STUDY ON KINETICS OF HYDROGEN PRODUCTION FROM DISTRIBUTED METHANOL REFORMING AND REACTOR INTENSIFICATION

Abstract

Abstract: A dual-rate kinetic model of power function type was obtained based on the SR-DE mechanism and the intrinsic kinetic data. It was revealed that the methanol cracking reaction was kinetic-control, while the methanol steam reforming reaction was diffusion-control within the process conditions studied according to the analysis of internal diffusion influences. Optimizing the pellet size could enhance the mass transfer within the pellets, thereby effectively improve the apparent activity of the catalyst. Multi-physical field simulations of a single-tube methanol reforming reactor were carried out by using COMSOL Multiphysics 6.1. To discuss the matching of process conditions, catalysts and reactor structure, the performances of the methanol-reforming reactor with different catalyst activities were simulated under the same structure and process conditions. Optimizing the reactor tube structure could enhance the heat transfer process, improve heating efficiency, reduce bed temperature difference, and significantly improve catalyst utilization efficiency and device energy efficiency.

Key words: methanol reforming, catalyst, internal diffusion, reactor simulation, process enhancement

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