摘要
针对评价顶吹宏观混匀时间的方法进行了气体顶吹搅拌水动力学实验研究,利用基于混合过程中示踪粒子的分布随时间演化规律的RGB颜色模型来确定搅拌容器内的宏观混匀时间。通过定义像素阈值分离每一像素,构建混匀像素比M值作为确定混匀时间的指标,观察M值的变化规律,利用3σ方法确定混匀时间。针对喷枪插入深度及流量,用量纲为1强度单位表述为0.5和1的实验工况一,当阈值分数X=90%时,测定混匀时间为13.30s。分析结果发现,RGB颜色模型能够基于混合过程中示踪粒子的分布情况确定混匀时间,且与贝蒂数法和电导率法测定的混匀时间偏差不超过10%。为解决在视觉上评价多相流混合效果等工程问题提供了一种新的思路,为提高ISA炉使用寿命、强化ISA炉冶炼生产以及优化ISA炉工艺过程提供了一定的实验依据。
To evaluate the top-blown macromixing time method,hydrodynamic experimental study of top-blown gas stirring was carried out. The RGB color model was used to determine the macromixing time in stirred vessels based on the law of distribution of tracer particles with time evolution. By defining the threshold to separate each pixel,we established the mixed pixel ratio M（%） value as the index to determine the mixing time and observed the change law of M（%） value to determine the mixing time by the method of 3σ. The mixing time is 13.30 seconds when X（the threshold） equals 90% under the first experimental condition of the spray gun＇s insertion depth 0.5 and the flow rate 1 expressed by nondimensional strength unit. The analysis results showed that the RGB color model can be used to determine the mixing time based on the distribution of tracer particles in the mixing process.The deviation of the mixing time was not more than 10% measured by Betti numbers and electrical conductivity. A new insight was provided to solve the engineering problem such as various multiphase mixed effect and some experimental basis are offered to improve the life span of ISA furnace,strengthen its smelting production and optimize its technological process.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2016年第9期2728-2734,共7页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(51406071
51666006
61305057)
云南省基金面上项目(2013FB020)
金川公司校企预研项目(61910070034)
校人才培养项目(KKSY201452090)
