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为了解决矿热炉水冷型烟道内颗粒沉积造成的烟道输运效率下降等问题，利用计算流体力学(CFD)方法对水冷型烟道内颗粒沉积行为进行模拟.将JKR(Johnson-Kendall-Roberts)理论与Grant-Tabakoff颗粒壁反弹模型相结合，对颗粒与壁面的碰撞行为、颗粒的受力情况和运动轨迹进行预测；同时，以临界捕捉速度作为颗粒沉积的判断准则，研究了烟气流速和三通段拐角对颗粒沉积速率的影响.结果表明：水冷型烟道颗粒的沉积主要集中在入口段、Ⅰ段至Ⅲ段烟道间外拐角和三通段；当烟气流速从3 m/s增至11 m/s时，烟道内颗粒沉积区范围缩小，颗粒的总沉积速率由1.12 g/s降至0.76 g/s,烟气的最佳流速为7 m/s;当三通段夹角由60°增至100°时，颗粒总沉积速率由2.59 g/s降至2.12 g/s,当三通段夹角增至90°时，颗粒总沉积速率不再明显减小，烟道最佳拐角为90°.
Abstract：To solve the problem of low flue transport efficiency caused by particle fouling in the water-cooled flue, computational fluid dynamics(CFD) is used to numerically simulate the particle deposition characteristics in the water-cooled flue. The JKR(Johnson-Kendall-Roberts) theory is combined with the Grant-Tabakoff particle-wall rebound model to predict the particle-wall collision behaviour, the force on the particle, and the particle trajectory. Meanwhile, using the critical capture velocity as the judgment criterion for particle deposition, the effects of flue gas velocity and T-junction section inflection angle on particle deposition rate are investigated. The results show that the particledeposition in water-cooled flue mainly occurs at the entrancesection, the outside corners among the flue from section Ⅰ to section Ⅲ, and the T-junction section. When the flue gas velocity increases from 3 m/s to 11 m/s, the particle deposition zone in the flue shrinks, and the total deposition rate of the particle decreases from 1.12 g/s to 0.76 g/s, with an optimum flow velocity of flue gas is 7 m/s. When theinflection angle of the T-junctionincreases from 60° to 100°, the particle total deposition rate decreases from 2.59 g/s to 2.12 g/s.When the inflection angle of the T-junction is increased to 90°, theparticletotal deposition rate is no longer significantly decreased. Thus, the optimum inflection angle of the T-junction section is 90°.
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基本信息:
DOI：10.14186/j.cnki.1671-6620.2025.06.002
中图分类号:TF644
引用信息:
[1]龚可新,刘鹏,张先珍,等.矿热炉水冷型烟道中颗粒沉积特性数值模拟[J].材料与冶金学报,2025,24(06):581-588.DOI:10.14186/j.cnki.1671-6620.2025.06.002.
基金信息:
辽宁省教育厅面上基金(LJKMZ20220775)