The Experts below are selected from a list of 2376 Experts worldwide ranked by ideXlab platform
Qinghai Jiang - One of the best experts on this subject based on the ideXlab platform.
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Optimization of a straw ring-die Briquetting process combined analytic hierarchy process and grey correlation analysis method
Fuel Processing Technology, 2016Co-Authors: Xia Xianfei, Yu Sun, Qinghai JiangAbstract:Abstract Briquetting of biomass is an attractive option to mitigate the energy crisis and environmental problems. A device to make this transformation is called ring-die Briquetting system. In this research, a study on the optimization of a rice straw ring-die Briquetting process combined analytic hierarchy process and grey correlation analysis was presented. Optimization variables include moisture content, particle size of the raw material, temperature, and the gap between the roller and ring-die while the average energy consumption, productivity, density and the rate of qualified biofuels were optimization objects. Results showed that moisture content and clearance between die and roller influenced productivity, energy consumption and product density significantly. The optimum process condition was obtained around moisture content of 20%, with a clearance between die and roller of 2.5 mm, die temperature of 120 °C and particle size between 20–35 mm. Experimental verification results indicated that this combination of factors produced a better overall pelleted fuel.
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Modeling of a Straw Ring-die Briquetting Process
Bioresources, 2014Co-Authors: Xia Xianfei, Yu Sun, Qinghai JiangAbstract:Efficient utilization of biomass resources is crucial for providing renewable energy and mitigating the risk of environmental pollution caused by crop straw burning in China. Straw ring-die Briquetting forming is a convenient densification technology to make the low density biomass into briquette fuel; however, the energy consumption of this process is still a challenge. Productivity and torque modeling were carried out in this study on the basis of theoretical derivation. Generally, the straw Briquetting process is divided into a compression deformation stage and an extrusion forming stage with the die structure (ring die and roller radius ratio λ) and friction angle φ being the main factors that affect the productivity. Mechanical modeling based on material compaction and calculation modeling based on die-hole pressure were considered for the calculation of σαx in the torque model. A calculation case was then conducted according to the theoretical model, and actual productivity and torque testing were performed for validation purposes. Results show that this deduced productivity model is successful because the deviation is 4.61%. The torque model determined by the calculation model based on die-hole pressure had a better accuracy with a deviation of 6.76%.
Xia Xianfei - One of the best experts on this subject based on the ideXlab platform.
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Optimization of a straw ring-die Briquetting process combined analytic hierarchy process and grey correlation analysis method
Fuel Processing Technology, 2016Co-Authors: Xia Xianfei, Yu Sun, Qinghai JiangAbstract:Abstract Briquetting of biomass is an attractive option to mitigate the energy crisis and environmental problems. A device to make this transformation is called ring-die Briquetting system. In this research, a study on the optimization of a rice straw ring-die Briquetting process combined analytic hierarchy process and grey correlation analysis was presented. Optimization variables include moisture content, particle size of the raw material, temperature, and the gap between the roller and ring-die while the average energy consumption, productivity, density and the rate of qualified biofuels were optimization objects. Results showed that moisture content and clearance between die and roller influenced productivity, energy consumption and product density significantly. The optimum process condition was obtained around moisture content of 20%, with a clearance between die and roller of 2.5 mm, die temperature of 120 °C and particle size between 20–35 mm. Experimental verification results indicated that this combination of factors produced a better overall pelleted fuel.
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Modeling of a Straw Ring-die Briquetting Process
Bioresources, 2014Co-Authors: Xia Xianfei, Yu Sun, Qinghai JiangAbstract:Efficient utilization of biomass resources is crucial for providing renewable energy and mitigating the risk of environmental pollution caused by crop straw burning in China. Straw ring-die Briquetting forming is a convenient densification technology to make the low density biomass into briquette fuel; however, the energy consumption of this process is still a challenge. Productivity and torque modeling were carried out in this study on the basis of theoretical derivation. Generally, the straw Briquetting process is divided into a compression deformation stage and an extrusion forming stage with the die structure (ring die and roller radius ratio λ) and friction angle φ being the main factors that affect the productivity. Mechanical modeling based on material compaction and calculation modeling based on die-hole pressure were considered for the calculation of σαx in the torque model. A calculation case was then conducted according to the theoretical model, and actual productivity and torque testing were performed for validation purposes. Results show that this deduced productivity model is successful because the deviation is 4.61%. The torque model determined by the calculation model based on die-hole pressure had a better accuracy with a deviation of 6.76%.
Yu Sun - One of the best experts on this subject based on the ideXlab platform.
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Optimization of a straw ring-die Briquetting process combined analytic hierarchy process and grey correlation analysis method
Fuel Processing Technology, 2016Co-Authors: Xia Xianfei, Yu Sun, Qinghai JiangAbstract:Abstract Briquetting of biomass is an attractive option to mitigate the energy crisis and environmental problems. A device to make this transformation is called ring-die Briquetting system. In this research, a study on the optimization of a rice straw ring-die Briquetting process combined analytic hierarchy process and grey correlation analysis was presented. Optimization variables include moisture content, particle size of the raw material, temperature, and the gap between the roller and ring-die while the average energy consumption, productivity, density and the rate of qualified biofuels were optimization objects. Results showed that moisture content and clearance between die and roller influenced productivity, energy consumption and product density significantly. The optimum process condition was obtained around moisture content of 20%, with a clearance between die and roller of 2.5 mm, die temperature of 120 °C and particle size between 20–35 mm. Experimental verification results indicated that this combination of factors produced a better overall pelleted fuel.
