2026-04-17T11:59:12Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1959522025-12-04T21:01:26Zcom_2072_1057col_2072_478796col_2072_478917

00925njm 22002777a 4500 dc Alarcón Avellán, Andreina author Busqué, Raquel author Andreu Arbella, Teresa author Guilera Sala, Jordi author 2023-03-24T14:12:36Z 2023-03-24T14:12:36Z 2022-09-01 2023-03-24T14:12:36Z A simple reactor design for the conversion of CO2 methanation into synthetic methane based on free convection is an interesting option for small-scale, decentralised locations. In this work, we present a heat-management design of a multi-tubular reactor assisted by CFD (Ansys Fluent®) as an interesting tool for scaling-up laboratory reactor designs. The simulation results pointed out that the scale-up of an individual reactive channel (d = 1/4′, H = 300 mm) through a hexagonal-shaped distribution of 23 reactive channels separated by 40 mm allows to obtain a suitable decreasing temperature profile (T = 487-230 °C) for the reaction using natural convection cooling. The resulting heat-management configuration was composed of three zones: (i) preheating of the reactants up to 230 °C, followed by (ii) a free-convection zone (1 m/s air flow) in the first reactor section (0-25 mm) to limit overheating and, thus, catalyst deactivation, followed by (iii) an isolation zone in the main reactor section (25-300 mm) to guarantee a proper reactor temperature and favourable kinetics. The evaluation of the geometry, reactive channel separation, and a simple heat-management strategy by CFD indicated that the implementation of an intensive reactor cooling system could be omitted with natural air circulation. Reactors químics Diòxid de carboni Metà Chemical reactors Carbon dioxide Methane Design of a Multi-Tubular Catalytic Reactor Assisted by CFD Based on Free-Convection Heat-Management for Decentralised Synthetic Methane Production