氨生產對全球二氧化碳排放的重要性不可忽視，其佔全球化石燃料消耗的1.8%以上，超過全球總排放量的1%。該排放的主要來源是使用化石燃料作為氫氣生產的原料。為了應對這個問題，需要開發能夠減少碳排放的替代過程。
本研究著重於氨生產領域，探討了兩種較為乾淨的氫氣生產過程，即鹼性水電解和生物質氣化，作為產氨廠之氫氣來源製程。在本研究中，利用低溫空氣分離過程獲取氮氣，並使用哈伯法製氨，將目標產量設定為每年生產10萬噸。本研究透過Aspen Plus 建構出產氨廠之模型，並與其他文獻進行比較，藉此確認模型之準確性，並對這兩個架構的經濟可行性和環境影響進行了比較，而在環境層面藉由SimaPro®進行分析。架構1對環境衝擊較小，由於利用電解水提供合成氨所需之氫氣，且電力皆使用綠電，而架構2則具有較高的經濟效益，架構2的淨現值為51.09 M$，預計回本期為6.7年，內部報酬率為15.1%。這項研究結果提供了產氨廠減少碳排放的重要指引，同時也為氨生產領域的經濟效益和環境可持續性提供了有價值的參考。

Ammonia production is a significant contributor to global carbon dioxide emissions, accounting for over 1.8% of global fossil fuel consumption and exceeding 1% of total global emissions. The main source of carbon emissions is due to the use of fossil fuels as raw materials for hydrogen production. To address this, alternative processes that mitigate carbon emissions must be explored. This study considers two cleaner hydrogen production processes, alkaline water electrolysis and biomass gasification, as alternatives to reduce carbon emissions in ammonia production. Cryogenic air separation process is utilized to obtain nitrogen gas, while the Haber-Bosch process is employed to synthesize ammonia, focusing on a target ammonia production of 100,000 tons per annum. Their economic feasibilities and environmental impacts are also compared in this paper. Scenario 1 has a smaller environmental impact, while Scenario 2 yields higher economic benefits. The net present value of Scenario 2 is $51.09 million, with an estimated payback period of 6.7 years and an internal rate of return of 15.1%.

[1] I. Capellán-Pérez, M. Mediavilla, C. de Castro, Ó. Carpintero, and L. J. Miguel, "Fossil fuel depletion and socio-economic scenarios: An integrated approach," Energy, vol. 77, pp. 641-666, 2014, doi: 10.1016/j.energy.2014.09.063.
[2] N. Muradov and T. Veziroglu, "“Green” path from fossil-based to hydrogen economy: An overview of carbon-neutral technologies," International Journal of Hydrogen Energy, vol. 33, no. 23, pp. 6804-6839, 2008, doi: 10.1016/j.ijhydene.2008.08.054.
[3] DEMACO. "Hydrogen transportation: three well-known energy carriers compared." (accessed.
[4] A. O. Gezerman, "Exergy analysis and purging of an ammonia storage system," Int. J. Exergy, vol. 17, 2015.
[5] H. Ishaq and I. Dincer, "Design and simulation of a new cascaded ammonia synthesis system driven by renewables," Sustainable Energy Technologies and Assessments, vol. 40, 2020, doi: 10.1016/j.seta.2020.100725.
[6] M. Wang et al., "Can sustainable ammonia synthesis pathways compete with fossil-fuel based Haber–Bosch processes?," Energy & Environmental Science, vol. 14, no. 5, pp. 2535-2548, 2021, doi: 10.1039/d0ee03808c.
[7] L. Ye, R. Nayak-Luke, R. Bañares-Alcántara, and E. Tsang, "Reaction: “Green” Ammonia Production," Chem, vol. 3, no. 5, pp. 712-714, 2017, doi: 10.1016/j.chempr.2017.10.016.
[8] Z. A. M. Khalel, A. A. Rabah, and T. A. M. Barakat, "A New Cryogenic Air Separation Process with Flash Separator," ISRN Thermodynamics, vol. 2013, pp. 1-4, 2013, doi: 10.1155/2013/253437.
