铜闪速吹炼炉烟道内气粒两相流动过程的数值模拟

Numerical Simulation of Flue Gas Particle Two-phase Flow in Copper Flash Converting Furnace

为深入研究闪速吹炼炉上升烟道中烟气与烟尘运动特点,分析烟道内局部耐火材料损耗严重的问题,以闪速吹炼炉上升烟道为对象,开展了烟道内气粒两相流动过程的仿真计算,分析了上升烟道中烟气与烟尘的运动特点,并对上升烟道与余热锅炉连接处黏结快速形成的主要原因进行探究。研究表明,闪速炉烟道内烟尘颗粒尺寸较小,其运动轨迹主要受烟气流动过程带动,且在烟道底部以及烟道与锅炉连接处速度较大,易对炉体耐火材料产生磨损;另外,在烟道与锅炉连接处,由于该位置处烟气和烟尘温度仍相对较高,因此进入锅炉后受烟气速度减小和回流的影响,熔融态颗粒易停滞黏结;同时,由于上升烟道内气流的影响,易导致烧嘴出口处气流偏移,出现烟道与锅炉连接处东侧不易结块,而西侧容易结块的现象。

In order to study the characteristics of flue gas and smoke movement and analyze the serious erosion of refractory material in uptake shaft of copper flash converting furnace,taking the uptake shaft of the copper flash converting furnace as object,the simulation calculation of flue gas and particles two-phase flow in uptake shaft of copper flash furnace was carried out to analyze the movement characteristics of flue gas and dust in uptake shaft.The main reasons for rapid formation of accretion at the connection of uptake shaft and waste heat boiler were explored.The results show that the movement trajectory of dust particles is mainly driven by the flue gas,due to their small sizes.Meanwhile,the velocities of flue and dust are large at the bottom of uptake shaft and the connection of shaft and boiler,which is easy to cause the erosion of refractory material.Furthermore,at the connection of shaft and boiler,as the temperatures of flue gas and dust are still relatively high,the molten particles are assumed easier to stagnate and accrete due to the velocity reduction and back-flow of flue gas.Due to the influence of flue gas flow in the uptake shaft which lead to the offset of flame of nozzle,the accretion at the west side of connection is easy to format,while the east side is not.