322-328The pneumatic powder injection is well-known and
widely used with injection lances submerged into metal bath. However, sometimes
better is to not introduce the lance below the liquid metal surface because of
the metal splashing and introducing of gases into metal volume. In such a case
non-submerged lance is used but the problem with particles jet penetration into
the metal volume appears. This paper presents the results of the studies on the
pneumatic powder injection with non-submerged lance. The high-speed camera
recording of the model diphase jet leaving the lance is carried out.
Then image analysis is performed to estimate real particles motion parameters.
Furthermore, the jet cone is analysed to check its character of development and
compared with the reported results in the literature. The results are obtained
that the particles real velocity is smaller than calculated from typically used
formulas. The same with cone angles – it seems to be different than quoted in
the literature. Next stage is numerical modelling using AnSys software. The
results were compared with the experiments and the model is adjusted. The next
stage is ferroalloy “cold” injection and again the computer modelling. The last
stage is FeSi injection into grey iron experiments. The analysis of the results
is combined both with the laboratory results and modelling then compared with
previous data. As a consequence the validated numerical model is obtained which
can be helpful for the injection process planning in industrial conditions