An initial assessment of the value of Allam Cycle power plants with liquid oxygen storage in future GB electricity system
An initial assessment of the value of Allam Cycle power plants with liquid oxygen storage in future GB electricity system
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DOI：
10.1016/j.ijggc.2019.04.020
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发表时间：
2019-08
影响因子：
3.9
通讯作者：
C. Mitchell;V. Avagyan;H. Chalmers;M. Lucquiaud
中科院分区：
文献类型：
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作者：
C. Mitchell;V. Avagyan;H. Chalmers;M. Lucquiaud
Allam循环是一种新型的富氧燃烧气体涡轮机动力循环，据报道其净循环效率为58- 60%LHV，运行排放接近于零。阿拉姆循环过程模型的开发显示的净循环热效率（LHV）为58.0%，高于以前在文献中报道的值，由于包括旁路流热源。新的操作模式被添加到提高工厂的操作灵活性，包括循环效率暂时提高到66.1%，使用液氧存储来转移氧气生产的能源损失。这有助于分离氧气和电力生产，并作为能量储存的一种形式。第一次，一个专门建造的机组投入和经济调度（UCED）模型被用来研究阿拉姆循环电厂和液氧储存对系统成本和电网CO2强度的影响，以GB电力系统为例。在一个具有代表性的高净需求的冬季周内，5-15个阿拉姆循环电厂的机组分别以97%-90%的容量系数运行，将系统成本降低2.6%-6.7%，并将电网平均二氧化碳强度降低7.9%-19.0%。在这些工厂中增加氧气储存可以储存剩余的可再生能源，从而避免风力削减。我们的初步研究结果表明，氧气储存可以是有价值的工厂运营商和系统运营商，但也需要进一步的工作，以评估非能源收入流从辅助服务市场，以确定是否可以合理的资本支出的液氧存储没有财政激励。
The Allam Cycle is a novel oxy-combustion gas turbine power cycle with a reported net cycle efficiency of 58–60% LHV and near-zero operating emissions. An Allam Cycle process model is developed displaying a net cycle thermal efficiency (LHV) of 58.0%, a higher value than previously reported in the literature, due to the inclusion of a bypass stream heat source. Novel modes of operation are added to improve plant operational flexibility, including a temporary increase in cycle efficiency to 66.1%, with the use of liquid oxygen storage to shift the energy penalty of oxygen production. This facilitates decoupling oxygen and electricity production and operates as a form of energy storage. For the first time, a purpose-built Unit Commitment and Economic Dispatch (UCED) model is used to investigate the impact of Allam Cycle plants and of liquid oxygen storage on system costs and grid CO2intensities, taking the illustrative case of the GB electricity system. Over a representative winter week with high net demand, a fleet of 5–15 Allam Cycle plants operates with a capacity factor of, respectively 97%-90%, reducing system costs by 2.6%–6.7% and reducing electricity grid average CO2intensity by 7.9%–19.0%. Adding oxygen storage to these plants allows surplus renewable energy generation to be stored, thus avoiding wind curtailment. Our initial findings indicate that oxygen storage can be valuable to both to plant operators and the system operators, but also that further work is required to evaluate non-energy revenue streams from the ancillary service market to determine whether the capital expenditure of liquid oxygen storage could be justified without financial incentives.