Affiliations: Department of Thermal Engineering, University of
Science and Technology, Beijing 100083, China | The State Key Laboratory of Clean Combustion of Coal,
Tsinghua University, Beijing 100084, China | Department of Chemical Engineering, University of
North Dakota, PO Box 9018, ND58202-9018, USA
Abstract: The adsorption capacity for vapor-phase elemental mercury
(Hg^0) of residual carbon separated from fly ash was studied
in an attempt for the control of elemental mercury emissions from combustion
processes. At Iow mercury concentrations (< 200
μg/m^3), unburned carbon had higher adsorption capacity
than commercial activated carbon. The adsorbality of unburned carbon was also
found to be source dependent. Isotherms of FS carbon (separated from fly ash of
a power plant of Shishi in Fujian Province) were similar to those classified as
type II. Isotherms of XJ carbon (separated from fly ash of a power plant of
Jingcheng in Shanxi Province) were more like those classified as type III. Due
to the relatively Iow production costs, these residual carbons would likely be
considerably more costeffective for the full-scale removal of mercury from
combustion flue gases than other technology.
