›› 2010, Vol. 18 ›› Issue (3): 523-528.

• PRODUCT ENGINEERING AND CHEMICAL TECHNOLOGY • Previous Articles     Next Articles

Impacting Factors of Elemental Mercury Re-emission across a Lab-scale Simulated Scrubber

WU Chengli1,2, CAO Yan2, DONG Zhongbing1, PAN Weiping2   

  1. 1. School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China;
    2. Institute for Combustion Science and Environmental Technology, Western Kentucky University, 42101, USA
  • Received:2009-09-17 Revised:2010-01-20 Online:2010-06-28 Published:2010-06-28
  • Supported by:
    Supported by the US Agency for International Development(USAID)cooperation agreement(486-A-00-06-000140-00)

Impacting Factors of Elemental Mercury Re-emission across a Lab-scale Simulated Scrubber

武成利1,2, 曹晏2, 董众兵1, 潘伟平2   

  1. 1. School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China;
    2. Institute for Combustion Science and Environmental Technology, Western Kentucky University, 42101, USA
  • 通讯作者: WU Chengli,E-mail:chlwu2@163.com
  • 基金资助:
    Supported by the US Agency for International Development(USAID)cooperation agreement(486-A-00-06-000140-00)

Abstract: Elemental mercury(Hg0)re-emissions from slurries and solutions were evaluated in a lab-scale simulated scrubber.Oxidized mercury(Hg2+)standard solution was injected into the simulated scrubber at a desired rate to simulate absorbing and dissolving of Hg2+ in the flue gas across wet flue gas desulfurization(WFGD)systems. PS analytical mercury analyzer was used to continuously determine Hg0re-emission concentrations in the carrier gas from the scrubber.Sulfite ion in the slurry of CaSO3 was validated to reduce Hg2+ to Hg0,while no Hg0 re-emission occurred from slurries of CaSO4 and CaO.Transitional metal ions with low chemical valence such as Fe2+,Pb2+,Ni2+,AsO2-+-1.Reduction reaction of Hg2+ to Hg0 was observed from these solutions.Reduction capabilities for the different transitional metal ions in the solutions were:Pb2+>Cu+>Fe2+>AsO2->Ni2+.

Key words: simulated scrubber, elemental mercury re-emission, impacting factors, sulfite, transitional metal ions

摘要: Elemental mercury(Hg0)re-emissions from slurries and solutions were evaluated in a lab-scale simulated scrubber.Oxidized mercury(Hg2+)standard solution was injected into the simulated scrubber at a desired rate to simulate absorbing and dissolving of Hg2+ in the flue gas across wet flue gas desulfurization(WFGD)systems. PS analytical mercury analyzer was used to continuously determine Hg0re-emission concentrations in the carrier gas from the scrubber.Sulfite ion in the slurry of CaSO3 was validated to reduce Hg2+ to Hg0,while no Hg0 re-emission occurred from slurries of CaSO4 and CaO.Transitional metal ions with low chemical valence such as Fe2+,Pb2+,Ni2+,AsO2-+-1.Reduction reaction of Hg2+ to Hg0 was observed from these solutions.Reduction capabilities for the different transitional metal ions in the solutions were:Pb2+>Cu+>Fe2+>AsO2->Ni2+.

关键词: simulated scrubber, elemental mercury re-emission, impacting factors, sulfite, transitional metal ions