TY - EJOU
AU - Sorimachi, Kenji
AU - Tsukada, Toshinori
AU - Gabbar, Hossam A.
TI - Sustainable Circulating Energy System for Carbon Capture Usage and Storage (CCUS)
T2 - Energy Engineering
PY - 2025
VL - 122
IS - 6
SN - 1546-0118
AB - Recently, we developed an innovative CO2 capture and storage method based on simple chemical reactions using NaOH and CaCl2. In this technology, it was newly found that the addition of CO2 gas produced CaCO3 (limestone) in the solution of NaOH and CaCl2 at less than 0.2 N NaOH, while at more than 0.2 N NaOH, Ca(OH)2 formation occurred merely without CO2. The present study has been designed to develop an integrated system in which the electrolysis unit is combined with the CO2 fixation unit. As the electrolysis of NaCl produces simultaneously not only electricity but also H2 and Cl2, the produced H2 could be supplied to the hydrogen generator to produce further electricity, which could be used for the initial NaCl electrolysis for NaOH production. Contrarily, the combination of incinerators with electrolytic generators has already been established to supply electricity, as thermal power plants use coals or wastes. This electricity-providing unit could be replaced with a solar panel plant or with a storage buttery. The present integrated system, consisting of various electricity-providing methods and CO2 fixation units, is a sustainable circulating energy system and carbon capture, usage, and storage (CCUS) system without environmental concerns. In addition, an unexpected-tremendous amount of the burned wood, which was produced by the big mountain or forest fires, could be disposed of by our integrated CO2 fixing system with the incinerator without environmental concerns along with both H2 and CaCO3 productions. Thus, our simple technology must contribute immediately and economically to disaster recovery.
KW - CO2 fixation; CO2 storage; circular energy system; climate change; limestone (CaCO3); electrolysis; CCUS; SDGs; sustainability
DO - 10.32604/ee.2025.064975