Structurally improved, TiO2-incorporated, CaO-based pellets for thermochemical energy storage in concentrated solar power plants

被引：90

作者：

Bai, Shengbin ^{[1
]}

Sun, Jian ^{[1
]}

Zhou, Zijian ^{[2
]}

Bu, Changsheng ^{[1
]}

Chen, Xiaole ^{[1
]}

Yang, Yuandong ^{[2
]}

Wang, Ruilin ^{[1
]}

Guo, Yafei ^{[1
]}

Zhao, Chuanwen ^{[1
]}

Liu, Wenqiang ^{[2
]}

机构：

[1] Nanjing Normal Univ, Sch Energy & Mech Engn, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210042, Peoples R China

[2] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Peoples R China

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2021年 / 226卷

基金：

中国国家自然科学基金;

关键词：

Thermochemical energy storage; CaO-Based pellets; TiO2; incorporation; Pore-forming template; Mechanical strength; CARBIDE SLAG PELLETS; ONE-STEP SYNTHESIS; CO2; CAPTURE; PERFORMANCE; SORBENTS; ENHANCEMENT; COMPOSITES; SCALE;

D O I：

10.1016/j.solmat.2021.111076

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Calcium looping process (CaL) is a promising thermochemical energy storage technology for the application in the 3rd generation concentrated solar power plants (CSP). Hence, it is necessary to develop the highly efficient CaO-based heat storage composite materials. The structurally improved, CaO-based pellets were prepared via adding cellulose as the pore-forming template. Furthermore, the approach of TiO2 incorporation was adopted aiming to enhance the anti-sintering ability of the structurally improved, CaO-based pellets. It is found that the structurally improved, TiO2-incorporated, CaO-based pellets that containing 25 wt% of TiO2 exhibit the highest CaO carbonation conversion and energy density of 57.5% and 1827.7 kJ/kg after 20 cycles, which are nearly 1.3 times as high as those of the pure Ca(OH)(2) pellets. The superiority of the structurally improved, TiO2-incorporated, CaO-based pellets on cyclic heat energy storage/release is more prominent under harsh calcination conditions (950 degrees C, pure CO2). The evenly distributed CaTiO3 grains, providing structural stability to the CaO-based pellets and also enhancing the anti-sintering ability, are responsible for the improved cyclic energy storage/release performance. Additionally, the desirable compression strength (16.67 +/- 1.05 MPa) contributes to strengthen the practicability of structurally improved, TiO2-incorporated, CaO-based pellets applied in the CaLCSP system.

引用

页数：11

共 53 条

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