A burner includes a burner front having annular and central openings. The annular opening, for discharging a solid fuel, fluidly connects to a central passage way. The central opening, for discharging an oxygen containing gas, fluidly connects to an annular passage way for passage of oxygen positioned co-axial with the central passage way. The central passage way has a downstream part and a diameter that increases over a first length and subsequently decreases over a second length terminating at the burner front. Inside the downstream part a hollow member is positioned which is closed at one end and has an opening at or near the burner front, and has increasing and decreasing diameters aligned with the increasing and decreasing diameters of the central passage way forming an annular passage. The hollow member fluidly connects with the annular passage way for the oxygen containing gas via one or more connecting conduits.