The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
Sanghyun Jeong - One of the best experts on this subject based on the ideXlab platform.
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in depth analyses of organic matters in a full scale seawater desalination plant and an autopsy of reverse osmosis membrane
Separation and Purification Technology, 2016Co-Authors: Sanghyun Jeong, Gayathri Naidu, Robert Vollprecht, Torove Leiknes, S VigneswaranAbstract:Abstract In order to facilitate the global performance of seawater reverse osmosis (SWRO) systems, it is important to improve the feed water quality before it enters the RO. Currently, many desalination plants experience production losses due to incidents of organic and biofouling. Consequently, monitoring or characterizing the pretreatment step using more advanced organic and biological parameters are required for better operation to lessen fouling issues. In this study, the performance of pretreatment processes (including coagulation, dual media filtration (DMF), polishing with Cartridge Filter (CF) coupled with anti-scalant) used at Perth Seawater Desalination Plant (PSDP) located in Western Australia were characterized in terms of organic and biological fouling parameters. These analyses were carried out using liquid chromatography with organic carbon detector (LC-OCD), three dimensional-fluorescence excitation emission matrix (3D-FEEM) and assimilable organic carbon (AOC). Furthermore, the used (exhausted) RO membrane and CF were autopsied so that the fates and behaviors of organic foulants in these treatment systems could be better understood.
S Vigneswaran - One of the best experts on this subject based on the ideXlab platform.
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in depth analyses of organic matters in a full scale seawater desalination plant and an autopsy of reverse osmosis membrane
Separation and Purification Technology, 2016Co-Authors: Sanghyun Jeong, Gayathri Naidu, Robert Vollprecht, Torove Leiknes, S VigneswaranAbstract:Abstract In order to facilitate the global performance of seawater reverse osmosis (SWRO) systems, it is important to improve the feed water quality before it enters the RO. Currently, many desalination plants experience production losses due to incidents of organic and biofouling. Consequently, monitoring or characterizing the pretreatment step using more advanced organic and biological parameters are required for better operation to lessen fouling issues. In this study, the performance of pretreatment processes (including coagulation, dual media filtration (DMF), polishing with Cartridge Filter (CF) coupled with anti-scalant) used at Perth Seawater Desalination Plant (PSDP) located in Western Australia were characterized in terms of organic and biological fouling parameters. These analyses were carried out using liquid chromatography with organic carbon detector (LC-OCD), three dimensional-fluorescence excitation emission matrix (3D-FEEM) and assimilable organic carbon (AOC). Furthermore, the used (exhausted) RO membrane and CF were autopsied so that the fates and behaviors of organic foulants in these treatment systems could be better understood.
Fubao Zhou - One of the best experts on this subject based on the ideXlab platform.
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Effect of novel built-in rotator on the performance of pleated Cartridge Filter
Powder Technology, 2019Co-Authors: Shihang Li, Shuda Hu, Kang Jianhong, Fubao ZhouAbstract:Abstract Large quantities of PM (particulate matter) produced in the construction process poses hazard for both the workers' health and the whole environment. Despite the wide application of Cartridge Filters to PM collection, incomplete cleaning often occurs during pulse-jet cleaning of common nozzles. In this study, a built-in rotator used in a larger-diameter pleated Filter Cartridge was developed to improve the effect of pulse-jet cleaning. Then, the pulse-jet cleaning performances between the built-in rotator and the common nozzle were compared. The results show that the pressure drop of the built-in rotator is similar to that of the non-built-in one under the same superficial filtration velocity. The number of rotations grows with the increase of high-pressure air, while it first increases and then remains stable with the sustained pulse time. For the common nozzle, the cleaning effect is influenced by the nozzle diameter and the jet distance. The optimum jet distance declines with the increase of nozzle diameter. Compared with the common nozzle, the pulse-jet cleaning frequency of the built-in rotator reduced from 11 to 9, the average pulse-jet cleaning interval extended from 4667 s to 5402 s, the average residual pressure drop decreased from 118.39 Pa to 86.04 Pa and the average pressure drop reduced from 243.01 Pa to 232.52 Pa. Despite the average peak dust emission concentration increased from 13.52 mg/m3 to 14.34 mg/m3, the average dust emission concentration decreased from 2.56 mg/m3 to 2.51 mg/m3. Therefore, it is proved that the built-in rotator can improve the performance of pleated Cartridge Filter.
