Levelized cost of combined hydrogen production by water electrolysis with alkaline-proton exchange membrane

doi:10.19799/j.cnki.2095-4239.2023.0527

Abstract

Abstract:

In alignment with the "carbon peak, carbon neutral" initiative, the relevance of hydrogen energy is increasing. Although the integration of alkaline water electrolysis (AWE) and proton exchange membrane electrolysis (PEM) shows promise in the field of green hydrogen production, its economic viability has been less explored. To address this gap, we introduced a levelized cost of hydrogen (LCOH) model, offering a life-cycle economic assessment for hydrogen production. Quantitative analysis was conducted on a 10000 m³/h hydrogen production system configured with a 4∶1 ratio of AWEto PEM. Subsequently, sensitivity analysis was performed. The results showed that the LCOH for the combined hydrogen production system was 33.22 CNY/kg, which was 3.31 CNY/kg higher than that of the AWE hydrogen production system. Notably, the electricity costs constitute 53.32% of the entire life-cycle cost. Increasing the PEM allocation ratio improved the adaptibility of hydrogen production system to renewable energy fluctuations as well as increased the production cost. In actual projects, focus should be on the variations in the cost of the electrolyzer system, and the PEM allocation ratio could be optimized using the LCOH model. Considering 33.22 CNY/kg as the benchmark, a 20% and 40% reduction in the price of the PEM electrolyzer system increased the PEM allocation ratio to 27.92% and 46.25%, respectively. Similar to the conventional water-electrolysis hydrogen production systems, controlling the electricity price is crucial for enhancing the economic feasibility of combined hydrogen production; a reduction of 0.01 CNY/kWh in electricity price could lead to a decrease of 0.45 CNY/kg. Given the current allocation ratios, the improvement of AWE electrolyzer efficiency should be prioritized, especially when operating under budget constraints.

Key words: hydrogen energy, water electrolysis, combined hydrogen production, levelized cost of hydrogen, economic evaluation

CLC Number:

TK 91

Qili LIN, Hongxun QI, Jingjing HUANG, Bingcheng ZHANG, Zhen CHEN, Zhenkun XIAO. Levelized cost of combined hydrogen production by water electrolysis with alkaline-proton exchange membrane[J]. Energy Storage Science and Technology, 2023, 12(11): 3572-3580.

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序号	单价/(元/kW)	规模描述	文献	文献发布时间
1	1818	5.5 MW/1000 m³/h	[17]	2022
2	1400	N/A	[22]	2022
3	1400～2000	N/A	[23]	2023
4	2000	5 MW/1000 m³/h	[24]	2023
5	2500	N/A	[25]	2023
平均	1853

序号	单价/(元/kW)	规模描述	文献	文献发布时间
1	12727	5.5 MW/400+600 m³/h	[17]	2022
2	10000	1～2 MW	[22]	2022
3	6000	大规模	[23]	2023
4	16000～20000	小规模	[23]	2023
5	6000	5 MW/1000 m³/h	[24]	2023
6	8000	N/A	[25]	2023
平均	11247

序号	名称	单位	数值
1	AWE电解槽系统价格	元/kW	1850
2	AWE电解槽系统规模	MW	44
3	PEM电解槽系统价格	元/kW	见图2
4	PEM电解槽系统规模	MW	10
5	制氢电源	万元/套	1700.00
6	纯水制取设备	万元/套	200.00

序号	名称	单位	数值
1	制氢电耗	kWh/kg	见图3
2	电价	元/kWh	0.30
3	水耗	kg/kg	10
4	水价	元/t	7.00
5	其他材料损耗(KOH)	g/kg	1.90
6	KOH价格	元/kg	8.00
7	年运行维护费用		2%×初始投资
8	AWE电解槽系统大修费用		20%×相应初始投资

序号	名称	成本/万元
1	AWE电解槽系统	8140
2	PEM电解槽系统	6000
3	辅助设备	1900
4	小计	16040