page_title: Thermal oxidizer
section_title: Direct fired thermal oxidizer - afterburner
hierarchical_section_title: Thermal oxidizer / Technologies / Direct fired thermal oxidizer - afterburner
caption_attribution_description: English: Basic thermal oxidizer (direct fired) using landfill gas as fuel to heat and oxidize the waste gas as a result of landfill gas processing to separate methane to supply a gas line.
context_page_description: A thermal oxidizer is a process unit for air pollution control in many chemical plants that decomposes hazardous gases at a high temperature and releases them into the atmosphere.
context_section_description: The simplest technology of thermal oxidation is direct-fired thermal oxidizer. A process stream with hazardous gases is introduced into a firing box through or near the burner and enough residence time is provided to get the desired destruction removal efficiency (DRE) of the VOCs. Most direct-fired thermal oxidizers operate at temperature levels between 980 °C (1,800 °F) and 1,200 °C (2,190 °F) with air flow rates of 0.24 to 24 standard cubic meters per second.
  Also called afterburners in the cases where the input gases come from a process where combustion is incomplete, these systems are the least capital intensive, and can be integrated with downstream boilers and heat exchangers to optimize fuel efficiency.  Thermal Oxidizers are best applied where there is a very high concentration of VOCs to act as the fuel source (instead of natural gas or oil) for complete combustion at the targeted operating temperature.
caption: Direct-fired thermal oxidizer using landfill gas as fuel[3]
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