Numerical Simulation Of High Velocity Gas Burner

Along with the attention of environmental protection, and the implementation of"transfer natural gas from the west to the east"project, the natural gas market of our country has gotten further development, move towards the prosperity rapidly. Since gas-industry goes through coal gas,LPG and natural gas, there are a lot of burners that use cool gas or LPG at present. For adapting well to the developmental direction of the world gas-fuel industry, we must solve the important problem which is that to gather head the applicability to multiplicate gas of the actual burners.In the article a sort of burners is choosed to study the applicability to multiplicate gas and the burner is optimized to fit natural gas and LPG better. Physical model of the burner is established and mathematical model of the combustion progress is introduced in detail. Three-dimensional model for numerical simulation process in combustor is created by CFD software. Standard k ?εturbulent model, PDF non-premixed combustion model, P-1 radiation model, thermal NOx formation model are considered in the physical model. The differences of combustion process between LPG burner and natural gas burner are compared. The temperature, velocity and the mass fraction of NOx are studied by changing diameter of fuel-inlet, and the best diameter is fined. Additionally, the LPG burner with the best diameter is simulated. In the end, the effect to the temperature, velocity and the mass fraction of NOx by changing the coefficientαis analyzed. Some conclusions are drawn in the article: if the burner which uses natural gas has the same power with the burner uses LPG, the velocity of natural gas must be higher. When the natural gas burner works with the load which is varied within specified limits, there is a best diameter for fuel inlet, and the mass fraction of NOx is lower in this condition. The best diameter also applies to the LPG burners. The coefficientαhas a great influence on the temperature,velocity and the mass fraction of NOx distribution. The uniform temperature distribution and low mass fraction of NOx are acquired whenα=1.1.