Indian Journal of Science and Technology

Open Access Open Access  Restricted Access Subscription Access

Boiler Parametric Study to Decrease Irreversibility


Affiliations
1 Department of Mechanics, Behbahan Branch, Islamic Azad University, Behbahan, Iran, Islamic Republic of
2 Department of Mechanics, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran, Islamic Republic of
 

In this paper, the useful concept of energy and exergy utilization is analyzed, and applied to the boiler system. Energy and exergy flows in a boiler have been shown in this paper. The energy and exergy efficiencies have been determined as well. In a boiler, the energy and exergy efficiencies are found to be 89.21% and 45.48%, respectively. A boiler energy and exergy efficiencies are compared with others work as well. It has been found that the combustion chamber is the major contributor for exergy destruction followed by heat exchanger of a boiler system. Furthermore, Modifications are examined to increase gas-fired steam power plant efficiency by reducing irreversibilities in the steam generator, including Decreasing the fraction of excess combustion air, and/or the stack-gas temperature. Overall-plant energy and exergy efficiencies both increase by 0.19%, 0.37% respectively when the fraction of excess combustion air decreases from 0.4 to 0.15, and by 0.84%, 2.3% when the stack-gas temperature decreases from 137°C to 90°C

Keywords

Exergy Efficiency, Energy Efficiency, Super Critical Thermal Power Plant, Excess Air, Stack Gas Temperature
User

  • Cihan A, HacıhafızogluO and Kahveci K (2006) Energy-exergy analysis and modernization suggestions for a combined-cycle power plant. Int. J. Energy Res. 30, 115–126.

  • Dincer I and Al-Muslim H (2001) Thermodynamic analysis of reheat cycle steam power plants. Int.J. Energy Res. 25, 727-739.

  • ERC (2004) In: How to save energy and money in boilers and furnace systems. Energy Res. Centre (ERC), University of Cape Town, South Africa.

  • Gallow LR and Milanez LF (1990) Choice of a reference state for exergetic analysis. Energy. 15, 113–121.

  • Habib MA and Zubair SM (1992) Second-law-based thermodynamic analysis of regenerative-reheat Rankine cycle power plants. Energy. 17, 295–301.

  • Jayamaha and LalIn (2008) Energy efficient building systems. Hardbook. Mcgraw Hill Education, Europe.

  • Song TW, Kim JL, Kim TS and Roa T (2002) Exergybased performance analysis of the heavy-duty gas turbine in part-load operating conditions. Exergy. 2 (20),105–112.

  • Sonia Yeh, Edward S and Rubin (2008) A centurial history of technological change and learning curves for pulverized coal-fired utility boilers. Energy. 3, 1996– 2005.


Abstract Views: 3734

PDF Views: 141




  • Boiler Parametric Study to Decrease Irreversibility

Abstract Views: 3734  |  PDF Views: 141

Authors

Mehdi Bakhshesh
Department of Mechanics, Behbahan Branch, Islamic Azad University, Behbahan, Iran, Islamic Republic of
Amir Vosough
Department of Mechanics, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran, Islamic Republic of

Abstract


In this paper, the useful concept of energy and exergy utilization is analyzed, and applied to the boiler system. Energy and exergy flows in a boiler have been shown in this paper. The energy and exergy efficiencies have been determined as well. In a boiler, the energy and exergy efficiencies are found to be 89.21% and 45.48%, respectively. A boiler energy and exergy efficiencies are compared with others work as well. It has been found that the combustion chamber is the major contributor for exergy destruction followed by heat exchanger of a boiler system. Furthermore, Modifications are examined to increase gas-fired steam power plant efficiency by reducing irreversibilities in the steam generator, including Decreasing the fraction of excess combustion air, and/or the stack-gas temperature. Overall-plant energy and exergy efficiencies both increase by 0.19%, 0.37% respectively when the fraction of excess combustion air decreases from 0.4 to 0.15, and by 0.84%, 2.3% when the stack-gas temperature decreases from 137°C to 90°C

Keywords


Exergy Efficiency, Energy Efficiency, Super Critical Thermal Power Plant, Excess Air, Stack Gas Temperature

References





DOI: https://doi.org/10.17485/ijst%2F2012%2Fv5i4%2F30421