Ammonia Scrubbers for CEMS

What is An Ammonia Scrubber and What Is It Used For?

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An Ammonia Scrubber is used for CEMS Sample Conditioning Systems to eliminate the ammonia present in the sample gas coming off exhaust or flue gas streams that include SCR (Selective Catalytic Reduction) to remove NOx. The scrubbers remove the excess ammonia to improve the reliability of the complete CEMS including its Sample Conditioning System and lower the cost of operation.

How it works: A Very selective reagent – H3PO4 (Phosphoric acid) deposited on inert ceramic removes only bases as the sample gas is routed through the scrubber.  See the flow diagram below:

What It Does:

  • Protects analyzers and downstream components
  • Eliminates ammonia salt deposition
  • Very high corrosion resistance of the stainless steel or polysulfone housing stands up to corrosive sample gases
  • Reliable and low maintenance with no moving parts and only periodic refills

Used In Two Major Applications:

  • Nafion-based Sample Conditioning Systems to eliminate the ammonia in the gas stream before it is routed to the dryer.
  • Cooler-based Sample Conditioning Systems, either ahead of the cooler or between the cooler and the analyzer to improve system reliability in case the cooler fails and to reduce the amount of ammonia that the cooler sees, and to eliminate the possibility of acid mists forming.

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