Thermodynamic (Energy-Exergy) Analysis Of Nine MW Coal Based Thermal Power Plant Using Entropy Generation Principle (original) (raw)

Energy and Exergy Analysis of Coal Fired Power Plant

2015

The global trend of growing energy demand, accompanied by the dependency on fossil fuels and their impacts, provokes continuous interests for analyzing equipment efficiency and revision of existing energy production sites. This paper focuses on thermodynamic analysys of a coal-fired power plant "Kolubara - block A5", with respect to the concept of energy losses, production of entropy and exergy destruction.Most significant energy losses occur in the condenser where they are lost to the environment, whereas greatest exergy destruction is found in the boiler. The results of energy and exergy performance of the plant are calculated for maximum load and 75% of the maximum load. Each of the system components is modeled as a "black box", and the energy and exergy balances are determined according to operation data. Thermal efficiency, based on the specific heat input to the steam, was calculated and found to be 32.1% and 33.1%, while the exergy efficiency of the power ...

Energy and exergy analysis of a coal based thermal power plant

6th BSME International Conference on Thermal Engineering (ICTE 2014), 2014

This paper addresses the energetic and exergetic efficiencies and losses in different components and the overall system of a 250 MW coal based thermal power plant. The plant is operated under Bangladesh Power Development Board (BPDB), which is located at Barapukuria, Bangladesh and consists of 2 units (2 x 125 MW). The analyses have been carried out by considering design data for different designed and loading conditions of the plant. The overall energy efficiencies of the plant are 35.48%, 56.77%, 70.96% and 75.67% and the overall exergy efficiencies were 44.25%, 33.31%, 30.78 % and 30.21% for 50%, 80%, 100% and 106% loading conditions respectively for the design data. However, the overall energy and exergy efficiencies of the power plant during operation are 39.2%, 46.6% and 27.9 %, 27.2% for 57% and 67% loading conditions respectively, which are lower than the design value. The distribution of the exergy losses in power plant components has been assessed to locate the process irreversibility. The comparison between the energy losses and the exergy losses of the individual components of the plant shows that the maximum energy losses (~49.92%) occur in the condenser, whereas the maximum exergy losses (~68.27%) occur in the boiler. Exergy analysis can be particularly effective in identifying ways to optimize the performance of existing operations and designing the plant while energy balance gives heat transfer between the system and its surrounding.

ENERGY AND EXERGY ANALYSIS FOR PERFORMANCE IMPROVEMENT OF COAL FIRED THERMAL POWER PLANT

Steadily growing demand of power and heavily dependence on conventional sources like coal and gas for power generation has made it imperative to utilize these resources efficiently and economically. The conventional steam power plant designs are normally based on the energetic performance of plant components viz. boiler, turbine etc. First law based energetic performance analysis is not sufficient to know about the complete utilization of energy as it does not provide any information regarding quality degradation during transformation process. In this research paper concept of exergetic performance analysis i.e. application of first and second law of thermodynamics together, has been utilized to identity the location/components where major energy and exergy losses takes place and also to determine the extent of losses. In the present study complete first and second law analysis of a 250MW coal fired thermal power plant at Korba, Chhattisgarh, India, is carried out at three different loads. The energy and exergy efficiency of the components have been determined. The energy efficiency of the plant is found to be 38.5%, 37.54% and 34.63% respectively for the plant operation at 250MW, 200MW and 125MW. A similar trend is seen in exergetic performance and exergy efficiency is recorded as 36.32%, 34.41% and 32.67% respectively at three loads mentioned above. It is observed that at the full load of 250MW the maximum energy loss (46.26% of the input) among all the components is taking place in the condenser which is the 72.46% of total energy loss whereas the maximum exergy loss of around 50% of the input takes place in the boiler and this contributes to 76.67% of total exergy loss. Both on the basis of quantity and percent exergy loss, boiler is the key component showing huge potential for saving. This study suggests that the possible measures should be taken to avoid the quality degradation of energy in boiler i.e. in the zone of higher temperature gradient and operation of the plant closed to the full load should be ensured for better performance.

IJERT-Energy and Exergy Analysis of Coal Fired Cogeneration Power Plant

International Journal of Engineering Research and Technology (IJERT), 2014

https://www.ijert.org/energy-and-exergy-analysis-of-coal-fired-cogeneration-power-plant https://www.ijert.org/research/energy-and-exergy-analysis-of-coal-fired-cogeneration-power-plant-IJERTV3IS20737.pdf In this paper an energy and exergy analysis of cogeneration power plant is presented. Most of the power plants are designed by an energetic performance criteria based on first law of thermodynamics only it gives an amount of energy inlet and outlet but it does not specify the quantity of energy losses in an environment. Real use of energy can justified by second law of thermodynamics which gives quality and quantity of energy at inlet and outlet. In this study an energy and exergy analysis of different components of coal based power plant is carried out and found out that and energy and exergy efficiency of boiler is 84.38% and 58.50% respectively.

