IECM 12.0 beta User Manual > Modules Included with the IECM > Pulverized Coal (PC) Plant > SET PARAMETERS > NOx Control > 1. In-Furnace Controls >

Performance

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Inputs for the performance of the In-Furnace NOx Controls technology are entered on the Performance parameter screen. The following parameters are available:

•Combustion NOx Controls: These inputs will display if any combustion technology is used in the option selected in the In-Furnace Controls pull-down menu on the Config screen. This includes the LNB, LNB & OFA, Gas Reburn, and the LNB & SNCR options.

•Actual NOx Removal Efficiency: This is the NOx removal efficiency of the LNB, LNB & OFA, and Gas Reburn options, and the LNB removal portion of the LNB & SNCR option. The percent reduction of NOx is calculated by comparing the actual NOx emission to the uncontrolled NOx emission. The removal is a function of the In-Furnace Control type on the Config screen, the Boiler Firing Type on the Base Plant Performance screen, and the Maximum NOx Removal Efficiency below. Note that the removal is not a function of the NOx emission constraint. This input is highlighted in blue.

•Maximum NOx Removal Efficiency: The maximum removal efficiency of NOx sets the upper bound for the Actual NOx Removal Efficiency above. The maximum removal is a function of the In-Furnace Control type on the Config screen, and the Boiler Firing Type on the Base Plant Performance screen.

•Auxiliary Gas Heat Input: This input will only display if Gas Reburn is selected in the In-Furnace Controls pull-down menu on the Config screen. The flow rate of natural gas injected is determined by this input on a Btu heat input basis.

•SNCR NOx Control: These inputs will only display if SNCR or LNB & SNCR is selected in the In-Furnace Controls pull-down menu on the Config screen.

•Actual NOx Removal Efficiency: The actual NOx removal efficiency is a function of the Maximum NOx Removal Efficiency below, and the Nitrogen Oxide Emission Constraint on the Overall Plant Regulations & Taxes screen. This input is highlighted in blue.

•Maximum NOx Removal Efficiency: The maximum removal efficiency is calculated as a function of the Gross Electrical Output, entered on the Overall Plant Performance screen. Because of difficulty mixing the reagent in the flue gas for larger boilers, the maximum efficiency decreases with increasing plant size.

•Urea Concentration Injected: Urea is typically injected as a liquid diluted by water. This parameter defines the amount of water used to dilute the urea prior to injection.

•SNCR Power Requirement: As mentioned above, the power requirement for the SNCR is a function of the Gross Electrical Output, entered on the Overall Plant Performance screen. The value is determined by the need for tank heaters when urea reagent is used.