Since the installations at the former coke plants August Thyssen and since 2003 at the most modern plant Schwelgern the PROven (Pressure Regulated Oven) system has been used worldwide for emission reduction. With the pressure in the coke ovens adapted to the individual carbonization status the fugitive emissions are lowered considerably. Also during charging of ovens nearly no visible emissions do appear. This is because of the suction in the g. c. main that is used very effectively for charge gas transfer. Until today more than 2000 ovens worldwide have been equipped with the PROven system. Simultaneously several developments and improvements were integrated.

1. Bast, C.-J.; Köhler, I.; Schücker, F.-J.; Schulte, H.: Reduzierung von Emissionen beim Füllen — Möglichkeiten, Maβnahmen und Erfahrungen, Fachtagung der Kokereitechnik 1996, 25./26. April 1996, Essen.
2. Farrenkopf, M.: Koks — die Geschichte eines Werkstoffes, Band I, Deutsches Bergbaumuseum, Bochum, 2003.
3. Giertz, H. J.; Huhn, F.; Hofherr, K.: New process to avoid emissions: constant pressure in coke ovens, Ironmaking Conf. Proc. 54, 2.–5. Apr. 1995, Nashville, USA, S. 439/45.
4. Wemhöner, B.; Spitz, J.; Hofherr, K.; Giertz, H. J.; Liesewitz, F.; Huhn, F.: Start of chamber pressure regulation system PROven at coking plant August Thyssen: installation and operational experiences, Proc. 4th Europ. Coke and Ironmaking Congr., Vol. 2, 19.–22. Juni 2000, Paris, Frankreich, S. 470/74.
5. Huhn, F.; Krebber, F.; Reinke, M.; Schulte, H.: MPT Internat. 33 (2010) Nr. 4, S. 26/29.
6. Huhn, F.; Krebber, F.; Reinke, M.; Schulte, H.: Einzelkammerdruckregelung PROven und Weiterentwicklungen, Fachtagung Kokereitechnik 2010, 29./30. Apr. 2010, Essen.