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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Gas Processing Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Simulation,Economic Evaluation,CO2 Capture,Membrane separation,Absorption method,PRO/II v.10
- چکیده:
- چکیده انگلیسی: As the main aim of this study, simulation and economic assessment of membrane technologies in comparison absorption process for CO2capturing from specified flue gas was conducted. For this purpose, the PRO/II v.10 software and Aspen Process Economic Analyzer v.10 were used. In this simulation, the flue gas flow rate is 8162 kmole/h and the concentration of CO2 in flue gas is 8-22% mole. The objective function in the simulation of CO2 capturing is to remove 85% of CO2 from the flue gas stream. The amount of required solvent and membrane surface, as well as various costs such as equipment costs, installed costs, total capital cost, total utility cost and total operating cost for different concentrations of CO2 in flue gas (8-22% mol.) was assessed for both membrane-based and absorption-based units. For CO2 selectivity and permeability values of 28 and 1097 barrer, respectively, the total capital cost in the membrane-based process is very higher than the absorption process. So, the total capital cost of the membrane unit was about 2.3 times higher than the total capital cost of the absorption process. In a low concentration of CO2, the total utility cost and total operating cost of the membrane-based process were about 2.2 times higher than the absorption process. However, by increasing the CO2 concentration the difference between these costs in two processes decreased. By analyzing the selectivity effects on the total capital costs, it is obtained that with a selectivity value of 280 and the same permeability the costs of the membrane-based process became comparable to the costs of the absorption process.
- انتشار مقاله: 14-01-1398
- نویسندگان: Mostafa Jafari,Kamran Ghasemzadeh,Taher Yusefi Amiri,Angelo Basile
- مشاهده
- جایگاه : پژوهشی
- مجله: Gas Processing Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: optimization,Ethylbenzene,Productivity,Alkylation,New arrangement
- چکیده:
- چکیده انگلیسی: In this paper, an industrial ethylbenzene production unit and two new reactor arrangements have been simulated and the results were compared. In most petrochemical plants, ethylene as ethylbenzene production feed is produced at steam thermal cracking units. Almost ethylene is produced excess in these plants because of changing feed rate, feed type and or shut down of any other user unit of ethylene. So finding a new application for consuming excess ethylene in these plants without designing new units is important. In this study, two new reactor arrangements have been proposed. In the first scenario, the 3rd bed of transalkylator plays alkylator role instead of transalkylator and in the second scenario, all three beds were used as a parallel reactor with current alkylator reactors. The results show that ethylbenzene productivity rises 22% and 20% in scenarios 1 and 2, respectively, compared to a commercial industrial unit. Finally, one of the effective parameters in ethylbenzene unit is the ratio of ethylene to benzene in the feed of all beds of reactors, so it was selected as decision variable and ethylbenzene productivity as the objective function of an optimization problem. All cases were optimized and results show 43% ethylbenzene productivity improvement in an optimized version of scenario2 in compared other scenarios.
- انتشار مقاله: 19-07-1397
- نویسندگان: Hossein Soltanalizadeh Maleki,Alireza Behroozsarand,Kamran Ghasemzadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Gas Processing Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: process simulation,Flare gas utilization,membrane applications,energy index,flare gas to gasoline (FGTG),energy and emissions efficiency
- چکیده:
- چکیده انگلیسی: The Gas to Gasoline (GTG) process includes conversion of natural, flare, and associated gas into synthetic fuels that can be compositionally upgraded and adjusted into different useful hydrocarbon fuels including gasoline, liquid petroleum gas (LPG), and fuel gas. Commonly, the GTG process involves three stages: 1) Synthesis gas (syngas) production unit 2) Methanol production unit 3) Methanol to Gasoline production unit (MTG). In this study, an integrated Flare Gas to Gasoline (FGTG) process for converting flare gas to gasoline, LPG and fuel gas is simulated using the Aspen HYSYS v. 8.8 simulator. The steam methane reforming (SMR) unit, the syngas to methanol unit, and the MTG unit are configured for simulation as an integrated FGTG process. In order to reduce carbon dioxide gas emissions to the atmosphere, a novel closed arrangement for the FGTG process (recycling configuration) is described and simulated. The simulation results demonstrate that by recycling all gas emissions, such as flare and off gas from the methanol and MTG units back into the process cycle, gasoline and LPG productivity can be increased on average by about 53% and 10%, respectively, compared to a base FGTG configuration that does not involve such recycling. The integrated simulation is supported by sensitivity analysis based on FGTG plants of various natural gas capacities (from 70,000 to 130,000 lb./hr.) as the adjustable (independent) variable and gasoline, LPG, and fuel gas selectivity as the dependent variables. Results of the simulation cases reveal that the total productivity of the integrated FGTG process could be increased in terms of flare gas mass flow, with the selectivity of products remaining approximately fixed for different plant capacities (i.e., at 75% for the gasoline product). Moreover, the utilities and energy consumption of the FGTG process is compared for several sensitivity cases. The results reveal that by increasing the capacity of the gas feed (natural gas mass flow) the Energy Index (i.e., total utilities consumption to product flow rate) decreased by about 8% and 47% in the base and recycling configurations, respectively. This finding suggests that an FGTG plant becomes more energy efficient at in higher-capacity plants.
