Investigation of a renewable energy based integrated system with carbon capturing for hydrogen, methane and other useful outputs

This study introduces the design of a solar and wind-based novel multigeneration system capable of storing thermal energy. The proposed system can simultaneously capture carbon dioxide from a steel production facility while producing electrical power, space heating, methane, hydrogen gas, and freshwater. As it is a well-known fact that steel production contributes substantially to global carbon dioxide emissions, the design of a cleaner system, which can reduce or eliminate these emissions, is badly needed. The offshore wind power generates hydrogen gas through polymer electrolyte membrane electrolysis. After that, a portion of the hydrogen generated is reacted with the captured carbon dioxide to produce methane/natural gas. The system's hydrogen and methane production rates are 0.01835 kgs  1 and 0.03649 kgs  1, respectively. The electrical power generated by the system is primarily from wind turbines and the integration of a solar-based multi-stage Rankine cycle. The net electrical power generated by the system and the freshwater production rate are 3.28 MW and 1 kgs  1, respectively. Furthermore, the proposed system can produce 207.2 kW of space heating. Additionally, the pro-posed multigeneration system has the overall energy and exergy efficiencies of 43.14% and 22.67%, respectively.