting the sulfur-rich metal sorbent with a first oxygen-containing gas which moves non-fluidized bed of the sulfur-rich metal sorbent in a first phase regeneration to convert sulfur-rich metal sorbent to a partially-sulfided sorbent, thereby forming a sulfur dioxide containing gas; (d) contacting the partially-sulfided metal sorbent with a second oxygen-containing gas which moves co-currently in the direction of a movable, packed, non-fluidized bed of the partially-sulfided metal sorbent in a second phase regeneration to convert the partially-sulfided metal sorbent to regenerated metal oxide and thereby forming additional sulfur dioxide-containing gas, the first oxygen-containing gas having a concentration of oxygen which is less than the concentration of oxygen in the second oxygen-containing gas; (e) contacting the regenerated metal oxide with air, oxygen-enriched air or oxygen which moves countercurrently to the direction of a movable, packed, non-fluidized bed of the regenerated metal oxide to convert any remaining sulfided metal sorbent to regenerated metal oxide, to cool the regenerated metal oxide or to purge the regenerated metal oxide of sulfur dioxide-containing gas; (f) removing the sulfur dioxide-containing gas purged from the regenerated metal oxide; and (g) re-using the regenerated metal oxide in step (a).