Callidus Technologies - part of UOP, a Honeywell Company

De-NOxidizer Systems



Thermal oxidation of nitrogen-bearing wastes require a specialized combustion approach. Single-stage combustion of these wastes can produce NOx emissions in excess of those allowed by most regulatory agencies. To maintain NOx emissions within acceptable limits, our De-NOxidizer systemuses a multi-stage process to destroy wastes.

  • The waste is burned in the first stage under substoichiometric, or reducing conditions. The high temperatures and lack of oxygen in the first stage cause the nitrogen-bearing compounds to form elemental nitrogen rather than NOx.
  • In the second stage, flue gas from the first stage is cooled to approximately 1400∞F by injection of water, steam or cooled recycled flue gas.
  • The combustion process is completed in stage three where the flue gas is oxidized at a temperature of 1700˚F to 2000˚F with excess oxygen present. NOx in the final flue gas typically ranges from 80 to 200 ppm depending on the waste composition. A destruction efficiency of 99.99 percent can be achieved for most compounds

Low NOx Thermal Oxidizer
Typical Equipment

  • High intensity burner
  • Brick lined furnace
  • Forced draft
  • Heat recovery equipment
  • Multi-stage process

Typical Waste Streams

  • Ammonia vents
  • Acrylonitrile vents
  • Nitrogen bound organic wastes

Representative Installation

  • Petrochemical plant in India
  • 10-60 MM BTU/hr
  • 2.0 seconds residence time
  • 2200˚F/1600˚F operating temperatures

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