IECM 12.0 beta User Manual > Modules Included with the IECM > Pulverized Coal (PC) Plant > SET PARAMETERS > Overall Plant >

Regulations & Taxes

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The Regulations & Taxes parameter screen accepts input for the allowable emission limits for sulfur dioxide, nitrogen oxides and particulate matter. Mercury and carbon dioxide are constrained by their removal efficiencies across the entire plant.

The default values for the calculated inputs reflect current United States New Source Performance Standards (NSPS), which are applicable to all units constructed since 1978. SO2 emission limits are based on the NSPS limits that are a function of the sulfur content of the coal.

The emission constraints determine the removal efficiencies of control systems for SO2, NOx, and particulate matter required to comply with the specified emission constraints. As discussed later, however, user-specified values for control technology performance may cause the plant to over- comply or under-comply with the emission constraints specified in this screen. The following emission constraints are provided:

•Sulfur Dioxide Emission Constraint: This emission constraint is defined by the 1979 revised NSPS. The calculated value is determined by the potential emission of the raw coal, minus the amount of sulfur retained in the ash streams. The emission limit is dependent on the fuel type and is used to determine the removal efficiency of SOx control systems.

•Nitrogen Oxide Emission Constraint: The combined emissions of NO2 and NO3 of present power plants are constrained by NSPS standards. The limit is a function of the coal rank and fuel type and is used to determine the removal efficiency of NOx control systems.

•Particulate Emission Constraint: The emission constraint of the total suspended particulates is defined by the NSPS standards of 1978. The limit is a function of the fuel type and is used to determine the removal efficiency of particulate control systems.

•Total Mercury Removal Efficiency: This is the overall removal of mercury, including all forms, from the entire power plant. It is used to determine the particular removals in other technologies.

•Total CO2 Removal Efficiency: This is the overall CO2 capture efficiency required to meet the emission standard. This parameter will only be shown when the plant includes a CCS option which has a separate removal efficiency setting. The removal efficiency for some CCS options is constrained by other settings; in those cases this parameter will not be shown, and you will need to adjust the CCS parameters to obtain the desired efficiency.

This screen also allows the user to enter the taxes on emissions in dollars per ton. The final costs determined from these inputs are available in the Stack results section of the IECM. The costs are added to the overall plant cost, not a particular technology. The following taxes on emissions may be specified:

•Sulfur Dioxide (SO2): The cost to the plant of emitting sulfur dioxide in dollars per ton.

•Nitrogen Oxide (equivalent NO2): The cost to the plant of emitting nitrogen oxide in dollars per ton.

•Carbon Dioxide (CO2): The cost to the plant of emitting carbon dioxide in dollars per ton.