The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Mohammad Reza Rahimpour - One of the best experts on this subject based on the ideXlab platform.
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simulation and feasibility analysis of structured packing replacement in absorption column of natural gas dehydration process a case study for farashband gas Processing Plant iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Seyyed Mohammad Jokar, Hamid Reza Rahimpour, Hossein Momeni, Mohammad Reza Rahimpour, Hamed AbbasfardAbstract:Abstract Application of structured packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of structured packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration Plant of Farashband gas Processing Plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of structured packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with structured packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas Processing Plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable.
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simulation and feasibility analysis of structured packing replacement in absorption column of natural gas dehydration process a case study for farashband gas Processing Plant iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Seyyed Mohammad Jokar, Hamid Reza Rahimpour, Hossein Momeni, Mohammad Reza Rahimpour, Hamed AbbasfardAbstract:Abstract Application of structured packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of structured packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration Plant of Farashband gas Processing Plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of structured packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with structured packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas Processing Plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable.
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Application of solid oxide fuel cell for flare gas recovery as a new approach; a case study for Asalouyeh gas Processing Plant, Iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Majid Saidi, F. Siavashi, Mohammad Reza RahimpourAbstract:Abstract Flare gas emission is one of the main sources of environmental pollution and global warming. Implementations of some no flaring methods have a great impact in reducing the pollutants emission. Using solid oxide fuel cell (SOFC) system is a new approach which is proposed in this study. In this work, an electrochemical model is developed for a steady-state, planar SOFC by considering the direct internal methane steam reforming. In this new configuration, there is no pre-reforming and the sweetened flare gas is fed to SOFC directly. Also a part of required steam is supplied by recycling the anode outlet gas. The present model is validated with experimental and modeling data taken from the literature. Application of SOFC technology for flare gas recovery of Asalouyeh gas Processing Plant not only generates about 1200 MW electrical energy, but also it decreases the equivalent mass of greenhouse gas emission from 1700 kg/s to 68 kg/s. Economical evaluations show that the total capital investment of this method is significantly lower than other no gas flaring approaches. For parametric investigation, the effects of some related parameters such as temperature, recirculation, fuel utilization and air ratios are studied. The results show that increasing the operating temperature of SOFC enhances the cell voltage and maximum power density. Decreasing the recirculation ratio from 0.6 to 0.2 increases the electrical efficiency of the cell. Although at lower current densities, changing the recirculation ratio has no significant effect, it is observed that at average current density equals to 1.5 A/cm 2 , increasing the recirculation ratio from 0.2 to 0.6 decreases the power density from 0.51 W/cm 2 to 0.48 W/cm 2 . Also increasing the fuel utilization ratio improves the cell performance.
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Investigating the performance of dehydration unit with Coldfinger technology in gas Processing Plant
Journal of Natural Gas Science and Engineering, 2013Co-Authors: Mohammad Reza Rahimpour, Seyyed Mohammad Jokar, Pouyan Feyzi, Raheleh AsghariAbstract:Natural Gas is usually saturated with water which must be removed in order to protect the gas system from corrosion and hydrate formation. TEG dehydrators are the most common equipment to remove water from produced gas. TEG regeneration by Coldfinger technology has been recognized as one of the promising processes for dehydrating natural gas. In this work the dehydration unit of the domestic gas Processing Plant was simulated in the presence of a Coldfinger system. The lack of a Coldfinger unit in steady state simulation software makes simulation difficult, so, first the Coldfinger was modeled. The predicted results for Coldfinger were compared with Plant data. There was a good consistency between them. Then the proposed model was added in the steady state simulation software. Finally, the result of simulation was used to investigate the influence of flow rate and temperature of stripping gas and pressure of Coldfinger, on regeneration rate. This research resulted in beneficial information about the performance of the Coldfinger technology.
Seyyed Mohammad Jokar - One of the best experts on this subject based on the ideXlab platform.
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simulation and feasibility analysis of structured packing replacement in absorption column of natural gas dehydration process a case study for farashband gas Processing Plant iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Seyyed Mohammad Jokar, Hamid Reza Rahimpour, Hossein Momeni, Mohammad Reza Rahimpour, Hamed AbbasfardAbstract:Abstract Application of structured packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of structured packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration Plant of Farashband gas Processing Plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of structured packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with structured packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas Processing Plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable.
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simulation and feasibility analysis of structured packing replacement in absorption column of natural gas dehydration process a case study for farashband gas Processing Plant iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Seyyed Mohammad Jokar, Hamid Reza Rahimpour, Hossein Momeni, Mohammad Reza Rahimpour, Hamed AbbasfardAbstract:Abstract Application of structured packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of structured packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration Plant of Farashband gas Processing Plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of structured packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with structured packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas Processing Plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable.
