To ensure optimal SCR system performance, physical and computational flow models of proposed SCR installations are used to guide the development of system components, such as the ammonia injection grid and various flow and thermal conditioning devices. Proper attention to these details is particularly important in retrofit applications where the ducts leading to the SCR reactor often cannot be designed for optimal fluid flow characteristics. This paper discusses the process of SCR modeling including the techniques employed to accurately model gas flow, NOx, ammonia, and thermal distributions and mixing. Additionally, the development of economizer bypass systems for SCR temperature control during low-load operation is discussed.

This content is only available via PDF.
You do not currently have access to this content.