活性炭吸附汞课件.ppt

1、Mercury Adsorption by Activated Carbon in flue gasNew standard in China GB13223-2011 flue gas Hg:0.03mg/m3 2015coal-fired power plantActivated Carbon FeasibleReliable Physical Adsorption&Chemical Adsorption Physical adsorption Porous Structure Large Surface Area Adsorption of Impurities(Molecular Si

2、zePore Size)Feature:Lower Temperature,higher mercury adsorption Physical Adsorption&Chemical Adsorption Chemical adsorption Oxygen-containing:-COOH;COO-;Phenol;Carbonyl,et al.Surface Oxygen:Hg on the surface of activated carbon is always together with Oxygen.(X-ray absorption fine structure spectros

3、copy)Active SitesPhysical Adsorption&Chemical Adsorption Chemical adsorption closed box environment:O2+Hg0=no reaction O2 strengthens activated carbon adsorption at 100-300.Bjorn HallPhysical Adsorption&Chemical AdsorptionFrank E.Hugginsa Chemical adsorption Adsorption form of Hg0 test(XAFS&XANEs)Al

4、l Hg2+No Hg0Sorbent surface:I,S,Cl,O,et al.Acid gas in flue gas Physical Adsorption&Chemical AdsorptionStanley Chemical adsorption Basic atmosphere:O2,CO2,N2 and water at 107SO2/HCl/NO/NO2 appear aloneAdsorption efficiency increased to 90-100%HCl and NO/SO2 and NO2 Adsorption efficiency reduced rapi

5、dly.Physical Adsorption&Chemical Adsorption胡长兴 Hu Changxin Chemical adsorption N2CO2O2 SO2 NO2 NO HCl H2OHg2+Hg0Physical Adsorption&Chemical Adsorption胡长兴 Hu Changxin Chemical adsorption Treated activated carbon 863m2/g 0.23mg/g Untreated activated carbon 53m2/g 1.85mg/g Which one is the dominant?Me

6、rcede,et alOxygen Group is more importantUnder atmospheric pressure:Physical adsorption Chemical adsorption Low temperature(75):physical adsorption High temperature(140):chemical adsorptionWhich one is the dominant?Krishnan SV&Kwon Sco-existChemical ModificationSang-Sup Lee,et al 2009Brominated activated carbon (Br;DARCO Hg-LH)Cupric chloride-impregnated activated carbon (CuCl;C-AC)Chemical ModificationSang-Sup Lee,et al 2009Chemical ModificationSang-Sup Lee,et al 2009Thank you for your attention!