(205c) Cost-Effective Technology Identification & Uncertainty Quantification of Stranded Sour Gas Desulfurization Processes
AIChE Annual Meeting
2020
2020 Virtual AIChE Annual Meeting
Topical Conference: Next-Gen Manufacturing
Process Intensification and Modular Manufacturing: Modeling and Simulation
Wednesday, November 18, 2020 - 8:30am to 8:45am
In this work, different natural gas desulfurization processes, e.g., SourCat® [1], iron-chelate redox systems LO-CAT® [2], Claus [3], and Triazine based scavenger [4] are simulated at different scales (1 to 1,000 MMSCFD) and inlet H2S concentrations (500 to 2,500 ppm). For each combination of operating conditions, the desulfurization cost, which is defined as the net present value during the life period of the desulphurization system, is calculated for each process. The process with the lowest desulfurization cost is identified for each operating condition. This information is used to generate a map that envelopes the operating conditions of the cost-competitive processes. From our initial analysis, we found that the newly developed oxidative sulfur removal (OSR) SourCat® process is a viable and cost-competitive option for stranded gas sweetening in the wide range of 3,000 MSCFD to 75 MMSCFD at 500 to 2,000 ppm H2S concentration, among the processes that were compared. Triazine based scavenger process becomes cost-effective at a lower flow rate (3,000 MSCFD) and low H2S concentrations. In contrast, the Claus process is efficient at a much higher flowrate (45,000 MMSCFD) or higher H2S concentrations.
The desulfurization cost depends on solvents, catalysts, equipment costs, electricity costs, and fuel costs. Of the parameters that impact desulfurization cost, solvent cost, catalyst cost, capital investment cost and fuel cost are most uncertain. A systematic sensitivity analysis was performed to identify the significant parameters to understand the impact of these uncertainties on the desulfurization cost and the resulting map of the operational envelope, specifically focusing on the boundaries. Then, the uncertainties of the significant parameters were propagated to estimate the uncertainty of desulfurization cost for each process. These estimates allowed us to update the map to include transition boundaries where there may be more than one process that is cost-competitive.
References:
- âSour Gas Has a Sweeter Future,â Chemical Engineering Progress, January 2017 https://www.aiche.org/sites/default/files/cep/20170112.pdf
- âRemoving H2S from Gas Streamsâ, https://www.merichem.com/technology/sulfur-recovery-with-lo-cat/?doing_wp_cron=1588006246.7422919273376464843750
- âSteady State Simulation and Optimization of an Integrated Gasification Combined Cycle (IGCC) Plant with CO Capture,â Bhattacharyya, D., R. Turton, and S. E. Zitney, Ind. Eng. Chem. Res. 50 (2011): 1674â1690.
- âHydrolysis of 1,3,5-Tris(2-hydroxyethyl)hexahydro- s -triazine and Its Reaction with H 2 Sâ. Bakke, J.M.; Buhaug, J.; Riha, J. Ind. Eng. Chem. Res. 2002, 40, 6051â6054.
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