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To optimize the system configuration scheme for green hydrogen co-firing in coal-fired power units at large renewable bases in desert, gobi, and wasteland areas to achieve decarbonization, a comprehensive system framework encompassing hydrogen production, hydrogen storage, energy storage, and hydrogen co-firing in coal-fired power units is established. It develops a system configuration optimization model aiming for the lowest hydrogen production cost under a decarbonization target constraint. The model is solved and analyzed using mixed-integer linear programming to explore the optimal configuration solutions for a decarbonization system via green hydrogen co-firing in different operating scenarios. The model is demonstrated through a case study. Under the constraint of 10% decarbonization for a single coal-fired power unit, if only curtailed wind and solar power are used for hydrogen production, the annual utilization hours of the hydrogen production equipment are only about 2 000 hours, and the green hydrogen cost is as high as 3.02 yuan/m3 (33.8 yuan/kg). This leads to an increase of 0.217 9 yuan/(kW·h) in the per-unit electricity cost for a single coal-fired power unit. Configuring electrochemical energy storage can reduce the scale of hydrogen production and storage systems and increase the utilization hours of hydrogen production equipment. However, limited by high energy storage construction costs, the energy storage scale needs to be optimally determined, and the green hydrogen cost can be reduced to approximately 2.35 yuan/m3 (26.3 yuan/kg) at its lowest, which leads to an increase of 0.165 2 yuan/(kW·h) in the per-unit electricity cost for a single coal-fired power unit. Furthermore, if a small amount of grid electricity can be introduced to assist hydrogen production within the scope of green hydrogen certification, system construction costs can be further reduced. The hydrogen production cost is expected to decrease to approximately 2.12 yuan/m3 (23.7 yuan/kg) and the per-unit electricity cost for a single coal-fired power unit would increase by 0.142 6 yuan/(kW·h).
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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