International Science and Technology Journal

The solar hybrid sulfur cycle (Shysc) operates at a high temperature for hydrogen production, with thermal energy losses. This study aims to utilize waste heat for power production. A cogeneration system for power and hydrogen production has been developed. (Shysc) is considered and integrated with the Kalina cycle (KC) to utilize thermal energy for power production. The system utilizes the (Shysc) waste heat recovered to run the (KC). The developed integrated system produces 0.101 kg/s H2 and 0.802 kg/s O2 with an overall process thermal efficiency of 18% based on the hydrogen lower heating value. The study also shows that the net power produced by the KC is 68.36 MJ/kgH2, with a thermal efficiency of 7%. The low efficiency is mainly due to the relatively large amount of consumed heat in the sulfur dioxide gas separation, which reached 778.25MW/kgH2. This thermal energy is used in the SO2 separation process, where not all of the sulfur dioxide reacts with water inside the electrochemical analyser, but only 40% of it reacts with water to produce hydrogen. Despite the low efficiency of the system, hydrogen and power can be produced simultaneously. The system efficiency can be enhanced by developing the electrochemical analyser performance. Moreover, the thermal system efficiency can be improved by employing a power thermal cycle that is more efficient than the (KC). Keywords: Hydrogen Production, Hybrid Sulfur Cycle, Kalina Cycle, Thermal Efficiency, Electrochemical Performance.