Oxygen-enriched burner and method for heating using oxygen-enriched burner

Abstract

An object of the present invention is to provide an oxygen-enriched burner which can change any oscillation period and uniformly heat an object to be heated with an excellent heat transfer efficiency when heating the object to be heated while moving the flame with self-induced oscillation, and a method for heating using an oxygen enriched burner, and the present invention provides an oxygen-enriched burner including a center fluid ejection outlet and a peripheral fluid ejection outlet provided around the center fluid ejection outlet, a pair of openings are provided at opposite positions on side walls of a fluid ejection flow path of the center fluid ejection outlet, a pair of the openings are communicated with each other by a communication portion, an interval between a pair of side walls downstream of the openings in the fluid ejection flow path is gradually expanded toward the downstream side, and the communication portion includes a first communication pipe and the second communication pipe each having a first end connected to a pair of the openings, and at least one communication element connected to second ends of the first communication pipe and the second communication pipe and communicating the first communication pipe and the second communication pipe.

1 . An oxygen-enriched burner which is configured to eject an oxygen-enriched air or a fuel gas from a plurality of fluid ejection outlets provided at the tip surface and burns them,
 wherein a plurality of the fluid ejection outlets include a center fluid ejection outlet and a peripheral fluid ejection outlet,   a pair of openings are provided at opposite positions on side walls of a fluid ejection flow path of the center fluid ejection outlet,   a pair of the openings are communicated with a communication portion,   an interval between a pair of the side walls downstream of the opening in the fluid ejection flow path is gradually expanded toward the downstream side,   the peripheral fluid ejection outlet is provided around the center fluid ejection outlet,   the communication portion includes a first communication pipe and a second communication pipe each having a first end connected to a pair of the openings, and at least one communication element connected to a second end of the first communication pipe and the second communication pipe and communicating the first communication pipe and the second communication pipe.   
     
     
         2 . The oxygen-enriched burner according to  claim 1 , wherein a plurality of the communication elements are provided in parallel between the first communication pipe and the second communication pipe. 
     
     
         3 . The oxygen-enriched burner according to  claim 2 , wherein at least one of an inner diameter and a length of a plurality of the communication elements is different. 
     
     
         4 . The oxygen-enriched burner according to  claim 1 , wherein the first communication pipe, the second communication pipe, and the communication element are detachably connected. 
     
     
         5 . The oxygen-enriched burner according to  claim 1 , wherein the communication portion includes an on-off valve provided between the first communication pipe and the communication element and between the second communication pipe and the communication element. 
     
     
         6 . A method for heating using an oxygen-enriched burner, wherein an object to be heated is heated using the oxygen-enriched burner according to  claim 1  while causing the fluid ejected from the center fluid ejection outlet to the self-induced oscillation in an expansion direction of the fluid ejection flow path, 
     
     
         7 . The method for heating using an oxygen-enriched burner according to  claim 6 , wherein a period of the self-induced oscillation of the fluid ejected from the center fluid ejection outlet is 30 seconds or less.