Jeffrey Goodwin | February 5th, 2026
Please join Andy Toback, Principal Engineer of Environex, at the 501 F/G User’s Group in Norfolk, VA for a special presentation regarding Ammonia Injection Grid (AIG) Tuning on Monday, February 16, 2026 at 1pm in the Momentum 2 Room.
Ammonia Injection Grid (AIG) Tuning can be a useful tool in your plant’s environmental performance and operations toolboxes, but only if it is needed and the circumstances are right. Under the right circumstances, AIG tuning can significantly reduce ammonia consumption, ammonia slip, the formation of ammonia salts on back-end boiler tubes, and the associated backpressure those salts cause. Under the wrong conditions, you can spend a lot of time and money on AIG tuning to get marginal improvements or find out that your systems are either not good candidates or are not appropriately set up so that the AIGs can be adequately tuned.
Environex will provide an overview of what AIG tuning is, when it should be done, the system design and operating factors that influence how effective AIG tuning will be, and required system maintenance to ensure that AIG tuning results will be maximized.
Your NOx conversion and ammonia slip requirements are the primary factors that determine if your plant is a viable candidate for AIG tuning. We will show how to evaluate this and the importance of reviewing plant operating data to monitor parameters such as ammonia efficiency that provide insight into when it is time to tune your AIGs. This includes assessing which operating condition (minimum load, full load, duct-fired, etc.) you should tune for to get optimal results for your operating profile. We will also highlight the importance of proper maintenance of the SCR and CO catalysts, AIG nozzles and piping, and the ammonia vaporizer before AIG tuning to ensure that tuning is necessary and that its benefits can be fully realized.
The presentation will cover the impact AIG design has on system tunability, as well as the plant equipment requirements and functionality needed for tuning. This includes the number and size of ports downstream of the catalyst for emissions traverse measurements (or permanent sampling grid if available), accessibility of the ports, and operability of the distribution manifold valves and dP gauges. The presentation will include a case study that demonstrates how effective AIG tuning can be with proper maintenance, project planning, and evaluation of system operating requirements.