DeNOx and DeSOx systems

Energy intensive processes like thermal cracking in an olefin plant and continuous decoking of FCC units in refineries require a high consumption of fossil fuels result-ing in high NOx emissions. To comply with local regulations the NOx content is often reduced in a DeNOx system using ammonia. The challenge of this fast process is to inject the right quantity of ammonia to reduce residual NOx to a minimum while preventing emission of excess ammonia. In-situ analyzers are perfectly suited to monitor NOx and ammonia slip in this dynamic process.