SO_2气氛下半焦负载Zn/Fe/Ce高温煤气脱硫剂的再生行为研究  

Regeneration characteristics of modified semi-coke supported Zn /Fe /Ce hot gas desulfurization sorbent in SO_2 atmosphere

作　　者：尚素利 米杰[1] 于蒙[1] 上官炬[1] 

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原030024

出　　处：《燃料化学学报》2014年第1期110-115,共6页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(51272170;21276172)

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。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.

关 键 词：高温煤气 脱硫剂(Fe、Zn、Ce) 再生 SO2气氛 

分 类 号：TQ546.5[化学工程—煤化学工程]