In this study, thermal coupling of chemical looping combustion (CLC) and dry reforming of methane (DR) via employment of Fe45-Al 2 O 3 and Mn40/Mg-ZrO 2 oxygen carriers (OCs) were investigated. The main aim of this configuration (CLC-DR) is the prevention of large CO 2 emissions to the atmosphere by CLC and simultaneous consumption of the captured gas to synthesis gas through a DR reaction. For this purpose, a steady state one-dimensional heterogeneous catalytic reaction model is applied to analyze the performance and applicability of the proposed CLC-DR configuration using both OCs. Simulation results indicate that for both OCs, combustion efficiency reaches 1 in the fuel reactor (FR) of CLC-DR. Additionally, results illustrate that CH 4 conversion in the DR side of CLC-DR reaches 0.7235 and 0.7213 with Fe45-Al 2 O 3 and Mn40/Mg-ZrO 2 OCs respectively.Results show that application of CLC-DR employing Fe45-Al 2 O 3 and Mn40/Mg-ZrO 2 OCs produces 8611 and 8585 kmol h À1 of synthesis gas, respectively. Synthesis gases with H 2 /CO mole ratios of 0.9519 and 0.9612 are achieved using Fe45-Al 2 O 3 and Mn40/Mg-ZrO 2 OCs respectively. In addition, results demonstrate that by increasing the feed temperature of CLC-DR from 800 to 1000 K, synthesis gas production reaches 11 210 and 11 340 kmol h À1 when using Fe45-Al 2 O 3 and Mn40/Mg-ZrO 2 , respectively.Finally, thermal and molar behaviours of CLC-DR configuration indicate that it is applicable, and by utilization of this configuration 547.8 tonne day À1 can be captured and converted to synthesis gas.
Applicability of using Dry Reforming of Methane (DRM) using low-cost Ni-based catalysts instead of Conventional Steam Reformers (CSR) to producing syngas simultaneously with reducing the emission of carbon dioxide was studied. In order to achieving this goal, a multi-tubular recuperative thermally coupled reactor which consists of two-concentric-tubes has been designed (Thermally Coupled Tri- and Dry Reformer [TCTDR]). By employing parameters of an industrial scale CSR, two proposed configuration (DRM with fired-furnace and Tri-Reforming of Methane (TRM) instead of fired-furnace (TCTDR)) was simulated. A mathematical heterogeneous model was used to simulate proposed reactors and analyses were carried out based on methane conversion, hydrogen yield and molar flow rate of syngas for each reactor. The results displayed methane conversion of DRM with fired-furnace was 35.29% and 31.44% for Ni–K/CeO2–Al2O3 and Ni/La2O3 catalysts, respectively, in comparison to 26.5% in CSR. Methane conversion in TCTDR reached to 16.98% by Ni/La2O3 catalyst and 88.05% by NiO–Mg/Ce–ZrO2/Al2O3 catalyst in TRM side. Also, it was 15.88% using Ni–K/CeO2–Al2O3 catalyst in the DRM side and 88.36% using NiO–Mg/Ce–ZrO2/Al2O3 catalyst in TRM side of TCTDR. Finally, the effect of different amounts of supplying energy on the performance of DRM with fired-furnace was studied, and positive results in reducing the energy consumption were observed.
In this study, a steady-state heterogeneous one-dimensional model predicts the performance of a thermally double coupled auto-thermal multi-tubular reactor for simultaneous production of hydrogen, benzene, methanol and dimethyether (DME) in an economical approach for both co- and counter- current modes of operation. Reversed flow of cyclohexane has been considered for the counter-current flow regime. The simulation results for co- and counter-current modes have been investigated and compared with corresponding predictions for conventional methanol reactor and traditional coupled methanol reactor. In addition, various operating parameters along the reactor have been studied. The simulation results present that methanol yield in co- and counter- current modes are reached to 0.3735 and 0.3363 in a thermally double coupled reactor, respectively. Also, results for counter-current mode show a superior performance in hydrogen and benzene production. Finally, the results of simulation illustrate that the coupling of these reactions could be beneficial.
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