The application of high purity oxygen enriched gas auxiliary combustion technology by PSA / VPSA oxygen plant can not only improve the temperature and blackness of the flame, but also enhance the radiation and heat transfer ability of the flame to the materials. At the same time, due to the reduction of the amount of nitrogen in the air, the combustion degree is improved, so the combustion efficiency of the fuel is improved, energy is saved, consumption is reduced, and environmental pollution is also reduced.