The paper presents comparative kinetic modelling of nitrogen oxides (NO x ) removal from flue gases by selective non-catalytic reduction process using ammonia as reducing agent. The computer code SENKIN is used in this study with the three published chemical kinetic mechanisms; Zanoelo, Kilpinen and Skreiberg. Kinetic modeling was performed for an isothermal plug flow reactor at atmospheric pressure so as to compare it with the experimental results. A 500 ppm NO x background in the flue gas is

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... onsidered and kept constant throughout the investigation. The ammonia performance was modeled in the range of 750 to 1250 o C using the molar ratios NH 3 /NO x from 0.25 to 3.0 and residence times up to 1.5 seconds. The modeling using all the mechanisms exhibits and confirms a temperature window of NO x reduction with ammonia. It was observed that 80% of NO x reduction efficiency could be achieved if the flue gas is given 300 msec to react with ammonia, while it is passing through a section within a temperature range of 910 to 1060 o C (Kilpinen mechanism) or within a temperature range of 925 to 1030 o C (Zanoelo mechanism) or within a temperature range of 890 to 1090 o C (Skreiberg mechanism).