SO2气氛下半焦负载Zn/Fe/Ce高温煤气脱硫剂的再生行为研究

以共沉淀法制备了半焦负载Zn/Fe/Ce（物质的量比1.0：2.0：0.6）高温煤气脱硫剂，在固定床装置上研究了再生反应温度、进口SO₂浓度以及再生气空速对再生性能的影响，并进行三次硫化-再生循环测试。采用XRD、SEM、BET等测试手段对脱硫剂的新鲜样、硫化样及再生样进行了表征。实验结果表明，半焦负载Zn/Fe/Ce高温煤气脱硫剂在SO₂气氛下600 ℃就能发生再生反应，且再生后的主要产物为ZnFe₂O₄、CeO₂和单质硫；最佳再生条件为，再生温度700 ℃、进口SO₂体积分数为12%、再生气空速为5 000 h^-1。脱硫剂经过多次硫化-再生循环后，脱硫剂仍能保持较好的硫化活性。

Regeneration characteristics of modified semi-coke supported Zn/Fe/Ce hot gas desulfurization sorbent in SO2 atmosphere

The influences of temperature, sulfur dioxide concentration and space velocity on the regeneration behavior of modified semi-coke supported Fe/Zn/Ce sorbent were investigated in a quartz fixed-bed reactor of 20 mm diameter. The sorbents were prepared by co-precipitation method with the Zn/Fe/Ce molar ratio of 1.0:2.0:0.6 supported on the modified semi-coke. The changes of crystalline phase and morphology of the sorbent before and after regeneration were examined by X-ray diffraction and scanning electron microscopy. The surface area and pore volume of sorbents were characterized by N₂ adsorption. The results show that the sorbent can be regenerated over 600 ℃ and the elemental sulfur is produced. The optimum regeneration temperature, SO₂ concentration and space velocity are 700 ℃, 12% and 5 000 h^-1, respectively.