In this paper, feed water heating repowering of Shahid Montazeri steam power plant has been studi... more In this paper, feed water heating repowering of Shahid Montazeri steam power plant has been studied in three different modes. Efficiencies of energy and exergy have been selected as objective functions. Cycle-tempo software was used for simulations. In the first case, a low pressure heat recovery heat exchanger and a EGT-RLM600-PC gas turbine were used. Efficiencies of energy and exergy increase to 3.8% & 3.79% respectively and cooling tower water temperature difference increases to 0.652oC. In the second case, a high pressure heat recovery heat exchanger and a Siemens (KWU) V64.3 gas turbine were used. Efficiencies of energy and exergy increase to 6.68% and 6.65% respectively. In the third case, both heat recovery heat exchangers are and Westinghouse-401 gas turbines were used. Efficiencies of energy and exergy increase to 8.93% & 9.05% respectively. This is the best plan in terms of efficiency and cycle power promotion.
In this study, heat transfer and airfield around a parabolic trough solar collector are simulated... more In this study, heat transfer and airfield around a parabolic trough solar collector are simulated. The effect of the pitch angle, two-axis tracking system, and wind speed on the collector thermal performance is evaluated. Three-dimensional and turbulent flow equations are used. Simulations are performed at noon, for the 45th day of summer, for the geographical location of Isfahan. The effects of wind velocities from V = 1 to 3 m/s are studied. The results of this study are investigated for a single-axis tracking system at pitch angles 0°, 15°, 30°, and 45°, and for a two-axis tracking system for the angles of 45°–35°, 45°–25°, and 45°–15°, respectively. The results indicate that factors such as the change in the heat transfer coefficient, collector pitch angles, and amount of flow deviation between the upper and lower dome of the collector resulting in a distinction between the absorption of maximum radiation fluxes or the maximum heat transfer (heat loss) rate. Moreover, the higher the pitch angle, the higher the amount of received sunlight, but on the other hand, it causes the wind to affect all the collector surfaces (more heat loss). The drag force applied to the two-axis collector is lower than the one-axis collector. Therefore, using a two-axis system not only does not increase the structure size but also can decrease it, too.
In the present study, a power plant design was first carried out using thermo flow software. Ener... more In the present study, a power plant design was first carried out using thermo flow software. Energy, exergy, economic, environmental, and economic (4E) analyses were carried out to supply 50 MW solar power. Using solar energy throughout the year, the amount of reducing atmospheric pollutants, reducing the consumption of fossil fuels, reducing the cost of electricity production, the amount of energy produced and exergy, the amount of exergy destruction, the rate of application and efficiency of the power plant have been obtained. Finally, the proposed cycle is optimized multi-objectively, using genetic algorithm in MATLAB. The results show that the use of solar power plants significantly reduces atmospheric pollutants by 1,559,990.6 tons per year, reducing fossil fuel consumption by 47,143.9 tons per year, and significantly reducing energy consumption despite the low cost of energy carriers in Iran. Also, according to the results, the central regions of Iran are much more suitable for the construction of the power plant, which can generate annual sales of 37,356,480$ per year. The use of solar energy increases the relative cost of the project to significantly reduce the amount of fuel consumed, which ultimately includes a faster return on investment. Finally, it can be argued that the use of the solar thermal power plant is justified from energy, exergy, economic, and environmental. It should be noted that the increase of ηisen,ST\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\eta_{{\text{isen,ST}}}$$\end{document} will require an increase in initial investment to use higher technologies in the turbine, so increasing the level of equipment technology to increase efficiency to 88% is reasonable and will not be more than that.
Currently, fossil fuel power plants generate about 93.2% of Iran's electricity network. Negat... more Currently, fossil fuel power plants generate about 93.2% of Iran's electricity network. Negative growth of average efficiency of thermal power plants in the past years necessitates investment and research in order to increase their efficiency. In this paper, the use of solar thermal energy for parallel feed water heating repowering of Isfahan Mohammad Montazeri power plant units is evaluated. To this end, seven separate plans are proposed. At the time of replacing all high-pressure feed water heaters with solar collectors, net energy and exergy efficiencies increased by 9.5% compared to the simple cycle reaching 35.21% and 36.85%, respectively.
This paper aims at investigating steam cycle of Shahid Montazeri Power Plant of Isfahan with indi... more This paper aims at investigating steam cycle of Shahid Montazeri Power Plant of Isfahan with individual unit capacity of 200MW. Using mass, energy, and exergy balance equations, all cycle equipment have been analyzed individually and energy efficiency, exergy efficiency, and irreversibility has been calculated for each of them as required. EES (Engineering Equation Solver) software is used for performing analyses. Values and ratios regarding heat drop and exergy loss have been presented for each equipment in individual tables. The results from the energy analysis show that 69.8% of the total lost energy in the cycle occurs in the condenser as the main equipment wasting energy, while exergy analysis introduces the boiler as the main equipment wasting exergy where 85.66% of the total exergy entering the cycle is lost.
Currently, fossil fuel power plants generate about 93.2% of Iran's electricity network. Negative ... more Currently, fossil fuel power plants generate about 93.2% of Iran's electricity network. Negative growth of average efficiency of thermal power plants in the past years necessitates investment and research in order to increase their efficiency. In this paper, the use of solar thermal energy for parallel feed water heating repowering of Isfahan Mohammad Montazeri power plant units is evaluated. To this end, seven separate plans are proposed. At the time of replacing all high-pressure feed water heaters with solar collectors, net energy and exergy efficiencies increased by 9.5% compared to the simple cycle reaching 35.21% and 36.85%, respectively.
