(57a) Efficient Flue Gas NOx Removal: Eliminating SCR System Fouling. Andrew Kline, Environmental Solutions, Igs, Richmond, VA

NOx regulations, along with other emission regulations, continue to become a larger focus across the industrial sector. Meeting these regulations in order to operate in an environmentally responsible way, while maintaining operational efficiency is a key to the success of our industry. SCR Reactors are the most effective tool to eliminate NOx emissions, and are becoming more and more common in the Ethylene market. However, in fired heater applications there are special considerations required for SCR design and operation in order to maintain DeNOx performance while maximizing plant efficiency. One such consideration must be to plan to mitigate SCR fouling.

SCR Fouling is typically caused by refractory or insulation fibers that accumulate and block the face of the catalyst, eventually leading to substantial flow disruption and excessive pressure drops, typically worsening over time. It is not “if” a plant will experience this issue, it is a matter of “when”. This pressure drop and flow maldistribution will cause production rate limitations, unplanned outages, and environmental compliance issues to occur if not addressed early on. The life of the catalyst can also decrease drastically if the issues are not addressed and corrected in the appropriate time frame.

In this presentation, IGS will discuss the changing regulations and the industrial focus on SCRs and DeNOx equipment, along with environmental impacts of poor SCR performance and the production impacts this may cause. We will then discuss various strategies to eliminate SCR fouling and poor ammonia mixing. This will lead to a case study highlighting the NOx improvements and restoration of production rates.