Utah State researchers are linking small modular reactors with ammonia plants to cut emissions from fertilizer production.
Ammonia production is one of the most energy-intensive chemical processes in the world. It feeds the fertilizer market that supports billions of people, but carries a heavy climate cost.Now, researchers in the U.
S. are exploring how small modular nuclear reactors could change that picture by powering next-generation, carbon-free ammonia plants.Reports suggest that more than 40 percent of global hydrogen production goes into ammonia. Fertilizers such as urea and ammonium nitrate consume nearly 80 percent of that ammonia. The result is significant emissions.Current methods, which rely on natural gas steam reforming, are responsible for 2 percent of global fossil energy use and about 1.2 percent of greenhouse gas emissions. With demand expected to grow as populations rise, cutting the sector’s carbon footprint is becoming urgent.SMRs offer stable powerSmall modular reactors are being positioned as an answer to the ammonia industry’s challenges. Unlike wind or solar, SMRs provide reliable baseload power and heat.They can be built close to consumption centers, avoiding transportation emissions tied to centralized plants. They also make it possible to co-locate hydrogen and nitrogen production with ammonia synthesis, boosting efficiency and cutting costs.The new project, funded by the U.S. Department of Energy’s Nuclear Energy University Program and led by Utah State University researchers, aims to create two reference designs for carbon-free ammonia plants.One design uses freshwater to supply hydrogen. The other adapts to seawater or brackish water sources by including desalination. Both rely on the NuScale SMR, rated at 250 MW thermal and 77 MW electric output, as the core energy source.To generate hydrogen, the system employs high-temperature steam electrolysis. This approach reduces electricity demand by using reactor heat to provide the vaporization energy.Integrating the exothermic Haber-Bosch process with electrolysis further raises system efficiency, since waste heat from compressors and ammonia synthesis can preheat feedwater.Designs tested for efficiencyResearchers modeled three system configurations using Aspen Plus to evaluate energy flows. Each design tested different methods of preheating the electrolysis feedwater.Case 1 diverted steam from the SMR along with the hydrogen product heat. Case 2 added ammonia product heat and an electric heater. Case 3 captured waste heat from multi-stage compressors and the ammonia product stream.The third configuration proved most productive. With more reactor power feeding electrolysis, it delivered the highest ammonia output. By turning waste heat into useful energy, the design made better use of the SMR’s output and cut the need for external heating.Next steps include optimizing each system at the unit and plant level, followed by techno-economic analysis. The team also plans to integrate freeze desalination and ice energy storage for plants using seawater.The goal is to demonstrate how SMR-powered ammonia plants can operate with zero carbon emissions while delivering competitive costs.If successful, the designs could help decarbonize a sector that sits at the foundation of global food supply.With stable nuclear energy feeding ammonia production, fertilizers could move closer to a carbon-neutral future.
Carbon-Free Ammonia Haber-Bosch Process High-Temperature Steam Electrolysis Hydrogen Electrolysis Nuclear Energy Small Modular Reactors SMR
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