A new burner concept was developed for the determination of the fuel bonded nitrogen in middle distillates. A completely premixed surface burner with low heat input was constructed.
The oxygen partial pressure has a substantial influence on the fuel nitrogen mechanism. The conversion rate of fuel bonded nitrogen to nitrogen oxides increases with rising availability of O2. The fuel mass flow (energy density) exhibits a similar behaviour.
A similar dependency between the conversion rate and the fuel bonded nitrogen content was determined for all the tested nitrogen compounds. The conversion rate decreases with increasing nitrogen content.
The test results of the developed method are reproducible and according to the standard DIN EN ISO 4259, for samples with a nitrogen content of ξN > 3 mgN/kgFuel..
The relative standard deviation of this method, considering the dependence of the conversion rate rN on the content of nitrogen using a fit-function rN(ξN), amounts to σnn < 5 %.