Preparation and thermal storage properties of CaO-based thermal storage module with a hierarchically porous structure

doi:10.19799/j.cnki.2095-4239.2024.0863

Abstract

Abstract:

Calcium looping technology is increasingly recognized as a promising thermal chemical energy storage technology solution due to its high thermal storage density, cost-effective raw materials, and eco-friendliness. However, conventional modeling methods have limitations in terms of heat and mass transfer and the mechanical stability of porous structures. These limitations hinder the widespread adoption of calcium looping technology. This study innovatively introduces a hierarchically porous structure modeling approach to successfully develop a CaO-based thermal energy storage module with a hierarchically porous structure, excellent cycling stability, and robust mechanical characteristics by combining foaming technology and a template sacrifice method, as well as the incorporation of polyvinyl pyrrolidone as a binder. The experimental results indicate that the thermal energy storage module exhibits a large-span porous structure ranging from 60 nm to 1.2 mm, effectively integrating the material and structural design. The self-supporting structure eliminates the problem of reduced energy storage density caused by the introduction of inert support materials. After 100 cycles of stability and compressive strength tests, the thermal energy storage module maintained its structural integrity with an energy storage density of 1094 kJ/kg and compressive strength of 0.31 MPa. Furthermore, the synthesis strategy of the proposed thermal energy storage module is simple and efficient, avoiding complex procedures and reliance on expensive equipment, making it suitable for large-scale industrial production. This study offers novel insights and solutions for using calcium looping technology in the field of thermal chemical energy storage, with the potential to advance its development and commercialization.

Key words: thermochemical heat storage, calcium oxide, modular molding, hierarchically porous structure

CLC Number:

TK 02

Liang YAO, Nan HE, Qicheng CHEN. Preparation and thermal storage properties of CaO-based thermal storage module with a hierarchically porous structure[J]. Energy Storage Science and Technology, 2024, 13(12): 4282-4289.

Figures/Tables 15

Fig. 1

Fig. 2

Table 1

Parameters related to thermal storage modules with different PVP contents"

样品名称	PU泡沫/PPI	尺寸/mm	PVP含量/%
粉末	—	—	0
Ca-P	45	15 $×$ 15 $×$ 15	0
Ca-1	45	15 $×$ 15 $×$ 15	1
Ca-2	45	15 $×$ 15 $×$ 15	2

Table 1

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Table 2

Parameters related to heat storage modules with different volume sizes"

样品名称	PU泡沫/PPI	尺寸/mm	PVP含量/%
Ca-7.5	45	7.5 $×$ 7.5 $×$ 7.5	1
Ca-15	45	15 $×$ 15 $×$ 15	1
Ca-25	45	25 $×$ 25 $×$ 25	1

Table 2

Fig. 9

Fig. 10

Fig. 11

Fig. 12

Fig. 13

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