化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2015年
6期
1569-1575,1581
,共8页
王朝阳%杨强%许萧%汪华林
王朝暘%楊彊%許蕭%汪華林
왕조양%양강%허소%왕화림
旋流器%柱径比%计算流体力学(CFD)%脱气性能%进口流速
鏇流器%柱徑比%計算流體力學(CFD)%脫氣性能%進口流速
선류기%주경비%계산류체역학(CFD)%탈기성능%진구류속
hydrocyclone%column-diameter ratio%computational fluid dynamics(CFD)%degassing performance%inlet velocity
液体脱气是工业生产环节不可缺少的部分。脱气式旋流器能够在线、快速地进行脱气工作，但目前发展处于初期阶段，对于其脱气性能影响因素的探究还不全面。本文采用计算流体动力学（CFD）的方法，运用流体力学软件Fluent，在H2O-CO2的两相体系、湍流模型采用Reynolds应力模型、多相流模型采用Mixture混合模型的条件下，对不同柱径比的液体脱气式旋流器进行数值模拟，利用旋流离心场的离心力和压力梯度对微小气泡进行分离，获得了对5～50μm不同直径气泡的分离性能以及进口流速对气泡分离性能的影响关系。研究发现，在一定条件下，随着柱径比值的增大，脱气效率总体上先逐渐增大，超过一个极限值后迅速减小，但柱径比越大，越有利于小气泡颗粒的迁移分离；分离效率随着进口流速增加而增加，到达极限之后效率降低。
液體脫氣是工業生產環節不可缺少的部分。脫氣式鏇流器能夠在線、快速地進行脫氣工作，但目前髮展處于初期階段，對于其脫氣性能影響因素的探究還不全麵。本文採用計算流體動力學（CFD）的方法，運用流體力學軟件Fluent，在H2O-CO2的兩相體繫、湍流模型採用Reynolds應力模型、多相流模型採用Mixture混閤模型的條件下，對不同柱徑比的液體脫氣式鏇流器進行數值模擬，利用鏇流離心場的離心力和壓力梯度對微小氣泡進行分離，穫得瞭對5～50μm不同直徑氣泡的分離性能以及進口流速對氣泡分離性能的影響關繫。研究髮現，在一定條件下，隨著柱徑比值的增大，脫氣效率總體上先逐漸增大，超過一箇極限值後迅速減小，但柱徑比越大，越有利于小氣泡顆粒的遷移分離；分離效率隨著進口流速增加而增加，到達極限之後效率降低。
액체탈기시공업생산배절불가결소적부분。탈기식선류기능구재선、쾌속지진행탈기공작，단목전발전처우초기계단，대우기탈기성능영향인소적탐구환불전면。본문채용계산류체동역학（CFD）적방법，운용류체역학연건Fluent，재H2O-CO2적량상체계、단류모형채용Reynolds응력모형、다상류모형채용Mixture혼합모형적조건하，대불동주경비적액체탈기식선류기진행수치모의，이용선류리심장적리심력화압력제도대미소기포진행분리，획득료대5～50μm불동직경기포적분리성능이급진구류속대기포분리성능적영향관계。연구발현，재일정조건하，수착주경비치적증대，탈기효솔총체상선축점증대，초과일개겁한치후신속감소，단주경비월대，월유리우소기포과립적천이분리；분리효솔수착진구류속증가이증가，도체겁한지후효솔강저。
The degassing technology is a necessary part of industrial production. Degassing hydrocyclone can carry on degassing online and quickly. But development of this technology is at an early stage. All-round researches on the factors of performance are lacking. Column-diameter ratio has significant influence on separation performance of degassing hydrocyclone. In this work , the hydrocyclones with different column-diameter ratios were simulated with computational fluid dynamics. A biphasic system consisting of CO2 and H2O was used to evaluate separation performance. Calculation was made with the Fluent software,based on the Reynolds stress model and the Mixture model. The influence of bubble size and inlet velocity was also studied. Under the typical operational conditions,overall degassing efficiency was greatly enhanced with the increase of column-diameter ratio. However,efficiency dramatically decreased when column-diameter ratio exceeded a specific limit. This phenomenon could be explained from the aspect of bubble transfer. Transfer and separation of bubbles with small size were greatly enhanced in hydrocyclones with larger column-diameter ratio. With increasing inlet velocity,performance of separation increased until a maximum was reached. After that performance decreased with further increasing inlet velocity.
