The Experts below are selected from a list of 214791 Experts worldwide ranked by ideXlab platform
Mehdi Mehrpooya - One of the best experts on this subject based on the ideXlab platform.
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Investigation of a novel integrated Process Configuration for natural gas liquefaction and nitrogen removal by advanced exergoeconomic analysis
Applied Thermal Engineering, 2018Co-Authors: Mehdi Mehrpooya, Mohammad Mehdi Moftakhari Sharifzadeh, Hojat AnsarinasabAbstract:Abstract A novel integrated Process Configuration for natural gas liquefaction and nitrogen removal is introduced and analyzed. The Process Configuration and specification of the streams and components are presented. Next, the Process is evaluated by the conventional and advanced exergy and exergoeconomic methods. Based on the results exergy efficiency and exergy destruction rates of the Process are gained 41.27% and 89,904 kW, respectively. Exergy destruction and investment cost rates within the Process components are divided into avoidable-unavoidable and endogenous-exogenous parts. From this analysis, improvement potentials of the Process component's performance and investment costs of the Process were determined by using the economic relations between them. The results indicate that exergy destruction and investment cost rates in the Process components are endogenous. The Process components interactions do not affect the exergy efficiency significantly. The cost of exergy destruction in the compressors is avoidable while investment costs in these components are unavoidable. The cost of exergy destruction in the heat exchangers and air coolers is unavoidable while investment costs in these components are avoidable.
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a novel hydrogen liquefaction Process Configuration with combined mixed refrigerant systems
International Journal of Hydrogen Energy, 2017Co-Authors: Majid Asadnia, Mehdi MehrpooyaAbstract:Abstract A novel large-scale plant for hydrogen liquefying is proposed and analyzed. The liquid hydrogen production rate of the proposed plant is 100 tons per day to provide the required LH2 for a large urban area with 100,000–200,000 hydrogen vehicles supply. In the pre-cooling section of the Process, a new mixed refrigerant (MR) refrigeration cycle, combined with a Joule–Brayton refrigeration cycle, precool gaseous hydrogen feed from 25 °C to the temperature −198.2 °C. A new refrigeration system with six simple Linde–Hampson cascade cycles cools low-temperature gaseous hydrogen from −198.2 °C to temperature −252.2 °C. The Process specific energy consumption (SEC) is 7.69 kWh/kg L H 2 which minimum value is 2.89 kWh/kg L H 2 in ideal conditions. The exergy efficiency of the system is 39.5%, which is considerably higher than the existing hydrogen liquefier plants around the world. However, assuming more efficiency values for the equipment can improve it. The energy analysis specifies that coefficient of performance (COP) of the Process is 0.1710 which is a high quantity of its kind between other similar Processes. Effect of various refrigerant components concentration, discharge pressure of the high pressure compressors of the pre-cooling section, and hydrogen feed pressure on the Process COP, exergy efficiency, and SEC are investigated. After that, a new MR will be offered for the cryogenic section of the plant. The system improvements are considerable comparing to current hydrogen liquefying plants, therefore, the proposed conceptual system can be used for future hydrogen liquefaction plants design.
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a novel Process Configuration for hydrocarbon recovery Process with auto refrigeration system
Journal of Natural Gas Science and Engineering, 2017Co-Authors: Mehdi Mehrpooya, Ali Vatani, Farid Sadeghian, Mohammad Hossein AhmadiAbstract:Abstract A new Process for recovery of natural gas liquids from a treated feed gas is introduced and analyzed. This Process applies demethanizer and deethanizer columns in order to produce pure methane and ethane as main products. The needed refrigeration is supplied by a self-refrigeration system. The results show that the self-refrigeration compression power is 38.57% less than the external propane refrigeration cycle. Ethane and propane plus recoveries are greater than 90% and 95% respectively. Energy and exergy analysis of the Process is done and results show that the towers and expansion valves have the highest irreversibility while irreversibility of the heat exchangers are acceptable.
