Burner arrangement and burner assembly

A burner arrangement comprising a burner unit for providing a flame, and an elongated burner channel in close proximity to the burner unit, the burner channel forming a combustion space being configured to protect the flame and the burner unit, a fluid cooled copper block including a cooling conduit for circulation of the cooling fluid, the cooling conduit being inside the casted copper of the copper block, a first end of the burner channel to which the burner unit is releasably attached, and a second end of the burner channel, the burner channel extending inside the fluid cooled copper block from the first end to the second end, where the burner arrangement comprises a tubular mounting sleeve comprising anchor elements on the outer surface of the tubular mounting sleeve for anchoring the tubular mounting sleeve to a castable refractory material, where the tubular mounting sleeve is adapted to receive the fluid cooled cooper block inside the tubular mounting sleeve, where the outer surface of the fluid cooled copper block is conical so that its outer diameter decreases towards the second end, and where the inner surface of the mounting sleeve has a conical shape corresponding to the shape of the outer surface of the fluid cooled copper block.