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In page Thermal oxidizer:

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Also called afterburners in the cases where the input gases come from a process where combustion is incomplete,[2] 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.[citation needed]