Modeling Thermal Part of Sulfur Recovery Unit and Simulation Based Analysis of Effects of Air Temperature on Entire Plant

Sulfur in feedstocks are increasing steadily. Consequently, changes in regulations force industrial companies to operate Sulfur Recovery Units more efficiently. An industrial Sulfur Recovery Unit of TUPRAS, Turkey was modelled by Matlab by using simplified kinetics. Proposed model was validated with the industrial data of TUPRAS. The model represents the important species with minute deviation. According to the model proposed, conversion and recovery were found to be 65.24% and 86.88%, respectively; where they were calculated to be 64.91% and 82.72% in design case. Moreover, effects of air temperature were studied in this work. According to the simulation results, up to $13,200/year can be saved by removing preheating. Because carbon content is essential in gas mixture, effects of COS and CS 2 on catalytic part after this modification are found to be negligible in short term. This design change also increases the sulfur production by about 600 kg/day. On the other hand, amount of COS, CS 2 , H 2 S released from Selective Oxidation Reactor would be enhanced from 25 to 31 ppmmol, which increase overall SO 2 emission from incinerator.