Experimental study of dry HCl removal from simulated combustion flue gases using calcined limestone (CaO) is reported. The study was conducted in a unique fixed-bed reactor coupled with an online Fourier transform infrared (FTIR) spectrometer to investigate the effects of the presence of SO₂, CO₂ and O₂ on the chlorination reactivity of calcined limestone. The dechlorination efficiency, defined by the effluent HCl concentration, would be used to describe the HCl absorption history to gain a better understanding of the chlorination behavior. The experimental results indicated that the HCl uptake capacity remains less affected under various gas atmospheres at 650 °C although the chlorination is found to be faster when CO₂ is present. At temperatures of 750 or 850 °C, the presence of SO₂ or O₂ significantly decreases the reactivity of the calcined limestone toward HCl. The concurrent sulfation of chlorides, such as CaCl₂·H₂O and/or CaClOH, causes the subsequent rerelease of HCl to the gas phase, thus reducing the attainable extent of the chlorination reaction. The presence of O₂ impedes the conversion of calcined limestone to chlorides, presumably through some type of reaction involving the dechlorination of the sorbent particles.

中文翻译：

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高温煅烧石灰石去除烟道气中的HCl

报告了使用煅烧石灰石（CaO）从模拟燃烧烟道气中除去干HCl的实验研究。该研究是在一个独特的固定床反应器中进行的，该反应器与在线傅立叶变换红外（FTIR）光谱仪结合使用，以研究SO ₂，CO ₂和O ₂的存在对煅烧石灰石氯化反应活性的影响。由废水中的HCl浓度定义的脱氯效率将用于描述HCl的吸收历史，以更好地了解氯化行为。实验结果表明，在650°C的各种气体气氛下，HCl的吸收能力受到的影响较小，尽管发现当CO ₂时氯化速度更快。存在。在750或850°C的温度下，SO ₂或O ₂的存在会显着降低煅烧石灰石对HCl的反应性。氯化物（例如CaCl ₂ ·H ₂ O和/或CaClOH）的同时硫酸化会导致随后的HCl重新释放到气相中，从而降低可达到的氯化反应程度。O ₂的存在阻碍了煅烧石灰石向氯化物的转化，大概是通过涉及吸附剂颗粒脱氯的某种类型的反应。