Regenerative Thermal Oxidizers (RTO)

An installed regenerative thermal oxidizer unit

A regenerative thermal oxidizer (RTO) is an air pollution control device that destroys VOCs and hazardous air pollutants (HAPs) in industrial exhaust air. By using regenerative heat recovery, it achieves high fuel efficiency, often operating with 95% heat recovery.

Regenerative Thermal Oxidizers (RTO) are the technology of choice for most applications due to its high VOC destruction efficiency, low fuel use and long system life.
What are the types of ceramic media for an RTO?

There are two main types of ceramic media. Structured ceramic media is typically block-shaped, with ceramic materials configured in a geometric design. It is often placed in several layers. The other type of ceramic media is random-packed ceramic saddles. These smaller, U-shaped (also called saddle-shaped) ceramic pieces are also availiable in different sizes and are spread and leveled evenly across the media bed. Kono Kogs also offers custom media configurations, such as a hybrid media bed, to best fit the heat transfer and particulate requirements of each process and unit.

Can the flow capacity of ceramic media be increased?

It depends on some design factors that need to be scrutinized but typically, no. Advancements in new structured media designs can sometimes increase the thermal efficiency and reducing pressure drops through the media beds. This can sometimes can provide a couple percentage points of capacity increases over RTOs that utilize saddle ceramic media.

What causes hot spots on the outside of our RTO, and can they be fixed?

Hotspots typically result from damaged or missing insulation or compromised metal surfaces that allow heat to escape. KKI has experienced fabricators and insulators who can repair your oxidizer. This may involve replacing damaged metal to provide a secure base for reattaching insulation modules and restoring proper thermal protection.

At what temperature does a regenerative thermal oxidizer operate?

RTOs typically operate at 1500o – 1600o Fahrenheit depending upon the VOC characteristics. Thermocouples inside the chamber monitor temperature and adjust gas burner firing as needed. Adequate temperature is essential to ensure VOC destruction efficiency. In most cases a data log of chamber temperature is required for air quality compliance.

What can we do if there is a risk of ceramic media plugging due to condensing VOCs?

Using a bake-out feature can help prevent and remove organic compound buildup in the ceramic media, reducing the risk of plugging and maintaining efficient operation. A preheater or recirculation loop are also possible mitigation methods.

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