Porous MgO-stabilized CaO-based powders/pellets via a citric acid-based carbon template for thermochemical energy storage in concentrated solar power plants
Porous MgO-stabilized CaO-based powders/pellets via a citric acid-based carbon template for thermochemical energy storage in concentrated solar power plants
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DOI：
10.1016/j.cej.2020.124163
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发表时间：
2020-01
影响因子：
15.1
通讯作者：
Ke Wang;Feng Gu;P. Clough;P. Zhao;E. Anthony
中科院分区：
文献类型：
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作者：
Ke Wang;Feng Gu;P. Clough;P. Zhao;E. Anthony
CaO/CaCO 3可逆碳酸化反应（CaL）是集热式太阳能发电厂（CSP）中最有前途的高温热化学储能（TCES）反应之一。在这里，牺牲柠檬酸为基础的碳模板开发生产高性能的氧化钙为基础的吸附剂，以减轻逐步失活与顺序的碳酸化-煅烧循环。在氮气保护下，柠檬酸原位热解生成碳模板。在空气中进行二次煅烧后，生成了稳定的多孔MgO稳定的纳米CaO粉末，并且由于其抗孔堵塞和烧结性，实现了高的长期有效转化率。通过将柠檬酸与石灰石-白云石混合物干混，该程序也可以通过挤出-滚圆路线应用于合成MgO稳定的CaO球团，这导致作为优化的CaO粉末的热稳定和有效的转化。此外，MgO稳定的CaO球团的相当大的机械强度应使它们能够在流化床反应器中实际应用。因此，这种简单，成本效益和易于扩展的合成技术似乎有很大的潜力，CSP-TCES在高温下操作。
The reversible CaO/CaCO3carbonation reaction (CaL) is one of the most promising candidates for high-temperature thermochemical energy storage (TCES) in concentrated solar power plants (CSP). Here, a sacrificial citric acid-based carbon template was developed to produce high-performance CaO-based sorbents to mitigate the progressive deactivation with sequential carbonation-calcination cycling. The carbon template was formed throughin situpyrolysis of citric acid in a simple heating process under nitrogen. After a secondary calcination step in air, a stable porous MgO-stabilized nano-CaO powder was generated and achieved high long-term effective conversion due to its resistance to pore plugging and sintering. By dry mixing citric acid with limestone-dolomite mixtures, this procedure can also be applied to synthesize MgO-stabilized CaO pellets via an extrusion–spheronization route, which resulted in comparably stable and effective conversion as the optimized CaO powder. Additionally, the considerable mechanical strength of MgO-stabilized CaO pellets should enable their realistic application in fluidized bed reactors. Thus, this simple, cost-effective and easily-scalable synthesis technique appears to have great potential for CSP-TCES under high temperature operation.