Thermodynamic and experimental analysis of chemical looping dry reforming with hydrogen production system

A chemical chain methane dry reforming combined hydrogen production process was proposed. The process consists of a reduction reactor, a dry reforming reactor, a steam reactor and an air reactor to obtain a synthesis gas having a variable H2/CO ratio while achieving hydrogen production. In this study, thermodynamic validation was carried out at 900℃ and 1.01×105 Pa, and experiments were performed to verify the feasibility of the process in a fluidized-bed reactor using Fe2O3/Al2O3 oxygen carrier. It was found that a high conversion of CO2 and CH4 to syngas can be achieved on the reduced iron oxygen carrier. When the reduction extent of the oxygen carrier was 33%, the CH4 conversion and CO yield over 98% and 94%, respectively. During the dry reforming stage, the ratio of CH4/CO2 was variable. Partial oxidation of excess CH4 by active lattice oxygen increased H2/CO molar ratio of syngas and reduced the carbon deposition. Carbon deposition formed since the active lattice oxygen has been depleted, which would react with steam in the next steam oxidizer and causing the hydrogen purity reduced. © All Right Reserved.