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Taikisha - Direct-Fired Thermal Oxidizer
The most basic type of thermal oxidizer is a direct-fired thermal oxidizer, also known as an afterburner. As the simplest type of thermal oxidizer, it does not include any heat recovery, heat exchanger, scrubber, adsorbent, or catalyst material. It offers the lowest upfront capital investment cost, but is thermally inefficient, so it requires the most energy to operate. Other thermal oxidizer designs implement a heat recovery mechanism or catalyst to reduce the required reaction temperature.
Due to the lack of heat recovery, this design is best suited for applications with a very high concentration of VOCs or applications that only need to run for a small percentage of time. If the exhaust stream has a high concentration of VOCs and can run nearly steady-state with little to no supplemental natural gas required, then a direct-fired thermal oxidizer is a good choice. Often times, the direct-fired thermal oxidizer is used in combination with a VOC concentrator to provide the highly-concentrated solvents. The direct-fired type oxidizer offers a destruction efficiency of 99%.