Study of the particulate matter emitted from residual oil combustion and natural gas reburning

in this work, a study of the particulate matter emitted from standard residual oil combustion and from natural gas reburning during oil combustion in a pilot scale furnace was carried out. the sizes, morphologies and chemical element distribution of particles were analyzed through scanning electron microscopy coupled to an x-ray energy dispersive spectrometer (eds). the microscopy results show three sorts of particles: spherical, very compact and smooth cenospheres with sizes of 0.6-1.5 mm; cenospheres with a few pores with sizes of 10-20 mm and larger porous cenospheres with sizes of 20-50 mm. the particulate emitted from standard oil combustion shows predominantly spherical and very compact small cenospheres, with a smooth surface, while those emitted from the reburning process present a majority of larger porous cenospheres. the eds microanalysis showed mainly al and si in the smaller cenospheres and mostly s and v in the cenospheres with a few pores and in the larger porous cenospheres.