偏心回転ノズルによる精錬反応装置の撹拌強化に関する研究

偏心旋转喷嘴强化搅拌精炼反应器的研究

基本信息

批准号：
04650614
负责人：
SANO Masamichi
金额：
$ 1.34万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650614/
关键词：
REFINING REACTOR BATH MIXING MIXING TIME ECCENTRICALLY ROTATING NOZZLE MECHANICAL STIRRING GAS INJECTION STIRRING STIRRING POWER DENSITY CIRCULATING FLOW 攪拌混合機械攪拌ガス吹込み攪拌攪拌動力密度均一混合時間水モデル気泡分散ガス吸収

项目摘要

Gas injection into a bath from an immersed rotating. L-shaped nozzle has been proposed for intensifying the bath stirring and for obtaining better bubble dispersion behavior. Cold model experiments under various nozzle rotating rates and gas injection conditions were made to investigate their effects on the bath mixing. The experimental results of mixing time are compared with previous ones obtained gas injection stirring.The present results are summarized as follows.(1) The bath mixing is intensified by the circumferential circulating flow due to the nozzle rotation and by the vertical circulating flow due to the gas injection. Which of the two flows has a larger effect on the mixing can be examined by the dependence of mixing time on the bath depth. However, the contributions of the two powers to the bath mixing changes largely with the experimental conditions, so that quantitative estimation of the mixing time on the basis of mixing power density under widely ranged experimental conditions is quite difficult.(2) In the case of L/D=0.279 (L : elbow length of the L-shaped nozzle, and D : bath diameter), the effects of various parameters on the mixing time, t_<mix>, can be given by the following equation.t_<mix> Q^<-0.276>R^<-0.245>H^<0.119>D^<1.26>where Q is the gas flow rate, R is the rotating rate, and H is the bath depth.(3) When the bath is shallow, the mechanical stirring gives better bath mixing than the gas injection stirring. But there is a limitation to the intensification of bath mixing by increasing rotating rate of the immersed nozzle.(4) The present process can disperse bubbles widely in the bath, and the bath mixing is better than that by the conventional gas injection stirring. In the case of high rotating rate and shallow bath, the gas injection increases the mixing time, and hence gives a bad influence on the bath mixing.

从沉浸式旋转中注入气体。已经提出了L形喷嘴，以加强浴缸搅拌并获得更好的气泡分散行为。在各种喷嘴旋转速率和气体注入条件下进行冷模型实验以研究其对浴室混合的影响。将混合时间的实验结果与先前获得的气体注入搅拌进行了比较。（1）由于喷嘴旋转而引起的圆周循环流以及由于注入气体的垂直循环流而加强了浴缸混合。这两个流中的哪一个对混合具有更大的影响，可以通过混合时间对浴缸深度的依赖性进行检查。但是，两种能力对沐浴混合的贡献在很大程度上随着实验条件而发生了很大的变化，因此，基于在广泛范围的实验条件下混合功率密度对混合时间进行定量估计非常困难。（2）在L/d = 0.279的情况下（在L形notake notzle bath and bath bath bath diateme time time time time time time time the time the Ryse the Remime the Remime the Remime the Ryse the Remime the Acrip的效果上，该效果，<由以下方程式给出。但是，通过增加浸入喷嘴的旋转速率来增加浴室混合的限制。（4）目前的过程可以在浴室中广泛分散气泡，并且通过传统的气体注入搅拌，浴缸混合量优于浴缸混合。在高旋转速率和浅浴的情况下，气体注入会增加混合时间，因此对浴室混合产生了不良影响。