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本文通过对弯管内气固两相流动的数值计算,建立了固体颗粒在惯性离心力的作用下,从气流中向弯管外侧壁面分离的规律与斯托克斯准则数和颗粒在弯道内运动角度的关系.对水平肘管内气固两相流动特性进行了实验研究,得出在 R_0/d 分别为2和4、一次风速分别为15m/s 和20m/s、煤粉平均粒径为50～60μm、煤粉浓度为0. 2kg/m~3的工况下,当煤粉-空气混合物流过弯头的角度≥45°时,约有80%以上的煤粉颗粒沿弯管外侧形成一股高煤粉浓度的气流流出.这一结果与数值计算结果较吻合.实验与理论计算结果为开发煤粉浓缩燃烧技术提供了重要的理论依椐.
In this paper, by numerical calculation of gas-solid two-phase flow in elbow, the law of separation of solids from the gas flow to the outer wall of elbow and the number of Stokes criterion and the movement of particles in the curve under the centrifugal force of inertia are established. Angle.The relationship between gas-solid two-phase flow in a horizontal elbow was studied.It was found that when the R_0 / d were 2 and 4 respectively, the primary wind speed was 15m / s and 20m / s, the average particle size of coal was 50 ~ 60μm, pulverized coal concentration of 0. 2kg / m ~ 3 conditions, when the pulverized coal - air mixture through the elbow angle ≥ 45 °, about 80% of the coal particles formed along the outside of the elbow A high pulverized coal flow outflow, which is in good agreement with the numerical results.The experimental and theoretical results provide important theoretical basis for the development of pulverized coal enrichment combustion technology.