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Study of Briquetting Properties and Frictional Heat Distribution Law of the Reciprocating Straw Briquetting Based on ANSYS

Author: DuHongGuang
Tutor: DongYuPing
School: Shandong University
Course: Mechanical Design and Theory
Keywords: Biomass Straw molding Finite Element The main compression Frictional heat
CLC: TK6
Type: Master's thesis
Year: 2011
Downloads: 93
Quote: 0
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Abstract


Straw curing technology enables the loose straw densification to improve the of straw energy density and combustion characteristics, so that it can be directly as a clean energy alternative to coal is used in various fields of production and living, as well as to solve the straw storage, transportation difficulties problem is achieve straw comprehensive, large-scale use of technical means. But the technology needs in the characteristics of the molding process and molding friction heat to deepen the theoretical study, to reveal straw forming the bonding mechanism, to provide a theoretical basis for the molding to predict and control of the quality of the products, equipment optimization. Through straw chemical composition, physical properties and room temperature forming mechanism of the analysis, the key factors affect the the straw room temperature curing quality compression force and the molding process, the frictional heat. Based on the conclusion, based on the characteristics of the batch production of piston-molding technology, the piston time stamping molding in forming force change and material movement of experimental research, \before goes on stage is reached, the material is equivalent to compress still maintained by mold and by friction under molding products consisting of closed environment. The use of elastic-plastic mechanics, contact mechanics, viscoelasticity and finite element theory straw Curing main compression stage finite element analysis to study the main compression stage material deformation law, the stress distribution and contact stress situation, to provide a way for mold design and molding process improvement guidance and basis. Tribology, heat transfer theory, combined with the characteristics of the straw piston-normal temperature molding technology, to study the frictional heat molding process, through the introduction of the average pressure, the equivalent speed and other physical quantities derive the equations frictional heat generated in the molding process, the molding the process friction heat into the second, three types of boundary conditions without heat source of non-steady-state heat transfer problems; establish molding frictional heat finite element analysis model, the distribution of temperature field caused by the friction heat, and by experimental validation is limited element simulation correctness draw frictional heat caused by the variation of the temperature field; experimental prototype different productivity under conditions of friction thermal simulation analysis, studies have shown that mold the role of the frictional heat, the temperature over time increased and stabilized at a certain temperature, its growth rate and the steady-state temperature with the increase in productivity and improved. Currently Straw raw material material of hot material resistance parameters lack the status quo in the frictional heat caused by the temperature field of law research foundation straw physical properties of the parameters of the experimental study, draw straw thermal conductivity coefficient, specific heat with moisture content, temperature and density changes in the law, while This paper studies the friction heat caused the temperature field in the conduction of molding products provide data to support the can straw material heat-related technology research provides basis; build straw molding process friction heat conduction model, analysis of different friction heat under the conditions of the products within the distribution and analysis of lignin bonding role, studies have shown that the temperature distribution of the products within the common decision of the residence time in the mold by the mold temperature and products; experimental prototype for this article, although when the production rate 60kg / h when the temperature of the field caused by the frictional heat can reach 220 to 230 ° C, the production rate of 50kg / h when the temperature field of 180 to 190 ° C, but due to the article within the mold residence time, the production rate of 50kg / h, products Center lignin can also reach the softening temperature, forming higher quality; the research for molding production process improvement, and improve building quality and equipment designed to provide a theoretical basis.

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