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通过冷热态试验研究与数值模拟相结合的方法,分析了加入水煤浆雾矩前后对流场的影响以及水煤浆雾矩在冷热态流场中的差别,得出影响烟气回流形成的3个因素及其重要性:高温烟气受热膨胀以及水煤浆颗粒化学反应导致水煤浆雾矩刚性锐减,由中心向壁面扩散是回流形成的主要因素;水煤浆雾矩的高速射流对回流区形状产生重要影响;旋流燃烧器的旋转射流对回流的影响可以忽略不计.
Through the combination of experimental study and numerical simulation, the influence of the flow field before and after adding the CWM to the flow field and the difference between CWM and the CWM flow field are analyzed. The formation of three factors and their importance: high-temperature flue gas expansion and coal-water slurry chemical reaction lead to the rigidity of coal-water slurry rigidity sharp decrease from the center to the wall diffusion is the main factor of the formation of reflux; High-speed jet has a significant impact on the shape of the recirculation zone; the effect of the swirling jet of the swirl burner on backflow is negligible.