Study On The Influence Of Grinding Chamber Components And Fiber Morphology On Energy Consumption Of Fiber Preparation

Fiberboard is one of the main kinds of wood-based panels.It has the advantages of smooth surface,fine material and good mechanical properties.It is widely used in construction,furniture manufacturing and other industries.In the production process of fiberboard,the grinding chamber components of defibrator and fiber morphology will have a great impact on the quality of fiberboard and the energy consumption in the production process.Therefore,improving the defibrator structure of grinding chamber components and fiber morphology can improve the fiber yield and utilization rate,save raw materials and reduce energy consumption.On the premise of ensuring the quality of fiberboard preparation,maximize its economic benefits.It provides a theoretical basis for the optimization of fiber preparation process and equipment.At the same time,improving the production efficiency,production quality and economic and social ecological benefits of fiberboard conforms to the future development trend of wood-based panel market.It has a positive significance for promoting the vigorous development of wood-based panel industry.In this paper,the structure of the grinding chamber components(grinding disc and grinding chamber body)of the defibrator and fiber morphology are studied;the research statuses of fiber separation mechanism,refining disc and grinding chamber,fiber preparation and energy consumption in the process of refining at home and abroad are analyzed.The influences of grinding disc,grinding chamber body and chip on fiber dissociation quality and energy consumption are deeply analyzed.It lays a foundation for exploring the influence of grinding disc,grinding chamber body and fiber morphology changing on fiber preparation quality and energy consumption.The three-dimensional modeling,structure design and finite element analysis of the grinding disc structure of the defibrator are carried out.Before and after the structure improvement design,the differences of the temperature field,heat flux,thermal stress and thermal stability,fiber dissociation quality,life and energy consumption of the grinding disc are studied through the establishment of the model,grid division and thermal analysis.The result shows that after designing the streamlined grinding teeth and changing the inclination of the grinding teeth in the coarse grinding area and the fine grinding area,the temperature field and heat flux distribution of the grinding disc are more uniform;the thermal expansion uniformity and local thermal stress concentration are reduced;the parallelism between dynamic and static refining discs change is relatively small and the thermal stability of refining discs is improved.The production application shows that the energy loss is reduced by 19.1%.It verifies the rationality of the improved design of the grinding disc structure.This paper analyzes the structure of the grinding chamber bodies of the defibrator and studies the differences of the fiber flow pattern,energy consumption and the shape change of the grinding chamber bodies between the traditional and the new grinding chamber bodies through the establishment of models,grid division and flow field analysis.The result shows that the fiber flow state is improved after the new structure of grinding chamber body is adopted;the cavity volume and the resistance of the fiber in the cavity are reduced.After the fiber moves regularly around the inner wall,it flows out from the discharge port along the tangent direction of the arc;the pressure on the connection between the upper and lower grinding chamber bodies,deformation and the steam overflow decrease;the fiber quality and grinding efficiency are improved;the energy consumption is reduced.The effect of fiber mesh number(40-100 mesh,20-120 mesh,10-130 mesh)on the mechanical properties of fiberboard is studied by mechanical property experiment,and the rationality of determining fiber mesh range is verified.Through the combination of single factor experimental analysis of different density and resin content by using the determined fiber mesh intervals to analyse its influence on the mechanical properties of fiberboard.The costs of fiber preparation and product are comprehensively analyzed,so as to achieve the reasonable matching between fiber mesh interval and product quality on the premise of ensuring the mechanical properties and maximizing economic benefits.To some extent,the research provides theoretical basis and technical support for the production of fiberboard,and promotes the further research on the relationship between the grinding chamber components of defibrator and fiber morphology,fiber preparation quality and energy consumption in the production of fiberboard in China.The use of the research results can improve the yield and quality of fiberboard.It has theoretical and practical significance.