Abstract
A scheme of a gas–liquid mixed jet is designed by installing gas distributor at the bottom of a stirred tank reactor to generate Taylor vortex. The eddy flow characteristics and mass transfer mechanism in the reactor are analyzed by numerical simulation and experiment. The results show that the evolution law of Taylor vortex in a stirred tank reactor with a rotating Reynolds number is similar to that in a conventional Taylor reactor. The Taylor vortex generated in the stirred tank reactor creates a partial plug flow region in the original complete mixing flow pattern, which reduces back mixing, the plug flow area expands with the increase of rotating Reynolds number. Under the condition of a critical rotating Reynolds number (Recr), the gas phase homogeneity of the reactor is increased by 28% and the dissolved oxygen rate is increased by about 5 times, which effectively improves the flow condition in the reactor and strengthens the mass transfer efficiency between the gas and liquid. The research results provide a theoretical basis for breaking through the limitation of small reaction space of conventional Taylor flow reactor and expanding production scale. The refit of kettle reactor is universal and easy to operate.
Highlights
The stirred tank reactor is widely used in chemical, petroleum, biological and other fields [1–4]
The Taylor vortex is introduced into a stirred tank reactor to improve the flow and mass transfer characteristics of the reactor by designing a scheme of a gas–liquid mixed jet
Recent studies have proved that the axial back mixing in the Taylor flow reactor is small and the reaction driving force is high, and the existence of Taylor vortex will strengthen the heat and mass transfer of the reactor [8,9]
Summary
The stirred tank reactor is widely used in chemical, petroleum, biological and other fields [1–4]. The stirred tank reactor is stable, reliable and flexible in continuous production, but it is not suitable for reactions with high conversion rates because of the back mixing of fluid in the reactor caused by stirring [5]. The Taylor vortex is introduced into a stirred tank reactor to improve the flow and mass transfer characteristics of the reactor by designing a scheme of a gas–liquid mixed jet. Recent studies have proved that the axial back mixing in the Taylor flow reactor is small and the reaction driving force is high, and the existence of Taylor vortex will strengthen the heat and mass transfer of the reactor [8,9]. InIntthhiiss paper,, tthheestsitrirrerdedtatnaknkTaTylaoyrlorerarcetoarctiosrcoismcpoamrepdawreidthwthiethcotnhveecnotinovneanltTioanyalolr Tflaoywlorreflaocwtorr;etahcetogra;st–hleiqguaisd–ltiwquo-ipdhtawsoe-flpohwasienfltohwe rienacthtoerriesanctuomr eisrincualmlyesrimcaulllyatseidmbuylaCteFdD btyecChFnDoltoegcyhnanodlocgoymapnadrecodmwpitahretdheweixtphetrhiemeexnptaelrirmeseunltsa,lprerosuvildtsi,npgrgouvidainngcegauniddarnecferaenndce refoferrtehnecsetufodrytohfethsteufldoywofchthareacfltoewristcihcasraancdtemrisatsicsstraanndsfemramssecthraannsisfemr omfetchhearneiascmtoro.f the reactor
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