多通道烧嘴水煤浆气化过程数值模拟

针对气化炉烧嘴在使用过程中出现的雾化效果差的问题,采用了DPM颗粒离散多相流模型,研究了同心三通道烧嘴使用过程中的水煤浆管内流动和雾化规律。改变多个影响因素并正交分析后得出:水煤浆雾化受烧嘴内外两气道气体流速变化的影响,气体流速增大时,水煤浆SMD值降低;当增加水煤浆流道锥角,使水煤浆与气体射流充分预混时,SMD值减小明显。此外,增加烧嘴出口节流同样会减小SMD值。综合比较各因素的影响,发现节流尺寸和内喷嘴气体流速对水煤浆的雾化效果影响最大。

Numerical Simulation of Coal Water slurry Gasification process with Multi-channel Burner

Aiming at the problem of poor atomization effect during the use of gasifier burner, this paper uses DPM particle discrete multiphase flow model to study the flow and atomization law of coal slurry tube during the use of concentric three-channel burner. After changing a number of influencing factors and orthogonal analysis, it is concluded that the atomization of coal water slurry is affected by the change of gas flow rate inside and outside the burner. When the gas flow rate increases, the SMD value of coal water slurry decreases; when the coal water slurry flow is increased When the cone angle is sufficient to premix the coal water slurry with the gas jet, the SMD value is significantly reduced; in addition, increasing the burner outlet throttling also reduces the SMD value. Comprehensively comparing the effects of various factors, it is found that the throttling size and the internal nozzle gas flow rate have the greatest influence on the atomization effect of coal water slurry.