With the demand of energy saving and consumption reduction growing, low calorific value (LCV) fuel gas was injected by the coherent supersonic jet not only satisfied the requirements of smelting but also reduced the CH4 consumption. In this paper, numerical simulations and combustion experiments were carried out to investigate the effect of the fuel gas composition on the jet behaviors of coherent jet. The length of the region where the jet velocity is more than 400m/s with “80% CH4 + 20% N2” could achieve 95.2 pct of that with “100% CH4”, meanwhile 20 pct CH4 consumption can be saved, which is a high cost-effective solution. Based on the industrial application research, the coherent supersonic jet with “80% CH4 + 20% N2” could reduce the FeO content in end-point slag, the oxygen and natural gas consumption.
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