Journal of Mechanical Engineering >

2016 , Vol. 52 >Issue 10: 166 - 175

DOI: https://doi.org/10.3901/JME.2016.10.166

Performance Optimization for Open Brayton CHP Plant Considering Pressure Drop

  • YANG Bo ,
  • CHEN Lingen ,
  • WANG Wenhua ,
  • SUN Fengrui
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  • 1. Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan 430033;
    2. Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan 430033;
    3. College of Power Engineering, Naval University of Engineering, Wuhan 430033

Online published: 2016-05-15

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Abstract

Considering pressure drop irreversibility of working fluid in the flowing process, a finite time thermodynamic model of an open simple Brayton combined heat and power(CHP) plant is established. The performances of the plant are investigated by taking useful energy rate, exergy output rate, profit rate, first law efficiency and exergy efficiency as the objectives. Through Matlab numerical calculation, when there is no constraint for fuel consumption and total size of the plant, the relative pressure drop of compressor inlet is optimized, and the optimal useful energy rate, exergy output rate and profit rate are obtained, respectively. When the optimization is performed further with respect to pressure ratio, the maximum exergy output rate and profit rate are obtained. In the case of with the constraints, the relative pressure drop of compressor inlet is optimized, and the optimal first law efficiency and exergy efficiency are obtained, respectively, meanwhile the components’ optimal flow area distributions are obtained. When the optimization is performed further with respect to pressure ratio, the maximum first law efficiency and exergy efficiency are obtained, respectively. The effects of design parameters on the optimal performances are investigated. It is found that there exists three optimal thermal consumer temperatures which lead to double maximum exergy output rate, profit rate and exergy efficiency, respectively. The performance comparisons show that the maximum exergy output rate design can make the plant has larger useful energy rate and lower pressure ratio, while the maximum profit rate design leads to larger first law efficiency and exergy efficiency, and lower fuel and air consumption.

Key words： open simple Brayton combined heat and power(CHP) plant; finite time thermodynamics; useful energy rate; exergyoutput rate; profit rate; first law efficiency; exergy efficiency

Cite this article

YANG Bo , CHEN Lingen , WANG Wenhua , SUN Fengrui . Performance Optimization for Open Brayton CHP Plant Considering Pressure Drop[J]. Journal of Mechanical Engineering, 2016 , 52(10) : 166 -175 . DOI: 10.3901/JME.2016.10.166

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