Ammonia Injection Grid (AIG) Tuning Services

Evonik Steag GmbH provides ammonia injection grid (AIG) tuning services to  

• Optimize the operation of the AIG Punkt 1
• Minimize ammonia (NH3) slip
• Reduce O&M costs
  

Our service directly applies what Evonik Steag  has learned and developed during the past 20 years while tuning our own 24 SCR units.  Our goal is to maximize the NOx removal efficiency while ensuring as little NH3 slip as possible.

A team of Evonik Steag experienced technicians and engineers test each unit’s AIG under actual full-load operating conditions. Using the fixed installed sampling grid after the last catalyst layer, they conduct a series of tests during which the AIG tuned until the SCR is operating at peak performance.  In general, we recommend an optimization of the flue gas distribution and tuning once a year.

Providing quasi-simultaneous flue gas analysis over the SCR’s entire cross section area by operating up to seven NO/O2 analyzers in parallel, Evonik Steag’s ECOS accurately determines the NO and O2 concentrations in the flue gas at up to 100 measuring points within 45 minutes. The results are directly converted online into a three dimensional concentration profile in order to allow a correct evaluation of the found distribution which then can be optimized.

 

Evonik Steag’s ECOS systems multiple analyzers yield significant advantages:

Up to 7 sampling points can be measured in parallel thus providing real time NO distribution along one SCR axis at any time. Online correction of trends and fluctuations in the NO inlet concentration by generating a single NO reference point at all times. A 3-dimensional NO profile can be generated  in real time allowing for easy and accurate balancing of the AIG valves.  All NO measurements are O2 corrected for fully comparable NO values by canceling out dilution effects due to varying O2 contents. A O2 profile generated in parallel  allows for detection and identification of  leaking or otherwise faulty sampling lines as well as possible imbalances in the air distribution of the combustion system.

ECOS AIG Testing Truck ECOS NO Measuring Grid