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Inner Mongolia University of Science & Technology (2021)

Research on the Influence of Temperature Field in Dense Forming of Desert Shurb Branch Granules


Titre : Research on the Influence of Temperature Field in Dense Forming of Desert Shurb Branch Granules

Auteur : 于跃

Grade : Master 2021

Université : Inner Mongolia University of Science & Technology

Résumé partiel
Salix,as a unique plant that grows in desert areas,has the characteristics of reproducibility,high utilization value,economy and environmental protection,and has become the main target of new energy development.Due to the loose distribution of raw materials of Salix,low energy density,difficult storage and transportation,etc.,it cannot be fully utilized.Therefore,the biomass compacting technology plays a key role,which can transform Salix raw material into high-density,regular-shaped biomass particles,which brings great convenience to people.Aiming at the compact molding process,this paper analyzes the heat transfer mechanism and energy conversion process in the hot pressing process,and studies the evolution law of temperature changes and heat transfer characteristics in detail,which provides a theoretical reference for the promotion and development of biomass compact molding technology.In the process of biomass hot press molding,high temperature is used to soften lignin to reach its melting point,which can improve the molding quality of biomass while reducing the energy consumption of the molding machine.In this paper,the discrete element method is used to simulate the thermo-compression molding of biomass particles.According to the characteristics of temperature rise,the overall change process of biomass particles is divided into three stages:the initial stage,the compression stage,and the pressure-holding stage.Analyze the temperature field gradient changes in each stage ;According to the different particle positions,compare its temperature rise changes and temperature differences ;Under the same compression conditions,select different particle density,thermal conductivity,specific heat capacity and other related thermodynamic physical properties and change the particle size,shape,compression speed and other controllable physical properties After the model reaches the equilibrium state,the heat transfer effect of the particles is explored during the entire compression process,and the control variable method is used to analyze the significance of the influence of the molding process parameters on the temperature of the biomass particles.The results show that:in the initial stage,the gap between the particles is large,and the temperature does not change significantly ;the average particle temperature rises sharply in the compression stage ;the temperature change is gentler in the pressure holding stage and finally reaches the thermal equilibrium

Mots clés : Salix granules ;Discrete element ;Heat transfer ;Compact shape ;Temperature field ;

Présentation (CNKI)

Page publiée le 14 mars 2022