College of Chemical Engineering, Inner Mongolia University of Technology, Huhhot 010051, China.
Hebei Key Laboratory of Inorganic Nanomaterials, School of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, China.
Molecules. 2023 Jun 22;28(13):4910. doi: 10.3390/molecules28134910.
Ca-looping is an effective way to capture CO from coal-fired power plants. However, there are still issues that require further study. One of these issues is the effect of steam on the Ca-looping process. In this paper, a self-madethermogravimetric analyzer that can achieve rapid heating and cooling is used to measure the change of sample weight under constant temperature conditions. The parameters of the Ca-looping are studied in detail, including the addition of water vapor alone in the calcination or carbonation stage and the calcination/carbonation reaction temperatures for both calcination and carbonation stages with water vapor. Steam has a positive overall effect on CO capture in the Ca-looping process. When steam is present in both calcination and carbonation processes, it increases the decomposition rate of CaCO and enhances the subsequent carbonation conversion of CaO. However, when steam was present only in the calcination process, there was lower CaO carbonation conversion in the following carbonation process. In contrast, when steam was present in the carbonation stage, CO capture was improved. Sample characterizations after the reaction showed that although water vapor had a negative effect on the pore structure, adding water vapor increased the diffusion coefficient of CO and the carbonation conversion rate of CaO.
钙循环是捕获燃煤电厂 CO 的有效方法。然而，仍有一些问题需要进一步研究。其中一个问题是蒸汽对钙循环过程的影响。在本文中，使用了一种可以实现快速加热和冷却的自制热重分析仪，在恒温条件下测量样品重量的变化。详细研究了钙循环的参数，包括在煅烧或碳化阶段单独添加水蒸气，以及在水蒸气存在下煅烧和碳化阶段的煅烧/碳化反应温度。蒸汽对钙循环过程中 CO 的捕集有积极的整体影响。当蒸汽存在于煅烧和碳化过程中时，它会增加 CaCO 的分解速率，并增强随后的 CaO 碳化转化率。然而，当蒸汽仅存在于煅烧过程中时，后续碳化过程中的 CaO 碳化转化率较低。相比之下，当蒸汽存在于碳化阶段时，CO 的捕集得到了改善。反应后的样品特性表明，尽管水蒸气对孔结构有负面影响，但添加水蒸气会增加 CO 的扩散系数和 CaO 的碳化转化率。
