Decarbonizing the Fertilizers Sector for Urea and Nitric Acid

This technical report discusses the decarbonization of the nitrogen fertilizers sector, focusing on urea and nitric acid production. It outlines the integration of two fertilizer production plants into a kraft pulp mill through black liquor gasification, aiming to reduce the environmental impact of nitrogen fertilizers. The report assesses the performance of these integrated systems based on thermodynamic, economic, and environmental indicators. It highlights the competitive exergy efficiency of the integrated plants compared to conventional kraft pulp mills, driven by optimal operating conditions. The findings indicate potential atmospheric CO2 depletion and positive net present values across various carbon tax scenarios, suggesting economic viability. The report emphasizes the importance of integrating biorefineries into existing facilities to enhance sustainability and efficiency in the chemical sector. Additionally, it discusses the challenges and opportunities associated with biomass-derived syngas for ammonia production, which is critical for fertilizer manufacturing. The analysis includes techno-economic evaluations and the implications of carbon taxes on the decarbonization efforts.