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• W3205948067 endingPage "114838" @default.
• W3205948067 startingPage "114838" @default.
• W3205948067 abstract "• Comprehensive parametric study of membrane integrated reforming reactor (MRR) • Sweeping steam on the permeate side increases H 2 recovery and CH 4 conversion. • Flow direction of permeate had no effect on CH 4 conversion or H 2 recovery. • Longer reactor length results in better CH 4 conversion and H 2 recovery. • Retentate side high pressures decreases CH 4 conversion but increases H 2 permeation. • Optimum performance requires moderate retentate pressure and steam sweeping. Steam-methane reforming is the primary method for industrial hydrogen production. High energy consumption and elevated greenhouse gas (GHG) emissions call for a significant improvement in the reforming process for optimum methane conversion and hydrogen production. Enhanced fuel conversion also produces more CO 2 than CO, making the carbon capture process easier, consequently reducing harmful emissions. In this work, a membrane-integrated reformer reactor (MRR) has been investigated through an experimentally validated computational fluid dynamics (CFD) model using ANSYS-Fluent. The MRR model constitutes of Ni-based catalyst filled reforming zone, Pd-based hydrogen-selective membrane, and permeate zone for hydrogen recovery. The developed model has been examined for several parameters including steam-to-methane ratio, flow rate, sweeping conditions, flow direction, reformer pressure and membrane length. The results indicated a substantial increase in methane conversion with a higher steam-to-carbon (S/C) ratio for a given feed flow rate. The methane conversion increased from 34% to 63% when the S/C ratio is increased from 2 to 6 at a methane mass flow rate of 0.0018 kg/s. The results also indicate an increase in hydrogen recovery with the decrease in feed flow rate for a fixed steam-to-methane ratio. Hydrogen recovery decreased from 28% to 2% when the mass flow rate of methane is increased from 5 × 10 -5 kg/s to 1.8 × 10 -3 kg/s, at a fixed S/C of 4. The incorporation of sweeping steam demonstrated a significant improvement in hydrogen recovery increasing from 15% to 33% with a sweep flow rate equal to the feed flow rate and methane mass flow rate of 1.8 × 10 -4 kg/s. Further increase in sweep flow rate showed very small increase in hydrogen recovery, therefore in order to minimize the use of sweeping steam, a sweeping steam flow rate equal to the feed flow rate is suggested. Furthermore, flow direction, reformer pressure and membrane length were also found to play vital role in MRR performance." @default.
• W3205948067 created "2021-10-25" @default.
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• W3205948067 date "2021-12-01" @default.
• W3205948067 modified "2023-10-11" @default.
• W3205948067 title "Comprehensive parametric investigation of methane reforming and hydrogen separation using a CFD model" @default.
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• W3205948067 doi "https://doi.org/10.1016/j.enconman.2021.114838" @default.
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