4. The location of sulphur-nitrogen interactions
The previous sections have shown that sulphur can appreciably modify the emissions of nitrogenous compounds. However, emissions are the final result of various different processes occurring in different conditions of temperature, stoichiometry and flow dynamics along the furnace duct. Therefore, a knowledge on where and to what extent sulphurous species are able to modify the concentrations of nitrogenous species along the combustion chamber is advisable.
The following set of experiments aimed at determining the location at which N-S interactions occur in the drop-tube furnace. Sampling of combustion gases from a heavy coker gas oil was performed at selected probe positions and with and without the addition of 2 % S as SO2-gas .
The experimental conditions were similar to those in previous paragraphs (see "2. Experimental procedure"). However, only the heavy coker gas oil M1 was burnt with and without the addition of 2 % S as SO2-gas only (see "Appendix II" for analyses of this fuel). This fuel was deemed to be representative of the family of heavy gas oils used in other sections of this thesis.
Sampling of the combustion gases was performed at various positions along the furnace duct, from 100 mm to 500 mm distance from the atomiser block in steps of 100 mm.
The handling of the experimental results was performed in a similar way to other sections. Graphs showing the concentrations of the various species measured at the points of sampling are presented in the following paragraphs.
Pollutant formation and interaction in the combustion of heavy liquid fuels
Luis Javier Molero de Blas, PhD thesis, University of London, 1998
© Luis Javier Molero de Blas
