CSTR Stirring Blade Design And Experimental Research

At present,most of the biogas projects using CSTR(continuous stirred tank reactor)have poor operation results,which affects the further development of the biogas industry.The factors affecting the mixing effect of the fermentation process mainly include reactor structure,stirring mode,raw material characteristics,test temperature and the like.Among them,the structure and stirring mode of the reactor have been fixed and difficult to adjust when the biogas project is completed.This paper studies the obtained agitated structure.The specific research contents are as follows:(1)For the mixed raw materials under the five ratios,the viscosity test is carried out under different temperature conditions to determine the relationship of pseudoplastic fluid,and the optimal viscosity value is obtained for the selection of the later computational fluid dynamics(CFD)simulation parameters.(2)Using the existing CFD software to simulate the three-dimensional single-phase turbulent flow field in a single-layer stirred and double-stirred reactor,and simulate the liquid in the reactor as a unidirectional flow.Observe the mixing of single-layer stirring and double-layer stirring on the mixed raw materials,and analyze and discuss the influence of different parameters(mixer speed,flow field viscosity)on the flow field characteristics(vorticity,pressure,etc.)in the reactor.(3)The three-dimensional model of the stirring paddle is physically produced and tested and verified.After experimental demonstration,the accuracy of CFD simulation simulation results is proved,and the mixing effect and gas production rate between single and double-layer blades are compared,and the mixing condition of single-layer double-stacking structure is demonstrated.This paper summarizes and summarizes the research status of CSTR and agitator at home and abroad,provides basic technical support and ideas development,and studies the design and test of CSTR mixing paddle structure,and draws corresponding results and conclusions.Combining apparent viscosity,CFD numerical simulation and experimental verification,from the combination of material characteristics and agitation structure,the research on CSTR agitating structure under laboratory conditions has stronger technical and accuracy,which can provide some reference for subsequent research.