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

被引：35
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.
引用
收藏
页码：31 / 51
页数：21
相关论文
共 53 条
[1]  
[Anonymous], 1992, STEAM ITS GENERATION
[2]  
[Anonymous], PRESSURIZED FLUDIZED
[3]  
Asano H., 2004, International Journal of Exergy, V1, P29
[4]  
Borgert JA., 2004, INT J EXERGY, V1, P18
[5]  
CAN A, 2002, EXERGY INT J, V2, P113
[6]  
CATE J, 1998, POWER, V142, P25
[7]  
Cengel Y.A., 2006, THERMODYNAMICS ENG A, VFifth
[8]  
COWNDEN R, 2001, EXERGY INT J, V1, P112, DOI DOI 10.1016/S1164-0235(01)00017-6
[9]   Energy consumption in China: past trends and future directions [J].
Crompton, P ;
Wu, YR .
ENERGY ECONOMICS, 2005, 27 (01) :195-208
[10]  
CZIESLA F, 2003, P 2003 ASME INT MECH
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