SCR Troubleshooting
Catalyst Brick Shifting
Elevated emissions, increased ammonia injection, and increased pressure drop are all signs of potential SCR catalyst problems. Environex has the knowledge and experience to differentiate between catalyst and system problems.
Upstream issues, such as CO catalyst plugging, can significantly impact SCR performance. Environex looks for all aspects of performance deterioration to determine the best solution based on a combination of an onsite inspection, operating data analysis, and catalyst testing.
Thermal Damage
Not all damage to the catalyst can be seen by a visual inspection. Catalyst sampling is used to diagnose these difficult cases. For example, catalyst core samples can determine whether the SCR catalyst is thermally damaged. Thermally damaged catalyst can trap system insulation and increase the pressure drop across the SCR catalyst.
Ammonia Injection Grid Salt Accumulation
Impurities in the ammonia solution or temperature changes in the ammonia vaporizer can lead to salt depositing in the ammonia injection system. This salt deposition can lead to increased ammonia consumption and high ammonia slip.
A further cause of pressure drop increase in the boiler is sulfate formation on the boiler tubes or air pre-heater. An onsite system inspection and data review can locate these salts and Environex can provide a solution.
Fouling on Boiler Tubes
