全流-双循环地热发电系统分析
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摘要
采用全流-双循环地热发电系统对中低温地热水进行利用发电,并与闪蒸蒸汽系统进行比较.理论推导闪蒸蒸汽系统的最佳闪蒸温度,分析比较了全流-双循环系统中各部分的损失,进而提出了降低换热器端差,以减少损的措施.在既定的地热水参数条件下,根据系统模型对全流-双循环系统和闪蒸蒸汽系统进行热力计算.结果显示:全流-双循环系统的最大发电功率比闪蒸系统的最大发电功率高出12.7%;全流-双循环系统的功率随着低温工质蒸发温度的升高而增大;闪蒸蒸汽系统的功率随着闪蒸压力的增大呈先上升后下降的趋势.
A total flow system with binary cycle was used in geothermal power generation with low-medium temperature,and compared with flash system.The optimal flash temperature was derived theoretically.Different parts of the total flow system with binary cycle were analyzed with the exergy loss,so as to propose the direction of reducing the exergy loss and optimizing the system which is reducing the minimum temperature difference of hot side and cold side of heat exchanger.Under the given condition,these two plants were calculated according to their system models.As shown by the calculation result,the maximum total capacity of total flow system with binary cycle is higher than that of the flash system by 12.7%.The power of the total flow system with binary cycle increases with the rise of the evaporation temperature of the organic fluid,and the power of the flash system firstly increases and then decreases while the flash pressure rises up.
A total flow system with binary cycle was used in geothermal power generation with low-medium temperature,and compared with flash system.The optimal flash temperature was derived theoretically.Different parts of the total flow system with binary cycle were analyzed with the exergy loss,so as to propose the direction of reducing the exergy loss and optimizing the system which is reducing the minimum temperature difference of hot side and cold side of heat exchanger.Under the given condition,these two plants were calculated according to their system models.As shown by the calculation result,the maximum total capacity of total flow system with binary cycle is higher than that of the flash system by 12.7%.The power of the total flow system with binary cycle increases with the rise of the evaporation temperature of the organic fluid,and the power of the flash system firstly increases and then decreases while the flash pressure rises up.
引文
[1]朱家玲.地热能开发与应用技术[M].北京:化学工业出版社,2006.
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[3]蔡向明,翁一武,郑斌.太阳能喷射式电冷联供系统的性能析[J].动力工程学报,2010,30(6):462-467.CAI Xiang-ming,WENG Yi-wu,ZHENG Bin.Per-formance analysis of a solar ejector power and refrige-ration cogeneration system[J].Journal of Power Engi-neering,2010,30(6):462-467.
[4]吴治坚,龚宇烈,马伟斌,等.闪蒸-双工质循环联合地热发电系统研究[J].太阳能学报,2009,30(3):316-321.WU Zhi-jian,GONG Yu-lie,MA Wei-bin,et al.Re-search on geothermal power generation by flash systemcombined with binary cycle[J].Acta Energy SolarisSinica,2009,30(3):316-321.
[5]庞麓鸣,汪孟砾,冯海仙.工程热力学[M].北京:人民出版社,1982.
[6]朱明善.能量系统的分析[M].北京:清华大学出版社,1988.
[2]黄翔超.有机工质双循环螺杆膨胀机系统研究[D].天津:天津大学热能工程系,2006.
[3]蔡向明,翁一武,郑斌.太阳能喷射式电冷联供系统的性能析[J].动力工程学报,2010,30(6):462-467.CAI Xiang-ming,WENG Yi-wu,ZHENG Bin.Per-formance analysis of a solar ejector power and refrige-ration cogeneration system[J].Journal of Power Engi-neering,2010,30(6):462-467.
[4]吴治坚,龚宇烈,马伟斌,等.闪蒸-双工质循环联合地热发电系统研究[J].太阳能学报,2009,30(3):316-321.WU Zhi-jian,GONG Yu-lie,MA Wei-bin,et al.Re-search on geothermal power generation by flash systemcombined with binary cycle[J].Acta Energy SolarisSinica,2009,30(3):316-321.
[5]庞麓鸣,汪孟砾,冯海仙.工程热力学[M].北京:人民出版社,1982.
[6]朱明善.能量系统的分析[M].北京:清华大学出版社,1988.