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Effects of cleaning mode on the performances of pulse-jet Cartridge Filter under varying particle sizes
Advanced Powder Technology, 2019Co-Authors: Shihang Li, Shuda Hu, Fei Wang, Shuli Song, Shimeng Zhou, Fubao ZhouAbstract:Abstract In order to solve the problem of pollution induced by particulate matters, bag Filters and pleated Cartridge Filters have been widely applied to industries. However, the effects of cleaning mode on the performances of Filters under varying particle sizes are rarely studied. In this paper, the influence of cleaning mode on the pressure drop and dust emission concentration under varying particle sizes were studied through experiments. The results show that the smaller the particle size is, the faster the pressure drop increases, and the higher the dust emission concentration becomes. In the cleaning process, the smaller the particle size, the greater the residual pressure drop, and the worse the cleaning effect. The cleaning frequency rises with the decrease of particle size under the clean-on-demand (C-D) mode, while the maximum pressure drop grows with the decrease of particle size under the clean-on-time (C-T) mode. For the medium and fine particulate matters, the average dust emission concentration and the average pressure drop under the C-D mode are both slightly larger than those under C-T mode. By comparing the quality indexes under different cleaning modes, it can be found that for medium and fine particulate matters, the use of the C-D mode can ensure more excellent filtration and cleaning performances, while for large particulate matters, the choice between the two modes has very limited influence on the filtration and cleaning performances of pulse-jet Cartridge Filters.
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Experimental investigation of the optimization of nozzles under an injection pipe in a pulse-jet Cartridge Filter
Powder Technology, 2019Co-Authors: Shihang Li, Shuda Hu, Shuli Song, Shimeng Zhou, Fubao ZhouAbstract:Abstract Pulse-jet cleaning is often used with Cartridge Filters. However, pulse-jet cleaning is non-uniform between Filter Cartridges under the same injection pipe. In this study, a pulse-jet Cartridge Filter was designed. The static pressures on the inner wall of the Filter Cartridges, the transient pressures below the nozzles, the pressure drops in the Filter Cartridges, the dust emission concentrations, and the filtration cycle length were investigated. In addition, a quality index was used to evaluate the filtration performance of the pulse-jet Cartridge Filter. The nozzle diameters were optimized using the optimization ratio of 0.76, 0.87, 0.95, 1.11, and 1.31, respectively. After optimization, the nozzle diameters were 11.5, 10.5, 10.0, 9.5, and 9.0 mm along the airflow direction of the injection pipe. At a result, the uniformity of the composite pressures on the inner wall of the Filter Cartridges and the transient pressures below the nozzles were all significantly improved. Nozzle diameter optimization decreased the filtration pressure drop, prolonged the filtration cycle, and improved the dust collection efficiency. Furthermore, the quality index increased, and the filtration performance of the pulse-jet Cartridge Filter was improved after optimization.
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Study on effects of particle size and maximum pressure drop on the filtration and pulse-jet cleaning performance of pleated Cartridge Filter
Process Safety and Environmental Protection, 2019Co-Authors: Shihang Li, Shuda Hu, Fei Wang, Fubao ZhouAbstract:Abstract In recent years, pleated Cartridge Filters have been widely used in the process of industrial production. However, most of the existing studies are focused on the structure optimization design of Filters, and there are few studies on the effects of two important factors, namely, particle size and maximum pressure drop, on the performance of Filters. So, in this study, the effects of two factors on the filtration and pulse-jet cleaning performance of pleated Cartridge Filter were investigated through experiments. For the same maximum pressure drop, both average and average residual pressure drops are reduced with the rise of particle size, and meanwhile both the number of pulse-jet cleaning and the average dust emission concentration decrease, which improves the dust collection efficiency. For the same particle size, both average and average residual pressure drops are reduced with the decrease of maximum pressure, but both the number of pulse-jet cleaning and the average dust emission concentration are increased, which lowers the dust collection efficiency.
