An apparatus for drying bulk particulate material, said apparatus comprising: a vessel capable of maintaining superheated steam at a pressure equal to or larger than the ambient pressure surrounding said vessel, said vessel defining a lower cylindrical part defining a first cross-sectional area being perpendicular to the length of the lower cylindrical part and an upper cylindrical part defining a second cross-sectional area being perpendicular to the length of the upper cylindrical part, an inner cylindrical part centrally located within said upper cylindrical part and said lower cylindrical part of said vessel for establishing a first fluid path from said upper cylindrical part to said lower cylindrical part within said inner cylindrical part and a second fluid path from said lower cylindrical part to said upper cylindrical part outside said inner cylindrical part, a first number of partitioning walls extending radially within said lower cylindrical part between said lower cylindrical part and said inner cylindrical part and defining in said lower cylindrical part an inlet chamber, an outlet chamber (38") and a second number of intermediate chambers located between said inlet chamber and said outlet chamber (38") in a circumferential direction, said inlet chamber comprising a inlet for receiving a moist bulk particulate materials, said outlet chamber (38") comprising an outlet for ejecting a dry bulk particulate materials, said inlet chamber and said intermediate chambers each defining a steam permeable bottom, said outlet chamber (38") defining a non-steam permeable bottom, a heat exchanger located within said inner cylindrical part for heating said superheated steam, an impeller for generating a flow of superheated steam along said first fluid path from said upper cylindrical part through said heat exchanger within said inner cylindrical part to said lower cylindrical part via said steam permeable bottom, and along said second fluid path from said lower cylindrical part to said upper cylindrical part outside said inner cylindrical part, characterised in that said steam permeable bottom of said inlet chamber is adapted to receive between 20% and 50% of said flow of superheated steam from said impeller, and in that said inlet chamber is larger than any of the intermediate chambers and hereby occupies a larger circular sector of the ring-shaped space between the lower cylindrical part and the inner cylindrical part. a vessel capable of maintaining superheated steam at a pressure equal to or larger than the ambient pressure surrounding said vessel, said vessel defining a lower cylindrical part defining a first cross-sectional area being perpendicular to the length of the lower cylindrical part and an upper cylindrical part defining a second cross-sectional area being perpendicular to the length of the upper cylindrical part, an inner cylindrical part centrally located within said upper cylindrical part and said lower cylindrical part of said vessel for establishing a first fluid path from said upper cylindrical part to said lower cylindrical part within said inner cylindrical part and a second fluid path from said lower cylindrical part to said upper cylindrical part outside said inner cylindrical part, a first number of partitioning walls extending radially within said lower cylindrical part between said lower cylindrical part and said inner cylindrical part and defining in said lower cylindrical part an inlet chamber, an outlet chamber (38") and a second number of intermediate chambers located between said inlet chamber and said outlet chamber (38") in a circumferential direction, said inlet chamber comprising a inlet for receiving a moist bulk particulate materials, said outlet chamber (38") comprising an outlet for ejecting a dry bulk particulate materials, said inlet chamber and said intermediate chambers each defining a steam permeable bottom, said outlet chamber (38") defining a non-steam permeable bottom, a heat exchanger located within said inner cylindrical part for heating said superheated steam, an impeller for generating a flow of superheated steam along said first fluid path from said upper cylindrical part through said heat exchanger within said inner cylindrical part to said lower cylindrical part via said steam permeable bottom, and along said second fluid path from said lower cylindrical part to said upper cylindrical part outside said inner cylindrical part, said steam permeable bottom of said inlet chamber is adapted to receive between 20% and 50% of said flow of superheated steam from said impeller, and in that said inlet chamber is larger than any of the intermediate chambers and hereby occupies a larger circular sector of the ring-shaped space between the lower cylindrical part and the inner cylindrical part.