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Abstract
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.
References
Regulagadda P, Dincerand I, Naterer GF. Exergy analysis of a thermal power plant with measured boiler and turbine losses. Journal of Applied thermal Engineering 2010; 30: 970-976. https://doi.org/10.1016/j.applthermaleng.2010.01.008
Bolatturk A, Coskun A, Geredelioglu C. Thermodynamic and exergoeconomics analysis of Cayirhan thermal power plant. Journal on Energy Conversion and Management. 2015; 101: 371-378. https://doi.org/10.1016/j.enconman.2015.05.072
Pokale WK. Effects of thermal power plant on Environment. Scientific Reviews and Chemical Communications 2012; 2(3): 272-275.
ArifBijaksana AM, Sjahrul M, Harun N, Djamaluddin R. The effects of gas emission steam power plant on the surrounding residential area. International Journal of Civil & Environmental Engineering IJCEE-IJENS 2012; 12(03): 1-7.
Ray TK, Datta A, Gupta A, Ganguly R. Exergy-based performance analysis for proper O&M decisions in a steam power plant. Journal on Enegy Conversion and Management 2010; 101: 1333-1344. https://doi.org/10.1016/j.enconman.2010.01.012
Utlu Z, Hepbasli A. A review on analyzing and evaluating energy utilization efficiency of countries. Renew Sustain Energy Rev. 2009; 11: 1-11. https://doi.org/10.1016/j.rser.2004.12.005
Rosen MA. Energy- and exergy- based comparison of coal-fired and nuclear steam power plants. Exergy Int J.2001; 1(3): 180-92. https://doi.org/10.1016/S1164-0235(01)00024-3
El-Wakil MM. Power Plant Technology, New York; McGraw Hill Book Company Limited.
Rosen MA. Second law analysis: approaches and implications. International Journal Energy Res. 1999; 415-429. https://doi.org/10.1002/(SICI)1099-114X(199904)23:5<415::
AID-ER489>3.0.CO;2-7
Ehyaei MA, Mozafari A, Alibiglou MH. Exergy, Economic & Environmental (3E) analysis of inlet fogging for gas turbine power plant. Energy 2011; 36: 6851-6861. https://doi.org/10.1016/j.energy.2011.10.011
Li Y, Liu L. Exergy analysis of 300MW coal-fired power plant. Energy Proc. 2012; 17: 926-932. https://doi.org/10.1016/j.egypro.2012.02.189
Ahmadi P, Dincer I, Rosen MA. Exergy, exergoeconomics and environmental analyses and volutionary algorithm based multi-objective optimization of combined cycle power plants. Energy. 2011; 36: 5886-5898. https://doi.org/10.1016/j.energy.2011.08.034
Aydin H. Exergetic sustainability analysis of LM6000 gas turbine power plant with steam cycle. Energy 2913: 57: 766-774. https://doi.org/10.1016/j.energy.2013.05.018
Ding L, Akbarzadeh A, Singh B, Remeli M. Feasibility of electrical power generation generation using thermoelectric modules via solar pond heat extraction, Energy Convers. Manage. 2017; 135: 74-83. https://doi.org/10.1016/j.enconman.2016.12.069
Elsayed I, Nishi Y. A feasibility study on power generation from solar thermal wind tower: inclusive impact assessment concerning environmental and economic costs, Energies 2018; 11(11): 3181. https://doi.org/10.3390/en11113181
Kirmani S, Jamil M, Akhtar I. Economic feasibility of hybrid energy generation with reduced carbon emission, IET Renew. Power Gen. 2018; 12(8): 934-942. https://doi.org/10.1049/iet-rpg.2017.0288
Moreno-Gamboa F, Escudero-Atehortua A, Nieto-Londono C. Performance evaluation of external fired hybrid solar gas-turbine power plant in Colombia using energy and exergy methods. Thermal Science and Engineering Progress 2020; 20: 100679. https://doi.org/10.1016/j.tsep.2020.100679
Shamoushaki M, Ehyaei MA. Optimization of Gas Turbine Power Plant by Evolutionary Algorithm; Considering exergy, economic and environmental aspects. Journal of Thermal Engineering. 2020; 6(2): Pp. 180-200. Yildiz Technical University Press, Istanbul Turkey. https://doi.org/10.18186/thermal.730250
Chart Software, Engineering Equation Solver(EES):2010 http./www.fchart.com/ees/.
Baudin M. Introduction to Scilab. Consortium SCILAB. cedex, Frannce. 2011 Available online at http:// forge.scilab.org/index.php/p/docintroscilab/.
Erdem HH, Akkaya AV, Cetin B, Dagdas A, Sevilgen SH, Sahin B, et al. Comparative energetic and exergetic performance analyses for coal-fired thermal power plants in Turkey. International Journal of Thermal Sciences. 2009; xxx 1- 8. https://doi.org/10.1016/j.ijthermalsci.2009.03.007
Moran MJ, Shapiro HN. Fundamentals of Engineering Thermodynamics, UK; John Wiley and sons Inc; 2006.
Utgikar PS, Dubey SP, PrasadaRoa PJ. Thermo economic analysis of gas turbine cogeneration plant- a case study. Part A: Journal of Power and Energy. (IMechE). 1995. https://doi.org/10.1243/PIME_PROC_1995_209_008_02
Bejan A, Tsatsaronis G, Moran MJ. Thermal Design and Optimization, UK; John Wiley and sons Inc; 1995.
Ahmadi GR, Toghraie D. Energy and exergy analysis of Montazeri steam Power Plant in Iran. Renewable and Sustainable Energy Reviews 2016; 56: 454-463. https://doi.org/10.1016/j.rser.2015.11.074
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