Process for acid gas treatment and power generation

A method, comprising:

• receiving an acid gas stream and calcium oxide at a fuel reactor of an acid gas treatment unit, the acid gas stream comprising hydrogen sulfide;
• operating the fuel reactor to react the hydrogen sulfide with calcium oxide to produce calcium sulfide and a first gas stream comprising water vapor and carbon dioxide;
• operating an oxidizer reactor of the acid gas treatment unit to receive the calcium sulfide and a first air stream to produce calcium sulfate and an oxygen-lean second air stream, the oxygen-lean air stream comprising no more than 15% by weight oxygen;
• and
• operating a calciner reactor to receive the oxygen-lean air stream and calcium carbonate and produce the calcium oxide and a second gas stream, the second gas stream comprising carbon dioxide.

A system, comprising:

• an acid gas treatment unit operable to treat an acid gas stream comprising hydrogen sulfide, the acid gas treatment unit comprising:
• a fuel reactor operable to receive the acid gas stream and calcium carbonate, the fuel reactor further operable to:
• produce carbon dioxide and calcium oxide from the calcium carbonate;
• and
• react the hydrogen sulfide with the calcium oxide to produce calcium sulfide and a first gas stream comprising water vapor and carbon dioxide;
• and
• an oxidizer reactor operable to receive the calcium sulfide and a first air stream, the oxidizer reactor further operable to produce calcium sulfate and an oxygen-lean second air stream, the oxygen-lean air stream comprising no more than 15% by weight oxygen.

A method, comprising:

• receiving an acid gas stream and calcium carbonate at a fuel reactor of an acid gas treatment unit, the acid gas stream comprising hydrogen sulfide;
• operating the fuel reactor to produce carbon dioxide and calcium oxide from the calcium carbonate and react the hydrogen sulfide with the calcium oxide to produce calcium sulfide and a first gas stream comprising water vapor and carbon dioxide;
• and
• operating an oxidizer reactor of the acid gas treatment unit to receive the calcium sulfide and a first air stream to produce calcium sulfate and an oxygen-lean second air stream, the oxygen-lean air stream comprising no more than 15% by weight oxygen.