Abstract
Oxygen transport membranes are a possible low-cost alternative to cryogenic air separation units or pressure swing adsorption for oxygen production, and could facilitate carbon capture by oxy-fuel combustion processes. In this work, a proof-of-concept module with 7 ceramic tubular membranes was designed and tested in a high pressure test stand. To ensure high oxygen production rates, asymmetric membranes with a length of 70 cm consisting of a porous Ba0.5Sr0.5(Co0.8Fe0.2)0.97Zr0.03O3-δ support and a dense Ba0.5Sr0.5(Co0.8Fe0.2)0.97Zr0.03O3-δ thin separation layer were used. The module was successfully operated at up to 5.4 bar for 280 h in a temperature range from 650 °C to 850 °C. Oxygen purities up to 96.5% and flow rates up to 6.2 ml/cm2/min were measured, and a total maximum oxygen production of 227 NLPH was demonstrated.
Highlights
Carbon capture, utilization and storage (CCUS) [1,2,3,4,5,6,7] can be a part of the solution to address climate change and global warming
All tubes were individually characterized at temperatures between 650 ◦C and 850 ◦C
A long-term test was carried out for 175 h to evaluate the stability of the BSCF3Zr tubes over time
Summary
Utilization and storage (CCUS) [1,2,3,4,5,6,7] can be a part of the solution to address climate change and global warming. In this process carbon dioxide (CO2) emissions from point sources, such as steelworks, cement production or power plants, can be captured and used for the production of synthetic fuels and chemicals, or stored un derground, where the CO2 is trapped and cannot re-enter the atmosphere. Oxy-fuel combustion is a CCS process which is able to save energy accompanied by a decrease of the CO2 amount generated [13,14]
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