Depuration goals are mainly to reduce dangerous VOC emissions into the atmosphere, respecting the foreseen limits for each pollutant, without creating secondary pollutants and with acceptable capital and handling costs while recovering usable energy directly in the production process that generates the emission.
To resolve the environmental problem and obtain an interesting energy recovery, regenerative thermal oxidation was combined with a heat generator capable of exploiting the excess energy generated in the oxidation process.
Regenerative thermal oxidation is a chemical process that allows – with high temperature and the oxygen normally contained in the emissions – the transformation of organic pollutants into sub-products with reduced environmental impact: water and carbon dioxide.
Since the conversion needs a temperature up to 800-900°C, we foresee a particularly efficient energy recovery which – thanks to the use of specific ceramic filling materials – can limit operating costs bound to the use of auxiliary fuel feeding a dedicated burner.
In this application, the content of pollutants present is so high that the heat generated during the oxidation of Volatile Organic Compounds allows the oxidizer to work in autothermal mode. The heat is also available in excess to allow the heating of the diathermic oil used for the drying air in the printing machine. The heat generator therefore works not only using a traditional fuel (natural gas), but also by exploiting the heat present in the oxidizer combustion fumes.