Performance

 

Inputs for the performance of the auxiliary boiler in PC and NGCC plants are entered on the Performance parameter screen. The following parameters are provided:

•Gas Boiler Efficiency: This is the percentage of fuel input energy transferred to steam in the boiler. The model default is based on standard algorithms described in the literature. It takes into consideration the energy losses due to inefficient heat transfer across the preheater, latent heat of evaporation, incomplete combustion, radiation losses, and unaccounted losses.

•Excess Air: This is the excess theoretical air used for combustion in the auxiliary boiler.

•Nitrogen Oxide Emission Rate: This parameter establishes the level of NOx emissions from the boiler. It is based on AP-42, assuming a utility industrial natural gas boiler with tangential firing (275 lb/Mcuft).

•Percent of NOx as NO: This parameter establishes the level of nitric oxide (NO) in the flue gas stream. The remainder of the total NOx emissions is assumed to be nitrogen dioxide (NO2). The default parameter reflects the AP-42 EPA emission factor, which is dependent on the fuel type.

•Thermal Efficiency: This is the thermal efficiency of the auxiliary power system for electricity generation.

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