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Analysis of the performance of a novel dust collector combining cyclone separator and Cartridge Filter
Powder Technology, 2018Co-Authors: Shihang Li, Shuda Hu, Fei Wang, Fubao ZhouAbstract:Abstract The cyclone separator has a simple structure but cannot effectively separate respirable dust of smaller particle sizes. The Cartridge Filter has a high separation efficiency, but its pressure drop increases too rapidly, requiring frequent cleaning operations. To make up for these defects, a novel Cartridge-Filtering cyclone combining both cyclone separator and Cartridge Filter is presented. Its performance parameters, including pressure drop, overall separation efficiency, grading efficiency, and cleaning interval, were studied experimentally and compared with those of the common cyclone and Cartridge Filter. The Cartridge-Filtering cyclone first pre-separates the larger particles by swirling airflow, and then Filters out the fine particles through the Filter Cartridges, thus slowing down the increasing rate of the pressure drop and forming denser dust layers attached to the surface of the Filter Cartridges. The experimental results show that the Cartridge-Filtering cyclone has a better dust removal effect. At an inlet flow rate of 50 m3/h, the separation efficiency of the Cartridge-Filtering is 99.86%, which is 15.32% and 0.05% higher than that of the common cyclone and Cartridge Filter, respectively. In particular, the Cartridge-Filtering cyclone has a preferable separation effect on fine particles, with a separation efficiency for 2.5 μm particles of 99.11%, which is 70.80% and 0.08% higher than that of the common cyclone and Cartridge Filter, respectively. Compared with the Cartridge Filter, the cleaning interval of the Cartridge-Filtering cyclone is extended and the total dust emission is reduced. Over the whole experimental period, the average cleaning interval and dust emission concentration of the Cartridge-Filtering cyclone are 1290.05 seconds and 12.06 mg/m3 respectively, while that of the Cartridge Filter are 805.32 seconds and 14.59 mg/m3, respectively.
Haiyan Chen - One of the best experts on this subject based on the ideXlab platform.
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Experimental study of the nozzle settings on blow tube in a pulse-jet Cartridge Filter
Separation and Purification Technology, 2018Co-Authors: Yunlou Qian, Haiyan Chen, Tai Kuang, Liang BianAbstract:Abstract In order to improve the cleaning effect of filtration system in a pulse-jet Cartridge Filter, the nozzle area ratio on a semi industrial pulse-jet Cartridge Filter was studied, using peak pressure and fabric acceleration as indices. Nozzle area ratio, defined as the total area of nozzles/the cross-sectional area of the blow tube. The experimental results show that the cleaning effect of the Filter Cartridge firstly increases and then decreases with the increase of nozzle area ratio. The optimum nozzle area ratio is 38.72% in this study. Furthermore, the performance of pulse valve will directly affect the influence of the nozzle area ratio on cleaning effect of a pulse-jet Cartridge Filter. The study also shows that the optimum nozzle area ratio of a pulse-jet Cartridge Filter and a pulse-jet bag Filter are different, and they are verified by experiment and literature in the study. It suggests that the nozzle area ratio of a pulse-jet Cartridge Filter cannot be designed in accordance with the parameter of a pulse-jet bag Filter.
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The relationship between peak pressure and residual dust of a pulse-jet Cartridge Filter
Powder Technology, 2015Co-Authors: Qianqian Li, Yunlou Qian, Mingxing Zhang, Fu Geng, Jincang Song, Haiyan ChenAbstract:Abstract To understand the relationship between peak pressure and residual dust of a pulse-jet Cartridge Filter, the impact of filtration velocity, jetting pressure and nozzle diameter on cleaning effect of the pulse-jet Cartridge Filter was examined in a semi industrial pulse-jet Cartridge Filter using several pleated Filter Cartridges (Φ350 × 1000 mm). The Filter was made of polyester and was coated with PTFE (Poly Tetra Fluoro Ethylene) membrane. Results show that filtration velocity could significantly affect the systematic resistance and the residual dust cakes. The smaller the filtration velocity, the less the residual dust cakes and the smaller the systematic resistance. The residual dust cakes are closely related to the peak pressure inside the Filter Cartridge. After pulse-jet cleaning, the bigger the peak pressures, the less the residual dust is. However, when the peak pressure increases to a certain threshold, the influence of filtration velocity on the dust-cleaning effect is no longer obvious. By curve fitting, the relations between peak pressures and residual dust cakes at a filtration velocity of 0.6, 0.8 and 1.0 m/min are: y = 1.0715e ^ (− 0.0004x), y = 1.4043e ^ (− 0.0005x) and y = 1.5476e ^ (− 0.0005x), respectively. Experimental results indicate that the peak pressure is a valid and reliable index for evaluating the dust-cleaning effect of a pulse-jet Cartridge Filter.
