Assessment of thermodynamic irreversibility in different zones of a heavy fuel oil fired high pressure boiler

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• 作者：Omendra Kumar Singh
• 关键词：Net calorific value ; Standard chemical exergy ; Heavy fuel oil ; Boiler ; Irreversibility
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：123
• 期：1
• 页码：829-840
• 全文大小：766 KB
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• 作者单位：Omendra Kumar Singh (1)
  
  1. Department of Mechanical and Automation Engineering, Indira Gandhi Delhi Technical University for Women, Delhi, 110006, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

This paper presents a comprehensive second law-based thermodynamic analysis of a heavy oil-fired high-pressure boiler used in a steam power plant. The entire boiler region is divided into four zones to determine the magnitudes of energy loss and irreversibility taking place in these zones so that measures may be taken to reduce them. The energy analysis reveals that the maximum loss of combustion energy of the fuel takes place in the last zone where the exhaust gasses leave the chimney and taken away by these gases, whereas the exergy analysis reveals that the irreversibility rate in the first zone, i.e., furnace region, is the highest as compared to that in other zones. In this zone, 29.26 % of the fuel exergy is destroyed, while the energy loss is zero. In the chimney zone, where the energy loss is the maximum, the exergy destruction is just 4.64 %. Therefore, the real loss is actually taking place in the boiler furnace due to the generation of entropy. The chemical reactions between the fuel and air are the main cause of irreversibility. Decreasing either the percentage of excess combustion air or the exhaust gas temperature or both will cause the irreversibility rate in the furnace to decrease.