The Experts below are selected from a list of 1014 Experts worldwide ranked by ideXlab platform
R.q. Honaker - One of the best experts on this subject based on the ideXlab platform.
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Pilot Scale Single Stage Fine Coal Dewatering and Briquetting Process. Technical report, March 1, 1996 - May 31, 1996
1996Co-Authors: J.w. Wilson, R.q. Honaker, Y. DingAbstract:The primary goal for this ICCI coal research project is to effectively liberate coal from fnely disseminated minerals for Illinois Basin coal by using fine grinding and cleaning Processes. However, because of the large surface area generated during the cleaning Processes, it is difficult and uneconomic for conventional techniques to dewater the coal fines. In addition, these coal fine pose transportation, storage and handling problems at cleaning and utility facilities. The objective of this research is to combine dewatering and Briquetting Processes into a single stage operation that will solve the problems mentioned above. To build on the promising results obtained from the previous studies, a pilot scale commercial Briquetting machine was used to evaluate this technique. The primary objective of the research in this reporting period is to determine the effectiveness of a single stage dewatering and Briquetting technique using a commercial Briquetting device. Two types of samples were prepared and the results of the -28 x 100 mesh samples are presented in this report. Modifications were made to the machine in an attempt to solve the back drainage problem. A total of six experiments were conducted and the results indicate that water resistance of coal briquettes increased as curing time increased. However, due to a deficiency of fine particles to bridge the gaps between the coarse particles, the wear resistance of the products declined. Also, at high roll speeds and compaction pressures, the coal briquettes produced tended to have higher moisture content and lower strength. On the other hand, at high feed rates, because of the screw extrusion effect, coal briquettes were produced with lower moisture content and higher strengths.
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Pilot scale single stage fine coal dewatering and Briquetting Process. Technical report, September 1--November 30, 1995
1995Co-Authors: J.w. Wilson, Y. Ding, R.q. HonakerAbstract:The primary goal of the current coal preparation research is to reduce the ash and sulfur content from coal, using fine grinding and various coal cleaning Processes to separate finely disseminated mineral matter and pyrite from coal. Small coal particles are produced by the grinding operation, thus the ultrafine coal becomes very difficult to dewater. In addition, the ultrafine coal also creates problems during its transportation, storage and handling at utility plants. The current research is seeking to combine ultrafine coal dewatering and Briquetting Processes into a single stage operation, using hydrophobic binders as coal dewatering and binding reagents with the help of a compaction device. From previous tests, it has been found that coal pellets with a moisture content of less than 15% and good wear and water resistance can be successfully fabricated at pressures of less than 6,000 psi using a lab scale ram extruder. The primary objective of the research described in this quarter has been to extend the lab scale ultrafine coal dewatering and Briquetting Process into a pilot scale operation, based on the test data obtained from earlier research. A standard roller Briquetting machine was used to dewater fine coal-binder mixtures during the Briquetting Process.more » The operating parameters, including moisture content of feed, feed rate, and roller speed, were evaluated on the basis of the performance of the briquettes. Briquettes fabricated at rates of up to 108 pellets per minute exhibited satisfactory water and wear resistance, i.e., less than 7.5% cured moisture and less than 8.3% weight loss after 6 min. of tumbling. Also, coal-binder samples with moisture contents of 40 percent have been successfully dewatered and briquetted. Briquetting of fine coal was possible under current feeding conditions, however, a better feeding system must be designed to further improve the quality of dewatered coal briquettes.« less
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Ultrafine coal single stage dewatering and Briquetting Process. Technical report, September 1--November 30, 1994
1994Co-Authors: J.w. Wilson, R.q. HonakerAbstract:It is well known that a large portion of the pyrite particles in the coal seams of the Illinois Basin, are finely disseminated within the coal matrix. In order to liberate these micron size pyrite particles, one must use a fine grinding operation. The ultrafine coal particles that are produced are difficult to dewater and they create problems in coal transportation as well as in its storage and handling at utility plants. The objective of this research project is to combine ultrafine coal dewatering and Briquetting Processes into a single stage operation. This will be accomplished by the use of bitumen based emulsions for dewatering and a compaction device for Briquetting. During this reporting period, two types of coal samples have been tested for use in the dewatering and Briquetting Processes. These tests were carried out in conjunction with a selected hydrophobic binder as the dewatering reagent and an uniaxial hydraulic press. The influence of compaction pressure and binder concentration (2 to 5%) on the performance of coal pellets have been evaluated in terms of their water and wear resistance. A laboratory scale ultrafine coal dewatering and Briquetting extruder that can be operated continuously for coal pellets fabrication, has beenmore » designed and built, and will be available for testing in the next quarter.« less
J.w. Wilson - One of the best experts on this subject based on the ideXlab platform.
