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1、FINITE ELEMENT ANALYSIS ON BIOMASS PELLETIZING PROCESS1ST TIE-LI YE College of Mechanical and Electrical Engineering, Shandong University of Science and Technology, Qingdao 266510, China T2ND HE LI College of Mechanical and Electrical Engineering, Shandong University of Science and Technology, Qingd
2、ao 266510, China 3RD LIANG WANG College of Mechanical and Electrical Engineering, Shandong University of Science and Technology, Qingdao 266510, China 4TH XIAO-FEI FANJinan Pressure Vessel Factory,Jinan 250022, CABSTRACT Biomass pelletizing is an important branch of biomass energy conversion techno
3、logy. In this article, using parametrical design module of three-dimensional solid modeling software Unigraphics NX(UG) constructs geometric model of plane-die belonging to the pivotal part of plane-die pelletizing machine. Using finite element simulation software ANSYS simulates biomass pelletizing
4、 process so as to obtain stress field of plane-die and biomass, which provide an important reference for the design and improvement of plane-die pelletizing machine.KEYWORDSBiomass, Plane-die, Simulation1. INTROUCTION Biomass compression molding is to put agricultural and forestry waste, such as the
5、 crushed crop stalks, into the molding machine, then compressed into the required shape and size by exerting certain external pressure 1. According to the different molding mechanism, compression molding machine can be divided into four categories: piston press, extruder press, matrix pellet press,
6、twist press 2. Among them, matrix pellet press can be divided into plane-die pelletizing machine and ring-die pelletizing machine.Plane-die is a pivotal part of plane-die pelletizing machine. Fig.1 shows the molding parts of plane-die pelletizing machine .Fig.1 Structure schematic drawing of molding
7、 parts2. PARAMETRIC DESIGN AND MODELING UG is a large-scale application software associated with the parametric technology, which has very powerful parametric design capabilities. In the finite element simulation results analysis of the plane-die, the geometric model need probably be repeated the ca
8、ll and modified. To great extent, UG parametric design method provides the convenience for fast modification of the model parameter. Preliminary determination of the plane-die parameters. Structure parameters of plane-die determine the fuel quality of compression molding. Its parameters mainly inclu
9、de the plane-die opening area, arrangement of model hole, dimensions of model hole, length-diameter ratio of model hole, etc. According to the mechanical industry related design standards, preliminarily determine that the outer diameter of plane-die(PM_OD1) is equal to 255mm ,the thickness of plane-
10、die (PM_HDE)is equal to 50mm, the diameter of plane- die(PM_HD)is equal to 10mm, other parameters settings are shown in Fig.2.Fig.2 Parameters dialog box of plane-die Parametric design of the plane-die. Through creating features module, characteristic operation module, editing features module and di
11、mension driven technology of UG, constructing plane-die model and producing design variables, then through the modification of design variables, to realize the parametric design of plane-die interaction levels . Fig.2, Fig.3, Fig.4 show the parametric modeling process of plane-die.Fig.3 The flow cha
12、rt of modeling of plane-dieFig.4 Plane-die3. FINITE ELEMENT SIMULATION OF BIOMASS MOLDING Using finite element analysis software ASNYS simulates the compression molding process of biomass in order to obtain the condition of contact stress and strain of plane-die and changes of the extrusion process
13、of biomass. The contact type analysis belonging to ANSYS structural analysis. Contact problem is a highly nonlinear behavior and requires large computing resources. Contact problem is divided into two kinds: one kind is the rigid body - soft body contact, another kind is the soft body - the soft bod
14、y contact. In the ordinary circumstances, when soft materials and hard materials are at contact, problems can be assumed to be the rigid body- the soft body contact 3. So this article is based on the surface-the surface contact analysis belonging to the rigid body-the soft body problem. The rigid bo
15、dy is plane-die, and the soft body is biomass materials.Building of finite element model. We assume that the biomass material is homogeneous and isotropic compressible continuum. Because of involving large plastic deformation in the course of analysis, solid182 unit type is selected to build both ge
16、ometric model. The unit is set to be axisymmetric behavior, and its real constant do not need to be defined. The contact problem belongs to surface- surface contact .The target surface is the hole wall of plane-die and the contact surface is the soft biomass material face. Therefore we will use the contact unit CONTA172 and target unit TARGE169 to simulate
