In a CaO/CaCO₃ heat storage system, steam as a calcination medium can be easily separated from CO₂. In this work, the exothermic process of the calcined limestone was simulated with a CFD–DEM model, and the effect of steam on heat storage and attrition performance of the limestone was tested in a bubbling fluidized bed reactor. The results show that under the same carbonation atmosphere, the limestone calcined under steam exhibits better heat storage performance but worse attrition resistance than that calcined under CO₂. After 10 cycles, the effective conversion and attrition rate of the limestone calcined under steam and carbonated under CO₂ are 0.3 and 1.39 μm per cycle, respectively. The attrition rate drops to 1.2 μm per cycle when 20% CO₂ is introduced into the steam calcination atmosphere after 10 cycles. Furthermore, the introduction of the low-concentration steam in the carbonation atmosphere increases the effective conversion of the limestone, but it decreases the exothermic temperature. A mixture of high-concentration steam and CO₂ is suitable as a calcination atmosphere, which provides a simple way for gas separation for a CaO/CaCO₃ heat storage system.

中文翻译：

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CaO/CaCO3蓄热循环过程中蒸汽对流态化石灰石蓄热磨损性能的影响

在CaO/CaCO ₃蓄热系统中，作为煅烧介质的蒸汽可以很容易地与CO ₂分离。在这项工作中，采用 CFD-DEM 模型模拟了煅烧石灰石的放热过程，并在鼓泡流化床反应器中测试了蒸汽对石灰石蓄热和磨损性能的影响。结果表明，在相同碳化气氛下，蒸汽煅烧石灰石的蓄热性能优于CO ₂煅烧石灰石，但耐磨耗性较差。_{10个循环后，蒸汽煅烧和CO 2}碳酸化石灰石的有效转化率和磨耗率每个循环分别为 0.3 和 1.39 μm。当在 10 个循环后将20% CO ₂引入蒸汽煅烧气氛中时，磨损率下降到每个循环 1.2 μm。此外，在碳酸化气氛中引入低浓度蒸汽提高了石灰石的有效转化率，但降低了放热温度。高浓度蒸汽和CO ₂的混合物适合作为煅烧气氛，这为CaO/CaCO ₃蓄热系统的气体分离提供了一种简单的方法。