| 摘要 |
PURPOSE:To reduce production of NOX and to enable increasing of a throttle ratio because of a burner body being a Bunsen type, by a method wherein main burner ports are decreased in heat capacity of a wire net and the like, burner bodies each having a burner port load of 1kcal/hrmm.<2> or less are located in juxtaposition with each other, the one burner body is of a Bunsen 2-stage system, and the other burner body is of a total primary system. CONSTITUTION:Main burner ports 5 and 5' are decreased in heat capacity of a wire net and the like, and burner port, having a burner port load of 1kcal/hrmm.<2> or less, has burner bodies 6, 6', combustion chambers 7, 7', and secondary burner ports 8, 8'. The burner bodies 6 and 6' are located in juxtaposition with each other, and the burner body 6 is a Bunsen system having a primary air ratio of 100% or less and of a Bunsen 2-stage combustion system in which a primary flame and a secondary flame are formed at the main burner port 5 and a secondary burner port 8, respectively. Meanwhile, the burner body 6' is a total primary system burner having a primary air ratio of 100% or more, and of a system in which complete combustion is effected in the main burner 5'. In this constitution, 70% throttle is effected by the total primary system burner body, and 1/3-1/4 throttle is effected by the Bunsen system burner body, and this reduces a value of NOX to 10ppm or less and allows throttle of 1/5 or more.
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