Abstract

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.

Highlights

  • Hydrogen is a main raw material for chemical industries such as oil refining industries, production of ammonia, dimethyl ether, methanol, or aniline [1,2,3,4]

  • In this research in comparison to previous research, two proposed configuration was simulated including utilizing of fired-furnace for Dry Reforming of Methane (DRM) and employing Tri-Reforming of Methane (TRM) for heat supplying and effect of different amount of supplying energy on performance of DRM process with fired-furnace was studied

  • This figure indicates that the temperature profile of Steam Reforming of Methane (SRM) is higher than DRM due to the DRM process is more endothermic than Conventional Steam Reformers (CSR)

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Summary

Introduction

Hydrogen is a main raw material for chemical industries such as oil refining industries, production of ammonia, dimethyl ether, methanol, or aniline [1,2,3,4]. Natural gas is known as the cleanest fossil fuel, and methane steam reforming is a traditional, and most prevalent procedure for the production of syngas, but high energy consumption in the low-performance fired-furnace and high H2/CO ratio are drawbacks of steam reforming [9, 13, 17]. Dry reforming of methane is a procedure that converts CH4 and CO2 to worthful products as CO and H2 that are named synthesis gas [17, 21,22,23] These below reactions occur during DRM: CH4 þ CO2 2CO þ 2H2 ÁH 1⁄4 247:3 kJ=mol: ð1Þ. Amount of supplying energy on performance of DRM process with fired-furnace was studied

Process description
Dry reforming of methane side reactions
Tri-reforming side reaction
5.43 Â 105 barÀ1
Modeling
Balance equations for solid phase
Balance equation for fluid phase
Pressure drop
Auxiliary correlations
Numerical solution
Simulation of DRM with fired-furnace
Dry reforming simulation with utilizing TRM instead of fired-furnace in TCTDR
Heat generation effect on DRM performance with utilizing fired-furnace
Conclusion
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