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the optimized relationship between jet distance and nozzle diameter of a pulse jet Cartridge Filter
Powder Technology, 2014Co-Authors: Yunlou Qian, Yuanxia Bi, Qing Zhang, Haiyan ChenAbstract:Abstract In order to provide a theoretical guidance for pulse-jet Cartridge Filters design, the optimized relationship between jet distance (the distance between nozzle and Cartridge opening) and nozzle diameter was investigated in a semi industrial pulse-jet Cartridge Filter, using peak pulse pressure as an index to evaluate the cleaning effect. It is found that, with the increase of jet distance, the peak pulse pressure first increases and then decreases. Obviously, there is an optimum jet distance for each nozzle diameter. And their relationship was analyzed according to fluid dynamics, showing that the optimum jet distance increases gradually with decreasing nozzle diameter and a mathematical model for optimizing jet distance S and nozzle diameter is put forward: S = D − d / 2 tan 22.43 − 0.87 d + 0.11 d 2 2 . Finally, this model was verified both by experiments and literature, demonstrating that it can be used to optimize the jet distance when Cartridge diameter and nozzle diameter were given.
Shihang Li - One of the best experts on this subject based on the ideXlab platform.
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Effect of novel built-in rotator on the performance of pleated Cartridge Filter
Powder Technology, 2019Co-Authors: Shihang Li, Shuda Hu, Kang Jianhong, Fubao ZhouAbstract:Abstract Large quantities of PM (particulate matter) produced in the construction process poses hazard for both the workers' health and the whole environment. Despite the wide application of Cartridge Filters to PM collection, incomplete cleaning often occurs during pulse-jet cleaning of common nozzles. In this study, a built-in rotator used in a larger-diameter pleated Filter Cartridge was developed to improve the effect of pulse-jet cleaning. Then, the pulse-jet cleaning performances between the built-in rotator and the common nozzle were compared. The results show that the pressure drop of the built-in rotator is similar to that of the non-built-in one under the same superficial filtration velocity. The number of rotations grows with the increase of high-pressure air, while it first increases and then remains stable with the sustained pulse time. For the common nozzle, the cleaning effect is influenced by the nozzle diameter and the jet distance. The optimum jet distance declines with the increase of nozzle diameter. Compared with the common nozzle, the pulse-jet cleaning frequency of the built-in rotator reduced from 11 to 9, the average pulse-jet cleaning interval extended from 4667 s to 5402 s, the average residual pressure drop decreased from 118.39 Pa to 86.04 Pa and the average pressure drop reduced from 243.01 Pa to 232.52 Pa. Despite the average peak dust emission concentration increased from 13.52 mg/m3 to 14.34 mg/m3, the average dust emission concentration decreased from 2.56 mg/m3 to 2.51 mg/m3. Therefore, it is proved that the built-in rotator can improve the performance of pleated Cartridge Filter.
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Effects of cleaning mode on the performances of pulse-jet Cartridge Filter under varying particle sizes
Advanced Powder Technology, 2019Co-Authors: Shihang Li, Shuda Hu, Fei Wang, Shuli Song, Shimeng Zhou, Fubao ZhouAbstract:Abstract In order to solve the problem of pollution induced by particulate matters, bag Filters and pleated Cartridge Filters have been widely applied to industries. However, the effects of cleaning mode on the performances of Filters under varying particle sizes are rarely studied. In this paper, the influence of cleaning mode on the pressure drop and dust emission concentration under varying particle sizes were studied through experiments. The results show that the smaller the particle size is, the faster the pressure drop increases, and the higher the dust emission concentration becomes. In the cleaning process, the smaller the particle size, the greater the residual pressure drop, and the worse the cleaning effect. The cleaning frequency rises with the decrease of particle size under the clean-on-demand (C-D) mode, while the maximum pressure drop grows with the decrease of particle size under the clean-on-time (C-T) mode. For the medium and fine particulate matters, the average dust emission concentration and the average pressure drop under the C-D mode are both slightly larger than those under C-T mode. By comparing the quality indexes under different cleaning modes, it can be found that for medium and fine particulate matters, the use of the C-D mode can ensure more excellent filtration and cleaning performances, while for large particulate matters, the choice between the two modes has very limited influence on the filtration and cleaning performances of pulse-jet Cartridge Filters.
