Simulation and experiment research on the relationship between primary air ratio and burner head temperature of partially premixed combustion burning natural gas

There are rarely studies on the influence of gas burner head temperature caused by gas components change or combustion process variation with primary air ratio. In this paper, it simulated the relationship between primary air ratio and gas burner head temperature of partially premixed combustion by using ICEM CFD, and compared with the experiment results, it confirmed the temperature correction coefficient to calculate the specify value of primary air ratio when gas was substituted. The simulation results conform to the characteristic of primary air ratio decreasing with Wobbe Index increasing, the deviation of simulation value and experiment value is within ±0.02. When gas was interchanged, the primary air ratio of partially premixed combustion is not only inversed with Wobbe Index, but also affected by gas burner head temperature. From the experiment results, when rich gas is substituted by poor gas, the suggestion temperature correction coefficient k is 1.1; and when poor gas is substituted by rich gas, the suggestion temperature correction coefficient k is 0.9; but when the properties of interchange gases are similar, it is not necessary to make temperature correction.