SO_2改性高硫石油焦脱汞实验研究

Experimental research on mercury removal by modified petroleum coke with SO_2 activation

以SO_2为活性气体对3种不同的原始高硫石油焦进行活化形成高硫石油焦样品。采用比表面积及孔隙度分析仪、X射线光电子能谱分析和元素分析等仪器和方法研究样品的物理化学性质,在固定床实验装置上对样品的脱汞能力进行实验研究。结果表明,用SO_2气体改性石油焦的过程是一个有效的载硫过程;经过SO_2改性后的高硫石油焦表面负载有大量有机硫(噻吩),具有较强的脱汞能力;高硫石油焦表面的含硫量和硫形态对其吸附脱汞能力有很大影响,高硫石油焦表面的微孔结构和微观形貌也在一定程度上影响其脱汞能力;在一定温度范围内随着吸附温度的降低,改性高硫石油焦的Hg0穿透率呈下降趋势,即汞脱除性能不断增强。

Three different crude high sulfur petroleum cokes were activated with SO_2 to prepare samples of the petroleum coke with high sulfur content. The physical and chemical properties of the samples were characterized using surface area and porosity analyzer,X-ray photoelectron spectroscopy and ultimate analysis. Experimental studies on mercury removal were investigated in a fixed bed reactor system. The results showed that the process of modification of petroleum coke with SO_2 effectively loaded sulfur on the surface. A large amount of organic sulfur（thiophene）was detected on the surface of the high-sulfur-content petroleum coke,which indicated its great ability of mercury removal. The sulfur content and sulfur formd on the surface of petroleum coke with high sulfur content have a great influence on the mercury removal capacity. The microstructure and micro morphology on surface of the petroleum coke played a remarkable role on mercury removal ability. The Hg0 penetration rate decreased and the mercury removal ability of high-sulfur-content petroleum coke increased with reduction of adsorption temperature in a certain range.