基于生命周期评估的中国氨合成的和碳足迹
Yifei Li1, Zongyue Zhang2, Qingrui Wang3
1School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China; State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China.
Journal of environmental management
|September 3, 2023
概括
氨的合成显著破坏了全球循环. 以可再生能源为动力的电解提供了最低的和碳足迹,而基于生物质的氨造成了最大的环境干扰.
科学领域:
- 地球系统科学 地球系统科学
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 全球 (N) 循环受到人类活动的严重破坏,特别是人工反应性 (Nr) 生产,氨 (NH3) 合成是主要的驱动因素.
- 现有的NH3合成生命周期评估往往忽略了循环的影响,并且缺乏对-碳足迹联系的全面分析.
- 中国的背景被用来评估七个NH3合成系统,考虑不同的原材料路径和生产技术.
研究的目的:
- 为七个氨合成系统建立生命周期评估模型.
- 量化和分析每个系统的足迹,碳足迹 (CF) 和它们之间的联系.
- 确定环境热点和影响氨合成影响的关键因素.
主要方法:
- 利用Brightway2平台开发生命周期评估模型.
- 使用足迹会计总框架 (GFNFA) 来评估整个生态圈的足迹.
- 系统量化和分析气排放,碳排放以及-碳关系.
主要成果:
- 以可再生能源或核能为动力的电解氨气显示出最低的活性 (Nr) 排放量 (0.499-1.148公斤Nr/t NH3) 和碳排放量 (592.822-1045.494公斤CO2-eq/t NH3).
- 基于生物质的氨显示了最高的Nr排放和积,导致由于资源消耗和直接的Nr排放,对循环造成了最严重的干扰.
- 能源消耗被确定为和碳足迹的共同驱动因素,NH3合成效率是最关键的因素,减少了超过12.5%的足迹,效率增加了15%.
结论:
- 氨合成系统对和碳循环的生命周期影响很大,需要仔细考虑.
- 转向可再生能源和提高合成效率对于减轻生产氨的环境足迹至关重要.
- 本研究提供了对各种氨合成途径的和碳足迹的全面了解,有助于可持续的工业实践.
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