Regenerative thermal oxidizer (RTO)

Regenerative thermal oxidizer (RTO) is usually applied in the purification of exhaust gases from offset printing, gravure printing and flexographic printing as well as painting and lamination processes. The exhaust air treatment is based on a flameless oxidation at the temperature above 800°C. A compact housing normally contains three heat-exchanging chambers which are fitted with storage elements in the form of high-quality honeycomb bodies.

Cold streams of exhaust gases are passed through the honeycomb body and heated up to the total oxidation temperature. After complete pollutant conversion to the carbon dioxide and water in the incineration chamber the purified air is directed into the next chamber where the excessive heat is transferred to the ceramic material. The auto-thermal operation is to be quickly achieved due to high efficiency of the heat exchanger.

Three-dimensional display of regenerative thermal oxidizer

Exhaust air flow	30.000 Nm3/h
Pollutant type, VOC	EtOH/EtAc
Pollutant heating value	26.800 kJ/kg
Pollutant concentration	0 – 8 g/Nm3
Exhaust air temperature	50 °C
Fuel type back-up burner	Natural gas
Gas flow pressure	80 – 150 mbar
Oxidation temperature approx.	840
Heat exchanger degree of efficiency	95,5 %
Gas consumption with 0 g/Nm³ solvent	55 Nm³/h
Gas consumption with 1 g/Nm³ solvent	31 Nm³/h
Gas consumption with 2 g/Nm³ solvent	7 Nm³/h
Gas consumption with 2,3 g/Nm³ solvent	0 Nm³/h
Average clean gas temperature	~100 °C
Remaining pollutant concentration total C	< 20 mg/Nm3
Remaining pollutant concentration CO	< 100 mg/Nm3
Remaining pollutant concentration NOx	< 100 mg/Nm3
Electrical connection	380-410 V / 50 Hz / 3 Ph +N
Electric power requirement exhaust air fan	65 kW
Total installed power consumption	81 kW
Compressed air volume flow (6-7 bar, dew point min. –40°C)	16 l/min.
Length x Width x Height approx. [m]	7,8 x 6,0 x 4,8
Weight approx.	45 t
*data based on the RTO type of 30.0, printing industry