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An investigation of operating variables in the fine coal dewatering and Briquetting Process
1998Co-Authors: S.w. Kan, J.w. Wilson, T. DharmanAbstract:Illinois basin coals contain minerals, including pyrite, which are finely disseminated in micron-size particles. To liberate these mineral matters from the coal matrix, an ultra-fine grinding operation is required, followed by a wet physical cleaning Process, such as column flotation. However, the resulting product possesses large surface areas that conventional dewatering techniques cannot perform effectively, and this creates transportation, storage and handling problems at utility plants. To take full advantage of these cleaning technologies, a new dewatering and coal consolidation method must be developed at the downstream end of the deep coal-cleaning Process. Following an initial study at the University of Missouri-Rolla (UMR), Briquetting was chosen to perform the dual purpose of dewatering and consolidating the fine coal. A bitumen-based emulsion, Orimulsion, proved to be an effective binder and dewatering agent in the Briquetting Process that assisted in the expulsion of water from the fine coal. This paper describes the investigation aimed at examining the relationships between several controllable operating variables. An experimental matrix was designed to examine a range of operating parameters based on earlier work conducted at the Department of Mining Engineering, University of Missouri-Rolla. A total of 13 experiments were performed using Illinois No. 6 coal samples more » that had a size fraction of 16 mesh x 0 and a moisture content of 31%. Based on results obtained from previous experiments and because of the complexity of the Briquetting Process, only two variables, roll speed and the Briquetting form pressure, were studied for their influence on moisture content, abrasion resistance and friability of briquettes. Concurring with results from previous work, the curing time of the briquettes formed had a significant impact on the moisture content and friability of the compacted fine coal product. Also, the statistical regression models generated from these results successfully established basic relationships between the operating parameters of roll speed and briquette form pressure. « less
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Pilot Scale Single Stage Fine Coal Dewatering and Briquetting Process. Technical report, March 1, 1996 - May 31, 1996
1996Co-Authors: J.w. Wilson, R.q. Honaker, Y. DingAbstract:The primary goal for this ICCI coal research project is to effectively liberate coal from fnely disseminated minerals for Illinois Basin coal by using fine grinding and cleaning Processes. However, because of the large surface area generated during the cleaning Processes, it is difficult and uneconomic for conventional techniques to dewater the coal fines. In addition, these coal fine pose transportation, storage and handling problems at cleaning and utility facilities. The objective of this research is to combine dewatering and Briquetting Processes into a single stage operation that will solve the problems mentioned above. To build on the promising results obtained from the previous studies, a pilot scale commercial Briquetting machine was used to evaluate this technique. The primary objective of the research in this reporting period is to determine the effectiveness of a single stage dewatering and Briquetting technique using a commercial Briquetting device. Two types of samples were prepared and the results of the -28 x 100 mesh samples are presented in this report. Modifications were made to the machine in an attempt to solve the back drainage problem. A total of six experiments were conducted and the results indicate that water resistance of coal briquettes increased as curing time increased. However, due to a deficiency of fine particles to bridge the gaps between the coarse particles, the wear resistance of the products declined. Also, at high roll speeds and compaction pressures, the coal briquettes produced tended to have higher moisture content and lower strength. On the other hand, at high feed rates, because of the screw extrusion effect, coal briquettes were produced with lower moisture content and higher strengths.
