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Regenerative Thermal Oxidizers

EnviroAir designs custom Thermal Oxidizer systems including Regenerative Thermal Oxidizers. We specialize in turnkey installations of environmental air systems and can provide single source responsibility for the design, fabrication, installation and startup of your thermal oxidizer system.

The Regenerative Thermal Oxidizer shown here was fabricated from Titanium. It is treating brominated hydrocarbons from process vents at a chemical manufacturing facility. The titanium construction is resistant to the highly corrosive hydrobromic acid gas created during the oxidization of the brominated hydrocarbons. The RTO system was furnished with a downstream Packed Bed Scrubber and integral quench.

Description of Regenerative Thermal Oxidizers

Regenerative Diagram

A typical two-bed regenerative thermal oxidizer is shown here. The forced draft fan (A) draws in process air and discharges it to the RTO inlet manifold. Two poppet valves (B) are located beneath the two heat recovery beds (C). One poppet valve directs the process air into its corresponding heat recovery bed. Through this bed the air picks up heat stored in the bed which preheats the process air. Typical heat recovery efficiency of the RTO is 95%. After the air is preheated through the first bed, it enters the combustion chamber (D). The combustion chamber is maintained at the design set point temperature where the hydrocarbons in the process air are converted to carbon dioxide and water vapor. The hot clean air then flows downward through the second heat recovery bed where it gives up energy and heats the bed of ceramic media. The second poppet valve directs the air out of the bed and into the outlet manifold and up the stack (E).

Periodically the poppet valves switch positions and the flow through the heat recovery beds is reversed. This is to take advantage of the heat stored in the second bed and to replenish heat to the first bed. This valve switching is done automatically by the RTO control system.

The RTO has a burner system to maintain the RTO at the design set point temperature. The burner system consists of a gas train, burner, and natural gas injection system. The burner (F) is used to warm up the RTO at start up. During normal operating conditions, the natural gas injection system is used to maintain temperature. The natural gas injection system adds fuel into the ductwork upstream of the forced draft fan as needed. The benefits of natural gas injection include reduced NOx emissions and lower operating costs as no combustion air is needed for burner operation.