Can underground space energy storage technology be used in abandoned coal mines?

The underground space resources of abandoned coal mines in China are quite abundant, and the research and development of underground space energy storage technology in coal mines have many benefits.

What is coal underground space electrochemical energy storage?

CUEES concept and technical requirements Coal Underground space Electrochemical Energy Storage (CUEES) makes full use of the underground space of coal mining to store or release electrical energy (various types of batteries) through reversible chemical reactions, so as to achieve efficient use of electrical energy, as shown in Fig. 20 [ 94 ].

Can coal mining space be used for electrochemical energy storage?

The use of coal mining space for electrochemical energy storage has not yet been commercialized [ 95 ], and four key problems still need to be broken through, namely, site safety evaluation of underground space for coal development, construction of electrochemical energy storage geological bodies.

What is coal underground thermal energy storage?

Coal underground thermal energy storage (CUTES) is a form of energy storage that makes extensive use of the underground highways in closed mines as a place to store energy and to offer heating and cooling in the winter and summer months, respectively.

Why is the underground space of a coal mine important?

This is because the underground space of a coal mine has the following advantages: (1) Rich space: the underground coal mine has a vast space, especially underground cavities such as goafs and abandoned roadways, which can be used to store a large amount of energy.

How many m3 underground space will China's coal mines provide?

Relevant research shows that from 2016 to 2020, closed mines will have provided about 80 M m3 underground space. At the same time, China's coal mining destroys about 6 billion tons of groundwater every year on average, and the utilization rate is only 25 %.