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研究报告

Removal of mercury vapor by fly ash and C-doped polyphenylene sulfide(PPS) fiber

摘要：利用汞蒸气发生器产生的单质汞和烟气中的一些主要气体成分模拟烟气条件,在固定床实验系统上分别进行了燃煤飞灰、聚苯硫醚(PPS)掺炭纤维及燃煤飞灰和PPS掺炭纤维联合对燃煤烟气中Hg⁰的脱除实验研究.结果表明:燃煤飞灰和PPS掺炭纤维对Hg⁰的吸附是物理吸附和化学吸附的共同结果,它们各自的脱汞效率分别可达27%和65%左右;PPS掺炭纤维和飞灰的联合脱汞效率并不是二者单独脱汞效率的代数叠加,它分别受到吸附反应温度、入口汞浓度和烟气停留时间等因素的影响;吸附反应温度越高,燃煤飞灰和PPS掺炭纤维对Hg⁰的联合脱除效率越低;入口汞浓度的增加并不一定会提高脱除效率;烟气停留时间越大,越有利于Hg⁰的脱除.

Abstract：Simulated flue gas which contained elemental mercury was generated by a mercury vapor generator.Our experiments concentrated on removal of Hg⁰ from the flue gas in a laboratory-scale packed bed reactor system.The materials used were fly ash,C-doped PPSfibers and a combination of the two substances.The mercury removal efficiency was 27% by fly ash and 65% by C-doped PPSfibers.The mercury adsorption efficiency of the C-doped PPSfiber mixed with fly ash was not simply the sum of the two components together.The results indicate that the Hg⁰ adsorption occurs by a synergy of physical adsorption and chemical adsorption.Hg removal is a function of the reaction temperature,concentration,and flue gas flow rate and other factors.The higher the adsorption temperature,the lower the Hg⁰ removal efficiency for fly ash mixed with C-doped PPSfiber.Ahigher concentration of mercury at the inlet will not necessarily improve the removal efficiency,but a longer gas residence time is an important factor to increase Hg⁰ removal.