AIG Tuning and Optimization

As part of our SCR management program, SCR-Tech provides ammonia injection grid (AIG) tuning services to optimize the operation of the AIG and reduce O&M costs. A team of experienced technicians and engineers will test the unit’s AIG under actual operating conditions and then, using the fixed installed sampling grid after the last catalyst layer, a series of tests will be conducted for tuning the AIG until it is operating at peak performance. We recommend an optimization of the flue gas distribution and tuning of the ammonia injection grid (AIG) at least once a year and prior to the start of each ozone season utilizing a MAFGAS (mobile automated flue gas analysis system) which is used to measure the NO and O₂ distributions after the last catalyst layer

The MAFGAS system is used for fine tuning the ammonia injection grid, the investigation of load dependent NO operating points and possibly the determination of the NO_x reduction efficiency of a single catalyst layer. Providing quasi-simultaneous flue gas analysis over the SCR’s entire cross-sectional area by operating up to six (6) NO/O₂ analyzers in parallel, the MAFGAS accurately determines the NO and O₂ concentrations in the flue gas at up to 100 measuring points within thirty (30) minutes using the fixed sampling grid installed after the last catalyst layer. 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.

Mobile Automated Flue Gas Analysis System (MAFGAS)

Graph courtesy of E.ON Engineering

Minute monitoring of NH3 slip through NH3 in the fly ash is essential for tracking the SCR system performance and the catalyst deactivation.

Graph courtesy of E.ON Engineering

operating hours