Forced hot air oven combustion top

摘要

A forced air hot combustion top (10) comprising: a heat recovery chamber (4) including a pipe airstream for supplying hot air forced; and a combustion chamber (3) which includes a pipe of forced hot air (5) and a burner system (1, 2) for delivering forced hot air oven air stream and which is placed above chamber heat recovery (4), wherein the chamber heat recovery (4) is heated by the combustion of mixed gas including the fuel and air combustion gas supplied from the burner system (1, 2 ) to the combustion chamber (3) and hot air stream which is generated while the forced hot air passing through the chamber heat recovery (4) is supplied to the oven air flow through the pipe of hot air stream (5) in which the burner system (1, 2) includes a burner (1) provided with a fuel line gas (1c) and an air pipe combustion (1b, 1d); and a duct burner (2) communicating with an outlet of the burner (1a) of the burner (1), the burner conduit (2) communicating with the combustion chamber (3) through the outlet duct burner ( 2b), wherein the burner conduit (2) has an inner diameter D1 halfway duct burner (2) and includes an enlarged opening portion (2c) in which an inner diameter of the burner ( 2) is enlarged to have an inner diameter D2 provided on a section from the middle of the burner conduit (2) to the outlet duct burner (2b), so that an eddy current (ED) of the mixed gas it flows into the combustion chamber (3) through the burner conduit (2) is formed in the enlarged portion of the opening (2c), characterized in that - a length (L) of the enlarged portion of the opening (2c) to the outlet duct of the burner (2) it is in a range from 0,3D1 to 1,4D1 in dond and D1 represents the inner diameter of the burner (2) halfway, - the eddy current (ED) aims at a high temperature atmosphere from the combustion chamber (3) and forms a support portion of the flame for stabilizing an ignition point, and that - the duct burner (2) includes a position of the burner outlet (1a), a tapered portion of the opening (2d) in which the inner diameter of the burner ( 2) is reduced and the mixed gas including the fuel gas and combustion air is formed in the tapered portion of the opening (2d).