No abstract

Thermochemical energy storage (TcES) system using lithium orthosilicate/carbon dioxide (Li 4 SiO 4 /CO 2) reaction was developed for recovery and utilization of high temperature thermal energy generated from high temperature industrial process. Li 4 SiO 4 /CO 2 TcES packed bed reactor (LPR) and zeolite packed bed reactor (ZPR) were developed as thermal energy storage and CO 2 reservoir. Both reactors, LPR and ZPR, were connected by flexible tube and thermal driving operation of TcES system was demonstrated. For lithium orthosilicate packed bed reactor, tablet forms of Li 4 SiO 4 named K-tablet was developed and used in this study. Li 4 SiO 4 carbonation (thermal energy output process) and lithium carbonate (Li 2 CO 3) decarbonation (thermal energy storage process) were conducted sequentially with specific condition. All experimental results showed similar tendency; a middle temperature in the Li 4 SiO 4 packed bed reactor rapidly increased and decreased at the initial time of carbonation and decarbonation respectively. From kinetic analysis, it was confirmed that the developed K-tablet reacted around 80% and a thermal energy output density of LPR was estimated 331-395 kJ/L-packed bed, 759-904 kJ/L-material. The thermal driving demonstration of Li 4 SiO 4 /CO 2 /Zeolite TcES system shows high possibility to utilize surplus heats in low-carbon ironmaking system efficiently.

No abstract