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evaluation of novel Process Configurations for coproduction of lng and ngl using advanced exergoeconomic analysis
Applied Thermal Engineering, 2017Co-Authors: Hojat Ansarinasab, Mehdi MehrpooyaAbstract:Abstract Advanced exergoeconomic analysis is applied on two novel Process Configurations for co-production of LNG and NGL. Dual mixed refrigerant (DMR) and mixed fluid cascade (MFC) refrigeration systems are used for supplying the required refrigeration. Based on the avoidable cost of exergy destruction in DMR Process Configuration, C-300 compressor with 504.43 ($/h) and in MFC Process Configuration, C-200A compressor with 251.05 ($/h) should be modified first. Based on the avoidable endogenous/exogenous part, three strategies are proposed for reducing exergy destruction cost in the Process components. Cost of exergy destruction and investment in most of the Process components are endogenous. So interactions among the components in these Processes is not strong. Investment cost of turbo expander and compressors are unavoidable due to technological and economic limits while air coolers and heat exchangers have potential for improvement. Cost of exergy destruction of the air coolers and heat exchangers are unavoidable while turbo expander and compressors are avoidable.
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advanced exergoeconomic analysis of a novel Process for production of lng by using a single effect absorption refrigeration cycle
Applied Thermal Engineering, 2017Co-Authors: Hojat Ansarinasab, Mehdi MehrpooyaAbstract:Abstract A novel two refrigeration cycle Process Configuration for production of the liquefied natural gas is introduced and analyzed. In this Process a single effect absorption refrigeration cycle which provides the refrigeration at −30 °C is used as the precooling cycle. Coefficient of performance for this cycle is 0.49. The second cycle is a mixed refrigerant vapor compression refrigeration system. The results show that liquefaction efficiency is 0.20 kW h kg LNG . This Process is analyzed and compared with the conventional propane precooled mixed refrigerant (C3MR) Process. Next conventional and advanced exergoeconomic analysis methods are used to evaluate the modified Process. Based on the exergoeconomic factor values, compressors and air coolers investment costs should be considered for improvement of the Process. Endogenous exergy destruction in all of the Process components is higher than the exogenous. Results of the splitting of exergy destruction costs indicate that avoidable exogenous destruction portion is very small.
M Gadalla - One of the best experts on this subject based on the ideXlab platform.
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exceeding pinch limits by Process Configuration of an existing modern crude oil distillation unit a case study from refining industry
Journal of Cleaner Production, 2019Co-Authors: Omar S Bayomie, Omar Abdelaziz, M GadallaAbstract:Abstract Crude Distillation Unit (CDU) represents significant challenge for retrofitting and energy optimisation as the most energy intensive consumer in a conventional crude oil refinery. Pinch Technology and its based-methodologies are found primary keys for decades to energy savings in refining industries for a range of common economic-based and environmental objectives or applications. Typical benefits in energy savings are reported within 20–40% of original designs. However, such savings are limited and questioned when modern refiners are dealt with. The current paper addresses the revamping of a modern refinery exhibiting an existing high energy efficiency (≈93%). This implies the maximum potential energy savings would only be 7% at current Process conditions. The present research proposes an algorithm that tackles energy recovery of modern refiners, enabling additional savings beyond the energy targets set by the existing Process. The algorithm starts by Process simulation and validation against real plant data, followed by a network optimisation, e.g. stream splitting, to reach the energy targets set by Pinch Analysis. The energy targets are then moved to another lower level by performing potential Process modifications to reduce the energy consumption further. Results showed that the current modern refinery unit could reach its energy targets by stream splitting modifications with hot energy savings of 2.69 MW. Process modifications resulted in additional energy savings of 31.3% beyond the current level of the existing plant alongside less than a year of payback period for estimated capital investment. An environmental assessment is performed, and comparable reductions were obtained with respect to greenhouse gas, with reduction in CO2 emissions by 45.1%. The proposed retrofit methodology is applicable to minimising energy consumptions of refiners including modern units to achieve energy levels beyond energy targets by new Process modifications.
Hojat Ansarinasab - One of the best experts on this subject based on the ideXlab platform.
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Investigation of a novel integrated Process Configuration for natural gas liquefaction and nitrogen removal by advanced exergoeconomic analysis
Applied Thermal Engineering, 2018Co-Authors: Mehdi Mehrpooya, Mohammad Mehdi Moftakhari Sharifzadeh, Hojat AnsarinasabAbstract:Abstract A novel integrated Process Configuration for natural gas liquefaction and nitrogen removal is introduced and analyzed. The Process Configuration and specification of the streams and components are presented. Next, the Process is evaluated by the conventional and advanced exergy and exergoeconomic methods. Based on the results exergy efficiency and exergy destruction rates of the Process are gained 41.27% and 89,904 kW, respectively. Exergy destruction and investment cost rates within the Process components are divided into avoidable-unavoidable and endogenous-exogenous parts. From this analysis, improvement potentials of the Process component's performance and investment costs of the Process were determined by using the economic relations between them. The results indicate that exergy destruction and investment cost rates in the Process components are endogenous. The Process components interactions do not affect the exergy efficiency significantly. The cost of exergy destruction in the compressors is avoidable while investment costs in these components are unavoidable. The cost of exergy destruction in the heat exchangers and air coolers is unavoidable while investment costs in these components are avoidable.
