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Regenerative (RTO)REGENERATIVE (RTO)
A regenerative thermal oxidizer, also called an RTO is defined by NFPA 86 as “a combustion device where the burner(s) can directly heat the VOCs or hydrocarbons after the gas stream is preheated to the destruction temperature by the periodic flow reversal of the gas stream through heat storage media that alternately have been heated by the product gases during an exhaust cycle and then have given up their heat to the incoming reactant gases during an inlet cycle.” RTOs are often used in applications to destroy high volume low heating value waste gases. Typical applications include:

  • API Separator Vents
  • Biomass Dryer Vents
  • Equipment Off Gas

Regenerative Thermal OxidizerThere are different approaches to RTO design. Many manufacturers use 2 or 3 cans that contain ceramic media. The cans are connected by a network of automated valves that route the waste stream in the appropriate directions. EnviroPro represents Eisenmann which takes a different approach. Eisenmann’s design replaces the complex valve network with a patented rotary distributor that rotates at 1RPM and is called the VRTO for “Valveless Regenerative Thermal Oxidizer.” Instead of multiple cans, the ceramic media is held in a single vessel that is divided into multiple wedges. The waste stream is collected and directed through the VRTO by a variable speed fan. The rotary distributor is the only moving part in the system, and controls flow through the VRTO inlet, purge and outlet wedges in the heat exchanger section. The untreated stream is first directed up through the inlet wedge of the rotary distributor and the corresponding heat exchanger sections. This preheats the stream almost to the combustion chamber temperature as it travels up through the ceramic media. The stream is then oxidized in the combustion chamber using a modulating burner that provides additional heat only when required to maintain the combustion chamber temperature. The exhaust or outlet wedge of the rotary distributor allows clean oxidized air to flow downward through the exchanger. The exhaust gas heats up the ceramic media . The clean air exits the VRTO vessel and is sent to the exhaust stack. The purge wedge of the rotary distributor follows behind the inlet wedge, continually flushing the exchanger media with clean oxidized air.

The Eisenmann valveless design can provide 99% destruction efficiencies and thermal efficiencies up to 95%. Required maintenance is significantly reduced as it only has one moving part. It also has a reduced footprint compared to can type RTOs. This proven design has been installed in hundreds of facilities worldwide.

Give EnviroPro a call to learn more about the Valveless RTO.

Contact EnviroPro to discuss your oxidizer applications!