Analysis of the reasons for excessive NOx levels in sulfur recovery
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The NOx levels from my sulfur recovery system exceed the specified limits from time to time; I’ve tried various ways to find the cause without success. I hope someone can give me some advice
Our sulfur NOx levels have not exceeded the limits; there was once a reading of only 200, which was due to the deactivation of the hydrogenation catalyst and excessive ammonia injection in the quench water.
The main reason for the excessive levels of nitrogen oxides is a problem with the burners in the incinerator, which leads to excessively high local combustion temperatures; however, the new standards that are about to be implemented no longer impose restrictions on nitrogen oxide emissions.
We have also observed a similar phenomenon: when the temperature of the burner in the incinerator increases, nitrogen oxides levels rise as well. Especially above 1000°C, the increase is relatively large, but it’s at most a little over 50!
The local temperature is high, in line with Clauspolunit’s view