Calcium‒based chemical looping gasification (calcium‒based CLG) shows promise for as a solution for waste problems. There has, however, been little discussion about dioxin emissions and heavy metal contamination in calcium‒based CLG. Herein, a thermodynamic equilibrium analysis was investigated to determine the characterization of copper (II) chemical forms (a main catalytic metal for the formation of dioxins) and heavy metal distribution in calcium‒based CLG of municipal solid waste (MSW). Results demonstrate that the high hydrogen concentration in calcium‒based CLG could promote the formation of HCl (g) instead of CuCl₂ (g); therefore, it was beneficial in suppressing formation of dioxins. Furthermore, during the operating temperature of gasifier in calcium‒based CLG (600–750 °C), some heavy metals (Pb, Cr, Cu) could be stabilized as solid compounds except for Pb. The valences of heavy metals decreased in the calcium‒based CLG. If sulfur was present, some heavy metals, such as Pb, could convert into solid sulfides; sulfur, therefore, has a positive effect on the stabilization of heavy metals. Consequently, this study may provide information useful in restricting dioxin emissions and heavy metal contamination in calcium‒based CLG.

基于钙的化学循环气化（基于钙的CLG）显示出有望作为解决废物问题的方法。然而，关于基于钙的CLG中的二恶英排放和重金属污染的讨论很少。在本文中，进行了热力学平衡分析，以确定铜（II）化学形式（形成二恶英的主要催化金属）的特征以及城市固体废物（MSW）的钙基CLG中的重金属分布。结果表明，钙基CLG中的高氢浓度可以促进HCl（g）的形成，而不是CuCl ₂的形成。（G）; 因此，有利于抑制二恶英的形成。此外，在钙基CLG气化炉的工作温度（600–750°C）下，除Pb外，某些重金属（Pb，Cr，Cu）可以稳定为固体化合物。钙基CLG中的重金属化合价下降。如果存在硫，则某些重金属（例如Pb）可能会转化为固体硫化物。因此，硫对重金属的稳定化具有积极作用。因此，这项研究可能提供有用的信息，以限制钙基CLG中的二恶英排放和重金属污染。