FEM Research On Biomass Briquetting And Characteristics Analysis For Roller Of Flat Mould Forming Machine

Energy is one of the most necessary resources and an important strategic material for the survival of human society and national economic development. Rapid economic development in China has resulted in energy shortages and serious environmental pollution problems, so seeking and developing renewable energy and substitute for fossil energy that appropriating our national conditions is urgent.Biomass energy resources are very rich in China, researching and developing high utilization technology of biomass energy can promote the improvement of energy structure,ensure future energy supply and raise the level rural economic development and environmental quality. It is significance for building a harmonious society.Biomass briquetting is an important branch of biomass energy conversion technology. It is significance for the development and utilization of straw biomass resources. Heilongjiang is the major grain production base in China. The agricultural and forestry waste resources are rich. The idle phenomenon is much serious. In this paper, it is base on"863" science and technology projects "The new technologies of inclined plate-type heat trough low-power precision control of biomass fast pyrolysis system for bio-fuel and hybrid emulsion fuel", and research project in Heilongjiang province "The key technology of biomass briquette manufacturing". The research object is straw. We conducted a experimental study of compression molding, investigated the impact of different raw material particle size, different moisture content, aspect ratio of different molds, different openings taper of mold to compressed density of the molding products, resolved the impact of factors for compression molding, analysed different factors on the influence of the compression molding, analysed the relationship of compression and compressed density in the loosing,transition and compressing stages in compression molding process. In the end, we derived fitted equation.Biomass briquetting expressed as geometric large deformation, elastic-plastic of materials, and the complexity of the boundary. Using nonlinear finite element theory, we analysed biomass briquetting process, determined the yield criterion and the strengthen laws, established the basic equations and the virtual work equation. Basing on finite element analysis of biomass compression molding process, we used large-scale finite element analysis software ANSYS to simulate biomass briquetting processes, investigated the impact of different raw material particle size, different moisture content, aspect ratio of different molds, different openings taper of mold to compressed density of the forming products, and compared the biomass briquetting law derived from experiments with the best value of the main impact parameters. We found Finite element software can simulate internal change in the biomass compression molding process. It is very effective for studying the law of biomass compression molding. We used large-scale finite element analysis software ANSYS to simulate internal stress-strain of biomass raw material in briquetting processes, and the temperature distribution within the material after heating, observed the impact of biomass briquetting by temperature factors, inferred soften and melt information in various sections of biomass, provided a reference for the extrusion process. It is very important that stress analysis of mould hole wall for determining pore size distribution. By forming hole deformation, stress simulation, we drawed a continuous change law of mould hole wall displacement deformation, the maximum stress in small-scale, provied reference for forming hole structure design. Through the mechanical analysis and numerical simulation for roller of flat mould forming machine working status in existing roller, we completed improved design of the roller. In the end we provide theory and reference of manufacturing flat and roll-type forming machine.This study has important strategic significance. It is not only good for providing a theoretical basis for the principle of biomass briquetting, but also for applicating widely flat mould forming machine and realizing large-scale utilization of biomass resources.