What to do if the nitrogen oxides levels in the flue gas after ammonia combustion in the stripping side line are not up to standard?
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Hello everyone! Our plant uses a single-tower pressurized side-stream extraction process for the acidic water stripping. The ammonia from this side stream does not pass through an ammonia purification system; after being cooled in three stages, it is directly sent to the incinerator for combustion and emission. However, the nitrogen oxide content in the flue gas is very high, and no effective solution has been found yet. I would appreciate it if any colleagues who use the same process could share how they manage to keep the nitrogen oxide levels within acceptable limits. Thank you!
One reason for high nitrogen oxide levels is insufficient combustion temperature, which causes liquid ammonia to convert into nitrogen oxides. By raising the combustion temperature to around 1350 degrees, liquid ammonia burns to form nitrogen, which significantly reduces nitrogen oxides in the flue gases.
The method of using ammonia water to reduce nitrogen oxides through thermoelectric effects is worth learning about