Improving steam power plant efficiency through exergy analysis: effects of altering excess combustion air and stack-gas temperature

被引：34
|
作者：
Rosen, Marc A. [1 ]
Tang, Raymond [2 ]
机构：
[1] Univ Ontario, Inst Technol, Fac Engn & Appl Sci, Oshawa, ON L1H 7L7, Canada
[2] Kishimoto Sangyo HK Co Ltd, Unit 2608, Kowloon, Hong Kong, Peoples R China
来源：
INTERNATIONAL JOURNAL OF EXERGY | 2008年 / 5卷 / 01期
关键词：
exergy; coal; steam power plant; combustion; steam generator; stack gas; efficiency;
D O I：
10.1504/IJEX.2008.016011
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Modifications are examined to increase coal-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 1.4% when the fraction of excess combustion air decreases from 0.4 to 0.15, and by 3.5% when the stack-gas temperature decreases from 149 degrees C to 87 degrees C. When both decreases occur, plant energy and exergy efficiencies both increase by 4.1%, If theoretical combustion air is used, the plant energy and exergy efficiencies both increase by 4.7% when the stack-gas temperature is 87 degrees C.
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页码：31 / 51
页数：21
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