The Calcium Looping (CaL) process, based on the carbonation/calcination of CaO, has been proposed as a feasible technology for Thermochemical Energy Storage (TCES) in Concentrated Solar Power (CSP) plants. The CaL process usually employs limestone as CaO precursor for its very low cost, non-toxicity, abundance and wide geographical distribution. However, the multicycle activity of limestone derived CaO under relevant CaL conditions for TCES in CSP plants can be severely limited by pore plugging. In this work, the alternative use of calcium-rich steel and blast furnace slags after treatment with acetic acid is investigated. A main observation is that the calcination temperature to regenerate the CaO is significantly reduced as compared to limestone. Furthermore, the multicycle activity of some of the slags tested at relevant CaL conditions for TCES remains high and stable if the treated samples are subjected to filtration. This process serves to remove silica grains, which helps decrease the porosity of the CaO resulting from calcination in the mesoporous range thus mitigating pore plugging.

已经提出了基于CaO碳化/煅烧的钙循环（CaL）工艺，作为集中式太阳能发电厂（CSP）中热化学能存储（TCES）的可行技术。CaL工艺通常使用石灰石作为CaO的前体，因为它具有非常低的成本，无毒，丰富且地理分布广泛的特点。但是，在相关的CaL条件下，对于CSP工厂中的TCES，石灰石衍生的CaO的多循环活性可能会受到孔堵塞的严重限制。在这项工作中，研究了用乙酸处理后富钙钢和高炉矿渣的替代用途。主要观察结果是，与石灰石相比，可再生CaO的煅烧温度显着降低。此外，如果对处理过的样品进行过滤，则在相关的CaL条件下测试的某些炉渣对TCES的多循环活性仍然很高且稳定。该过程用于去除二氧化硅颗粒，这有助于降低在中孔范围内煅烧产生的CaO的孔隙率，从而减轻孔堵塞。