Savings in energy consumption of around 80%
May 2012 – Dürr’s Environmental and Energy Systems business unit optimizes exhaust air purification for the automobile industry and aligns it perfectly to the latest oven and painting processes.
During the painting and drying of vehicle bodies pollutants are produced in the form of gases, which need treatment suitable for the paint system involved and the statutory guidelines that must be complied with.
Recuperative thermal oxidizers, such as the Dürr Ecopure TAR, are the best air purification systems for handling oven exhaust air streams, as the heating energy contained in the purified gases can be reused in the drying process. One especially important part of the system is POWERFLEX, its adjustable heat exchanger. It allows the exit temperature of the purified exhaust air to be controlled independently of combustion chamber temperature. Because the operating point of the system is variable, the TAR exit temperature can be lowered during production breaks, for example, in order to save energy – without causing any loss in the quality of the purified gas!
The Ecopure TAR is also used for the purification of exhaust air from painting booths. As the volumes of exhaust air streams produced during the painting process are especially large but their pollutant loads only small, ideally, a purification system with integrated concentrator (Ecopure KPR) for these solvent laden exhaust air streams is installed after the paint booth. The volume of the exhaust air stream to the subsequent thermal purification system is thus very much reduced. The increased pollutant concentration achieved allows gas consumption to be reduced significantly, as the energy contained in the pollutants can also be utilized in the oxidation process.
More and more automobile paint shops are working with Dürr’s innovative EcoDryScrubber dry separation system, which binds excess paint particles in dry filters – i.e. without contact with water. This system not only reduces paint shop energy consumption by up to 30% but also offers benefits for exhaust air purification, as the exhaust air from the EcoDryScrubber is also highly concentrated and efficiently filtered.
For Dürr customers this means lower investment costs and savings in energy consumption of around 80%.