矿热炉烟道气固两相传质机理及冲蚀特性

Numerical simulation of gas⁃solid two⁃phase mass transfer mechanism and solid particle erosion wear characteristics in the electric furnace flue

通过建立三维多尺度的气固两相传质模型,预测了矿热炉烟道内气固两相流作用下湍流涡的发展及分布规律,揭示了气固两相的传质机理.采用DPM模型结合Grant和Tabakoff颗粒壁反弹模型及DNV冲蚀模型,分析了矿料颗粒的运动轨迹及其对烟道壁的冲蚀行为,研究了烟道出口段的弯转角和颗粒粒径对颗粒冲蚀磨损行为的影响规律.结果表明:烟道弯转角对炉气流动和烟道壁冲蚀磨损的影响较大,随着弯转角的增大会使炉气流动逐渐平稳,颗粒造成的最大冲蚀区域消失,最大冲蚀速率大幅降低;当颗粒粒径为80~260μm时,粒径的增大可导致冲蚀区域范围缩小,冲蚀速率增大;当粒径为260~340μm时,冲蚀速率迅速降低,最终为0.

A three⁃dimensional multi⁃scale gas⁃solid two⁃phase mass transfer model was established to predict the development and distribution of turbulent vortex under the action of gas⁃solid two⁃phase flow in the flue,and reveal the mass transfer mechanism of gas⁃solid two-phase.The DPM model,combined with the Grant and Tabakoff particle⁃wall rebound model and the DNV erosion model,was used to analysis the particle trajectories and its erosion behavior on the flue wall.Meanwhile,the influence of the turning angle of flue outlet section and particle diameter on the erosion behavior of the flue were researched.The results show that the flue turning angle has a great influence on the flue gas flow and the erosion wear of flue wall.The increase of the angle makes the flue gas flow gradually stable,and the maximum erosion zone caused by particle will disappears.Meanwhile,the maximum erosion rate will decrease significantly.Furthermore,the increase of particle diameter,in the range of 80~260μm,will lead to decreasing the erosion area and increasing the erosion rate.However,when the particle diameter is in the range of 260~340μm,the erosion rate will decrease to 0 rapidly.