Storage and discharge efficiency of small-temperature-difference CO2 hydrate batteries with cyclopentane accelerators
Storage and discharge efficiency of small-temperature-difference CO2 hydrate batteries with cyclopentane accelerators
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DOI：
10.1016/j.apenergy.2021.118315
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发表时间：
2022-02
期刊：
影响因子：
11.2
通讯作者：
Jiyou Qin;Daigo Chinen;S. Obara
中科院分区：
文献类型：
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作者：
Jiyou Qin;Daigo Chinen;S. Obara
我们开发了一种电池系统，该电池系统使用由于CO2水合物（CHD）的形成和分解过程而产生的气体水合物热循环来存储和放电。环戊烷（CP）是已知的用于形成CHD的催化剂之一。所提出的系统的总效率从CHD生成过程（能量存储模式）和解离和发电过程（发电模式）的总和获得，其中能量存储模式对应于充电操作，并且发电模式对应于放电操作。具有CHD热循环的电池系统的整体效率的细节，其中添加CP以增加发电速率仍然不清楚。因此，在这项工作中，CP增强CHD热循环的产生和解离过程的效率和使用解离膨胀气体的致动器的发电效率进行了实验研究，以确定所提出的系统的整体效率。通常，CHD热循环的功率密度约为气动储能和抽水蓄能系统的八倍。然而，CHD热循环的能量密度需要进一步提高。此外，与大多数电池和燃料电池相比，CHD热循环既不使用贵金属等稀有金属，也不使用有毒化学品和易燃液体，使其成为廉价，安全和环保的电池系统。
We developed a battery system that stores and discharges electricity using a gas hydrate heat cycle due to the formation and dissociation process of CO2hydrate (CHD). Cyclopentane (CP) is known as one of the used catalysts in the formation of CHD. The overall efficiency of the proposed system obtained from the sum of a CHD generation process (energy storage mode) and dissociation and power generation processes (power generation mode), where the energy storage mode corresponds to the charging operation, and the power generation mode corresponds to the discharging operation. The details of the overall efficiency of the battery systems with CHD heat cycles in which CP is added to increase the generation rate are still unclear. Thus, in this work, the efficiency of the generation and dissociation processes of a CP-enhanced CHD heat cycle and the power generation efficiency of an actuator using dissociated expansion gas were experimentally investigated to determine the overall efficiency of the proposed system. Generally, CHD heat cycles have a power density that is about eight times greater than that of pneumatic energy storage and pumped storage systems. However, the energy density of CHD heat cycles needs further improvement. Moreover, compared with most batteries and fuel cells, CHD heat cycles neither use rare metals, such as precious metals, nor toxic chemicals and flammable fluids, making them cheap, safe, and environmentally friendly battery systems.