A COMPARATIVE ANALYSIS OF DIFFERENT SPECIAL INJECTOR BURNER DESIGNS BY USING CFD.

Hot air from the cooling zone of a continuous kiln is available at the end of the corresponding firing zone. It can be used again with the application of special injectors. 3D simulations in a domain containing injector nozzles are carried out to evaluate the temperature distribution inside the continuous kiln in case of using the hot air which comes from the cooling zone. The roller hearth kiln is taken as a computational domain in this study. Parameters referring to the direction of the burner streamline, the quantity of the air sucked and the effect of the cone length are studied. The temperature distribution at the outlet is determined in case of fixing the burner against or along the direction of the main flow. It is shown that the maximum air velocity at the outlet of the burner cone is about 90m/s. The upstream model temperature distribution is found better than the downstream one. It is also suggested that a burner with longer outlet duct can protect the product from direct exposure to the flame. [ABSTRACT FROM AUTHOR]