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Athanasios Dimitriadis - One of the best experts on this subject based on the ideXlab platform.
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temperature effect on co hydroprocessing of heavy gas oil waste cooking oil mixtures for hybrid diesel production
Fuel, 2013Co-Authors: Stella Bezergianni, Athanasios DimitriadisAbstract:Abstract The effect of temperature on hydrotreating of heavy gas oil (HGO)–waste cooking oil (WCO) mixtures was studied. Three different types of feedstock were studied, 100% HGO, 90/10 HGO/WCO and 70/30 HGO/WCO. Temperature is the most dominant Operating Parameter which defines catalyst performance as well as catalyst life. In this analysis, a hydrotreating temperature range of 310–350 °C was explored via a series of three experiments (310 °C, 330 °C and 350 °C). Several Parameters were considered for evaluating the effect of temperature including heteroatom removal, conversion, pour point, hydrogen consumption and saturation of double bonds. For all experiments the same commercial hydrotreating catalyst was utilized (NiMo/Al2O3), while the remaining Operating Parameters were kept constant (pressure = 1200 psig, LHSV = 1.0 h−1, H2/Oil ratio = 505.9 nl/l, liquid feed = 40 ml/h, and gas feed = 21804 ml/h).
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Temperature effect on co-hydroprocessing of heavy gas oil–waste cooking oil mixtures for hybrid diesel production
Fuel, 2013Co-Authors: Stella Bezergianni, Athanasios DimitriadisAbstract:Abstract The effect of temperature on hydrotreating of heavy gas oil (HGO)–waste cooking oil (WCO) mixtures was studied. Three different types of feedstock were studied, 100% HGO, 90/10 HGO/WCO and 70/30 HGO/WCO. Temperature is the most dominant Operating Parameter which defines catalyst performance as well as catalyst life. In this analysis, a hydrotreating temperature range of 310–350 °C was explored via a series of three experiments (310 °C, 330 °C and 350 °C). Several Parameters were considered for evaluating the effect of temperature including heteroatom removal, conversion, pour point, hydrogen consumption and saturation of double bonds. For all experiments the same commercial hydrotreating catalyst was utilized (NiMo/Al2O3), while the remaining Operating Parameters were kept constant (pressure = 1200 psig, LHSV = 1.0 h−1, H2/Oil ratio = 505.9 nl/l, liquid feed = 40 ml/h, and gas feed = 21804 ml/h).
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hydrotreating of waste cooking oil for biodiesel production part i effect of temperature on product yields and heteroatom removal
Bioresource Technology, 2010Co-Authors: Stella Bezergianni, Athanasios Dimitriadis, Aggeliki Kalogianni, Petros A PilavachiAbstract:Abstract Hydrotreating of waste cooking oil (WCO) was studied as a process for biofuels production. The hydrotreatment temperature is the most dominant Operating Parameter which defines catalyst performance as well as catalyst life. In this analysis, a hydrotreating temperature range of 330–398 °C was explored via a series of five experiments (330, 350, 370, 385 and 398 °C). Several Parameters were considered for evaluating the effect of temperature including product yields, conversion, selectivity (diesel and gasoline), heteroatom removal (sulfur, nitrogen and oxygen) and saturation of double bonds. For all experiments the same commercial hydrotreating catalyst was utilized, while the remaining Operating Parameters were constant (pressure = 1200 psig, LHSV = 1.0 h−1, H2/oil ratio = 4000 scfb, liquid feed = 0.33 ml/min and gas feed = 0.4 scfh). It was observed that higher reactor temperatures are more attractive when gasoline production is of interest, while lower reaction temperatures are more suitable when diesel production is more important.
Stella Bezergianni - One of the best experts on this subject based on the ideXlab platform.
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temperature effect on co hydroprocessing of heavy gas oil waste cooking oil mixtures for hybrid diesel production
Fuel, 2013Co-Authors: Stella Bezergianni, Athanasios DimitriadisAbstract:Abstract The effect of temperature on hydrotreating of heavy gas oil (HGO)–waste cooking oil (WCO) mixtures was studied. Three different types of feedstock were studied, 100% HGO, 90/10 HGO/WCO and 70/30 HGO/WCO. Temperature is the most dominant Operating Parameter which defines catalyst performance as well as catalyst life. In this analysis, a hydrotreating temperature range of 310–350 °C was explored via a series of three experiments (310 °C, 330 °C and 350 °C). Several Parameters were considered for evaluating the effect of temperature including heteroatom removal, conversion, pour point, hydrogen consumption and saturation of double bonds. For all experiments the same commercial hydrotreating catalyst was utilized (NiMo/Al2O3), while the remaining Operating Parameters were kept constant (pressure = 1200 psig, LHSV = 1.0 h−1, H2/Oil ratio = 505.9 nl/l, liquid feed = 40 ml/h, and gas feed = 21804 ml/h).
