De-NOxidizer Systems
From Thermal Oxidizers
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.
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The waste is burned in the first stage under subst...
- 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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