Numerical Study of Combustion Characteristics of Low-calorific Value Gas Cyclone Burner

In order to solve the problems of large output, low calorific value, difficult ignition and poor flame stability of low calorific value gas, a low-calorific value gas burner was designed based on the idea of staged combustion. A stable flame with rich combustion was formed in the center of the gas burner, and a swirl combustion flame was generated at the periphery, and a stable combustion flaring was designed at the outlet of the burner to achieve stable combustion of a single burner with low calorific value. The numerical calculation method was used to establish the calculation model of the burner. The effects of preheating temperature on the combustion characteristics and pollutant emission characteristics of low-calorific value gas burners were studied. And the velocity field, temperature field and NO emission during air preheating and low calorific value gas preheating were analyzed. Results show that with the increase of preheating temperature, the maximum reflux velocity increases, and the volume fraction of NO at the furnace outlet increases gradually. The effect of gas preheating with low calorific value on combustion is stronger than that of air preheating.