24-10-2012, 03:32 PM
JV Task 28 - Pilot-Scale Evaluation of the Impact of Selective Catalytic Reduction for NO(x) on Mercury Speciation
ABSTRACT
Full-scale tests in Europe and bench-scale tests in the USA have indicated that the catalyst, normally vanadium/titanium
metal oxide, used in the selective catalytic reduction (SCR) of NO(sub x), may promote the formation of Hg(sup 2+) and/or
particulate-bound mercury (Hg(sub p)). To investigate the impact of SCR on mercury speciation, pilot-scale screening tests
were conducted at the Energy& Environmental Research Center. The primary research goal was to determine whether the
catalyst or the injection of ammonia in a representative SCR system promotes the conversion of Hg(sup 0) to Hg(sup 2+)
and/or Hg(sub p) and, if so, which coal types and parameters (e.g., rank and chemical composition) affect the degree of
conversion. Four different coals, three eastern bituminous coals and a Powder River Basin (PRB) subbituminous coal, were
tested. Three tests were conducted for each coal: (1) baseline, (2) NH(sub 3) injection, and (3) SCR of NO(sub x). Speciated
mercury, ammonia slip, SO(sub 3), and chloride measurements were made to determine the effect the SCR reactor had on
mercury speciation.
ABSTRACT
Full-scale tests in Europe and bench-scale tests in the USA have indicated that the catalyst, normally vanadium/titanium
metal oxide, used in the selective catalytic reduction (SCR) of NO(sub x), may promote the formation of Hg(sup 2+) and/or
particulate-bound mercury (Hg(sub p)). To investigate the impact of SCR on mercury speciation, pilot-scale screening tests
were conducted at the Energy& Environmental Research Center. The primary research goal was to determine whether the
catalyst or the injection of ammonia in a representative SCR system promotes the conversion of Hg(sup 0) to Hg(sup 2+)
and/or Hg(sub p) and, if so, which coal types and parameters (e.g., rank and chemical composition) affect the degree of
conversion. Four different coals, three eastern bituminous coals and a Powder River Basin (PRB) subbituminous coal, were
tested. Three tests were conducted for each coal: (1) baseline, (2) NH(sub 3) injection, and (3) SCR of NO(sub x). Speciated
mercury, ammonia slip, SO(sub 3), and chloride measurements were made to determine the effect the SCR reactor had on
mercury speciation.