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A renewable approach to capture CO2 in Iran: thermodynamic and exergy analyses
Type Article
Solar-wind CO2 capturing · Zero energy system · Parabolic trough collector · Global warming mitigation
The significant potential of using wind energy, accessible energy of solar irradiation in large areas of Iran, and global warming challenges are the motivations to develop a solar-wind energy-based system for CO2 capturing. The innovative proposed system includes a chemical absorption-based process to capture CO2 from flue gas. The captured CO2 is liquefied by a solar absorption refrigeration process. The excessive heat of the exothermic chemical reactions provides the required heat of a Kalina cycle. The Kalina power cycle and a wind turbine rotor supply the required power of the CO2 removal system. Furthermore, parabolic trough collectors are also employed to provide the required heat of the refrigeration and separation systems. Ingoing mass and energy streams of the overall hybrid system are 50009 k mole h−1 flue gas and solar energy. Moreover, the outgoing stream is 4192 k mole h−1 liquid CO2 . The system is simulated aiming at Aspen HYSYS simulator and energy-exergy analyzed. The overall exergy efficiency of the system is 34.09%, and more than 78.87% of exergy is destroyed in re-boiler and towers by 43.32% and 35.55%, respectively. According to sensitivity analysis, local time, temperature and mass flow of lean amine, number of stripper trays, and the mass flow of flue gas affect optical efficiency of collectors, exergy destruction and efficiency rates of equipment, the energy consumption of the system, production rate of liquid CO2 and the number of parabolic trough collectors. Furthermore, the optimum altitude of the wind turbine installation is 50m . The required energy of the developed system is supplied by the sun and waste heat energy of the flue gas. Therefore, it is a zero energy system that captures CO2 and mitigates the harmful effects of global warming.
Researchers Bahram Ghorbani (First researcher) , Mehdi Mehrpooya (Second researcher) , Majid Aasadnia (Third researcher)