| 摘要 |
PCT No. PCT/JP95/01418 Sec. 371 Date Jan. 15, 1997 Sec. 102(e) Date Jan. 15, 1997 PCT Filed Jul. 17, 1995 PCT Pub. No. WO96/02793 PCT Pub. Date Feb. 1, 1996In combustion using air preheated by regenerative direct heat exchange between exhaust gas and the combustion air using a regenerator as a heat exchange medium, the present invention relates to a low-NOx burner that is effective for reduction in NOx in a mid-temperature range which has been conventionally difficult to be realized and improves stability of the flame. According to this low-NOx burner, at an outlet of an air throat 24 for flowing a full quantity of the combustion air is disposed a burner tile 22 having an enlarged diameter portion 23 thereof whose diameter is larger than that of the outlet, and a fuel nozzle 19 for injecting the fuel from the enlarged diameter portion 23 of the burner tile is also provided. Further, a flow of the combustion air injected from the air throat 24 produces a negative pressure at a secondary combustion chamber 25 surrounded by the enlarged diameter portion 23 of the burner tile around the air throat 24 to cause a strong furnace exhaust gas recycle to occur, and a flame holding area X1, a furnace exhaust gas recycle combustion area X2 and a slow combustion area X3 are formed.
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