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evaluation of novel Process Configurations for coproduction of lng and ngl using advanced exergoeconomic analysis
Applied Thermal Engineering, 2017Co-Authors: Hojat Ansarinasab, Mehdi MehrpooyaAbstract:Abstract Advanced exergoeconomic analysis is applied on two novel Process Configurations for co-production of LNG and NGL. Dual mixed refrigerant (DMR) and mixed fluid cascade (MFC) refrigeration systems are used for supplying the required refrigeration. Based on the avoidable cost of exergy destruction in DMR Process Configuration, C-300 compressor with 504.43 ($/h) and in MFC Process Configuration, C-200A compressor with 251.05 ($/h) should be modified first. Based on the avoidable endogenous/exogenous part, three strategies are proposed for reducing exergy destruction cost in the Process components. Cost of exergy destruction and investment in most of the Process components are endogenous. So interactions among the components in these Processes is not strong. Investment cost of turbo expander and compressors are unavoidable due to technological and economic limits while air coolers and heat exchangers have potential for improvement. Cost of exergy destruction of the air coolers and heat exchangers are unavoidable while turbo expander and compressors are avoidable.
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advanced exergoeconomic analysis of a novel Process for production of lng by using a single effect absorption refrigeration cycle
Applied Thermal Engineering, 2017Co-Authors: Hojat Ansarinasab, Mehdi MehrpooyaAbstract:Abstract A novel two refrigeration cycle Process Configuration for production of the liquefied natural gas is introduced and analyzed. In this Process a single effect absorption refrigeration cycle which provides the refrigeration at −30 °C is used as the precooling cycle. Coefficient of performance for this cycle is 0.49. The second cycle is a mixed refrigerant vapor compression refrigeration system. The results show that liquefaction efficiency is 0.20 kW h kg LNG . This Process is analyzed and compared with the conventional propane precooled mixed refrigerant (C3MR) Process. Next conventional and advanced exergoeconomic analysis methods are used to evaluate the modified Process. Based on the exergoeconomic factor values, compressors and air coolers investment costs should be considered for improvement of the Process. Endogenous exergy destruction in all of the Process components is higher than the exogenous. Results of the splitting of exergy destruction costs indicate that avoidable exogenous destruction portion is very small.
Ali Vatani - One of the best experts on this subject based on the ideXlab platform.
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a novel Process Configuration for hydrocarbon recovery Process with auto refrigeration system
Journal of Natural Gas Science and Engineering, 2017Co-Authors: Mehdi Mehrpooya, Ali Vatani, Farid Sadeghian, Mohammad Hossein AhmadiAbstract:Abstract A new Process for recovery of natural gas liquids from a treated feed gas is introduced and analyzed. This Process applies demethanizer and deethanizer columns in order to produce pure methane and ethane as main products. The needed refrigeration is supplied by a self-refrigeration system. The results show that the self-refrigeration compression power is 38.57% less than the external propane refrigeration cycle. Ethane and propane plus recoveries are greater than 90% and 95% respectively. Energy and exergy analysis of the Process is done and results show that the towers and expansion valves have the highest irreversibility while irreversibility of the heat exchangers are acceptable.
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Novel mixed fluid cascade natural gas liquefaction Process Configuration using absorption refrigeration system
Applied Thermal Engineering, 2016Co-Authors: Mehdi Mehrpooya, Mehdi Omidi, Ali VataniAbstract:Abstract In this study, a novel Process Configuration for large scale natural gas liquefaction Process is introduced and analyzed. This Configuration is based on replacement of vapor compression refrigeration cycle by absorption refrigeration system. The required heat duty in the absorption refrigeration system is obtained by available waste heat in the plant. Process simulation is done by Aspen HYSYS software which is a conventional chemical Process simulator. Coefficient of performance of the ammonia- water cycle is 0.48. Specific power consumption of the introduced Process is 0.172 kWh/kgLNG which shows 30% reduction in the power consumption. The required heat transfer area of the modified Process can be decreased up to 31%.