Energy and Exergy Analysis of a Coal Fired Thermal Power Plant with Varying Load Conditions

Journal of Scientific and Engineering Research , 201 7 , 4 ( 7 ): 2 15 - 2 29, 2017

This article aims to identify the energetic and exergetic efficiencies and the losses in different components of a 250 MW coal based thermal power plant. The analysis has been carried out by considering the design data as well as the operational data at varying load conditions. The distribution of the exergy losses in power plant components has been assessed to locate the process irreversibility. Basically, the power plants are designed based on first law of thermodynamics that does not afford to calculate useful energy losses of the system due to the quality and quantity of energy difference. This study deals with the comparison of energy and exergy analyses of the Barapukuria coal fired thermal power plant of Bangladesh, which deals with both first and second law of thermodynamics. Operation and maintenance decisions based on exergy analysis (second law analysis) would be more effective for operation of the thermal power plant.

International Conference on Thermal Engineering ( ICTE 2014 ) Energy and exergy analysis of a coal based thermal power plant

2014

This paper addresses the energetic and exergetic efficiencies and losses in different components and the overall system of a 250 MW coal based thermal power plant. The plant is operated under Bangladesh Power Development Board (BPDB), which is located at Barapukuria, Bangladesh and consists of 2 units (2 x 125 MW). The analyses have been carried out by considering design data for different designed and loading conditions of the plant. The overall energy efficiencies of the plant are 35.48%, 56.77%, 70.96% and 75.67% and the overall exergy efficiencies were 44.25%, 33.31%, 30.78 % and 30.21% for 50%, 80%, 100% and 106% loading conditions respectively for the design data. However, the overall energy and exergy efficiencies of the power plant during operation are 39.2%, 46.6% and 27.9 %, 27.2% for 57% and 67% loading conditions respectively, which are lower than the design value. The distribution of the exergy losses in power plant components has been assessed to locate the process irr...

Energy and Exergy Analysis of a Coal Fired Power Plant

October 2018, 2018

In this paper, energy and exergy analysis has been conducted on a subcritical coal fired power plant of Wisconsin Power and Light Company, USA to investigate the steam cycle energy and exergy efficiency. The cycle is analyzed by developing a mathematical model using its operating and design parameters. The analysis is performed using EES (Engineering Equation Solver). The energy analysis shows that major share of energy loss occurs in condenser i.e. 72% of total cycle energy loss, whereas, exergy analysis shows that 83.09% total exergy destruction of cycle occurs in boiler.Furthermore, the simulation results are compared with actual with an absolute error of 3.1%. Additionally, the parametric study is performed to examine the effects of various operating parameters such as main steam pressure and temperature, condenser pressure, terminal and drain cooler temperature difference on net power output, energy andexergy efficiency of cycle. The parametric study shows that the plant has ma...

Exergy Analysis of Coal-Based 2 X 7 MW Steam Power Plant

International Journal of Electrical, Energy and Power System Engineering

In this study, an analysis was conducted on a steam power plant system with a capacity of 2 x 7 MW based on coal. The coal fuel used by the majority of refined sizes is not in accordance with the recommendations of the American Society of Mechanical Engineers (ASME). The main objective of the study was to analyze the system components separately and to measure the exergy value of the components, covering the electrical energy so that it is known which equipment experiences the greatest energy loss as well as knowing the efficiency value of the equipment used. Efficiency and exergy are calculated using plant operation data. The results of the study found that the largest exergy destruction occurred in boilers, meaning that there was the largest energy loss in this section with a value of 37.34 MW (16.71%), while the destruction of the smallest exergy occurred in condensers of 0.58 MW (99.24%).

Energy and exergy analyses of thermal power plants: A review

Renewable & Sustainable Energy Reviews, 2011

The energy supply to demand narrowing down day by day around the world, the growing demand of power has made the power plants of scientific interest, but most of the power plants are designed by the energetic performance criteria based on first law of thermodynamics only. The real useful energy loss cannot be justified by the fist law of thermodynamics, because it does not differentiate between the quality and quantity of energy. The present study deals with the comparison of energy and exergy analyses of thermal power plants stimulated by coal and gas. This article provides a detailed review of different studies on thermal power plants over the years. This review would also throw light on the scope for further research and recommendations for improvement in the existing thermal power plants.