Correlating the Influence of the Purity of Hydrogen Produced by a Surplus Power on the Production of Green Ammonia

Abstract

Carbon dioxide is the primary greenhouse gas contributing to climate change. Furthermore, due to the surplus power generated by renewable energy resources, various approaches have been developed to handle this overproduction. This study verifies via a correlation analysis the influence of the purity of hydrogen produced by a continuous surplus power on sustainable ammonia production. The influence of the temperature and pressure of the hydrogen treatment system on the purity of the hydrogen gas produced in the alkaline water electrolysis system was investigated, where the purity increased with a decrease in temperature and an increase in pressure. The purity of the produced ammonia was positively correlated with the purity of hydrogen. Furthermore, the energy consumption of the ammonia production process increased when the purity of hydrogen was low. In the case of storing the surplus power as ammonia, the effect of hydrogen purity was less affected by the hydrogen production system than by the ammonia production system, and it was thus concluded that it is more desirable to determine the hydrogen purity in the hydrogen production system prior to employing it in the ammonia production system.