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

• 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

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.

气体从浸入式旋转喷入熔池。提出了L形喷嘴，以加强熔池搅拌，获得更好的气泡分散行为。通过冷模实验研究了不同喷嘴转速和气体喷射条件对熔池混合的影响。将混合时间的实验结果与以往的气体喷射搅拌实验结果进行了比较。(1)由于喷嘴旋转而产生的周向循环流和由于气体喷射而产生的垂直循环流加强了熔池混合。这两种流动中的哪一种对混合有较大的影响可以通过混合时间对浴深度的依赖性来检查。然而，这两种功率对浴混合的贡献随着实验条件的变化而变化很大，因此在广泛的实验条件下，根据混合功率密度定量估计混合时间是相当困难的。(2)在L/D=0.279（L：L形喷嘴的弯头长度，D：熔池直径）的情况下，各种参数对混合时间t的影响<mix>可由下式给出：t_<mix>Q^<-0.276>R^<-0.245>H^<0.119>D^<1.26>其中Q是气体流速，R是旋转速率，H是熔池深度。(3)当熔池较浅时，机械搅拌比气体喷射搅拌提供更好的熔池混合。但提高浸入式水口转速对强化熔池混合有一定的限制。(4)该工艺可使气泡在镀液中广泛分散，镀液混合效果优于传统的气体喷射搅拌。在高转速、浅熔池条件下，气体的注入增加了熔池的混合时间，对熔池的混合有不利影响。

项目成果

M.Sano et al.: "Mixing Characteristics under Gas Injection by Rotary Lance Submerged in a Liquid Bath" 材料とプロセス. 7(発表予定). (1994)

M.Sano 等人：“浸没在液体浴中的旋转喷枪气体注射的混合特性”材料和工艺 7（待出版）。

Masamichi Sano et al: "Mixing Characteristics under Gas Injection by Rotary Lance Submerged in a Liquid Bath" Current Advances in Materials and Process (CAMP). vol.7 (to be published). (1994)

Masamichi Sano 等人：“浸没在液浴中的旋转喷枪气体注射下的混合特性”当前材料与工艺进展 (CAMP)。

佐野 正道 他: "偏心回転ノズルからのガス吹込みによる浴の撹拌混合" 材料とプロセス. 6. (1993)

Masamichi Sano 等人：“通过从偏心旋转喷嘴喷出气体来搅拌和混合浴液”材料和工艺 6。(1993)。