Radiant heating tube for gas fired furnace - has concentric perforated air tube between gas and flue tubes projecting into furnace

摘要

The radiant heating pipe is for use in gas heating systems. The tube end in the furnace is closed, and gas and air are supplied to the tube at the open end. The flue gas pipe is in the centre and the air tube is arranged concentrically to it. The combustion air enters fuel gas stream through perforations in the tube wall. The outside tube (1) encloses the air tube (2) which in turn encloses the flue gas tube (3). The air tube has in the burning length, several small perforations. The number of these perforations is so high and their diameter is so small that the air flowing out through them will not reach the inner wall of outside tube.