Remove elemental mercury by sulfur-impregnated activated carbon in natural gas
LÜ Wei-yang, LIU Sheng-yu, NENGZI Li-chao, WANG Xue-ting, WU Xiao
Air Environmental Modeling and Pollution Controlling Key Laboratory of Sichuan Higher Education Institutes, Chengdu University of information Technology, Chengdu 610225, China
The adsorption performance, influence factors, regeneration method and the adsorption dynamics of the gaseous Hg0 in natural gas removed by commercial sulfur-loaded activated carbon were studied on fixed reacting device. Meanwhile, the removal mercury mechanism of S-loaded activated carbon was put forward by applying characterization methods, including BET, FTIR, XRD and etc. The result showed that the restriction effect of airspeed on removal mercury efficiency was limited. In the initial stage, removal mercury rate and adsorption capacity of element mercury can be raised by increasing mercury concentration. As temperature gets higher, the activated molecule in the system get higher and the removal mercury rate will be promoted. The best effect appeared at 80℃. But when temperature was higher than 80℃, negative effects arose. Dynamic fitting in different stages showed that chemical adsorption was the controlling step of the whole process. Besides, the thermal desorption experiment showed that the removal mercury temperature of s-loaded activated carbon ranged from 300℃ to 450℃, and the absorption capacity of regenerate activated carbon was weakened because of the loss of c-s bond in the regeneration and the surface ablation of activated carbon in the process of twicecarbonization.
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