Abstract
We report the development of technology that may contribute to a reduction in greenhouse gas emissions and improve the energy efficiency of the CO2 capture process. Lithium ortho-silicate is a suitable solid sorbent for capturing CO2. This reversible chemical reaction is also applicable to chemical heat storage. The absorption reaction characteristics of lithium ortho-silicate were studied by a thermogravimetric method and a volumetric method that demonstrated the influence of heat and mass transfer limitations in a packed bed designed to be as small as possible. We developed a method for measuring the absorption reaction characteristics in the experiments. In the experiments, a constant conversion fraction of 60% was observed. The reaction system was stable to repetition. The CO2 absorption rate depends on the CO2 pressure and reactor temperature. The absorption rate was determined at several reactor temperatures when the conversion fraction was 0.3. In this study, the maximum absorption rate was obtained at 670oC. It was demonstrated that lithium ortho-silicate is suitable for use in a chemical heat storage system.
Highlights
The global issue of climate change has received ever increasing attention, with the development of methods for reduction of CO2 emissions from industrial processes being one of the main focuses
The absorption reaction characteristics of lithium ortho-silicate were studied by a thermogravimetric method and a volumetric method that demonstrated the influence of heat and mass transfer limitations in a packed bed designed to be as small as possible
It was demonstrated that lithium ortho-silicate is suitable for use in a chemical heat storage system
Summary
The global issue of climate change has received ever increasing attention, with the development of methods for reduction of CO2 emissions from industrial processes being one of the main focuses. The process with the potential to make a significant impact on emissions is carbon capture and storage (CCS). The CO2 separation process accounts for ~60% of the energy consumption. In CO2 separation technology, zeolite, aminebased materials, magnesium and calcium oxides, and lithium-based oxide sorbents have been developed. Lithium ortho-silicate has potential for CO2 capture capacity, and desorbs at a lower temperature than with MgO and CaO [4] [5]. The lithium ortho-silicate reaction formula is as follow: Li4SiO4 [s] + CO2 [g] ↔ Li2SiO3 [s] + Li2CO3 [s]
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