초록 ▼

In order to permit operation with preheating of the combustion-supporting air to 50 or preferably 65 percent or more of the oven temperature, the air is fed to a ceramic burner tube through an annular nozzle directing it in an annular jet along the interior walls of the burner tube. For a burner of

In order to permit operation with preheating of the combustion-supporting air to 50 or preferably 65 percent or more of the oven temperature, the air is fed to a ceramic burner tube through an annular nozzle directing it in an annular jet along the interior walls of the burner tube. For a burner of low back pressure having no restriction at the mouth of the ceramic burner tube, the ceramic burner tube fits over the end of the outer member of the annular nozzle and some of the combustion product gas, flowing from the oven into the burner structure for countercurrent of the preheating of the air supply, is sucked into the underpressure zone between the annular air jet and the inner wall of the burner tube through a small annular gap where the burner tube fits on the air-supply nozzle. For a burner design involving considerable back pressure, the ceramic burner tube fits within the outer wall of the annular nozzle with a very small clearance in the overlap and some of the supplied air, which is at higher pressure than the exit in gases, escapes through the gap around the outside of the burner tube and cools the burner tube and the adjacent overlapping portion of the air supply tube.

대표청구항 ▼

A burner system for heating oven spaces of industrial ovens of the kind using a ceramic burner tube at the downstream end of the burner system and an air supply tube coaxial with the burner tube connecting therewith to provide a burner port in the region of the connection, where air and fuel are mix

A burner system for heating oven spaces of industrial ovens of the kind using a ceramic burner tube at the downstream end of the burner system and an air supply tube coaxial with the burner tube connecting therewith to provide a burner port in the region of the connection, where air and fuel are mixed for ignition, a fuel supply tube of smaller diameter leading to the burner port region being centered within the air supply tube, the air supply tube being surrounded by a passage through which combustion product gases pass out in counter-current to the air supply and being equipped with means constituting a recuperator for preheating of the air supply by heat removed from the combustion product gases, said air supply tube further having an air-guiding cylinder within it for confining the air supply flow to an annular space for effective operation of said recuperator, said burner system further comprising the improvement which consists in that: an annular nozzle (15) adjacent to the interior wall of said burner tube (5) is connected to said air supply tube (6) at its extremity, for causing air from said annular space (12) of said air supply tube to flow out at increased velocity in an annular jet along the interior wall of said burner tube (5), and means are provided for cooling said air supply tube (6) in the region of its extremity at said burner port (14) by gas, of a temperature lower than that of the flame gases, penetrating between said air supply tube (6) and said burner tube (5).