scholarly journals Exergy and Environmental Assessment of a Steam Power Plant

2020 ◽  
Vol 7 ◽  
pp. 31-47
Author(s):  
M.N. Eke ◽  
D.C. Onyejekwe ◽  
O.V. Ekechukwu ◽  
C.C. Maduabuchi
Keyword(s):  
Power Plant ◽  
Environmental Pollution ◽  
Environmental Effect ◽  
Inlet Temperature ◽  
Exergy Destruction ◽  
High Pressure Turbine ◽  
Steam Power ◽  
Effect Factor ◽  
Sustainability Index ◽  
Steam Power Plant

Many electricity generating stations are concerned with the reduction of environmental pollution associated with the thermodynamic activities of power plants. Such environmental pollution includes emissions from exhaust gases, cooling tower blowdown, boiler blowdown and demineralization. In this paper, an exergo-environmental analysis was conducted using design data from the Egbin power plant for a 220MW steam power plant. Enhancement was carried out on the plant under varying pressure and temperature conditions to assess the plant’s performance improvements that would lead to more reduction in environmental pollution. The exergy destruction efficiency value indicates that the boiler sub- system gave the highest exergy destruction in the power plant. Also, sustainability indicators such as environmental effect factor, waste exergy ratio and sustainability index factors have been performed and results presented with respect to the plant. The improvement options considered were: (i) increasing the inlet temperature of the high-pressure turbine at constant boiler pressure, and (ii) the second approach, simultaneous increase in inlet temperature of high-pressure turbine and boiler pressure. The result showed that the second improvement approach gave a better improvement approach than the former by reducing the environmental effect factor by 17.32% and increasing the sustainability index factor by 21.54%. These effects ultimately reduced the steam power plant emissions and improved efficient fuel utilization by the plant for sustainable development and for more power production.

Exergoeconomic Analysis of a Steam Power Plant in Iran

2011 ◽  
Vol 110-116 ◽  
pp. 3465-3470 ◽  
Author(s):  
A. Dehghanipour ◽  
H. Ajam
Keyword(s):  
Power Plant ◽  
Ambient Temperature ◽  
Exergy Destruction ◽  
Steam Power ◽  
Load Variations ◽  
Destruction Rate ◽  
Steam Power Plant ◽  
Low Pressure Turbine ◽  
Exergoeconomic Analysis ◽  
Increasing Load

The exergy and exergoeconomic of the Qazvin steam power plant carried out here. In this paper the exergy destruction and efficiency of each component of this power plant is estimated. Since in every power plant there are different working loads and ambient temperature is varying during seasons, the effect of the load variations and the ambient temperature on the exergy analysis of power plant are calculated in order to obtain a good insight into this analysis. According the results, the boiler has the highest exergy destruction rate. The variation of the ambient temperature, is at the range 5ºc to 30ºc. Increasing the ambient temperature, the exergy destruction rate of all components increased. Increasing load of the power plant from 125 MW to 263 MW increases exergy efficiency of boiler and turbine. Then exergoeconomic analysis is done. The results show that the boiler has the highest cost of exergy destruction. Economic factors including the relative cost difference (rk) and exergoeconomic factor (fk), are calculated for each component. According to the results, the boiler, the low pressure turbine and the condenser of Qazvin power plant, are major exergy destructors respectively.

scholarly journals Energy and Exergy Analysis of a Steam Power Plant in Suda

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Osman Shamet ◽  
Rana Ahmed ◽  
Kamal Nasreldin Abdalla
Keyword(s):  
Power Plant ◽  
Energy Loss ◽  
Heat Loss ◽  
Exergy Analysis ◽  
Primary Objective ◽  
Exergy Destruction ◽  
Steam Power ◽  
Steam Power Plant ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

In this study, the energy and exergy analysis of Garri 4 power plant in Sudan is presented. The primary objective of this paper is to identify the major source of irreversibilities in the cycle. The equipment of the power plant has been analyzed individually. Values regarding heat loss and exergy destruction have been presented for each equipment. The results confirmed that the condenser was the main source for energy loss (about 67%), while ex­ergy analysis revealed that the boiler contributed to the largest percentage of exergy destruction (about 84.36%) which can be reduced by preheating the inlet water to a sufficient temperature and controlling air to fuel ratio.

