A Regenerative Thermal Oxidizer (RTO) is an industrial grade air pollution control device designed to decompose Hazardous Air Pollutants (HAPs), Volatile Organic Compounds (VOCs), and other airborne emissions into CO2 and water vapor by heating exhaust air to temperatures over 1,400°F. It is the preferred oxidizer technology for most applications due to its high destruction efficiencies and its ability to recover most of the thermal heat that is generated in the destruction of VOCs and HAPs. Oxidizers come in many different sizes, shapes, and configurations but all operate on the same basic principal of thermal oxidation.

The GeoTherm® II RTO provides the highest performance possible to maximize collection efficiency, minimize maintenance requirements, and provide the protection necessary for trouble-free operation of the emission control systems.

A Regenerative Thermal Oxidizer (RTO) is an industrial grade air pollution control device designed to decompose Hazardous Air Pollutants (HAPs), Volatile Organic Compounds (VOCs), and other airborne emissions into CO2 and water vapor by heating exhaust air to temperatures over 1,400°F. It is the preferred oxidizer technology for most applications due to its high destruction efficiencies and its ability to recover most of the thermal heat that is generated in the destruction of VOCs and HAPs. Oxidizers come in many different sizes, shapes, and configurations but all operate on the same basic principal of thermal oxidation.

The GeoTherm® II RTO provides the highest performance possible to maximize collection efficiency, minimize maintenance requirements, and provide the protection necessary for trouble-free operation of the emission control systems.

Examples of typical
hydrocarbon compounds

Examples of Conversion of
VOC to inert compounds

C6H14O2
C3H6O
C6H6
C4H10O
C6H12O
CH2O
C7H16
C5H12

Examples of Conversion of
VOC to inert compounds

CH2O + O2 > CO2 + H2O
C7H16 + 11O2 > 7CO2 + 8H2O
2C6H14 + 19O2 > 12CO2 + 14H2O

Regenerative Thermal Oxidizer Basics

RTOs treat contaminated gas streams with high temperature to oxidize the organic compounds along with the energy saving regenerative process described below.

A system of diverter valves located at ground level control the direction of flow of the gas stream being treated. This valve system acts to direct the gas stream into and out of heat recovery chambers located directly above the valves.

Each heat recovery chamber is a vertical section filled with ceramic media. Working in tandem, the diverter valves alternate the direction of flow through the unit on a pre-determined cycle. This back-and-forth regenerative operation allows RTOs to recover up to 97% of the heat generated in the burner chamber and greatly minimizes fuel costs.

With reference to the diagram below, the inlet emission stream passes through the inlet heat recovery chamber where it is preheated to a temperature very near the burner chamber temperature. In the burner chamber, a natural gas burner maintains the temperature at between 1,400ºF and 1750ºF, the temperature required for complete thermal oxidation.

What Does a Regenerative Thermal Oxidizer Do?

Upon exiting the burner chamber, the emission stream enters the outlet heat recovery chamber. The gas stream passes through the outlet heat transfer media bed where the heat energy gained from the inlet heat recovery chamber and burner chamber is transferred to the ceramic heat exchange media (heat sink). This is the final step in the regenerative process. Typical discharge temperatures from RTO systems are approximately 75ºF above the inlet temperature. Finally, the emission stream exits the RTO system through the outlet diverter valve and is transferred to the stack via the induced draft fan.

GeoTherm® II RTO

The GeoTherm® II RTO system is a state-of-the-art air pollution control device that has been used successfully for over 20 years for the removal of VOCs and HAPs from multiple industrial applications.

The GeoTherm® II RTO uses multiple poppet-style diverter valves located at ground level to control the direction of flow through the RTO unit. These valves act together to direct the gas stream into and out of heat recovery chambers located directly above each valve.

Features

GeoTherm® II RTO System Benefits

  • 95 to 97% thermal efficiency (TER)
  • Up to 99% destruction efficiency (DRE)

  • Customized Ceramic Media Bed Configuration – plugging / chemical corrosion resistant
  • Simple, fast-acting poppet valve design

  • Resists condensation of organics on the poppet valve – valve remains hotter than the inlet gas stream, remaining free of buildup
  • Minimal moving parts per Heat Recovery Chamber (HRC) – Only one (1) poppet valve per HRC, i.e., only two (2) valves per RTO

  • 95 to 97% thermal efficiency (TER)
  • Up to 99% destruction efficiency (DRE)
  • Customized Ceramic Media Bed Configuration – plugging / chemical corrosion resistant
  • Simple, fast-acting poppet valve design
  • Resists condensation of organics on the poppet valve – valve remains hotter than the inlet gas stream, remaining free of buildup
  • Minimal moving parts per Heat Recovery Chamber (HRC) – Only one (1) poppet valve per HRC, i.e., only two (2) valves per RTO

Industries Served

  • Carbon Fiber
  • Chemical Manufacturing
  • Pharmaceutical
  • Automotive
  • Petrochemical

  • Foundry
  • Styrene
  • Waste Water Treatment
  • Printing & Flexography
  • Flooring

  • Pulp & Paper
  • Rendering
  • Ethanol
  • Oil & Gas
  • Semiconductor

Engineered Wood Products

Fiber Manufacturing

Fiberglass/Mineral Wood Insulation

Surface Finishing/Coating

  • Carbon Fiber
  • Chemical Manufacturing
  • Pharmaceutical
  • Automotive
  • Petrochemical
  • Foundry
  • Styrene
  • Waste Water Treatment
  • Printing & Flexography
  • Flooring
  • Pulp & Paper
  • Rendering
  • Ethanol
  • Oil & Gas
  • Semiconductor
  • Engineered Wood Products
  • Fiber Manufacturing
  • Fiberglass/Mineral Wood Insulation
  • Surface Finishing/Coating

To learn more about the GeoTherm® II RTO