Abstract
The whole oxygen MILD combustion technology mainly relies on the flue gas coiling and reflow effect of MILD combustion technology, so that the whole oxygen combustion can achieve MILD effect. Flue gas coiling backflow is the embodiment of gas eddy motion. There are a lot of eddy structures in coiling mixing process, so the effect of all-oxygen MILD combustion is determined by eddy structure. In this paper, numerical simulation and experimental methods are combined to analyze the vortex structure in heating furnace with the help of Liutex method, and the threshold value 3 of vortex core is selected to draw the vortex core and vortex line. The results show that the vortex structure can directly reflect the vortex motion of gas in the furnace, and the vortex motion in the furnace is mainly concentrated in the initial section of the furnace. The size and quantity of the vortex structure in this area is stronger than that in the middle and rear of the furnace, and it is also the main combustion region of the furnace. Under certain threshold conditions, too much or too little vortex core structure in furnace will affect combustion efficiency. The combination of vortex line and streamline line can better reflect the backflow and mixing of gas in the furnace, and is more conducive to the analysis of vortex motion of gas in the furnace.
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