Recent Projects Performed by SCR Solutions

LM6000 Simple Cycle SCR Retrofit

SCR Solutions LLC was selected to investigate and optimize the existing SCR performance on a simple cycle LM6000 unit in California.  The system was having performance problems with high ammonia slip and high stack NOx that limited operation under certain conditions.  In addition, the plant will be subject to tighter NOx emissions in 2024 so the following were provided by SCR Solutions LLC:

  • Internal Inspections
  • CFD Modeling
  • Detailed Engineering and Supply
  •     New Perforated Plate
  •     New Flow Distribution Devices
  •     Updated AIG design
  • Detailed specifications for new SCR catalyst
  • Construction Management


SCR AIG Tuning & Inspection

SCR Solutions provided detailed NOx measurements and AIG tuning for a 2x1 combined cycle plant in Texas.  The plant was experiencing high ammonia slip and poor NOx control under certain operating conditions since startup in 2014.  SCR Solutions utilized our Top Traverse Method to obtain a detailed map of the NOx, O2 and ammonia slip distribution at the SCR.  The results indicated some suspicious areas where gas bypass might exist.

A follow up inspection was performed during a scheduled outage and areas of significant gas bypass regions.  SCR Solutions is working with the plant to repair the problems and solve the performance problems. 


HRSG/SCR Testing

SCR Solutions provided detailed NOx, temperature and ammonia slip measurements 1x1 combined cycle plant in Ohio.  The plant was experiencing high ammonia slip and poor NOx control when duct firing, thereby limiting operation.  SCR Solutions utilized our Top Traverse Method to obtain a detailed map of the NOx, O2, ammonia slip distribution at the SCR.  The results indicated high ammonia slip specifically in line with the damaged upstream HRSG baffles.  High temperature flue gas was getting to portions of the SR catalyst that limited its overall performance. 

After the SCR Solutions’ recommended repairs were made to the HRSG baffles, the unit was able to comfortably operate with duct firing with no limitations on operation. 

More details can be found in a recent article published in the Combined Cycle Journal: https://mertecindustrial.com/repairs-to-gas-baffles-between-hrsg-tube-panels-restore-scr-performance/

Plan Update Release

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