System for recovering hydrogen sulfide

The utility model provides a system which is low in comprehensive operation cost and energy consumption and is mainly used for recovering hydrogen sulfide from lean sulfuric acid gas, relates to the technical field of hydrogen sulfide purification, and comprises a hydrogen sulfide absorption tower, a flash tank, a hydrogen sulfide regeneration tower, a first heat exchanger, a second heat exchanger, a condenser, a gas-liquid separation tank and a storage tank, the rich liquid outlet is connected with a feed port of a flash tank through a first pump, a first heat exchanger and a second heat exchanger in sequence, and a liquid outlet in the bottom of the flash tank is connected with a feed port of a hydrogen sulfide regeneration tower through a second pump; a tower top gas outlet of the hydrogen sulfide regeneration tower is connected with a feeding hole of the gas-liquid separation tank through a cooling medium inlet of the first heat exchanger, a cooling medium outlet of the first heat exchanger, a feeding hol