日本住友金属公司最近开发了新型高效低NO_x烧嘴系列。这些混合式喷嘴烧嘴具有低空气比,完全燃烧,低NO~x,高调节比,过量空气稳定燃烧及可以用热空气等特点。安全可靠,高效节能,由NO~x含量低并可大大减轻环境污染。以SNT型低NO~x烧嘴为例(见图1),它能产生强烈的漩流,根据涡流原理,内部负压和外部正压间的压差产生自循环气流,回流加速了燃料与空气混合,促进燃烧,缩短燃烧时间。回流移向火焰中心,消去局部高温,使火焰温度均匀,并使氧压稍有下降。由于燃料—空气加速混合,在空气比低的情况下也能完全燃烧,并可帮助降低NO~x含量,获得非常稳定的火焰形状。烧嘴结构中有块 Sumitomo Metal Japan has recently developed a new series of high efficiency and low NO_x burner. These hybrid nozzle burners feature low air ratio, complete combustion, low NOx, high turndown ratio, stable combustion with excess air, and hot air. Safe, reliable, energy efficient, low NOx content and can greatly reduce environmental pollution. Taking SNT low NOx burners as an example (see Fig. 1), it produces a strong swirling flow that generates a self-circulated air flow based on the eddy current principle and the pressure difference between the internal negative pressure and the external positive pressure, Air mix, promote combustion, shorten the burning time. Return to the center of the flame back, eliminating the local high temperature, the flame temperature uniformity, and a slight decrease in oxygen pressure. Due to the fuel-air accelerated mixing, it is also completely combusted at low air ratios and helps to reduce NO x content for a very stable flame shape. There are blocks in the burner structure