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.

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