Zeitliche Darstellung des Alterungsverhaltens eines Oxidationskatalysators in einem Biogas-BHKW

The emissions released during the burning of biogas are subject to legal limits. In order to comply with these limits, exhaust aftertreatment is required by oxidation catalyst. Over time, decreasing pollutant conversion occur due to aging of the catalyst. Therefore, after only 1.5 years working time, compliance with the formaldehyde limit is no longer possible with certainty. The main reason is the deposition of inorganic compounds called oil ashes. These flue gas components from biogas engines block the catalytic active species and plugs pores.     

Explosionsschutz durch Inertisierung mit Wasserdampf bei gleichzeitiger Minimierung der Emissionen

The inertization of chemical reactors, in which flammable organic materials are handled, is usually achieved by purging with inert gases like nitrogen. The inertization with water steam is also possible, but limited to systems where water is also used as ingredient in the production process. Furthermore, it is more difficult to assure a uniform steam distribution in the system and particularly avoid condensation. An application for a steam inertization is described, which saves costs and significantly reduces the emission rates of the organic solvent. By this also the explosion stabilizing properties of water steam are used, e.g. the higher limiting oxygen concentration in a system steam/fuel/air than in systems with nitrogen/fuel/air.     

Stromerzeugung durch Kraft-Wärme-Kopplung — Perspektiven eines Betreibers

The basis for using the ecological an economic advantages of CHP in the city of Linz is the expanding district heating system and investment in newest CHP-combined cycle technology. Operating experience is excellent and emission reduction and pay back periods are reaching the targets.