IECM 12.0 beta User Manual > Modules Included with the IECM > Pulverized Coal (PC) Plant > SET PARAMETERS > Fuel > 4. Mercury >

Trace Concentrations

← Previous | Next →

The concentration of mercury in the as-fired coal and speciation of mercury after combustion are entered on the Trace Concentrations parameter screen .

The following parameters are provided:

•Concentration on a Dry Basis: Trace elements found in fuels are typically measured and reported as a mass concentration given on a dry basis. The IECM uses this concentration in conjunction with the fuel flow rate and fuel moisture to determine the mass flow rate. Currently Mercury is the only trace species tracked in the IECM.

•Mercury in Primary Fuel (elemental): This input parameter specifies the mass concentration of total mercury in the coal given on a dry basis. The mercury concentration should be given on an elemental basis, not on a mercury compound basis. The default value is a function of the coal rank.

•Mercury in Auxiliary Gas (elemental): This input parameter specifies the mass concentration of total mercury in the natural gas. The mercury concentration should be given on an elemental basis, not on a mercury compound basis.

•Mercury Speciation: Once the fuel is combusted, the mercury can be identified in primarily two chemical states: elemental (Hg0) and oxidized (Hg+2). Although mercury can alternatively be reported as particulate or gas phase, the IECM assumes Mercury is reported on an elemental and oxidized basis.

•Elemental: This is the percent of total mercury that is in an elemental state (Hg0) after combustion. Elemental mercury is typically unreactive and passes through a power plant. The default value is a function of the coal rank.

•Oxidized: This is the percent of total mercury that is in an oxidized state (Hg+2) after combustion. Oxidized mercury is very reactive and typically forms mercury compounds. The default value is a function of the coal rank.

•Particulate: This parameter is not currently used in the IECM. Its value is set to force the sum of the speciation types to be 100%.