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Pilot scale single stage fine coal dewatering and Briquetting Process. Technical report, September 1--November 30, 1995
1995Co-Authors: J.w. Wilson, Y. Ding, R.q. HonakerAbstract:The primary goal of the current coal preparation research is to reduce the ash and sulfur content from coal, using fine grinding and various coal cleaning Processes to separate finely disseminated mineral matter and pyrite from coal. Small coal particles are produced by the grinding operation, thus the ultrafine coal becomes very difficult to dewater. In addition, the ultrafine coal also creates problems during its transportation, storage and handling at utility plants. The current research is seeking to combine ultrafine coal dewatering and Briquetting Processes into a single stage operation, using hydrophobic binders as coal dewatering and binding reagents with the help of a compaction device. From previous tests, it has been found that coal pellets with a moisture content of less than 15% and good wear and water resistance can be successfully fabricated at pressures of less than 6,000 psi using a lab scale ram extruder. The primary objective of the research described in this quarter has been to extend the lab scale ultrafine coal dewatering and Briquetting Process into a pilot scale operation, based on the test data obtained from earlier research. A standard roller Briquetting machine was used to dewater fine coal-binder mixtures during the Briquetting Process.more » The operating parameters, including moisture content of feed, feed rate, and roller speed, were evaluated on the basis of the performance of the briquettes. Briquettes fabricated at rates of up to 108 pellets per minute exhibited satisfactory water and wear resistance, i.e., less than 7.5% cured moisture and less than 8.3% weight loss after 6 min. of tumbling. Also, coal-binder samples with moisture contents of 40 percent have been successfully dewatered and briquetted. Briquetting of fine coal was possible under current feeding conditions, however, a better feeding system must be designed to further improve the quality of dewatered coal briquettes.« less
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Ultrafine coal single stage dewatering and Briquetting Process. Technical report, September 1--November 30, 1994
1994Co-Authors: J.w. Wilson, R.q. HonakerAbstract:It is well known that a large portion of the pyrite particles in the coal seams of the Illinois Basin, are finely disseminated within the coal matrix. In order to liberate these micron size pyrite particles, one must use a fine grinding operation. The ultrafine coal particles that are produced are difficult to dewater and they create problems in coal transportation as well as in its storage and handling at utility plants. The objective of this research project is to combine ultrafine coal dewatering and Briquetting Processes into a single stage operation. This will be accomplished by the use of bitumen based emulsions for dewatering and a compaction device for Briquetting. During this reporting period, two types of coal samples have been tested for use in the dewatering and Briquetting Processes. These tests were carried out in conjunction with a selected hydrophobic binder as the dewatering reagent and an uniaxial hydraulic press. The influence of compaction pressure and binder concentration (2 to 5%) on the performance of coal pellets have been evaluated in terms of their water and wear resistance. A laboratory scale ultrafine coal dewatering and Briquetting extruder that can be operated continuously for coal pellets fabrication, has beenmore » designed and built, and will be available for testing in the next quarter.« less
Wilso J.w. - One of the best experts on this subject based on the ideXlab platform.
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Pilot scale single stage fine coal dewatering and Briquetting Process. Final technical report, September 1, 1995--August 31, 1996
Illinois Dept. of Energy and Natural Resources Springfield IL (United States), 1997Co-Authors: Wilso J.w., Honake R.q., Ding Y.Abstract:The primary goal of the ongoing ICCI coal preparation research project is to reduce ash and sulfur content in coal by using fine grinding and other coal cleaning Processes. The ultrafine coal particles that result from the grinding and cleaning operations are difficult to dewater, and create problems in their storage, handling and transportation. The objective of this research is to combine the dewatering and Briquetting Processes of fine coal preparation into a single stage operation, thereby enhancing the economic viability of utilizing fine coal. A bitumen based emulsion, Orimulsion, has proven to be an effective hydrophobic binder, which helps not only with the Briquetting Process but also in the expulsion of water from the coal. Encouraging results from the use of a ram extruder Briquetting device led to experimentation in the production of briquettes using a lab scale roll Briquetting device. In the first quarter of this reporting year, a commercially available lab scale roll Briquetting machine was employed (Komarek B-100). Further testing was conducted for the rest of the year with the use of a pilot scale model (Komarek B220-A). Briquettes were produced and evaluated by comparing results developed by adjusting various parameters of the Briquetting machines and feed material. Results further substantiate previous findings that curing time dictates both moisture content and strengths of briquettes, and slower roll speeds produce more robust briquettes. A statistical model was set up to determine the optimal range of operating parameters. The statistical model generated from these results provided basic relationships between the roll speed and briquette form pressure
