Performance Optimization for Open Brayton CHP Plant Considering Pressure Drop

doi:10.3901/JME.2016.10.166

Abstract

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

CLC Number:

TK12

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.

References

[1] 李孝堂, 侯凌云, 杨敏, 等. 现代燃气轮机技术[M]. 北京：航空工业出版社, 2006.
LI Xiaotang, HOU Lingyun, YANG Min, et al. Mordern gas turbine technology[M]. Beijing：Aviation Industry Press, 2006.
[2] 吴仲华. 能的梯级利用与燃气轮机总能系统[M]. 北京：机械工业出版社, 1988.
WU Zhonghua. Cascade utilization of thermal energy and integrated energy system of gas turbine[M]. Beijing：China Machine Press, 1988.
[3] 张娜, 蔡睿贤. 功热并供回热燃气轮机及其热力分析[J]. 工程热物理学报, 1996, 17(2)：150-152.
ZHANG Na, CAI Ruixian. Recuperative gas turbine cogeneration and its analysis[J]. J. Engng. Thermophys., 1996, 17(2)：150-152.
[4] VIEIRA L S, MATT C F, GUEDES V G, et al. Maximization of the profit of a complex combined-cycle cogeneration plant using a professional process simulator[J]. Trans. ASME J. Eng. Gas Turbine Power, 2010, 132(4)：41801.
[5] TORCHIO M F. Energy-exergy, environmental and economic criteria in combined heat and power (CHP) plants：Indexes for the evaluation of the cogeneration potential[J]. Energies, 2013, 6(5)：2686-2708.
[6] BEJAN A. Entropy generation minimization：The new thermodynamics of finite-size devices and finite time process[J]. J. Appl. Phys., 1996, 79(3)：1191-1218.
[7] BEJAN A, DAN N. Maximum power from fluid flow[J]. Int. J. Heat Mass Trans., 1996, 39(6)：1175-1181.
[8] BERRY R S, KAZAKOV V A, SIENIUTYCZ S, et al. Thermodynamic optimization of finite time processes[M]. Chichester：Wiley, 1999.
[9] CHEN Lingen, SUN Fengrui. Advances in finite time thermodynamics：Analysis and optimization[M]. New York：Nova Science Publishers, 2004.
[10] 陈林根. 不可逆过程和循环的有限时间热力学分析[M]. 北京：高等教育出版社, 2005.
CHEN Lingen. Finite-time thermodynamic analysis of irreversible processes and cycles[M]. Beijing：Higher Education Press, 2005.
[11] 吴锋, 陈林根, 孙丰瑞, 等. 斯特林机的有限时间热力学优化[M]. 北京：化学工业出版社, 2008.
WU Feng, CHEN Lingen, SUN Fengrui, et al. Finite time thermodynamic optimization for stirling machines[M]. Beijing：Chemical Industry Press, 2008.
[12] SIENIUTYCZ S, JEZOWSKI J. Energy optimization in process system[M]. Oxford：Elsevier, 2009.
[13] ANDRESEN B. Current trends in finite-time thermodynamics[J]. Angew. Chem. Int. Ed., 2011, 50(12)：2690-2704.
[14] BEJAN A. Entropy generation minimization, exergy analysis, and the constructal law[J]. Arab. J. Sci. Eng., 2013, 38(2)：329-340.
[15] 张万里, 陈林根, 韩文玉, 等. 正反向布雷顿循环有限时间热力学分析与优化研究进展[J]. 燃气轮机技术, 2012, 25(2)：1-11.
ZHANG Wanli,, CHEN Lingen, HAN Wenyu, et al. Advances in finite time thermodynamic studies for analyses and optimizations of direct/inverse Brayton cycles[J]. Gas Turbine Technol., 2012, 25(2)：1-11.
[16] 王文华, 陈林根, 戈延林, 等. 燃气轮机循环有限时间热力学研究新进展[J]. 热力透平, 2012, 41(3)：171-178, 208.
WANG Wenhua, CHEN Lingen, GE Yanlin, et al. New advances in finite time thermodynamic studies for gas turbine cycles[J]. Therm. Turbine, 2012, 41(3)：171-178, 208.
[17] 李俊, 陈林根, 戈延林, 等. 正反向两源热力循环有限时间热力学性能优化的研究进展[J]. 物理学报, 2013, 62(13)：130501.
LI Jun, CHEN Lingen, GE Yanlin, et al. Progress in the study on finite time thermodynamic optimization for direct and reverse two-heat-reservoir thermodynamic cycles[J]. Acta Phys. Sin., 2013, 62(13)：130501.