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Investigating the performance of dehydration unit with Coldfinger technology in gas Processing Plant
Journal of Natural Gas Science and Engineering, 2013Co-Authors: Mohammad Reza Rahimpour, Seyyed Mohammad Jokar, Pouyan Feyzi, Raheleh AsghariAbstract:Natural Gas is usually saturated with water which must be removed in order to protect the gas system from corrosion and hydrate formation. TEG dehydrators are the most common equipment to remove water from produced gas. TEG regeneration by Coldfinger technology has been recognized as one of the promising processes for dehydrating natural gas. In this work the dehydration unit of the domestic gas Processing Plant was simulated in the presence of a Coldfinger system. The lack of a Coldfinger unit in steady state simulation software makes simulation difficult, so, first the Coldfinger was modeled. The predicted results for Coldfinger were compared with Plant data. There was a good consistency between them. Then the proposed model was added in the steady state simulation software. Finally, the result of simulation was used to investigate the influence of flow rate and temperature of stripping gas and pressure of Coldfinger, on regeneration rate. This research resulted in beneficial information about the performance of the Coldfinger technology.
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wax formation assessment of condensate in south pars gas Processing Plant sea pipeline a case study
Journal of Natural Gas Science and Engineering, 2013Co-Authors: M R Rahimpour, Seyyed Mohammad Jokar, M Davoudi, I Khoramdel, Alireza Shariati, M R DehnaviAbstract:Abstract The wax deposition from the gas condensate in South Pars gas Processing Plant causes a number of severe problems. These problems include: (1) deposits form on the reboiler tubes of stabilizer column and tend to reduce its duty (2) forcing periodic shut-down and removal of deposits (3) interrupting normal Processing operations. An understanding of deposition, nature and propensity is necessary to mitigate the mentioned problems. In this work, the multi solid phase model is used to predict the wax precipitation from gas condensate fluid. For five different reservoir fluids, several methods were investigated to split the heavy hydrocarbon fraction into pseudo fractions. The results show that the Al-Meshari method is the most accurate one. Also, a set of consistent correlations were used to calculate the critical points, fusion properties and the acentric factor of the single carbon number groups in the extended composition. Finally the best methods for predicting the wax formation are selected and used to predict the wax formation in the sea line of South Pars gas Processing Plant. The modeling shows that wax precipitation starts at 293 K and 86 bar. At this pressure and temperature the pipeline is 94 km away from the wellhead.
Hamed Abbasfard - One of the best experts on this subject based on the ideXlab platform.
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simulation and feasibility analysis of structured packing replacement in absorption column of natural gas dehydration process a case study for farashband gas Processing Plant iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Seyyed Mohammad Jokar, Hamid Reza Rahimpour, Hossein Momeni, Mohammad Reza Rahimpour, Hamed AbbasfardAbstract:Abstract Application of structured packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of structured packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration Plant of Farashband gas Processing Plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of structured packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with structured packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas Processing Plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable.
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simulation and feasibility analysis of structured packing replacement in absorption column of natural gas dehydration process a case study for farashband gas Processing Plant iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Seyyed Mohammad Jokar, Hamid Reza Rahimpour, Hossein Momeni, Mohammad Reza Rahimpour, Hamed AbbasfardAbstract:Abstract Application of structured packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of structured packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration Plant of Farashband gas Processing Plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of structured packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with structured packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas Processing Plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable.
Theodoros H. Varzakas - One of the best experts on this subject based on the ideXlab platform.
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application of failure mode and effect analysis fmea and cause and effect analysis in conjunction with iso22000 to an almond Processing Plant
XIV GREMPA Meeting on Pistachios and Almonds Athens Greece 30 March-4 April 2008., 2010Co-Authors: Theodoros H. Varzakas, George Zakynthinos, Ioannis S ArvanitoyannisAbstract:Failure Mode and Effect Analysis (FMEA) model has been applied for the risk assessment of almond manufacturing. A tentative approach of FMEA application to the almond industry was attempted in conjunction with ISO22000. Preliminary Hazard Analysis was used to analyse and predict the occurring failure modes in a food chain system (almond Processing Plant), based on the functions, characteristics and/or interactions of the processes, upon which the system depends. Critical Control Points have been identified and implemented in the cause and effect diagrams. Moreover, comparison of ISO22000 analysis with HACCP is carried out over almond Processing and packaging. The main emphasis was put on the quantification of risk assessment by determining the Risk Priority Number (RPN) per identified Processing hazard. Pasteurisation, fumigation with propylene oxide, packaging, storage and distribution and hulling/shelling were the processes identified as t he ones with the highest RPN (240, 225, 180, 144, respectively) and corrective actions were undertaken. Following the application of corrective actions, a second calculation of RPN values was carried out leading to considerably lower values (below the upper acceptable limit of 130). It is noteworthy that the application of Ishikawa (Cause and Effect or Tree diagram) led to converging results thus corroborating the validity of conclusions derived from risk assessment and FMEA. Therefore, the incorporation of FMEA analysis within the ISO22000 system of an almond Processing Plant is considered imperative.
