CECO Adwest - Model RETOX -Regenerative Thermal Oxidizer (RTO) System - Tower-Type

The VOC laden air is directed by the poppet valve mechanism to flow through one or more beds into the combustion chamber. These beds have been previously heated and because of the intimate contact between the air and ceramic material, very high rates of heat transfer are produced. This results in the air being preheated very close to the required oxidation temperature by the time it reaches the combustion chamber.

The air then enters the combustion chamber where a small amount of heat is added by a fuel-fired burner to combustion temperatures. The thermal oxidizer then destroys the pollutants.

The clean air then exits the combustion chamber through another bed or beds that have been previously cooled. As the air passes through these beds it is cooled by the same heat transfer process. After passing through the cooled beds the air exits the RTO system at a temperature only slightly higher than the inlet temperature.

After several minutes the first set of beds (inlet) becomes depleted of heat while the second set of beds (outlet) becomes saturated with heat. At this point the flow of air through the beds is reversed with the formerly inlet beds acting as the outlet beds and the formerly outlet beds acting as the inlet beds. In this way each bed periodically extracts heat from the clean gas stream exiting the combustion chamber then releases this heat into the polluted gas entering the combustion chamber. This method is thermal regeneration. The combination of thermal oxidation and regenerative heat recovery allows the RTO Thermal Oxidizer system to efficiently destroy VOC laden air with minimal operating costs.

• Petrochemistry
• Spraying
• Rubber/Cementing compound
• Packaging/Printing
• Natural gas processing
• Pharmacy
• Biodiesel/Food
• Solar energy

1. RETOX RTO flameless NGI natural gas pre-injection (since 1988) with fuel saving >30%
2. RETOX 2 Room RTOs containing thermal bypass structure (since 1994)
3. Adwest RTO poppet valve design: 99%VOC destruction efficiency, zero leakage; Zero leakage Poppet Discs; 5 year Adwest Flow Control Warranty-Pneumatics & Poppet Valve;
4. Heat recovery materials put in order and in bulk pile can be both selected and used and heat recovery effectiveness can reach 97% (thermal storage materials in bulk pile)
   - Exhaust gas with heat recovery effectiveness of 95% has a self-balancing concentration 3.5% LEL;
   - Exhaust gas with heat recovery effectiveness of 97% has a self-balancing concentration 2.6% LEL;
5. Operating flexibility can reach 4:1 (if no external gas is added)
6. The treated flowrate for each set of RETOX RTOs ranges from 1000scfm to 70,000scfm in which 1000scfm to 10,000scfm can be skid-mounted for transportation;
7. Tower II, Tower II+ PuffBox, Tower III, Tower V and so on can be chosen according to different wind capacity and different working conditions