Calculating NH₃ Slip for SCR Equipped Cogeneration Units

The NH₃ slip pollutant generated by a recently completed cogeneration plant equipped with an SCR system was accurately monitored by a calculation method without the expense of an NH₃ analyzer. The method of calculating the NH₃ slip developed by the authors is based on measured variables and material balances. Discussed in further detail is the cogeneration plant, SCR characteristics, source of NH₃ slip, variable measurements required for the NH₃ slip calculation, equation development, accuracy of results, and NH₃ analysis methods.