Techno-economic analysis of large-scale green hydrogen production and storage
Techno-economic analysis of large-scale green hydrogen production and storage
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DOI：
10.1016/j.apenergy.2023.121333
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发表时间：
2023-09
期刊：
影响因子：
11.2
通讯作者：
Ana María Villarreal Vives;Ruiqi Wang;Subhasish Subhasish-Subhasish;A. Smallbone
中科院分区：
文献类型：
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作者：
Ana María Villarreal Vives;Ruiqi Wang;Subhasish Subhasish-Subhasish;A. Smallbone
生产清洁能源和最大限度地减少能源浪费对于实现联合国可持续发展目标，如可持续发展目标7和13至关重要。本研究分析了多兆瓦级绿色制氢余热回收的技术经济潜力。一个10兆瓦的质子交换膜电解过程的热回收系统与有机朗肯循环（ORC）耦合，以驱动机械压缩的氢气。技术结果表明，当实施废热回收结合ORC时，电解槽的第一定律效率从71.4%提高到98%。ORC可以产生足够的功率来驱动氢气的压缩，从电解槽的出口压力30巴到200巴。通过经济性分析，计算了系统的平准化氢气成本（LCOH），并评估了余热回收与ORC耦合的可行性。结果表明，电力价格主导的LCOH。当电价低时（例如，专用海上风电），LCOH更高时，实施热回收。与ORC相关的额外资本支出和运营支出增加了LCOH，这些额外成本超过了不购买压缩电力所产生的节省。另一方面，当电网电价较高时，热回收和ORC变得有吸引力和可行。
Producing clean energy and minimising energy waste are essential to achieve the United Nations sustainable development goals such as Sustainable Development Goal 7 and 13. This research analyses the techno-economic potential of waste heat recovery from multi-MW scale green hydrogen production. A 10 MW proton exchange membrane electrolysis process is modelled with a heat recovery system coupled with an organic Rankine cycle (ORC) to drive the mechanical compression of hydrogen. The technical results demonstrate that when implementing waste heat recovery coupled with an ORC, the first-law efficiency of electrolyser increases from 71.4% to 98%. The ORC can generate sufficient power to drive the hydrogen's compression from the outlet pressure at the electrolyser 30 bar, up to 200 bar. An economic analysis is conducted to calculate the levelised cost of hydrogen (LCOH) of system and assess the feasibility of implementing waste heat recovery coupled with ORC. The results reveal that electricity prices dominate the LCOH. When electricity prices are low (e.g., dedicated offshore wind electricity), the LCOH is higher when implementing heat recovery. The additional capital expenditure and operating expenditure associated with the ORC increases the LCOH and these additional costs outweigh the savings generated by not purchasing electricity for compression. On the other hand, heat recovery and ORC become attractive and feasible when grid electricity prices are higher.