Energy storage device based on a hybrid system of a CO2 heat pump cycle and a CO2 hydrate heat cycle
Energy storage device based on a hybrid system of a CO2 heat pump cycle and a CO2 hydrate heat cycle
复制标题
DOI：
10.1016/j.rser.2023.113290
复制
发表时间：
2023-06
影响因子：
15.9
通讯作者：
中科院分区：
文献类型：
--
作者：
采用基于实验的数值分析方法，研究了一种基于co2热泵循环和co2水合物热循环混合循环的新型大容量储能装置（储能容量达数兆瓦时以上）。在co2热泵循环的充电模式中，压缩过程的工作是用可再生能源的剩余电力输入的。冷凝过程后，液态二氧化碳被储存在一个罐中。在放电（发电）模式下，储存在罐内的液态co2被外界空气加热，膨胀后的气体供给膨胀机，膨胀机再运行发电机从膨胀工作中获得电力。但是，如果外部温度较低，液态co2的膨胀就会不足。将上述CO2hydrate热循环加入到co2热泵循环中。该系统的能量体积密度为80 ~ 140 kWh/m3，充放电效率为60% ~ 106%，设备成本与抽水蓄能相当。在<10℃的环境温度下，天然气水合物储能混合系统具有更高的能量体积密度和充放电效率。
A new large-capacity energy storage device (with a storage capacity of several megawatt-hours or more) based on a hybrid cycle of a CO2heat pump cycle and a CO2hydrate heat cycle is investigated using an experiment-based numerical analysis. In the charging mode of the CO2heat pump cycle, the work of the compression process is input with surplus electricity from renewable energy sources. Liquid CO2is stored in a tank after the condensation process. In the discharge (power generation) mode, the liquid CO2stored in the tank is heated by outside air, and the expanded gas is supplied to the expander, which then operates the generator to obtain electricity from the expansion work. However, if the outside temperature is low, the expansion of liquid CO2will be insufficient. The abovementioned CO2hydrate heat cycle is added to the CO2heat pump cycle. The resulting energy volume density of the proposed system is 80–140 kWh/m3, with a charge–discharge efficiency of 60%–106%, and the equipment costs should be similar to those of pumped storage. At ambient temperatures of <10 °C, the hybrid system with energy storage by gas hydrates is more effective, with a higher energy volume density and charge–discharge efficiency than previous systems.