引射排风对铜转炉环集系统控制效果影响的分析及优化
Analysis and optimization of induced exhaust air flow control effect in copper converter fugitive gas collection systems
摘要：
铜转炉环集系统存在高温烟尘逃逸问题,工程上常采用屋顶罩进行再次捕集。为了探究在转炉环保烟罩上方加装引射流装置,将高温烟尘输送到屋顶罩的思路的可行性,本文采用现场测试和CFD数值模拟的方法,分别研究了有无引射流作用下屋顶罩排风系统对厂房上部热环境的影响,并进一步分析了其对高温气载污染物(SO2气体、烟尘颗粒)捕集效率的影响。研究发现:增设引射流装置后,厂房内热环境得到明显改善,厂房上方空间平均温度从64.5 ℃降至48.1 ℃;引射流结合屋顶罩的局部排风系统显著提升了SO2气体、烟尘颗粒的捕集效率,分别由原来的67.4%和72.1%提升至91.1%和94.7%。根据数值模拟的高温烟尘控制效果,给出了高温轴流风机建议选型及参数范围。
Abstract：
The exhaust system of copper converters has the problem of high-temperature smoke escape, and the roof hood is often used for recapturing in the project. In order to explore the feasibility of installing a induction jet device above the converter eco-friendly hood system to transport high-temperature smoke to the roof hood, this paper uses field test and CFD numerical simulation to study the influence of the roof hood exhaust system on the upper thermal environment of the plant with or without induction jet, and further analyses its influence on the capture efficiency of high-temperature airborne pollutants (SO2gas and particles). The results show that the thermal environment in the plant is significantly improved after the addition of the induction device, and the average temperature in the upper space in the plant decreases from 64.5 ℃ to 48.1 ℃. The local exhaust system combined with the roof hood significantly improves the capture efficiency of SO2gas and particles, from 67.4% and 72.1% to 91.1% and 94.7%, respectively. According to the numerical simulation of the high-temperature smoke control effect, the recommended selection and parameter range of high-temperature axial fans are given.
Keywords:copper converter; high-temperature pollutant; roof hood; induction jet; capture efficiency; temperature distribution