Eco-friendly hydrogen and power co-production system with a flexible operational strategy

Abstract

Reducing the cost of clean hydrogen production is essential to combat global warming and advance the hydrogen economy. Integrating water electrolysis with complementary systems offers a promising approach to developing a hybrid hydrogen production framework. Therefore, this study aims to propose a hydrogen and power coproduction system with a flexible operational strategy to reduce hydrogen production costs. This system operates through the integration of a proton exchange membrane electrolysis cell system with an Allam cycle for power generation. Additionally, it produces hydrogen through water electrolysis during off-peak periods and generates power using the Allam cycle during peak periods, adapting to fluctuations in electricity supply and demand. It demonstrates an energy efficiency of 56.24 % under standard design conditions and achieves up to 57.87 % efficiency when the water electrolyzer capacity is enhanced. Furthermore, it exhibits operational flexibility during both off-peak and peak periods, optimizing economic benefits. Economic analysis revealed a net present value of $626.4 million and an internal rate of return of 14.3 %. Finally, the system produces minimal carbon dioxide emissions, underscoring its significant environmental benefits. The proposed hydrogen and power co-production system is expected to contribute to the economic viability of clean hydrogen production and supports the hydrogen economy, establishing a foundation for eco-friendly energy systems.