Regeneration characteristics of modified semi-coke supported Zn/Fe/Ce hot gas desulfurization sorbent in SO2 atmosphere
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摘要: 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。
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关键词:
- 高温煤气 /
- 脱硫剂(Fe、Zn、Ce) /
- 再生 /
- SO2气氛
Abstract: 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.-
Key words:
- hot coal gas /
- semi-coke supported (Fe, Zn, Ce) sorbent /
- regeneration /
- SO2 atmosphere
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