- انتشار مقاله: 28-02-1397
- نویسندگان: Mostafa Jafari,Sadaf Ashtab,Alireza Behroozsarand,Kamran Ghasemzadeh,David A Wood
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Membrane Science and Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Modelling,carbon membrane,Polymeric membrane,Silica Membrane,H2 separation
- چکیده:
- چکیده انگلیسی: The aim of this work theoretical study is to theoretically investigate a inorganic membrane assisted purifcation process of an H2-rich stream derived from a conventional methanol steam reforming stage. In particular, a black-box model for multicomponent gas mixture purifcation is developed to evaluate the H2 separation performance of such non-palladium based membranes such as silica, polymeric and carbon membranes, by varying design and processing variables such as stage cut and feed pressure. The most signifcant modeling result is achieved by using a silica membrane based separation module in which 98% of H2 purity and 0.3% of carbon monoxide in the permeate side are reached, operating with a transmembrane pressure of 4.0 bar.
- انتشار مقاله: 04-08-1396
- نویسندگان: Kamran Ghasemzadeh,Abbas Aghaeinejad-Meybodi,Adolfo Iulianelli,Angelo Basile
- مشاهده
- جایگاه : پژوهشی
- مجله: Gas Processing Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Simulation,Economic Evaluation,CO2 Capture,Membrane separation,Absorption method,PRO/II v.10
- چکیده:
- چکیده انگلیسی: As the main aim of this study, simulation and economic assessment of membrane technologies in comparison absorption process for CO2capturing from specified flue gas was conducted. For this purpose, the PRO/II v.10 software and Aspen Process Economic Analyzer v.10 were used. In this simulation, the flue gas flow rate is 8162 kmole/h and the concentration of CO2 in flue gas is 8-22% mole. The objective function in the simulation of CO2 capturing is to remove 85% of CO2 from the flue gas stream. The amount of required solvent and membrane surface, as well as various costs such as equipment costs, installed costs, total capital cost, total utility cost and total operating cost for different concentrations of CO2 in flue gas (8-22% mol.) was assessed for both membrane-based and absorption-based units. For CO2 selectivity and permeability values of 28 and 1097 barrer, respectively, the total capital cost in the membrane-based process is very higher than the absorption process. So, the total capital cost of the membrane unit was about 2.3 times higher than the total capital cost of the absorption process. In a low concentration of CO2, the total utility cost and total operating cost of the membrane-based process were about 2.2 times higher than the absorption process. However, by increasing the CO2 concentration the difference between these costs in two processes decreased. By analyzing the selectivity effects on the total capital costs, it is obtained that with a selectivity value of 280 and the same permeability the costs of the membrane-based process became comparable to the costs of the absorption process.
- انتشار مقاله: 14-01-1398
- نویسندگان: Mostafa Jafari,Kamran Ghasemzadeh,Taher Yusefi Amiri,Angelo Basile
- مشاهده
- جایگاه : پژوهشی
- مجله: Gas Processing Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: optimization,Ethylbenzene,Productivity,Alkylation,New arrangement
- چکیده:
- چکیده انگلیسی: In this paper, an industrial ethylbenzene production unit and two new reactor arrangements have been simulated and the results were compared. In most petrochemical plants, ethylene as ethylbenzene production feed is produced at steam thermal cracking units. Almost ethylene is produced excess in these plants because of changing feed rate, feed type and or shut down of any other user unit of ethylene. So finding a new application for consuming excess ethylene in these plants without designing new units is important. In this study, two new reactor arrangements have been proposed. In the first scenario, the 3rd bed of transalkylator plays alkylator role instead of transalkylator and in the second scenario, all three beds were used as a parallel reactor with current alkylator reactors. The results show that ethylbenzene productivity rises 22% and 20% in scenarios 1 and 2, respectively, compared to a commercial industrial unit. Finally, one of the effective parameters in ethylbenzene unit is the ratio of ethylene to benzene in the feed of all beds of reactors, so it was selected as decision variable and ethylbenzene productivity as the objective function of an optimization problem. All cases were optimized and results show 43% ethylbenzene productivity improvement in an optimized version of scenario2 in compared other scenarios.
