Total primary combustion burner

Abstract

A total primary combustion burner which includes a burner body with an air-fuel mixture chamber into which an air-fuel mixture of a fuel gas and primary air is supplied, a combustion plate portion covering an opening surface, which faces the air-fuel mixture chamber, of the burner body, and a backfire suppressing plate portion disposed opposite the combustion plate portion with a gap inside the air-fuel mixture chamber. The air-fuel mixture passing through the backfire suppressing plate portion ejects from the combustion plate portion and undergoes combustion. The total primary combustion burner is configured so that backfire can be suppressed as much as possible while suppressing pressure loss, even when using hydrogen as the fuel gas. The backfire suppressing plate portion has a sintered sheet obtained by sintering a laminate made by sintering an aggregate of metallic fibers or beads.

1 . A total primary combustion burner, comprising,
 a burner body with an air-fuel mixture chamber into which an air-fuel mixture of a fuel gas and primary air is supplied; and   a combustion plate portion covering an opening surface, which faces the air-fuel mixture chamber, of the burner body,   wherein a backfire suppressing plate portion is disposed opposite the combustion plate portion with a gap inside the air-fuel mixture chamber,   wherein the air-fuel mixture passing through the backfire suppressing plate portion is configured to eject from the combustion plate portion and undergoes combustion, and wherein hydrogen gas is utilized as the fuel gas, and   wherein the backfire suppressing plate portion has a sintered sheet formed by sintering an aggregate of metallic fibers or beads.   
     
     
         2 . The total primary combustion burner as claimed in  claim 1 , wherein the metallic fibers or beads are composed of Fe (iron) and at least one element selected from the group consisting of Al (aluminum), Cr (chromium), Mn (manganese), and Si (silicon), or a carbide(s) thereof. 
     
     
         3 . The total primary combustion burner as claimed in  claim 2 , wherein weight per unit area during sintering the sintered sheet is set within a range of 1,200 g/m2 to 1,800 g/m2. 
     
     
         4 . The total primary combustion burner as claimed in  claim 1 , wherein a temperature sensor is disposed at a portion of the air-fuel mixture chamber, which is positioned between the combustion plate portion and the back fire suppressing plate portion. 
     
     
         5 . The total primary combustion burner as claimed in  claim 1 , wherein the gap between the combustion plate portion and the backfire suppressing plate portion is set within a range of 5 mm to 30 mm. 
     
     
         6 . The total primary combustion burner as claimed in  claim 1 , wherein the combustion plate portion has a sintered sheet formed by sintering an aggregate of metallic fibers or beads. 
     
     
         7 . The total primary combustion burner as claimed in  claim 4 , wherein the gap between the combustion plate portion and the backfire suppressing plate portion is set within a range of 5 mm to 30 mm.