Technical Committee Fuel Oils

Influence of Evaporation Behaviour of Liquid Fuels on the Tendency to Coking on Wetted Surfaces

The main objective of the investigations was to identify differences between fuels with different deposition potentials. Purely thermal data such as the temperature-dependent heat capacity during evaporation and general physico-chemical parameters showed no significant differences between different heating oils. The evaporation behavior of the considered fuels has been experimentally investigated within the scope of the project using two common evaporation concepts (fleece evaporation, spray evaporation). In these investigations, a heating oil with a high deposition potential produced larger amounts of (poly)aromatic compounds during evaporation compared to a heating oil with a lower deposition potential. The characterization of the fuel oils with two-dimensional gas chromatography showed a comparable result and additionally showed that the fuel oil with the larger deposition potential contains more long-chain alkanes. In addition to the conscious generation of deposits, the project also investigated regeneration strategies for the subsequent removal of the resulting deposits. It was shown that, depending on the fuel used, complete regeneration, i.e. complete degradation of the deposits, is possible at temperatures between 300 °C and 540 °C. In this context, a model for the description of the evaporation of multi-component fuels was developed and verified within the framework of the project. The QDM is therefore a good model of the evaporation behavior of heating oils and is a suitable method for modeling the evaporation behavior of multi-component fuels.

The IGF project (18675 BG) of the research association DGMK Deutsche Wissenschaftliche Gesellschaft für Erdöl, Erdgas und Kohle e.V., Überseering 40, 22297 Hamburg was funded via the AiF within the framework of the programme for the funding of Industrial Collective Research (IGF) by the Federal Ministry for Economic Affairs and Energy on the basis of a resolution of the German Bundestag.