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 NO_x emissions. To comply with local regulations the NO_x 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 NO_x to a minimum while preventing emission of excess ammonia. In-situ analyzers are perfectly suited to monitor NO_x and ammonia slip in this dynamic process.