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Experimental investigation of the optimization of nozzles under an injection pipe in a pulse-jet Cartridge Filter
Powder Technology, 2019Co-Authors: Shihang Li, Shuda Hu, Shuli Song, Shimeng Zhou, Fubao ZhouAbstract:Abstract Pulse-jet cleaning is often used with Cartridge Filters. However, pulse-jet cleaning is non-uniform between Filter Cartridges under the same injection pipe. In this study, a pulse-jet Cartridge Filter was designed. The static pressures on the inner wall of the Filter Cartridges, the transient pressures below the nozzles, the pressure drops in the Filter Cartridges, the dust emission concentrations, and the filtration cycle length were investigated. In addition, a quality index was used to evaluate the filtration performance of the pulse-jet Cartridge Filter. The nozzle diameters were optimized using the optimization ratio of 0.76, 0.87, 0.95, 1.11, and 1.31, respectively. After optimization, the nozzle diameters were 11.5, 10.5, 10.0, 9.5, and 9.0 mm along the airflow direction of the injection pipe. At a result, the uniformity of the composite pressures on the inner wall of the Filter Cartridges and the transient pressures below the nozzles were all significantly improved. Nozzle diameter optimization decreased the filtration pressure drop, prolonged the filtration cycle, and improved the dust collection efficiency. Furthermore, the quality index increased, and the filtration performance of the pulse-jet Cartridge Filter was improved after optimization.
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Study on effects of particle size and maximum pressure drop on the filtration and pulse-jet cleaning performance of pleated Cartridge Filter
Process Safety and Environmental Protection, 2019Co-Authors: Shihang Li, Shuda Hu, Fei Wang, Fubao ZhouAbstract:Abstract In recent years, pleated Cartridge Filters have been widely used in the process of industrial production. However, most of the existing studies are focused on the structure optimization design of Filters, and there are few studies on the effects of two important factors, namely, particle size and maximum pressure drop, on the performance of Filters. So, in this study, the effects of two factors on the filtration and pulse-jet cleaning performance of pleated Cartridge Filter were investigated through experiments. For the same maximum pressure drop, both average and average residual pressure drops are reduced with the rise of particle size, and meanwhile both the number of pulse-jet cleaning and the average dust emission concentration decrease, which improves the dust collection efficiency. For the same particle size, both average and average residual pressure drops are reduced with the decrease of maximum pressure, but both the number of pulse-jet cleaning and the average dust emission concentration are increased, which lowers the dust collection efficiency.
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Analysis of the performance of a novel dust collector combining cyclone separator and Cartridge Filter
Powder Technology, 2018Co-Authors: Shihang Li, Shuda Hu, Fei Wang, Fubao ZhouAbstract:Abstract The cyclone separator has a simple structure but cannot effectively separate respirable dust of smaller particle sizes. The Cartridge Filter has a high separation efficiency, but its pressure drop increases too rapidly, requiring frequent cleaning operations. To make up for these defects, a novel Cartridge-Filtering cyclone combining both cyclone separator and Cartridge Filter is presented. Its performance parameters, including pressure drop, overall separation efficiency, grading efficiency, and cleaning interval, were studied experimentally and compared with those of the common cyclone and Cartridge Filter. The Cartridge-Filtering cyclone first pre-separates the larger particles by swirling airflow, and then Filters out the fine particles through the Filter Cartridges, thus slowing down the increasing rate of the pressure drop and forming denser dust layers attached to the surface of the Filter Cartridges. The experimental results show that the Cartridge-Filtering cyclone has a better dust removal effect. At an inlet flow rate of 50 m3/h, the separation efficiency of the Cartridge-Filtering is 99.86%, which is 15.32% and 0.05% higher than that of the common cyclone and Cartridge Filter, respectively. In particular, the Cartridge-Filtering cyclone has a preferable separation effect on fine particles, with a separation efficiency for 2.5 μm particles of 99.11%, which is 70.80% and 0.08% higher than that of the common cyclone and Cartridge Filter, respectively. Compared with the Cartridge Filter, the cleaning interval of the Cartridge-Filtering cyclone is extended and the total dust emission is reduced. Over the whole experimental period, the average cleaning interval and dust emission concentration of the Cartridge-Filtering cyclone are 1290.05 seconds and 12.06 mg/m3 respectively, while that of the Cartridge Filter are 805.32 seconds and 14.59 mg/m3, respectively.