In this paper, feed water heating repowering of Shahid Montazeri steam power plant has been studi... more In this paper, feed water heating repowering of Shahid Montazeri steam power plant has been studied in three different modes. Efficiencies of energy and exergy have been selected as objective functions. Cycle-tempo software was used for simulations. In the first case, a low pressure heat recovery heat exchanger and a EGT-RLM600-PC gas turbine were used. Efficiencies of energy and exergy increase to 3.8% & 3.79% respectively and cooling tower water temperature difference increases to 0.652oC. In the second case, a high pressure heat recovery heat exchanger and a Siemens (KWU) V64.3 gas turbine were used. Efficiencies of energy and exergy increase to 6.68% and 6.65% respectively. In the third case, both heat recovery heat exchangers are and Westinghouse-401 gas turbines were used. Efficiencies of energy and exergy increase to 8.93% & 9.05% respectively. This is the best plan in terms of efficiency and cycle power promotion.
In this study, heat transfer and airfield around a parabolic trough solar collector are simulated... more In this study, heat transfer and airfield around a parabolic trough solar collector are simulated. The effect of the pitch angle, two-axis tracking system, and wind speed on the collector thermal performance is evaluated. Three-dimensional and turbulent flow equations are used. Simulations are performed at noon, for the 45th day of summer, for the geographical location of Isfahan. The effects of wind velocities from V = 1 to 3 m/s are studied. The results of this study are investigated for a single-axis tracking system at pitch angles 0°, 15°, 30°, and 45°, and for a two-axis tracking system for the angles of 45°–35°, 45°–25°, and 45°–15°, respectively. The results indicate that factors such as the change in the heat transfer coefficient, collector pitch angles, and amount of flow deviation between the upper and lower dome of the collector resulting in a distinction between the absorption of maximum radiation fluxes or the maximum heat transfer (heat loss) rate. Moreover, the higher the pitch angle, the higher the amount of received sunlight, but on the other hand, it causes the wind to affect all the collector surfaces (more heat loss). The drag force applied to the two-axis collector is lower than the one-axis collector. Therefore, using a two-axis system not only does not increase the structure size but also can decrease it, too.
In the present study, a power plant design was first carried out using thermo flow software. Ener... more In the present study, a power plant design was first carried out using thermo flow software. Energy, exergy, economic, environmental, and economic (4E) analyses were carried out to supply 50 MW solar power. Using solar energy throughout the year, the amount of reducing atmospheric pollutants, reducing the consumption of fossil fuels, reducing the cost of electricity production, the amount of energy produced and exergy, the amount of exergy destruction, the rate of application and efficiency of the power plant have been obtained. Finally, the proposed cycle is optimized multi-objectively, using genetic algorithm in MATLAB. The results show that the use of solar power plants significantly reduces atmospheric pollutants by 1,559,990.6 tons per year, reducing fossil fuel consumption by 47,143.9 tons per year, and significantly reducing energy consumption despite the low cost of energy carriers in Iran. Also, according to the results, the central regions of Iran are much more suitable for the construction of the power plant, which can generate annual sales of 37,356,480$ per year. The use of solar energy increases the relative cost of the project to significantly reduce the amount of fuel consumed, which ultimately includes a faster return on investment. Finally, it can be argued that the use of the solar thermal power plant is justified from energy, exergy, economic, and environmental. It should be noted that the increase of ηisen,ST\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\eta_{{\text{isen,ST}}}$$\end{document} will require an increase in initial investment to use higher technologies in the turbine, so increasing the level of equipment technology to increase efficiency to 88% is reasonable and will not be more than that.
Currently, fossil fuel power plants generate about 93.2% of Iran's electricity network. Negat... more Currently, fossil fuel power plants generate about 93.2% of Iran's electricity network. Negative growth of average efficiency of thermal power plants in the past years necessitates investment and research in order to increase their efficiency. In this paper, the use of solar thermal energy for parallel feed water heating repowering of Isfahan Mohammad Montazeri power plant units is evaluated. To this end, seven separate plans are proposed. At the time of replacing all high-pressure feed water heaters with solar collectors, net energy and exergy efficiencies increased by 9.5% compared to the simple cycle reaching 35.21% and 36.85%, respectively.
This paper aims at investigating steam cycle of Shahid Montazeri Power Plant of Isfahan with indi... more This paper aims at investigating steam cycle of Shahid Montazeri Power Plant of Isfahan with individual unit capacity of 200MW. Using mass, energy, and exergy balance equations, all cycle equipment have been analyzed individually and energy efficiency, exergy efficiency, and irreversibility has been calculated for each of them as required. EES (Engineering Equation Solver) software is used for performing analyses. Values and ratios regarding heat drop and exergy loss have been presented for each equipment in individual tables. The results from the energy analysis show that 69.8% of the total lost energy in the cycle occurs in the condenser as the main equipment wasting energy, while exergy analysis introduces the boiler as the main equipment wasting exergy where 85.66% of the total exergy entering the cycle is lost.
Currently, fossil fuel power plants generate about 93.2% of Iran's electricity network. Negative ... more Currently, fossil fuel power plants generate about 93.2% of Iran's electricity network. Negative growth of average efficiency of thermal power plants in the past years necessitates investment and research in order to increase their efficiency. In this paper, the use of solar thermal energy for parallel feed water heating repowering of Isfahan Mohammad Montazeri power plant units is evaluated. To this end, seven separate plans are proposed. At the time of replacing all high-pressure feed water heaters with solar collectors, net energy and exergy efficiencies increased by 9.5% compared to the simple cycle reaching 35.21% and 36.85%, respectively.
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