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Module 6: Air Pollutants and Control Techniques - Dioxins and Furans - Control Techniques
Contents
Lesson Material
Practice
Problems
Objective
- Explain how concentrations of dioxin and furan compounds can be reduced.
Combustion studies indicate that both dioxin and furan compounds are destroyed when the gas temperatures exceeds approximately 1400°F. In fact, oxidation of these compounds is completed at lower temperatures than some other forms of partially oxidized compounds as indicated in Figure 1. These temperatures usually exist in the combustion zones of incinerators and fossil-fuel-fired boilers.
The formation mechanisms decrease to negligible rates when the gas stream temperature decreases below 400°F. Accordingly, ensuring that the gas stream is sufficiently cooled prior to the air pollution control system can eliminate this formation mechanism. Cooling is accomplished in the heat recovery equipment (economizers and air preheaters) or in the incinerator waste heat boilers.
The best way to control dioxin and furan emissions is preventing their formation by reducing or eliminating the chlorine in the fuel and waste material being burned.
Practice Problems
Dioxins and Furans - Control Techniques
- Instructions:
- Complete the Practice Problems before proceeding to the next lesson. Click on the button below.