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Temperature effect on co-hydroprocessing of heavy gas oil–waste cooking oil mixtures for hybrid diesel production
Fuel, 2013Co-Authors: Stella Bezergianni, Athanasios DimitriadisAbstract:Abstract The effect of temperature on hydrotreating of heavy gas oil (HGO)–waste cooking oil (WCO) mixtures was studied. Three different types of feedstock were studied, 100% HGO, 90/10 HGO/WCO and 70/30 HGO/WCO. Temperature is the most dominant Operating Parameter which defines catalyst performance as well as catalyst life. In this analysis, a hydrotreating temperature range of 310–350 °C was explored via a series of three experiments (310 °C, 330 °C and 350 °C). Several Parameters were considered for evaluating the effect of temperature including heteroatom removal, conversion, pour point, hydrogen consumption and saturation of double bonds. For all experiments the same commercial hydrotreating catalyst was utilized (NiMo/Al2O3), while the remaining Operating Parameters were kept constant (pressure = 1200 psig, LHSV = 1.0 h−1, H2/Oil ratio = 505.9 nl/l, liquid feed = 40 ml/h, and gas feed = 21804 ml/h).
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hydrotreating of waste cooking oil for biodiesel production part i effect of temperature on product yields and heteroatom removal
Bioresource Technology, 2010Co-Authors: Stella Bezergianni, Athanasios Dimitriadis, Aggeliki Kalogianni, Petros A PilavachiAbstract:Abstract Hydrotreating of waste cooking oil (WCO) was studied as a process for biofuels production. The hydrotreatment temperature is the most dominant Operating Parameter which defines catalyst performance as well as catalyst life. In this analysis, a hydrotreating temperature range of 330–398 °C was explored via a series of five experiments (330, 350, 370, 385 and 398 °C). Several Parameters were considered for evaluating the effect of temperature including product yields, conversion, selectivity (diesel and gasoline), heteroatom removal (sulfur, nitrogen and oxygen) and saturation of double bonds. For all experiments the same commercial hydrotreating catalyst was utilized, while the remaining Operating Parameters were constant (pressure = 1200 psig, LHSV = 1.0 h−1, H2/oil ratio = 4000 scfb, liquid feed = 0.33 ml/min and gas feed = 0.4 scfh). It was observed that higher reactor temperatures are more attractive when gasoline production is of interest, while lower reaction temperatures are more suitable when diesel production is more important.
Petros A Pilavachi - One of the best experts on this subject based on the ideXlab platform.
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hydrotreating of waste cooking oil for biodiesel production part i effect of temperature on product yields and heteroatom removal
Bioresource Technology, 2010Co-Authors: Stella Bezergianni, Athanasios Dimitriadis, Aggeliki Kalogianni, Petros A PilavachiAbstract:Abstract Hydrotreating of waste cooking oil (WCO) was studied as a process for biofuels production. The hydrotreatment temperature is the most dominant Operating Parameter which defines catalyst performance as well as catalyst life. In this analysis, a hydrotreating temperature range of 330–398 °C was explored via a series of five experiments (330, 350, 370, 385 and 398 °C). Several Parameters were considered for evaluating the effect of temperature including product yields, conversion, selectivity (diesel and gasoline), heteroatom removal (sulfur, nitrogen and oxygen) and saturation of double bonds. For all experiments the same commercial hydrotreating catalyst was utilized, while the remaining Operating Parameters were constant (pressure = 1200 psig, LHSV = 1.0 h−1, H2/oil ratio = 4000 scfb, liquid feed = 0.33 ml/min and gas feed = 0.4 scfh). It was observed that higher reactor temperatures are more attractive when gasoline production is of interest, while lower reaction temperatures are more suitable when diesel production is more important.
V.k. Bajpai - One of the best experts on this subject based on the ideXlab platform.
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Design and Operating Parameter analysis to improve the performance of solar desiccant wheel using a mathematical model: part-II
International Journal of Renewable Energy Technology, 2014Co-Authors: Avadhesh Yadav, V.k. BajpaiAbstract:A mathematical model has been used to predicting the design and Operating Parameter of desiccant wheel for performance analysis of desiccant wheel. Model considered both gas and solid side resistance. The model shows good agreement with experimental data. It was found that the moisture removal and temperature difference of the process air increases with increasing process inlet moisture, regeneration temperature, regeneration inlet velocity and these decreases with increasing process/regeneration area ratio, process inlet velocity, process inlet temperature and regeneration inlet moisture. For the best moisture removal, the rotational speed must lie in the range of 15 to 25 rph.
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Operating Parameter analysis to improve the performance of solar desiccant wheel using a mathematical model: Part 1
International Journal of Renewable Energy Technology, 2013Co-Authors: Avadhesh Yadav, V.k. BajpaiAbstract:A mathematical model for analysis of various Operating Parameters to improve the performance of desiccant wheel has been used and heat and mass transfer for both moist air and the desiccant material have been considered. An experimental setup is fabricated using the evacuated tube solar air collector with desiccant wheel. The hot air needed for regeneration is produced by evacuated tube solar air collector, which has collector surface area of 4.44 m2. The regeneration can be started from 40°C. The temperature of outlet air is obtained in the range of 40–65°C by this evacuated tube solar air collector. The experimental results are used to validate the mathematical model with good agreement. The effects of velocity of the regeneration air and the process air have been studied and it was found that moisture removal of desiccant wheel increases with increase in regeneration air velocity and decrease with increase in process air velocity. On the basis of obtained results, the following recommendations have bee...