[9] "Air separation plants," in "linde-engineering " Linde Aktiengesellschaft, 2019.
[10] R. Cornelissen and G. Hirs, "Exergy analysis of cryogenic air separation," Energy Conversion and Management, vol. 39, no. 16-18, pp. 1821-1826, 1998.
[11] V. M. Avargani, S. Zendehboudi, N. M. C. Saady, and M. B. Dusseault, "A comprehensive review on hydrogen production and utilization in North America: Prospects and challenges," Energy Conversion and Management, vol. 269, p. 115927, 2022.
[12] W. Balthasar, "Hydrogen production and technology: today, tomorrow and beyond," International Journal of Hydrogen Energy, vol. 9, no. 8, pp. 649-668, 1984.
[13] J. D. Holladay, J. Hu, D. L. King, and Y. Wang, "An overview of hydrogen production technologies," Catalysis today, vol. 139, no. 4, pp. 244-260, 2009.
[14] H. L. Chen, H. M. Lee, S. H. Chen, Y. Chao, and M. B. Chang, "Review of plasma catalysis on hydrocarbon reforming for hydrogen production—interaction, integration, and prospects," Applied Catalysis B: Environmental, vol. 85, no. 1-2, pp. 1-9, 2008.
[15] B. Ćosić, G. Krajačić, and N. Duić, "A 100% renewable energy system in the year 2050: The case of Macedonia," Energy, vol. 48, no. 1, pp. 80-87, 2012.
[16] A. Demirbaş, "Biomass resource facilities and biomass conversion processing for fuels and chemicals," Energy conversion and Management, vol. 42, no. 11, pp. 1357-1378, 2001.
[17] A. Flamos, P. Georgallis, H. Doukas, and J. Psarras, "Using biomass to achieve European Union Energy Targets—A review of biomass status, potential, and supporting policies," International Journal of Green Energy, vol. 8, no. 4, pp. 411-428, 2011.
[18] P. Parthasarathy and K. S. Narayanan, "Hydrogen production from steam gasification of biomass: influence of process parameters on hydrogen yield–a review," Renewable energy, vol. 66, pp. 570-579, 2014.
[19] C. E. Bamberger and D. M. Richardson, "Hydrogen production from water by thermochemical cycles," Cryogenics, vol. 16, no. 4, pp. 197-208, 1976.
[20] I. Garagounis, V. Kyriakou, A. Skodra, E. Vasileiou, and M. Stoukides, "Electrochemical synthesis of ammonia in solid electrolyte cells," Frontiers in Energy Research, vol. 2, p. 1, 2014.
[21] J. R. Bartels, A feasibility study of implementing an Ammonia Economy. Iowa State University, 2008.
[22] B. Parkinson et al., "Hydrogen production using methane: Techno-economics of decarbonizing fuels and chemicals," International Journal of Hydrogen Energy, vol. 43, no. 5, pp. 2540-2555, 2018.
[23] K. Kevin Breen, "Energy technology prospectives, pathways to a clean energy system," Paris: International Energy Agency, 2012.
[24] R. Turton, R. C. Bailie, W. B. Whiting, and J. A. Shaeiwitz, Analysis, synthesis and design of chemical processes. Pearson Education, 2008.
[25] C. E. magazine. (2022) Chemical Engineering Plant Cost Index.
[26] ""How to depreciate property," American department of treasury, vol. 946, 2016. Department of the Treasury,Internal Revenue Service."
[27] T. Brown, Engineering economics and economic design for process engineers. CRC press, 2016.
[28] 王松岭, 张学镭, 陈海平, and 周兰欣, "基于深冷技术的空气分离系统仿真研究," 华北电力大学学报, vol. 33, no. 1, pp. 64-66, 2006.
[29] A. Ebrahimi, M. Meratizaman, H. A. Reyhani, O. Pourali, and M. Amidpour, "Energetic, exergetic and economic assessment of oxygen production from two columns cryogenic air separation unit," Energy, vol. 90, pp. 1298-1316, 2015.