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Ultrafine coal single stage dewatering and Briquetting Process. Technical report, December 1, 1994--February 28, 1995
Illinois Dept. of Energy and Natural Resources Springfield IL (United States), 1996Co-Authors: Wilso J.w.Abstract:It is well known that a large portion of the pyrite particles in the coal seams of the Illinois Basin, are finely disseminated within the coal matrix. In order to liberate these micron size pyrite particles, one must use a fine grinding operation. The ultrafine coal particles that are produced are difficult to dewater and they create problems in coal transportation as well as in its storage and handling at utility plants. The objective of this research project is to combine ultrafine coal dewatering and Briquetting Processes into a single stage operation. This will be accomplished by the use of bitumen based emulsions for dewatering and a compaction device for Briquetting. During this reporting period, two types of coal samples have been tested for use in the dewatering and Briquetting Processes. These tests were carried out using Orimulsion as the dewatering reagent. A ram extruder that can be operated continuously is used to fabricate dewatered pellets. The influence of compaction pressure, curing time, binder concentration (2% to 5%), particle size, and compacting time on the performance of coal pellets have been evaluated in terms of their water resistance and wear vulnerability
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Pilot scale single stage fine coal dewatering and Briquetting Process. Technical report, September 1--November 30, 1995
Missouri Univ. Rolla MO (United States). Dept. of Mining Engineering, 1995Co-Authors: Wilso J.w., Ding Y., Honake R.q.Abstract:The primary goal of the current coal preparation research is to reduce the ash and sulfur content from coal, using fine grinding and various coal cleaning Processes to separate finely disseminated mineral matter and pyrite from coal. Small coal particles are produced by the grinding operation, thus the ultrafine coal becomes very difficult to dewater. In addition, the ultrafine coal also creates problems during its transportation, storage and handling at utility plants. The current research is seeking to combine ultrafine coal dewatering and Briquetting Processes into a single stage operation, using hydrophobic binders as coal dewatering and binding reagents with the help of a compaction device. From previous tests, it has been found that coal pellets with a moisture content of less than 15% and good wear and water resistance can be successfully fabricated at pressures of less than 6,000 psi using a lab scale ram extruder. The primary objective of the research described in this quarter has been to extend the lab scale ultrafine coal dewatering and Briquetting Process into a pilot scale operation, based on the test data obtained from earlier research. A standard roller Briquetting machine was used to dewater fine coal-binder mixtures during the Briquetting Process. The operating parameters, including moisture content of feed, feed rate, and roller speed, were evaluated on the basis of the performance of the briquettes. Briquettes fabricated at rates of up to 108 pellets per minute exhibited satisfactory water and wear resistance, i.e., less than 7.5% cured moisture and less than 8.3% weight loss after 6 min. of tumbling. Also, coal-binder samples with moisture contents of 40 percent have been successfully dewatered and briquetted. Briquetting of fine coal was possible under current feeding conditions, however, a better feeding system must be designed to further improve the quality of dewatered coal briquettes
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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Optimal Design for Rice Straw Briquetting Process Based on Experiments
Volume 2A: 42nd Design Automation Conference, 2016Co-Authors: Yu Wang, Yu Sun, Xia XianfeiAbstract:Ineffective utilization of agricultural crop straw is a big problem in agricultural developing countries. In this study, optimization design was carried out for the rice straw Briquetting Process based on experiments. A Briquetting test platform designed by the authors was used to measure the specific energy consumption, extrusion pressure, as well as the density and compressive strength of the products made by rice straw under different technological parameters. These parameters included moisture content, temperature, pressure and pressing speed. Finally, optimal technological parameters were provided based on the experimental data. Results show that, lower energy consumption and better products quality are achieved when the moisture content is within 15% ∼ 20%, the temperature is within 110 °C ∼ 120 °C, the pressure is within 50 MPa ∼ 60 MPa and the pressing speed is within 40 mm/min ∼ 60 mm/min.
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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%.