在聚光太阳能发电系统 (CSP) 中集成 Ca 循环 (CaL) 过程已被确定为热化学储能 (TCES) 系统的一种有趣方法，因为 TCES 材料再生可以使用清洁且无限的太阳能。CaCO 3的CaL 循环稳定性是该技术大规模实施的重要参数，但文献中很少关注天然CaO 前体如石灰石和其他CaCO 3基材料的吸收率。碳酸钙3/CaO 颗粒通常是白色的，它们在对应于太阳辐射的波长下的吸收率相对较低，限制了它们在直接辐照反应器中的使用。在这项工作中，在掺杂 10 或 20 wt% 的“暗”惰性添加剂后，评估并改善了不同废物资源和天然葡萄牙地质材料的储热密度 (HSD) 和吸收率。污泥和 SiC 用于增加 CaL-TCES 材料在太阳可见辐射波长下的吸收率并阻碍材料烧结。发现用污泥掺杂 CaL-TCES 材料阻碍了 CaO 颗粒的烧结，经过 20 次碳化-煅烧循环后，掺杂材料的 HSD 比未掺杂材料的相应值高两倍（400-408与 203 kJ/kg 碳酸钙相比3）。然而，污泥添加剂对 TCES 材料的太阳能吸收率的影响很小。另一方面，在大理石粉末废料 (WMP-Galrão) 中添加 SiC 对 TCES 材料的吸收率有 13% 的积极影响，但不会改善 HSD。CaL-TCES 材料的吸收率是一个相关特性，可以通过使用“深色”惰性添加剂来提高。这些新结果表明，可以通过定制大理石和污泥废物衍生材料来获得具有改进 HSD 的 TCES 材料，但需要评估来自其他来源的具有更高太阳能吸收率的污泥。废物的利用与循环经济目标相关，而且是环保的。

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The integration of the Ca-looping (CaL) process in concentrated solar power systems (CSP) has been identified as an interesting approach for thermochemical energy storage (TCES) systems, since the TCES material regeneration can use clean and unlimited solar energy. The CaL cyclic stability of CaCO3 is an important parameter for the large-scale implementation of this technology, but in literature little attention has been paid to the absorptivity of natural CaO precursors such as limestone and other CaCO3-based materials. The CaCO3/CaO particles are usually white, and their absorptivity is relatively low at the wavelengths that correspond to solar radiation, limiting their use in directly irradiated reactors. In this work, the heat storage density (HSD) and absorptivity of different waste resources and natural Portuguese geological materials were assessed and improved after doping with 10 or 20 wt% of “dark” inert additives. A sludge and SiC were used to increase the CaL-TCES materials absorptivity at the wavelengths of solar visible radiation and to hinder the material sintering. It is found that the doping of the CaL-TCES materials with sludge hinders the sintering of the CaO particles, and after 20 carbonation-calcination cycles the HSD of the doped material is two times higher than the corresponding value for undoped material (400–408 vs 203 kJ/kg CaCO3). However, the sludge additive has a minimal impact on the solar absorptivity of the TCES material. On the other hand, the SiC addition to a waste of marble powder (WMP-Galrão) has a positive impact with an increase of 13 % on the absorptivity of the TCES material but does not improve the HSD. The absorptivity of CaL-TCES materials is a relevant property that can be improved through the use of “dark” inert additives. These new results show that TCES materials with improved HSD can be obtained through the tailoring of marble and sludge waste-derived materials, but sludges from other sources, with higher solar absorptivity need to be evaluated. The use of wastes is relevant for the circular economy goals, and it is environmentally friendly.