[30] A. Ebrahimi, M. Meratizaman, H. Akbarpour Reyhani, O. Pourali, and M. Amidpour, "Energetic, exergetic and economic assessment of oxygen production from two columns cryogenic air separation unit," Energy, vol. 90, pp. 1298-1316, 2015, doi: 10.1016/j.energy.2015.06.083.
[31] L. Van der Ham and S. Kjelstrup, "Exergy analysis of two cryogenic air separation processes," Energy, vol. 35, no. 12, pp. 4731-4739, 2010.
[32] M. Sánchez, E. Amores, D. Abad, L. Rodríguez, and C. Clemente-Jul, "Aspen Plus model of an alkaline electrolysis system for hydrogen production," International Journal of Hydrogen Energy, vol. 45, no. 7, pp. 3916-3929, 2020, doi: 10.1016/j.ijhydene.2019.12.027.
[33] M. Sanchez, E. Amores, L. Rodriguez, and C. Clemente-Jul, "Semi-empirical model and experimental validation for the performance evaluation of a 15 kW alkaline water electrolyzer," International Journal of Hydrogen Energy, vol. 43, no. 45, pp. 20332-20345, 2018.
[34] L. M. Gandia, G. Arzamendi, and P. M. Diéguez, Renewable hydrogen technologies: production, purification, storage, applications and safety. Newnes, 2013.
[35] Ø. Ulleberg, "Modeling of advanced alkaline electrolyzers: a system simulation approach," International journal of hydrogen energy, vol. 28, no. 1, pp. 21-33, 2003.
[36] E. Amores, J. Rodríguez, J. Oviedo, and A. de Lucas-Consuegra, "Development of an operation strategy for hydrogen production using solar PV energy based on fluid dynamic aspects," Open Engineering, vol. 7, no. 1, pp. 141-152, 2017.
[37] F. Le Coultre, "Utilisation of Heat Released During the Production of Green Hydrogen Using Alkaline Electrolysis," 2022.
[38] R. García-Valverde, N. Espinosa, and A. Urbina, "Simple PEM water electrolyser model and experimental validation," international journal of hydrogen energy, vol. 37, no. 2, pp. 1927-1938, 2012.
[39] A. Ursúa, L. Marroyo, E. Gubía, L. M. Gandía, P. M. Diéguez, and P. Sanchis, "Influence of the power supply on the energy efficiency of an alkaline water electrolyser," international journal of hydrogen energy, vol. 34, no. 8, pp. 3221-3233, 2009.
[40] V. Marcantonio, M. De Falco, M. Capocelli, E. Bocci, A. Colantoni, and M. Villarini, "Process analysis of hydrogen production from biomass gasification in fluidized bed reactor with different separation systems," International Journal of Hydrogen Energy, vol. 44, no. 21, pp. 10350-10360, 2019, doi: 10.1016/j.ijhydene.2019.02.121.
[41] C. Franco, F. Pinto, I. Gulyurtlu, and I. Cabrita, "The study of reactions influencing the biomass steam gasification process☆," Fuel, vol. 82, no. 7, pp. 835-842, 2003.
[42] M. Moneti, A. Di Carlo, E. Bocci, P. Foscolo, M. Villarini, and M. Carlini, "Influence of the main gasifier parameters on a real system for hydrogen production from biomass," International Journal of Hydrogen Energy, vol. 41, no. 28, pp. 11965-11973, 2016.
[43] X. Sun, S. Li, and J. Lei, "An ensemble method for multiple source images fusion in smart city," in 2017 29th Chinese Control And Decision Conference (CCDC), 2017: IEEE, pp. 3967-3972.
[44] V. Pallozzi, A. Di Carlo, E. Bocci, M. Villarini, P. Foscolo, and M. Carlini, "Performance evaluation at different process parameters of an innovative prototype of biomass gasification system aimed to hydrogen production," Energy Conversion and Management, vol. 130, pp. 34-43, 2016.
[45] S. Rajabi Hamedani, M. Villarini, A. Colantoni, M. Moretti, and E. Bocci, "Life Cycle Performance of Hydrogen Production via Agro-Industrial Residue Gasification—A Small Scale Power Plant Study," Energies, vol. 11, no. 3, 2018, doi: 10.3390/en11030675.
