Burner for the partial combustion of a gas carried carbonaceous fuel, the burner comprising: a front face comprising a central aperture corresponding to a discharge end of the burner, a front side wall and a backside wall spaced by one or more baffles, the one or more baffles defining a coolant flow path with a first end provided with a coolant inlet and a second end having a coolant discharge outlet, wherein the front side wall and the one or more baffles are made of a single piece of metal, wherein the backside wall is welded on free top ends of the one or more baffles, wherein the burner further comprises a cylindrical central channel defined by a cylindrical inner wall disposed along a longitudinal axis and having a discharge outlet for supplying fuel gas to a combustion zone, wherein concentrically arranged around the inner wall is a cylindrical outer wall, the inner and outer wall (3, 5) having double walled upstream parts (3A, 5A) and single-walled downstream parts (3B, 5B), the inner and outer wall (3, 5) defining an annular coaxial channel for supplying an oxygen containing gas, wherein the burner further comprises a circular connection block, the inner and outer channel wall parts (3A, 3B, 5A and 5B) are welded to the connection block, and wherein the double walled upstream parts (3A, 5A) are arranged on an upstream side of the circular connection block and the single-walled downstream parts (3B, 5B) are arranged on a downstream side of the circular connection block, and wherein the inner channel wall parts (3A, 3B) are defined by inner wall parts of the double walled upstream parts (3A, 5A) and inner wall parts of the single-walled downstream parts (3B, 5B), and wherein the outer channel wall parts (5A, 5B) are defined by outer wall part of the double walled upstream parts (3A, 5A) and outer wall part of the single-walled downstream parts (3B, 5B). a front face comprising a central aperture corresponding to a discharge end of the burner, a front side wall and a backside wall spaced by one or more baffles, the one or more baffles defining a coolant flow path with a first end provided with a coolant inlet and a second end having a coolant discharge outlet, wherein the front side wall and the one or more baffles are made of a single piece of metal, wherein the backside wall is welded on free top ends of the one or more baffles, wherein the burner further comprises a cylindrical central channel defined by a cylindrical inner wall disposed along a longitudinal axis and having a discharge outlet for supplying fuel gas to a combustion zone, wherein concentrically arranged around the inner wall is a cylindrical outer wall, the inner and outer wall (3, 5) having double walled upstream parts (3A, 5A) and single-walled downstream parts (3B, 5B), the inner and outer wall (3, 5) defining an annular coaxial channel for supplying an oxygen containing gas, wherein the burner further comprises a circular connection block, the inner and outer channel wall parts (3A, 3B, 5A and 5B) are welded to the connection block, and wherein the double walled upstream parts (3A, 5A) are arranged on an upstream side of the circular connection block and the single-walled downstream parts (3B, 5B) are arranged on a downstream side of the circular connection block, and wherein the inner channel wall parts (3A, 3B) are defined by inner wall parts of the double walled upstream parts (3A, 5A) and inner wall parts of the single-walled downstream parts (3B, 5B), and wherein the outer channel wall parts (5A, 5B) are defined by outer wall part of the double walled upstream parts (3A, 5A) and outer wall part of the single-walled downstream parts (3B, 5B).