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整合大型CO2/CO电还原工厂的过程建模和技术经济分析,以生产C2+产品
Asvin Sajeev1, Matthijs Kroes2, Isabell Bagemihl2
1Department of Process & Energy, Faculty of Mechanical Engineering, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands.
概括
工业CO2/CO电还原到C2+产品需要上游清洁以去除催化剂毒素. 一个大规模的工艺模型显示,利能力取决于电解剂性能的提高,成本的降低和有利的市场条件.
科学领域:
- 电化学和催化剂的使用.
- 化学工程和过程建模的化学工程和过程建模.
- 可持续能源和碳利用利用
背景情况:
- 工业来源的二氧化碳 (CO2) 和一氧化碳 (CO) 原料含有杂质 (SOx,NOx,H2S,COS).
- 这些杂质会毒害催化剂,降低电化学转化过程中有价值的C2+产品 (乙烯,酸,乙醇,n-propanol) 的选择性和产量.
- 上游净化对于保持催化剂活性和减少经常再生或更换的运行成本至关重要.
研究的目的:
- 开发一个全面的工艺模型和技术经济分析,用于大型的二阶段CO2/CO电减装置.
- 评估使用高炉气作为原料生产C2+产品的经济可行性.
- 确定影响利能力和商业化途径的关键参数.
主要方法:
- 详细的过程建模和集成上游气体清洁,CO2/CO电解器和下游产品分离使用阿斯Plus.
- 技术经济分析包括资本支出 (CAPEX) 和运营支出 (OPEX) 的评估.
- 对电解剂性能,资本成本,电力价格和产品定价的敏感性分析.
主要成果:
- 基准案例情景表明,大规模的二步CO2/CO电还原过程不是有利可图的.
- 电解剂是主要的成本贡献者 (约占CAPEX和OPEX的63%),而上游清洁是次要的 (约占CAPEX的15%,约占OPEX的8%).
- 在优化条件下可以实现利能力:降低电解器成本 (-50%),降低电力价格 (-50%),更高的电流密度 (+50%),改善电池电压,提高产品价格 (+35%).
结论:
- 电解技术的显著改进和成本的降低对于经济可行性至关重要.
- 有利的市场条件和优化的运营参数可以带来积极的净当前价值 (5400万美元) 和13年的回报期.
- 集成节能电解或直接产品利用可以加速CO2/CO电还原的商业化.
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