09/2020 Exhaust Gas Treatment for Low Pressure Carburizing Applications

Low pressure carburizing equipment is used with acetylene (C₂H₂) or propane (C₃H₈) as a carbon donator. Tthe parts absorb only approx. 60% of the carbon offered during the process. This leads to a higly energetic exhaust gas containing beside the original gases also   polycyclic aromatic hydrocarbons and other harmful compounds. The German Federal Immission Control Act (BImSchG) interdicts to release these substances into the environment.

The development of a suitable abatement system had to consider the pulse-like concentration changes of the exhaust gas with a very high energy content for only a few minutes and long periods of time with very low organic concentration. Furthermore, the equipment had to be electrically heated and therefore extremely energy-efficient.

These requirements led to the design of the electrically heated thermal oxidation system ETNV 100, which is in operation at several automotive customers in Europe, Aisa and America. By means of a well dimensioned heat recovery system energy consumption could be minimized.

The purified exhaust gas is handed over at a temperature of less than 400 °C in order to work with standard stainless steel ductwork. Compact design on a steel frame allows rapid integration into the production cycle with very short down-time. All relevant process data are supplied by profinet or profibus for display on the customer's process control system.