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Operating Parameter analysis to improve the performance of solar desiccant wheel using a mathematical model: Part 1
International Journal of Renewable Energy Technology, 2013Co-Authors: Avadhesh Yadav, V.k. BajpaiAbstract:A mathematical model for analysis of various Operating Parameters to improve the performance of desiccant wheel has been used and heat and mass transfer for both moist air and the desiccant material have been considered. An experimental setup is fabricated using the evacuated tube solar air collector with desiccant wheel. The hot air needed for regeneration is produced by evacuated tube solar air collector, which has collector surface area of 4.44 m2. The regeneration can be started from 40°C. The temperature of outlet air is obtained in the range of 40–65°C by this evacuated tube solar air collector. The experimental results are used to validate the mathematical model with good agreement. The effects of velocity of the regeneration air and the process air have been studied and it was found that moisture removal of desiccant wheel increases with increase in regeneration air velocity and decrease with increase in process air velocity. On the basis of obtained results, the following recommendations have been made: velocity of the process air is between 1 m/s and 2.5 m/s and the regeneration air is between 3 m/s and 5 m/s. These results are useful to study and analyse of solid desiccant dehumidification systems.
Zulquernain Mallick - One of the best experts on this subject based on the ideXlab platform.
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Optimization of the Operating Parameters of a grass trimming machine
Applied ergonomics, 2009Co-Authors: Zulquernain MallickAbstract:Abstract Hand–arm vibration syndrome (HAVS) is very common among the workers Operating power tools and doing similar nature of work for long hours. Grass trimming is one of the operations that involves use of vibrating cutter, and results in hand–arm vibration among workers. In this study, the influence of several Operating Parameters (length of nylon cutting thread, engine speed and handle material) is investigated in terms of HAV. Data are analyzed via orthogonal array, main effect, signal-to-noise (S/N) ratio, and analysis of variance to determine the appropriate Operating Parameter levels to minimize HAV. Operating Parameters under investigation are found to be influential in controlling HAV generation during grass trimming operation. Experiments are carried out for measuring hand–arm vibration using tri-axial accelerometer conforming the effectiveness of this approach. Results show that 100 mm length of nylon thread, 3000 ± 400 rpm of engine speed and ABS handle material combination results in minimum HAV (HARM) of magnitude 2.76 m/s 2 . Through this study not only the optimal Operating Parameter levels for GTM are obtained, but also the main process Parameters that affect the HAV are determined. The optimum HAV obtained through appropriate level selection of Operating Parameters, significantly reduces the occurrence of HAVS among the grass trimmers.
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Optimization of Operating Parameters for a back-pack type grass trimmer
International Journal of Industrial Ergonomics, 2008Co-Authors: Zulquernain MallickAbstract:Abstract Hand–arm vibration syndrome (HAVS) is very common among workers Operating power tools and performing similar work for extended period of time. Grass trimming involves the use of motorized cutter spinning at high speed, resulting in high levels of hand–arm vibration (HAV) among the machine operators. In this study the influence of handle–hand interaction of a grass trimming machine (GTM) is evaluated based on different hand positions of operator during operation. Besides, several Operating Parameters (length of nylon cutting thread, engine speed and sway angle) are investigated in terms of HAV. Three handle–hand positions (HHPs) are studied that are generally adopted by the GTM operators during their work. Data are analyzed via orthogonal array, main effect, signal-to-noise (S/N) ratio, and analysis of variance to determine the appropriate Operating Parameter levels and HHP to minimize HAV. HHPs and Operating Parameters under investigation are found to be influential in controlling HAV generation during grass trimming operation. Experiments are carried out for measuring hand vibration using a tri-axial accelerometer conforming the effectiveness of this approach. It is shown that among the three HHPs considered in this study, optimum result in terms of HAV is 2.42 m/s 2 . Moreover results show that 170 mm length of nylon thread, 3000±400 rpm of engine speed and 45° of sway angle combination results in minimum HAV (HARM) of magnitude 2.42 m/s 2 . Through this study not only the optimal Operating Parameter levels for GTM are obtained, but also the main process Parameters that affect the HAV are determined. The optimum HAV obtained through appropriate selection of HHP and Operating Parameters, significantly reduces the occurrence of HAVS among the grass trimmers. Relevance to industry The paper discusses the evaluation of HAV for GTM, which is widely used in Malaysia for grass trimming operation especially by the side of highways. A large number of workers are employed by the highways authority for this purpose. GTM used for this purpose should have as low HAV as possible so as to avoid damage in terms of HAVS.