Abatement by afterburner of VOCs generated by solvent-based release agent dust emissions.
- Plant type: VOC extraction and filtration
- Air flow rate: 20,000 cu m/h
- Filter Type: Bag Prefilter mod. AIRCOM, Afterburner
- Fan: 45+30 kW
General description
A plant for abatement of VOCs from release agent application robots was realized by combining the effectiveness of a bag filter and an afterburner.
The polluted air flow is initially taken to a bag prefilter, which removes any residual dust resulting from processing. After that, a thermal regenerative afterburner is employed to abate volatile organic substances and VOCs with high efficiency. Finally, a high-efficiency fan creates the necessary vacuum to ensure suction and convey filtered air outside via an exhaust stack.
Afterburner design data
| Air flow rate | 20,000 Nm3/h |
| Flue gas inlet temperature to be treated | 20-30°C |
| Combustion temperature | 850 °C |
| Available fuel | Network methane |
The plant is intended to treat 20,000 Nm3/h of air polluted by the presence of solvents at a temperature of 20°C. The combustor is equipped with a blower to provide constant air flow, while the combustion chamber is equipped with insulating brick lining and ceramic fiber panels. The design temperature of the afterburner is 850°C, sized for a dwell time of 1 second, so as to allow complete oxidation of the contained volatile organics. A gas burner is used, with modulating operation, capable of operating even with considerable excess air.
Principle of operation of the afterburner
When the working temperature of approx. 850°C is reached, the process valve is opened. The air to be purified enters the 1st heat exchange tower and removes heat from the superheated ceramics, which cool down.
At a temperature close to the process temperature, air enters the combustion chamber where, due to the effect of the input fuel, the set thermal level is reached.
At the outlet, air at 850°C yields heat to the second combustion chamber, and at a temperature of 90 to 100°C is drawn in by the fan and expelled from the chimney.
This cycle lasts about 60 seconds after which there is an exchange of the IN/OUT valves allowing the air to be treated to enter via the 2nd recovery chamber which is currently at temperature.
Hot gases leaving the combustion chamber enter the IIIrd recovery chamber and cool down. Every 60 seconds the cycle repeats.