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novel lng based integrated Process Configuration alternatives for coproduction of lng and ngl
Industrial & Engineering Chemistry Research, 2014Co-Authors: Mehdi Mehrpooya, Mohammad Hossieni, Ali VataniAbstract:In this study, three novel Process Configurations for coproduction of LNG and NGL are introduced and analyzed. C3-MR, DMR, and MFC refrigeration systems are used for supplying the required refrigeration. High ethane recovery (90+%) and low specific power (0.4 kW-h/kg-LNG) for typical natural gas feed compositions are two of the basic characteristics of the proposed Configurations. The proposed Processes as compared to the conventional natural gas liquefaction Processes are simple and operable. Four or five multi stream heat exchangers and one demethanizer column are utilized for coproduction of LNG and NGL. Also, the analysis shows that performance of the Processes is efficient and comparable with similar cases.
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a novel Process Configuration for co production of ngl and lng with low energy requirement
Chemical Engineering and Processing, 2013Co-Authors: Ali Vatani, Mehdi Mehrpooya, Behnam TirandaziAbstract:Abstract In this study a novel integrated Process Configuration for NGL/LNG production is introduced and analyzed. This Configuration uses two mixed refrigerant cycles in order to supply the required refrigeration for production of both NGL and LNG. The results showed that not only liquefaction efficiency of the Process is considerable (0.414 kWh/kg LNG) but also it can recover the ethane (from a rich typical feed gas (methane 75%, and heavier hydrocarbons 23%)) higher than 93.3%. Four multi stream heat exchangers were utilized, the composite curves of them shows that they have been designed optimally. These heat exchangers perform their role for both targets simultaneously due to the integration of the NGL and LNG Processes. Even though this point increases their size, but the total capital costs of the plant decrease. This Process can be used for large LNG plants in the natural gas refineries. It can also be said that the overall efficiency will be higher for the leaner feed gases.
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introducing a novel integrated ngl recovery Process Configuration with a self refrigeration system open closed cycle with minimum energy requirement
Chemical Engineering and Processing, 2010Co-Authors: Mehdi Mehrpooya, Ali Vatani, S Ali M MousavianAbstract:In this study a novel Process Configuration for recovery of hydrocarbon liquids from natural gas is proposed. The required refrigeration in this Configuration is obtained by a self-refrigeration system (open–closed cycle). High performance of the multi-stream heat exchangers, high recovery levels of the hydrocarbon liquids and low required compression power (in the internal refrigeration section) are three of most important characteristic of the proposed Configuration. The effects of the mixed self-refrigerant flow rate and pressure on the performance of the Process are discussed. Various values for feed composition are tested and the results show that the Process can work efficiently with different feeds. In order to analyze the need of external refrigeration by a close or open cycle that is related to the composition of the inlet gas, a Configuration with external refrigeration is designed the manner that it is similar with the purposed Configuration in the separation section.
Omar S Bayomie - One of the best experts on this subject based on the ideXlab platform.
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exceeding pinch limits by Process Configuration of an existing modern crude oil distillation unit a case study from refining industry
Journal of Cleaner Production, 2019Co-Authors: Omar S Bayomie, Omar Abdelaziz, M GadallaAbstract:Abstract Crude Distillation Unit (CDU) represents significant challenge for retrofitting and energy optimisation as the most energy intensive consumer in a conventional crude oil refinery. Pinch Technology and its based-methodologies are found primary keys for decades to energy savings in refining industries for a range of common economic-based and environmental objectives or applications. Typical benefits in energy savings are reported within 20–40% of original designs. However, such savings are limited and questioned when modern refiners are dealt with. The current paper addresses the revamping of a modern refinery exhibiting an existing high energy efficiency (≈93%). This implies the maximum potential energy savings would only be 7% at current Process conditions. The present research proposes an algorithm that tackles energy recovery of modern refiners, enabling additional savings beyond the energy targets set by the existing Process. The algorithm starts by Process simulation and validation against real plant data, followed by a network optimisation, e.g. stream splitting, to reach the energy targets set by Pinch Analysis. The energy targets are then moved to another lower level by performing potential Process modifications to reduce the energy consumption further. Results showed that the current modern refinery unit could reach its energy targets by stream splitting modifications with hot energy savings of 2.69 MW. Process modifications resulted in additional energy savings of 31.3% beyond the current level of the existing plant alongside less than a year of payback period for estimated capital investment. An environmental assessment is performed, and comparable reductions were obtained with respect to greenhouse gas, with reduction in CO2 emissions by 45.1%. The proposed retrofit methodology is applicable to minimising energy consumptions of refiners including modern units to achieve energy levels beyond energy targets by new Process modifications.