- انتشار مقاله: 19-07-1397
- نویسندگان: Hossein Soltanalizadeh Maleki,Alireza Behroozsarand,Kamran Ghasemzadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Gas Processing Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: process simulation,Flare gas utilization,membrane applications,energy index,flare gas to gasoline (FGTG),energy and emissions efficiency
- چکیده:
- چکیده انگلیسی: The Gas to Gasoline (GTG) process includes conversion of natural, flare, and associated gas into synthetic fuels that can be compositionally upgraded and adjusted into different useful hydrocarbon fuels including gasoline, liquid petroleum gas (LPG), and fuel gas. Commonly, the GTG process involves three stages: 1) Synthesis gas (syngas) production unit 2) Methanol production unit 3) Methanol to Gasoline production unit (MTG). In this study, an integrated Flare Gas to Gasoline (FGTG) process for converting flare gas to gasoline, LPG and fuel gas is simulated using the Aspen HYSYS v. 8.8 simulator. The steam methane reforming (SMR) unit, the syngas to methanol unit, and the MTG unit are configured for simulation as an integrated FGTG process. In order to reduce carbon dioxide gas emissions to the atmosphere, a novel closed arrangement for the FGTG process (recycling configuration) is described and simulated. The simulation results demonstrate that by recycling all gas emissions, such as flare and off gas from the methanol and MTG units back into the process cycle, gasoline and LPG productivity can be increased on average by about 53% and 10%, respectively, compared to a base FGTG configuration that does not involve such recycling. The integrated simulation is supported by sensitivity analysis based on FGTG plants of various natural gas capacities (from 70,000 to 130,000 lb./hr.) as the adjustable (independent) variable and gasoline, LPG, and fuel gas selectivity as the dependent variables. Results of the simulation cases reveal that the total productivity of the integrated FGTG process could be increased in terms of flare gas mass flow, with the selectivity of products remaining approximately fixed for different plant capacities (i.e., at 75% for the gasoline product). Moreover, the utilities and energy consumption of the FGTG process is compared for several sensitivity cases. The results reveal that by increasing the capacity of the gas feed (natural gas mass flow) the Energy Index (i.e., total utilities consumption to product flow rate) decreased by about 8% and 47% in the base and recycling configurations, respectively. This finding suggests that an FGTG plant becomes more energy efficient at in higher-capacity plants.
- انتشار مقاله: 28-02-1397
- نویسندگان: Mostafa Jafari,Sadaf Ashtab,Alireza Behroozsarand,Kamran Ghasemzadeh,David A Wood
- مشاهده
- جایگاه : پژوهشی
- مجله: Energy Equipment and Systems
- نوع مقاله: Journal Article
- کلمات کلیدی: Flare Gases,Combined Cycle Power Plant, Simulation, Membrane Process, Assaloye
- چکیده:
- چکیده انگلیسی: In recent decades, the release of flare gases from different units of chemical industries into the atmosphere has become a substantial environmental problem all around the world. Therefore, recovery or use of flare gases has become much more critical. Combined heat and power generation from flare gases is one of the most economical methods for recovering flare gases. Two power generator gas cycle power plant or a combined cycle power plant can be used to generate heat and power. In this research, simulation and economic evaluation of heat and power generation from flare gases in a gas cycle power plant and combined cycle power plant using PRO/II v.10 software. Finally, by changing the effective operating parameters such as air to treated flare gas ratio, the outlet pressure of compressors, outlet pressure of steam and gas turbine, outlet pressure of pumps and adiabatic efficiency steam and gas turbine, heat and power generation and total capital and operating cost were investigated and analyzed. The results of simulation and sensitivity analysis showed that the use of flare gas with a mass flow rate of 9700 kg/h (mole fraction of CH4: 0. 84) could be used to construct a combined cycle power plant with a capacity of 115 MW with an investment cost of 100 M$. This value of energy surpasses the need for an average community with 85000 families, and the excess can be sold to the national grid.
- انتشار مقاله: 13-10-1399
- نویسندگان: Mostafa Jafari,Mohammad-Hosein Sarrafzadeh,Kamran Ghasemzadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Energy Equipment and Systems
- نوع مقاله: Journal Article
- کلمات کلیدی: Flare Gases,Combined Cycle Power Plant, Simulation, Membrane Process, Assaloye
- چکیده:
- چکیده انگلیسی: In recent decades, the release of flare gases from different units of chemical industries into the atmosphere has become a substantial environmental problem all around the world. Therefore, recovery or use of flare gases has become much more critical. Combined heat and power generation from flare gases is one of the most economical methods for recovering flare gases. Two power generator gas cycle power plant or a combined cycle power plant can be used to generate heat and power. In this research, simulation and economic evaluation of heat and power generation from flare gases in a gas cycle power plant and combined cycle power plant using PRO/II v.10 software. Finally, by changing the effective operating parameters such as air to treated flare gas ratio, the outlet pressure of compressors, outlet pressure of steam and gas turbine, outlet pressure of pumps and adiabatic efficiency steam and gas turbine, heat and power generation and total capital and operating cost were investigated and analyzed. The results of simulation and sensitivity analysis showed that the use of flare gas with a mass flow rate of 9700 kg/h (mole fraction of CH4: 0. 84) could be used to construct a combined cycle power plant with a capacity of 115 MW with an investment cost of 100 M$. This value of energy surpasses the need for an average community with 85000 families, and the excess can be sold to the national grid.
- انتشار مقاله: 13-10-1399
- نویسندگان: Mostafa Jafari,Mohammad-Hosein Sarrafzadeh,Kamran Ghasemzadeh
- مشاهده