Comparison of Combined Cycle and Conventional Steam Power Plant Through Energy Level and Thermoeconomic Analysis

2008 ◽  
Author(s):  
Mohammad Hasan Khoshgoftar Manesh ◽  
Majid Amidpour ◽  
Hasan Khodaei Jalal Abadi
Keyword(s):  
Power Plant ◽  
Computer Program ◽  
Exergy Analysis ◽  
Combined Cycle ◽  
Operating Conditions ◽  
Plant Performance ◽  
Exergy Destruction ◽  
Steam Power ◽  
Steam Power Plant ◽  
Exergoeconomic Analysis

Exergy, exergoeconomic and combined pinch and exergy analysis are beneficial methods that can be applied for design or performance evaluation of process systems or thermal power plants; however, these methods are usually applied individually. In this paper, these methods have been applied for 423 MW NEKA combined cycle power plant located in NEKA at north of Iran and 315-MW RAMIN steam power plant located in Ahvaz at south of Iran as real cases to evaluation and comparison of performance of each component in different load conditions simultaneously. To perform these analysis for both plants, a computer program is developed from thermodynamic modeling of the plant as simulator. With the thermodynamic properties of the most significant mass and energy flow stream being obtained from the plant, the simulator can reproduce the cycle behavior for different operating conditions with relative errors less than 4.2%. The models of computer program are refined using data from designed performance test in these plants. After thermodynamic simulation, this program can calculate exergy of the flows. In addition, it can perform exergoeconomic analysis using thermoeconomic model of both plants that are defined based on the functionally of each component by the fuel-product definition. The costs of all flows in production structure can be calculated by solving a set equation including thermoeconomic modeling of each plant. Furthermore, it is helpful to display the system information graphically for one to visualize the performance of system in different conditions by applying combined pinch-exergy analysis. Meanwhile, due to importance of exergy destruction cost and better understanding plant performance, the new variables have been defined as Exergy Destruction Level (EDL) and Exergy Cost Destruction Level (ECDL). In this respect, new graphical representation has been developed for showing performance of each component based on exergoeconomic analysis. In this regard, this computer program can generate improved combined pinch-exergy and EDL/ ECDL representation.

New Graphical Methodology for Energy Integration in Nuclear Steam Power Plant

2008 ◽  
Author(s):  
Mohammad Hasan Khoshgoftar Manesh ◽  
Majid Amidpour
Keyword(s):  
Power Plant ◽  
Energy Level ◽  
Graphical Representation ◽  
Base Case ◽  
Exergy Destruction ◽  
Energy Integration ◽  
Steam Power ◽  
Steam Power Plant ◽  
Integration Schemes ◽  
Level Analysis

Exergy concept combined with pinch based approach is used for studying the optimal integration of energy conversion systems. The analysis first considers the representation of the hot and cold composite curves of the process and defines the energy and the exergy requirements. Strength of pinch analysis is that system information can be represented using simple diagrams and thus targets for the system under consideration can be readily obtained prior to design. In contrast, the power of exergy analysis is that it can identify the major causes of thermodynamic imperfection of thermal and chemical processes and thus promising modifications can be determined effectively. By combining the strengths of both methods, the proposed method can represent a whole system, including individual units on one diagram, which helps to screen the promising modifications quickly for improving a base case design. This method is Energy Level Analysis. We have developed energy level analysis to energy destruction level as a strategy for energy integration that uses power plant simulation tools to define the interaction between the various subsystems in the plant and a graphical technique to help the engineer interpret the results of the simulation with physical insights that point towards exploring possible integration schemes to increase energy efficiency. In this paper, 1000 MW nuclear steam power plant similar to Bushehr is considered. Simulation of power plant is performed in STEAM PRO software. Computer code is developed to exergy calculation and generation of exergy destruction level representation. In addition, thermoeconomic analysis is performed to generation of other new graphical representation related to exergy destruction that helps us to consider cost rate of destruction in each component.

