Simulations of sorbent regeneration in a circulating fluidized bed system for sorption enhanced steam reforming with dolomite

Publication date: Available online 11 November 2019Source: ParticuologyAuthor(s): Kiattikhoon Phuakpunk, Benjapon Chalermsinsuwan, Sompong Putivisutisak, Suttichai AssabumrungratAbstractIn this work, the sorption enhanced steam reforming (SESR) method was developed for improved hydrogen (H2) production, and the drawbacks of conventional steam reforming processes on H2 yield and purity were overcome. However, the SESR process is discontinuous and requires regeneration after sorbent saturation with CO2. The circulating fluidized bed reactor (CFBR) system has previously been proposed for continuous H2 production, with both reforming and sorbent regeneration occurring simultaneously. The main aim of this work was to determine the feasibility and performance of SESR with a proper design and conditions in conjunction with the CFBR system. The reforming riser and bubbling bed regenerator are studied separately but related to each other. Two-dimensional transient models using the Euler‒Euler approach and kinetic theory of granular flow were used for fluid dynamic simulations combined with the decarbonation kinetics of dolomite, to investigate a conceptual regenerator system and determine its key conditions. A mixture of the Ni-based catalyst and dolomite from the risers was injected with a flux of 200 kg/(m2 s) and a catalyst to sorbent ratio of 2.54 kg/kg. A double-stage bubbling bed regenerator system was designed with 1.2 m width, 0.8 m bed height, a gas...

Source: Particuology - November 12, 2019 Category: Science Source Type: research