Synergistic Mechanisms of CaCl2 and CaO on the Vaporization of Cs from Cs-Doped Ash during Thermal Treatment
Synergistic Mechanisms of CaCl2 and CaO on the Vaporization of Cs from Cs-Doped Ash during Thermal Treatment
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CaCl2 和 CaO 对热处理过程中掺铯灰中 Cs 蒸发的协同机制
DOI：
10.1021/acs.energyfuels.8b00620
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发表时间：
2018
期刊：
影响因子：
5.3
通讯作者：
Muller Michael
中科院分区：
文献类型：
--
作者：
Jiao Facun;Kinoshita Norikazu;Kawaguchi Masato;Asada Motoyuki;Honda Maki;Sueki Keisuke;Ninomiya Yoshihiko;Sergeev Dmitry;Blasing Marc;Muller Michael
本研究的目的是澄清的作用，CaCl 2，CaO，以及它们的混合物中的Cs从掺铯灰在热处理过程中的蒸发。特别是，潜在的机制的协同效应的添加的混合物的CaCl 2和CaO对Cs的蒸发进行了研究。蒸发实验在实验室规模的水平炉中在900、1000和1100 °C下进行。结果表明，当反应温度高于1000 °C时，CaCl 2和CaO的混合物对Cs的蒸发有协同作用，与单独添加CaCl 2或CaO相比，Cs的蒸发率显著提高。在热处理过程中，Cs-掺杂灰中CaCl 2、CaO和铝硅酸盐之间的化学反应生成了钙铝石（Ca 6Al 5Si 2O16 Cl 3）和钙铝榴石[Ca 3Al 2（SiO 4）2Cl 4]，延迟了Cl的释放，从而延长了Cs与气态Cl的接触时间。此外，CaO使铝硅酸盐结构不稳定，导致Cs的更高的挥发性和反应性，因此，活化Cs和从硅铝石和/或硅铝榴石分解释放的气态Cl之间容易发生反应。
This study aimed to clarify the roles of CaCl2, CaO, and their mixture in the vaporization of Cs from Cs-doped ash during thermal treatment. In particular, potential mechanisms of the synergistic effect of the addition of a mixture of CaCl2and CaO on Cs vaporization were investigated. Vaporization experiments were carried out in a lab-scale horizontal furnace at 900, 1000, and 1100 °C. The results indicated that adding a mixture of CaCl2and CaO produced a synergistic effect on Cs vaporization when the reaction temperature was above 1000 °C and the vaporization ratio was noticeably increased in comparison to that when adding CaCl2or CaO alone. The formation of wadalite (Ca6Al5Si2O16Cl3) and/or igumnovite [Ca3Al2(SiO4)2Cl4], derived from chemical reactions among CaCl2, CaO, and aluminosilicates in the Cs-doped ash, delayed the release of Cl during thermal treatment, thus extending the contact time of Cs and gaseous Cl. Furthermore, CaO destabilized the aluminosilicate structure, resulting in a higher volatility and reactivity of Cs, and thus, a reaction readily occurred between activated Cs and gaseous Cl released from the decomposition of wadalite and/or igumnovite.