In the process of metal smelting, PSA / VPSA oxygen generation system is used to improve the purity of oxygen, change the oxygen content of the air pumped into the feed layer, improve the combustion conditions of fuel and enhance the oxidation atmosphere in the combustion zone. Oxygen enriched sintering can increase the amount of liquid phase production, prolong the holding time, increase the sinter yield and drum index, and fully burn the solid fuel in the sinter layer, so as to reduce the fuel consumption and CO2 emission, and meet the requirements of sintering environmental protection in China. It is gradually used in many steel plants.