MATHEMATICAL AND PHYSICAL MODEL OF THE MIXERS OF AIR/FUEL AND OXYGEN ENRICHED AIR/FUEL BURNER

摘要

The effect of mixing of natural gas with air and oxygen enriched air as the oxidising agents is described in this paper. The theoretical basics of the oxy/fuel combustion and the effect of increasing of oxygen content in the oxidising agent on the flue gas composition and theoretical temperature at natural gas combustion are briefly described. The burner of 2 kW thermal power with two types of mixing devices was designed. The mixing devices were tested using the mathematical model formulated on the basis of CFD-software and monitoring the flame temperatures on the physical models. In order to achieve a better comparison of the mixing devices, only their geometry were being modified, while the input parameters such as the mass flow of natural gas and oxidants remained the same. Using CFD modelling the different mixing chambers was also designed, of which the best results were achieved at the mixers with truncated cone shape. However, it has not been confirmed experimentally on the test apparatus.