Numerical modeling of high-temperature shell-and-tube heat exchanger and chemical decomposer for hydrogen production

Abstract

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High Temperature Energy Storage Performances of Methane Reforming with Carbon Dioxide in Tubular Packed Reactor

“…Huang et al [5] investigated CH 4 /CO 2 reforming performances over SBA-15 supported Ni-Mo bimetallic catalysts using a fixed-bed quartz reactor. Based on available experimental results, the local mass and heat transfer of methane reforming in the packed reactor have been numerically calculated [6][7][8].…”

Numerical study of heat transfer and sulfuric acid decomposition in the process of hydrogen production

“…In the heating section, the sulfuric acid temperature rises rapidly due to the helium gas heating. The temperature exceeds 900 K before the flow enters the reaction zone in the porous region, where the sulfuric acid is assumed to be completely vaporized and decomposed into sulfur trioxide and water . In the decomposition section, the sulfuric acid core temperature reached 1040 K due to the reactions in the porous medium and the heating of the high‐temperature helium gas, indicating that the present design makes full use of the heat in the helium gas to provide good conditions for the sulfuric acid decomposition reaction.…”

“…Choi and Choi simulated the sulfuric acid decomposition efficiency for various pressures to find the best equilibrium conversion rate to improve the system design flexibility. Kuchi et al used the porous media method to study a shell‐and‐tube model with counter flow and parallel flow arrangements and simple uniform cubic packing to discuss the effects of various parameters on the sulfur trioxide decomposition. Shin et al designed semipilot scale H 2 SO 4 and HI decomposers that were coupled with an external helium gas supply to obtain the convective heat transfer coefficient and the sulfuric acid decomposition efficiency distributions.…”

High temperature energy storage performances of methane reforming with carbon dioxide in a tubular packed reactor

“…Guo and Ren [19] simulated the heat transfer and chemical reaction in a 120-sphere random packed bed, and the inhomogeneity of flow and heat transfer was discussed due to the nonuniform distribution of void fraction. There are also many reaction models achieved for reaction systems such as combustion of methane and partial oxidation of methane [20][21][22][23]. Kumar et al [24] developed a one-dimensional nonisothermal model for an oxygen permeable membrane reactor to simulate the partial oxidation of methane to produce hydrogen.…”