[46] M. J. Prins, K. J. Ptasinski, and F. J. Janssen, "From coal to biomass gasification: Comparison of thermodynamic efficiency," Energy, vol. 32, no. 7, pp. 1248-1259, 2007.
[47] I. Aspen Technology, "Aspen Plus Ammonia Model."
[48] H. Baris, M. Glinski, J. Kijenski, A. Wokaun, and A. Baiker, "Ammonia synthesis over alumina and magnesia supported ruthenium: Comparative kinetic study of the promotive action of metallic and ionic potassium," Applied catalysis, vol. 28, pp. 295-301, 1986.
[49] "<green-ammonia-policy-briefing.pdf>," The Royal Society, 2020.
[50] W. D. Seider, D. R. Lewin, J. Seader, S. Widagdo, R. Gani, and K. M. Ng, Product and process design principles: synthesis, analysis, and evaluation. John Wiley & Sons, 2017.
[51] R. Singla and K. Chowdhury, "Comparisons of thermodynamic and economic performances of cryogenic air separation plants designed for external and internal compression of oxygen," Applied Thermal Engineering, vol. 160, p. 114025, 2019.
[52] P. C. Wankat and K. P. Kostroski†, "Hybrid Air Separation Processes for Production of Oxygen and Nitrogen," Separation Science and Technology, vol. 45, no. 9, pp. 1171-1185, 2010, doi: 10.1080/01496391003745728.
[53] W. Alkhayat and A. Gerrard, "Estimating manning levels for process plants," AACE Transactions, vol. 1, pp. 2.1-2.4, 1984.
[54] Y.-X. CHEN, "Energy conservation and environmental protection," BUSINESS NEXT, 2020. [Online]. Available: https://www.bnext.com.tw/article/57815/taipower-sell-green-power-problem.
[55] B. Lee et al., "Integrative techno-economic and environmental assessment for green H2 production by alkaline water electrolysis based on experimental data," Journal of Environmental Chemical Engineering, vol. 9, no. 6, 2021, doi: 10.1016/j.jece.2021.106349.
[56] Y. K. Salkuyeh, B. A. Saville, and H. L. MacLean, "Techno-economic analysis and life cycle assessment of hydrogen production from different biomass gasification processes," International Journal of Hydrogen Energy, vol. 43, no. 20, pp. 9514-9528, 2018.
[57] Z. He, M. H. Sahraei, and L. A. Ricardez-Sandoval, "Flexible operation and simultaneous scheduling and control of a CO2 capture plant using model predictive control," International Journal of Greenhouse Gas Control, vol. 48, pp. 300-311, 2016.
[58] A. Gerrard, Guide to capital cost estimating. IChemE, 2000.
[59] J. Castro, J. Leaver, and S. Pang, "Simulation and Techno-Economic Assessment of Hydrogen Production from Biomass Gasification-Based Processes: A Review," Energies, vol. 15, no. 22, 2022, doi: 10.3390/en15228455.
[60] H. T. Luk, H. M. Lei, W. Y. Ng, J. Yihan, and K. F. Lam, "Techno-economic analysis of distributed hydrogen production from natural gas," Chinese Journal of Chemical Engineering, vol. 20, no. 3, pp. 489-496, 2012.
[61] R. Davis, J. Markham, C. Kinchin, N. Grundl, E. C. Tan, and D. Humbird, "Process design and economics for the production of algal biomass: algal biomass production in open pond systems and processing through dewatering for downstream conversion," National Renewable Energy Lab.(NREL), Golden, CO (United States), 2016.
[62] (2023). How To Depreciate Property.
[63]B.Analytiq."Ammoniapriceindex."https://businessanalytiq.com/procurementanalytics/index/ammonia-price-index/ (accessed.
[64] D. S. t. a. P. Sustainability, "SimaPro database manual Methods library," 2022.
[65] M. Tao, W. Cheng, K. Nie, X. Zhang, and W. Cao, "Life cycle assessment of underground coal mining in China," Science of The Total Environment, vol. 805, p. 150231, 2022.