In the present work, we explore the use of steam in the CaCO₃ calcination step of a calcium looping process devised for integration into a thermochemical energy storage process (CaL-TCES). Steam produces a double benefit: firstly, it fastens the calcination, allowing a reduction of the temperature needed to attain full calcination in short residence times, as those required in practice, resulting in energy savings. This behaviour is justified on the bases of kinetic study results, as obtained from a non-parametric kinetic analysis, which demonstrates that the presence of steam during calcination can reduce the apparent activation energy from 175 kJ/mol to 142 kJ/mol with a steam’s partial pressure of 29%. In addition, the results obtained for multicycle CaL-TCES tests show that steam alleviates the deactivation of the sorbent, which is one of the main limiting factors of this technology. This behaviour is explained in terms of the effect of steam on the microstructure of the resulting CaO. Importantly, the values of the residual conversion attained calcining in steam are higher than those without steam.

在当前的工作中，我们探索了在CaCO _3中使用蒸汽的方法。钙循环工艺的煅烧步骤，设计用于集成到热化学能量存储工艺（CaL-TCES）中。蒸汽具有双重好处：首先，它可以加快煅烧速度，从而降低在短停留时间内达到完全煅烧所需的温度（如实际所需的温度），从而节省了能源。根据非参数动力学分析获得的动力学研究结果可以证明这种行为是合理的，该结果表明，煅烧过程中蒸汽的存在可以将表观活化能从175 kJ / mol降低至142 kJ / mol。分压为29％。此外，通过多周期CaL-TCES测试获得的结果表明，蒸汽减轻了吸附剂的失活，这是该技术的主要限制因素之一。根据蒸汽对生成的CaO的微观结构的影响来解释这种行为。重要的是，在蒸汽中煅烧的残余转化率的值高于没有蒸汽时的残余转化率的值。