A kind of system and method for sulfide hydrogen conversion gas purification

The invention provides a kind of system and method for sulfide hydrogen conversion gas purification, the pressure potential of carbon dioxide, hydrogen sulfide gas decompression process in conversion gas in purification process is effectively utilized while conversion gas purification is completed, corresponding mechanical energy is exported to the external world, reduces the energy expenditure in purification process.Described system includes the pipeline of drive train, heat transmission equipment, hydrogen sulfide absorption tower, knockout drum, the valve of process control and each equipment of connection, and drive train therein includes compressor, expanding machine, generator and control compressor, the valve of expander pressure.The core of the present invention is the carbon dioxide in cryogenic liquefaction separation conversion gas and removes the hydrogen sulfide in conversion gas by the use of separating obtained liquid CO 2 as the absorbent of hydrogen sulfide stripping in conversion gas, and carbon dioxide provides corresponding freezing cold from high pressure into low pressure conversion process by the external output mechanical energy of expander acting and for system in conversion gas.