315MW燃煤机组可再生飞灰磁珠脱汞试验研究OA

To reduce mercury emissions from coal-fired flue gas,different metal halides(ZnCl2,MnCl4,FeCl3 and CuCl2)were loaded onto the surface of magnetospheres(MF).The resulting modified magnetospheres were then applied to mercury removal in a 315 MW coal-fired power plant.Meanwhile,the effects of different modifier concentrations,different unit loads,different injection amounts,and regeneration cycles on the mercury removal performance of the modified magnetospheres were investigated.Additionally,the migration and transformation of mercury in the dust collector section during modified-magnetospheres injection were studied.The results show that CuCl2 has excellent mercury removal performance compared to other magnetosphere modifiers and that a CuCl2 loading of 6%is the optimal modification loading for magnetospheres.The overall mercury removal efficiencies of the CuCl2-modified magnetospheres reaches 97.780%and 99.546%at unit loads of 180 MW and 310 MW,respectively,with the corresponding optimum injection densities being 0.1 g/m3 and 0.15 g/m3.At the same time,after the injection of the modified magnetospheres,most of the mercury in the flue gas is transferred to fly ash,with the proportion of mercury in the flue gas decreasing from 55.86%to 2.5%.In addition,the thermal regeneration efficiencies of the modified magnetospheres are 98.248%and 99.704%after regeneration and cycling for two cycles,respectively.Compared with commercial activated carbon injection in the same conditions,the modified magnetospheres show a much higher mercury removal efficiency than activated carbon injection,which reaches only 64%.Therefore,the modified magnetospheres are an excellent recyclable and efficient adsorbent for mercury removal,which can be widely applied to commercial coal-fired units,and can also provide a reference for future practical application in other units.