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application of failure mode and effect analysis fmea and cause and effect analysis in conjunction with iso 22000 to a snails helix aspersa Processing Plant a case study
Critical Reviews in Food Science and Nutrition, 2009Co-Authors: Ioannis S Arvanitoyannis, Theodoros H. VarzakasAbstract:Failure Mode and Effect Analysis (FMEA) has been applied for the risk assessment of snails manufacturing. A tentative approach of FMEA application to the snails industry was attempted in conjunction with ISO 22000. Preliminary Hazard Analysis was used to analzse and predict the occurring failure modes in a food chain system (snails Processing Plant), based on the functions, characteristics, and/or interactions of the ingredients or the processes, upon which the system depends. Critical Control points have been identified and implemented in the cause and effect diagram (also known as Ishikawa, tree diagram, and fishbone diagram). In this work a comparison of ISO22000 analysis with HACCP is carried out over snails Processing and packaging. However, the main emphasis was put on the quantification of risk assessment by determining the RPN per identified Processing hazard. Sterilization of tins, bioaccumulation of heavy metals, packaging of shells and poisonous mushrooms, were the processes identified as the o...
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Application of failure mode and effect analysis (FMEA) and cause and effect analysis in conjunction with ISO 22000 to a snails (Helix aspersa) Processing Plant; A case study
Critical Reviews in Food Science and Nutrition, 2009Co-Authors: Ioannis S Arvanitoyannis, Theodoros H. VarzakasAbstract:Failure Mode and Effect Analysis (FMEA) has been applied for the risk assessment of snails manufacturing. A tentative approach of FMEA application to the snails industry was attempted in conjunction with ISO 22000. Preliminary Hazard Analysis was used to analyze and predict the occurring failure modes in a food chain system (snails Processing Plant), based on the functions, characteristics, and/or interactions of the ingredients or the processes, upon which the system depends. Critical Control points have been identified and implemented in the cause and effect diagram (also known as Ishikawa, tree diagram, and fishbone diagram). In this work a comparison of ISO22000 analysis with HACCP is carried out over snails Processing and packaging. However, the main emphasis was put on the quantification of risk assessment by determining the RPN per identified Processing hazard. Sterilization of tins, bioaccumulation of heavy metals, packaging of shells and poisonous mushrooms, were the processes identified as the ones with the highest RPN (280, 240, 147, 144, respectively) and corrective actions were undertaken. Following the application of corrective actions, a second calculation of RPN values was carried out leading to considerably lower values (below the upper acceptable limit of 130). It is noteworthy that the application of Ishikawa (Cause and Effect or Tree diagram) led to converging results thus corroborating the validity of conclusions derived from risk assessment and FMEA. Therefore, the incorporation of FMEA analysis within the ISO22000 system of a snails Processing industry is considered imperative.
Hamid Reza Rahimpour - One of the best experts on this subject based on the ideXlab platform.
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simulation and feasibility analysis of structured packing replacement in absorption column of natural gas dehydration process a case study for farashband gas Processing Plant iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Seyyed Mohammad Jokar, Hamid Reza Rahimpour, Hossein Momeni, Mohammad Reza Rahimpour, Hamed AbbasfardAbstract:Abstract Application of structured packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of structured packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration Plant of Farashband gas Processing Plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of structured packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with structured packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas Processing Plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable.
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simulation and feasibility analysis of structured packing replacement in absorption column of natural gas dehydration process a case study for farashband gas Processing Plant iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Seyyed Mohammad Jokar, Hamid Reza Rahimpour, Hossein Momeni, Mohammad Reza Rahimpour, Hamed AbbasfardAbstract:Abstract Application of structured packing in separation processes like natural gas dehydration has been increased since last few years. Replacement of the existing trayed column with that of structured packing can enhance the capacity and performance of the natural gas dehydration process. In this work, the natural gas dehydration Plant of Farashband gas Processing Plant has been simulated. The profile of concentration, temperature and pressure in absorption column was obtained. A computer program, prepared with Visual Basic, has been proposed to calculate the height equivalent to a theoretical plate (HETP) of structured packing. The effect of some important parameters of inlet Tri-ethylene glycol (TEG) and natural gas on the performance of absorption column have been analyzed. Results show that revamp of trays with structured packing, can reduce outlet natural gas dew point and improve the positive effect of other parameters on the performance of dehydration unit. Moreover, the most significant factors affecting the HETP were investigated which were less than 15% effective. Finally, the cost of the modification project for the absorption column in the Farashband gas Processing Plant was calculated. The cost is evaluated 202,909 $ in this case and replacing was found economically justifiable.
