Roller for oven grid, has fuel support surface formed by duct permitting passage of cooling fluid and forming helical winding around axis, where surface has fuel passage unit for passage of fuel through roller

摘要

The roller has a frame forming a cylindrical case. A fuel support surface is mounted around the frame, where the surface is provided with fuel passage unit for passage of fuel through the roller. The surface is formed by a duct (3) permitting passage of a cooling fluid and forming a helical winding (4) around an axis (A). Hollow elements are formed of channels provided with an opening directed towards exterior of the roller and a covering plate made of refractory steel.