Optimization Design And Experimental Study On Flat Die Of Biomass Briquetting Machine

Biomass briquetting technology is a utilization way of biomass resources compressing the agricultural and forestry wastes which were crushed by mechanical pressure into solid fuel with certain shape and density.This utilization mode not only greatly improvement the utilization efficiency, and good to solve the transportation and storage problems in the process of biomass utilization. Based on the background of the die roller forming technology, this paper expands research on biomass flat die molding machine. Aiming at the flat die biomass briquetting machine present in the flat die badly worn, not easy maintenance and replacement of equipment as well as low yields, high energy consumption, this paper has carried on the theoretical analysis and experimental research from four aspects as follows:(1) In view of the biomass material forming mechanism to carry out the experiments to explore the forming process.With crushed corn stalks as experimental subjects, using the designed molds to study the effects of the preheating temperature, particle size, moisture content of the material, compression speed and dwell time on its thermoforming by orthogonal experiment method, derive the strength relationship of various factors on the quality of biomass briquette and compressing consumption. Using the Comprehensive balance method to evaluate the forming conditions,obtained the optimal forming conditions in this situations is that preheat temperature of100℃, material particle size of3-6mm, material moisture content of15%, the compression speed of40mm/min, the holding time of80s.(2) Based on the flat die wear characteristics, carry out the optimal design and experimental research of the flat die.In view of the integral die double-sided use features, innovative design a straight cone compound symmetry model hole, and carry out the theoretical analyses and experimental research. The results of the experiments are that the relaxation density is1.26g/cm3and forming consumption per ton is16.8kWh/t with the parameters of die hole length to diameter ratio of7:1, die hole wall roughness of3.2, mould opening cone angle of30°and die hole neck shrinkage of2.05:1, which show that the forming effects are good.(3) According to the application of flat die in the engineering, carry out the experimental research.The motion characteristics and mechanical properties of the flat die biomass briquetting machine were analyzed, and on the platform of biomass briquetting machine named PM-LX75-Ⅱ, carry out the test and Analysis in the engineering, obtained the relationship between flat die of molding machine and production, briquette forming rate, relaxation density and mechanical durability. The test results show that:straight cone compound model hole is most advantageous for biomass solid fuel, molding machine consumption is31.4kWh/t, the relaxation density is1.28g/cm3.Through theoretical analysis and experimental research, get some experimental data and conclusions; hope to provide certain reference for the development of biomass briquetting technology.