Digital Design And Experiment Study On Biomass Peiletlzer Of Granular Burning Stoff

Study on Crop straw curing technology and molding machinery have the importantsignificance for promoting the comprehensive utilization of straw resources and acceleratingthe construction of resource-saving&environment-friendly society. Ring mold pelletizer ofgranular burning stoff is characterized by its high efficiency, simple operation and pelletformation density adjustable applicable to large-scale industrial production,product canreplace coal and oil for heating and power generation, has a broad application prospect. As thebackground of development of biomass energy utilization technology, carry out study on ringmold pelletizer digital design and experiment of the relationship between pelletizer workperformance and influence factors in the production of the straw pellet fuel, to providetheoretical basis and practical instruction for design and application of ring mold pelletizerequipment.On the basis of the analysis of the ring mold pelletizer design parameters on its effect ofwork performance research pelletizer design parameters, which determined pelletizer overalldesign scheme and key components design parameters. Based on the fatigue failure theory,according to stress analysis of pelletizer roller work process, determine the number of roller.Analysis of digital modeling technology, features and parametric modeling technology, anddigital assembly theory, three-dimensional solid models of the pelletizer parts is establishedbased on feature parametric modeling technology, and then determine the key parameters ofring mold pelletizer and the relationship between the parameters. Whole prototype of thepelletizer with digital function obtained through digital assembly and parts two-dimensionalengineering drawings are also obtained, which laid the foundation for the simulation andanalysis of pelletizer.According to Newton's theorem and Lagrange theorem derive dynamics equation ofmultibody system of pelletizer, and sum up the method to solve the equation by differentialalgebraic equations solving algorithm. Dynamics simulation analyzes through transmittingring mold pelletizer model into the ADAMS/View by using the interface software MECH/Pro.It is concluded that the roller number in4ring mold stress more reasonable through the analysis and comparison torque of spiral conveyer and the interaction force with ring moldconnection pair at different number rollers in the whole process of ring mold movement. Todetermine ring mold elastic-plastic deformation of the stress-strain relationship iselasto-plastic incremental constitutive relationship under the conditions of isotropic hardeningVon Mises model, and establishing the finite element equation of deformation stage. By use ofANSYS software finite element analysis, it is concluded that stress and displacementdistribution in ring mold pelletizing process, which provide reference for the design ofpelletizer's ring mold.Through single factor experiment and quadratic regression orthogonal rotatingcombination experiment determine moisture content, straw raw material particle size andfermentation time have influence rule on granulation rate, dropping strength and powerconsumption, established regression equation of granulation rate, dropping strength andpower consumption to influence factors. After significance test, contribution rate analysis ofeach factor and optimal solution of regression equation, identify various regression equationand the actual situation fitting, obtain the impact of important degree and order for variousexperiment factors to indicators, get the optimal level of various factors and the optimumvalue analysis result is verified by experiment, the results show that the theoretical optimalsolution and experimental values consistent with much higher, which provide the basis fordesign and application of pelletizer.Digital design system software for ring mold pelletizer is developed which realizedintelligence digital design with functions of three-dimensional solid modeling, parametricdesign, performance parameters calculation, simulation analysis of structure performance andhuman-computer interaction. Through the analysis of corn straw pellet fuel total cost, tocalculate investment payback period and net cash flow of ring mold pelletizer, and to analyzeits economic benefit, social benefit and ecological benefit, the results show that, pelletizerproduction line has the good economic benefit, social benefit and ecological benefit.