Summary: | 碩士 === 國立屏東科技大學 === 機械工程系所 === 96 === RDF technology was used as the main shaft in this research and the study of refuse derived fuel briquette from mixture of rice straw and rice bran. This research work includes three phases: Facility to smash the rice straws. Preparation and characterization of RDF-5 made from rice straw and rice bran. The optimum conditions for shape. The dried rice straws with a length between 70 and 104 cm were smashed into pieces with a size (5mm, or10mm ). The capacity per minute (kg/min ) and the qualified rate (%) of this facility at different rotation speeds of the knife holder were obtained by the following procedures. Compressing the smashed rice straws and the rice bran into the biomass briquette (RDF-5), which was a cubicalness with a volume of 47.6cm3 ; grinding the smashed rice straw and the rice bran into the powder with the size between 40 and 60 mesh, respectively, and measuring their moisture contents, ash, the extractives (Alcohol-toluene), and heating value. Measuring properties of BFB including the appearance, the air-dired density, and the percentage of volume change; charring the biomass briquettes (RDF-5), and analyzing the rate of reducing mass of RDF-5 briquettes during charcoalization; the densities of the biomass briquette with 100% rice straws and the biomass briquette with 100% rice bran are 1.01 and 1.13g/cm3, respectively. As the percentage of rice bran increases, the air-dired density of the biomass briquette becomes higher. The heat values of biomass briquette and charcoal briquette also increase with increases in the percentage of the rice bran. However, the charcoal process will not significantly promote the heat value as the percentage of rice bran exceeds 40%.
The optimum conditions for shape of straw refuse derived fuel, This research is to discuss the agglutinant, thermo-compression temperature, particle size of the rice straws and admix proportion to preparation of straw refuse derived fuel method. This experiment works include: (1)decision control factors and levels; (2)choose orthogonal arrays; (3)preparation of straw refuse derived fuel of first experiment and air-dired density; (4)computation and statistical graph; (5)acquisition of effect feather with the straw refuse derived fuel in offering percentage. The level of the agglutinant include:(1)powder of the soy beans, (2)rice bran, (3)the wood dust of Taiwan acacia. The level of the thermo-compression temperature include:(1)110℃, (2)130℃, (3)150℃. The level of particle size of the rice straws include: (1)10~5mm, (2)5~2mm, (3)below 2mm. The level of admix proportion include:(1)100/0 %, (2)80/20 %, (3)60/40 %. The experiment shown the best condition of operation is the agglutinant :powder of the rice bran , thermo-compression temperature is 150℃, particle size of the rice straws is below 2mm, and admix proportion is 80/20 %. Air-dired densities of straw refuse derived fue are 1.01~1.02 g/cm3. The values of analysis of the variance were announced that the contribution of level of particle size of the rice straws was 42.98% ,and the thermo-compression temperature was 32.16%.
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