scholarly journals Analisa Eksergi PLTU Berbahan Bakar Sampah Padat Kota Kapasitas 600 Ton per Hari

2019 ◽  
Vol 20 (2) ◽  
pp. 251
Author(s):  
Amiral Aziz
Keyword(s):  
Power Plant ◽  
Solid Waste ◽  
Electrical Energy ◽  
Exergy Efficiency ◽  
Exergy Destruction ◽  
Turbine Generator ◽  
Co2 Emission Reduction ◽  
Steam Power ◽  
Steam Power Plant ◽  
Exergy Losses

ABSTRACTExergy analysis was conducted in evaluating the performance of Muncipal Solid Waste Fired Steam Power Plant (PLTSa) to determine the locations and quantities of exergy losses. Wastes and exergy destructions in different processes of the plant were also been calculated. Total exergy available at incinerator input was 60.560,54 kW, consisted of 58.242,45 kW in MSW and 2.318,08 kW in the combustion air. The burning of 600 ton per day MSW in the PLTSa produced 8.482,83 kW Net Electric Power, accounted for 14,01 % of the overall exergy efficiency of the power plant. The plant produced electrical energy 59.447.673 kWh/year and reduced 240.900 ton MSW/year, thus contributing to CO2 emission reduction. Exergy efficiency of the turbine generator and condenser were 86,21 % and  78,48 % respectively. PLTSa component with the largest exergy destructions was incinerator-boiler (56,53 %), far exceeded the turbine generator (8,69 %), and condenser (3,79 %).Keywords: Exergy, Exergy Destruction, Steam Power Plant, Muncipal Solid Waste  (MSW), Exergy Efficiency.ABSTRAKPentingnya analisa eksergi dalam mengevaluasi kinerja PLTSa telah terbukti. Analisa eksergi PLTSa telah dilakukan untuk mengetahui lokasi dan jumlah kerugian eksergi. Limbah dan destruksi eksergi dalam proses yang berbeda telah diindikasikan. Hasil yang diperoleh menunjukkan bahwa total eksergi yang tersedia pada input Incenerator adalah 60560,54 kW. Nilai ini terdiri dari 58242,45 kW yang terkandung dalam MSW dan 2318,08 kW dalam udara pembakaran. Pembakaran 600 ton per hari MSW pada sistem PLTSa menghasilkan  8482,83 kW daya listrik bersih dan 14,01 % efisiensi eksergi keseluruhan pembangkit. Pembangkit menghaslkan energi listrik sebesar 59447673 kWh/tahun dan mengurangi timbunan sampah sebanyak 240900 ton MSW/tahun, sehingga berkontribusi dalam mengurangi emisi CO2. Efisiensi eksergi dari sistem turbin generator dan sistem kondensor masing-masing adalah 86,21 % dan  78,48 %. Komponen PLTSa dimana terjadi destruksi eksergi yang terbesar berturut-turut adalah pada sistem Insinerator-boiler sebesar 56,53 % , sistem turbine - generator 8,69% dan sistem kondensor 3,79%.Kata kuncis: Eksergi, Destruksi Eksergi,  PLTUSa, Sampah Padat Kota (MSW), Efisiensi Eksergi

Cracks on the Roots of Turbine Blades of the Low-Pressure Turbine in a Steam Power Plant

2015 ◽  
Vol 52 (4) ◽  
pp. 214-225 ◽  
Author(s):  
E. Plesiutschnig ◽  
R. Vallant ◽  
G. Stöfan ◽  
C. Sommitsch ◽  
M. Mayr ◽  
...  
Keyword(s):  
Power Plant ◽  
Turbine Blades ◽  
Low Pressure ◽  
Steam Power ◽  
Steam Power Plant ◽  
Low Pressure Turbine
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