Abstract: With the in-depth development of deep-sea oil and gas fields in recent years, there are more and more H2S-containing oil and gas. Considering the requirements of health of production personnel, environmental protection and corrosion protection of facilities, it is imperative to deal with H2S. The relevant system and process have not been used in domestic offshore facilities before, and the reliability and adaptability need to be verified, especially in cylindrical FPSO with random shaking direction. 
The OR-GREEN sulfur recovery system was used for the first time in a cylindrical FPSO. In the case of strong wind and waves at sea and severe swaying of FPSO, the oil-gas treatment reactor of OR-GREEN sulfur recovery system will also sway, which may cause the gas-liquid two-phase flow bias in the reactor, affect the reaction and mass transfer time, and further affect the effect of natural gas desulfurization treatment. In this paper, the gas-liquid two-phase flow in a reactor under wind and wave conditions is simulated by Ansys Fluent software. Through simulation, it is verified that the designed structure will not affect the normal operation of the system under the once-a-year wind and wave conditions, and the designed OR-GREEN system can resist the once-a-year wind and wave conditions.

Key words: sulfur recovery system, H2S acid gas, sway