[18] HAO Xiaoli, ZHANG Guoqiang. Maximum useful energy-rate analysis of an endoreversible Joule-Brayton cogeneration cycle[J]. Appl. Energy, 2007, 84(11)：1092-1101.
[19] TAO Guisheng, CHEN Lingen, SUN Fengrui, et al. Exergoeconomic performance optimization for an endoreversible simple gas turbine closed-cycle cogeneration plant[J]. Int. J. Ambient Energy, 2009, 30(3)：115-124.
[20] 许益霖, 黄跃武. 不可逆中冷焦耳-布雷顿功热并供系统火用分析[J]. 热能动力工程, 2011, 26(2)：186-190.
XU Yilin, HUANG Yuewu. Exergy analysis of an irreversible intercooled Joule-Brayton power and heating cogeneration system[J]. J. Engng. Therm. Energy Power, 2011, 26(2)：186-190.
[21] UST Y, SAHIN B, YILMAZ T. Optimization of a regenerative gas-turbine cogeneration system based on a new exergetic performance criterion：Exergetic performance coefficient[J]. Proc. IMechE, Part A：J. Power Energy, 2007, 221(4)：447-458.
[22] TAO Guisheng, CHEN Lingen, SUN Fengrui. Exergoeconomic performance optimization for an endoreversible regenerative gas turbine closed-cycle cogeneration plant[J]. Rev. Mex. Fis., 2009, 55(3)：192-200.
[23] YANG Bo, CHEN Lingen, SUN Fengrui. Finite time exergoeconomic performance of an irreversible intercooled regenerative Brayton cogeneration plant[J]. J. Energy Inst., 2011, 84(1)：5-12.
[24] YANG Bo, CHEN Lingen, SUN Fengrui. Exergoeconomic performance analyses of an endreversible intercooled regenerative Brayton cogeneration type model[J]. Int. J. Sustainable Energy, 2011, 30(2)：65-81.
[25] 杨博, 陈林根, 孙丰瑞. 两级中冷回热再热布雷顿热电联产装置的火用性能[J]. 工程热物理学报, 2012, 33(3)：366-370.
YANG Bo, CHEN Lingen, SUN Fengrui. Exergy performance of a two-stage intercooled regenerated reheated brayton combined heat and power plant[J]. J. Engng. Thermophys., 2012, 33(3)：366-370.
[26] RADCENCO V, VARGAS J V C, BEJAN A. Thermodynamics optimization of a gas turbine power plant with pressure drop irreversibilities[J]. Trans. ASME J. Energy Resour. Technol., 1998, 120(3)：233-240.
[27] CHEN Lingen, LI Ye, SUN Fengrui, et al. Power optimization of open-cycle regenerator gas-turbine power plants[J]. Appl. Energy, 2004, 78(2)：199-218.
[28] 王文华, 陈林根, 孙丰瑞. 开式燃气轮机中冷循环热力学优化[J]. 机械工程学报, 2004, 40(10)：149-154.
WANG Wenhua, CHEN Lingen, SUN Fengrui. Thermodynamic optimization of an open intercooled gas turbine power plant[J]. Chin. J. Mech. Engng., 2004, 40(10)：149-154.
[29] ZHANG Wanli, CHEN Lingen, SUN Fengrui. Power and efficiency optimization for combined Brayton and inverse Brayton cycles[J]. Appl. Therm. Eng., 2009, 29(14-15)：2885-2894.
[30] RADCENCO V. Generalized thermodynamics[M]. Bucharest：Editura Techica, 1994.
[31] BEJAN A. Heat transfer[M]. New York：Wiley, 1993.
[32] GORDON C O. Aerodynamics of aircraft engine components[M]. New York：AIAA, 1985.
[33] RADCENCO V. Optimization criteria for irreversible thermal processes[M]. Bucharest：Editura Tehnica, 1979.
[34] BROWN A, JUBRAN B A, MARTIN B W. Coolant optimization of a gas turbine engine[J]. Proc. IMechE, Part A：J. Power Energy, 1993, 207(A1)：31-47.
[35] 赵冠春, 钱立伦. 火用分析及其应用[M]. 北京：高等教育出版社, 1984.
ZHAO Guanchun, QIAN Lilun. Exergy analysis and its Application[M]. Beijing：Higher Education Press, 1984.
[36] 沈维道, 蒋智敏, 童钧耕. 工程热力学[M]. 3版. 北京：高等教育出版社, 2001.
SHEN Weidao, JIANG Zhimin, TONG Jungeng. Engineering thermodynamics[M]. 3rd ed. Beijing：Higher Education Press, 2001.