Technical Committee Fuel Oils
Deposit formation in pre-mixing burner systems - investigation of the cause and minimisation by modifying the evaporator surface
The aim of the present study was to reduce the formation of deposits in premixing
combustion systems under the requirement that any change of the operation
conditions of the technical system is avoided. The method was to physically and
chemically modify the heated metallic surface by the following treatments: variation of
roughness, coating and oxidation. The deposit formation was examined by pulsed
evaporation and the continual evaporation of a spray on a hot surface. A minor
reduction of the deposits was denoted for the oxidized surfaces in the pulsed
evaporation test. With both test methods it was possible to distinguish the examined
low Sulphur light heating oil (LHO) with respect to their inclination to form deposits
during evaporation. Two fuels were fractionated by distillation and the fractions were
tested. These experiments showed that deposits are mainly due to fuel components
with boiling range above 360 °C. There are indications that the amount of deposits
correlates with the aromatic hydrocarbon content of the fuels.
The IGF project (17600 N) of the research association DGMK Deutsche Wissenschaftliche Gesellschaft für Erdöl, Erdgas und Kohle e.V., Überseering 40, 22297 Hamburg was funded by the Federal Ministry for Economic Affairs and Energy via the AiF within the framework of the programme for the promotion of joint industrial research (IGF) on the basis of a resolution of the German Bundestag.