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Modeling of a Straw Ring-die Briquetting Process
Bioresources, 2014Co-Authors: Xia Xianfei, Yu Sun, Qinghai JiangAbstract:Efficient utilization of biomass resources is crucial for providing renewable energy and mitigating the risk of environmental pollution caused by crop straw burning in China. Straw ring-die Briquetting forming is a convenient densification technology to make the low density biomass into briquette fuel; however, the energy consumption of this process is still a challenge. Productivity and torque modeling were carried out in this study on the basis of theoretical derivation. Generally, the straw Briquetting process is divided into a compression deformation stage and an extrusion forming stage with the die structure (ring die and roller radius ratio λ) and friction angle φ being the main factors that affect the productivity. Mechanical modeling based on material compaction and calculation modeling based on die-hole pressure were considered for the calculation of σαx in the torque model. A calculation case was then conducted according to the theoretical model, and actual productivity and torque testing were performed for validation purposes. Results show that this deduced productivity model is successful because the deviation is 4.61%. The torque model determined by the calculation model based on die-hole pressure had a better accuracy with a deviation of 6.76%.
S J Mangena - One of the best experts on this subject based on the ideXlab platform.
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binderless Briquetting of some selected south african prime coking blend coking and weathered bituminous coals and the effect of coal properties on binderless Briquetting
International Journal of Coal Geology, 2007Co-Authors: S J Mangena, V M Du CannAbstract:Abstract The binderless Briquetting of some selected South African prime coking and blend coking coals, as well as the effects of weathering on the binderless Briquetting of some inertinite-rich bituminous coals, were investigated in the laboratory. Selected properties of these coals were determined and the coals were briquetted at various moisture contents and pressures. Based on the results obtained in this study, binderless Briquetting was found to be most successful in the cases of the fresh, vitrinite-rich coking and blend coking coals and satisfactory in the fresh inertinite-rich Witbank coals. However, the bonding process seemed to be adversely affected by weathering. The negative impact on bonding could be ameliorated to some extent by the presence of a significant kaolinite content when the percentage ash reports in the order of more than 15% (air-dry basis). It should, however, be noted that kaolinite may reduce the water resistance of the briquettes.
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the amenability of some witbank bituminous ultra fine coals to binderless Briquetting
Fuel Processing Technology, 2004Co-Authors: S J Mangena, G J De Korte, Robert I Mccrindle, D L MorganAbstract:Five ultra fine bituminous coals from the Witbank coalfield were studied. Selected chemical and physical properties, coal petrographic characteristics and mineralogical compositions of the coals were measured. The coals were compacted, using a Briquetting press, at various feed moisture contents. The formed briquettes were then tested for compressive strength and water resistance and the values correlated with the coal characteristics and the Briquetting conditions. The coals were found to be amenable to conventional binderless Briquetting. The bonding in the briquettes was found to be due mainly due to the impurities in the coals, particularly kaolinite. This may add a new perspective to the fundamentals of the binderless Briquetting of bituminous coals.
Ayhan Demirbas - One of the best experts on this subject based on the ideXlab platform.
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Briquetting Properties of Biomass Waste Materials
Energy Sources, 2004Co-Authors: Ayhan Demirbas, Ayse Sahin-demirbasAbstract:In this study, some Briquetting properties such as moisture content, shatter index, compressive strength, water resistance, heating value, and combustion of briquettes from pulping reject and spruce wood sawdust were determined. The strongest briquettes (shatter index 20500, compressive strength 49.5 MPa) produced using spruce wood sawdust were achieved with a moisture content of 15% at a Briquetting pressure of 350 MPa. The effect of the moisture content on the compressive strength and the shatter index of the briquette samples from pulping reject and spruce sawdust were studied. The results suggest that as the moisture content of the briquette samples increased significantly, the compressive strength and shatter index of the briquettes also increased.
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physical properties of briquettes from waste paper and wheat straw mixtures
Energy Conversion and Management, 1999Co-Authors: Ayhan DemirbasAbstract:Abstract Briquetting may be considered as a good idea to utilise low grade combustible materials obtained from biomass sources. Studies demonstrated that waste paper and wheat straw or their mixtures can be compressed to a relative density greater than unity and stabilised at that density without binder material. A reduction in the volume of the material also provides its technological benefit, i.e., the material could be transported and stored more economically than is possible at present. The effects of the Briquetting pressure on the density, moisture content and compressive strength of the briquettes were examined at six different pressures (300, 400, 500, 600, 700 and 800 MPa). The optimum moisture contents and Briquetting pressures were found to be, respectively, 18% and 780 MPa for waste paper, 22% and 710 MPa for wheat straw and 18% and 750 MPa for a 20%(w) waste paper–straw mixture. The effect of the temperature on the briquette density of wheat straw was determined. The best wheat straw briquettes were obtained at 385 K.
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Evaluation of Biomass Materials as Energy Sources: Upgrading of Tea Waste by Briquetting Process
Energy Sources, 1999Co-Authors: Ayhan DemirbasAbstract:Tea waste was briquetted at ambient and elevated temperatures in a calibrated laboratory hydraulic press using a punc and die set for 5-30 minutes under pressures of 300 800 MPa. The effects of the Briquetting pressure on the density, the moisture content, and the compressive strength of the briquetts were examined at different pressures. The optimum moisture contents and compressive strengths were found to be 15-18 % and 36.2-37.1 MPa for tea waste samples. The effect of the Briquetting temperature and time on the briquette density of tea waste were determined.