Exergy analysis and optimization of Dieng single-Flash geothermal power plant
Exergy analysis and optimization of Dieng single-Flash geothermal power plant
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DOI：
10.1016/j.enconman.2013.10.073
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发表时间：
2014-02
影响因子：
10.4
通讯作者：
N. A. Pambudi;R. Itoi;S. Jalilinasrabady;Khasani Jaelani
中科院分区：
文献类型：
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作者：
N. A. Pambudi;R. Itoi;S. Jalilinasrabady;Khasani Jaelani
通过建立数学模型并将其应用于印度尼西亚迪昂地热电厂，对一座单闪光地热电厂进行了火用分析和优化。计算使用工程方程求解器(EES)程序，使用基于热力学定律的方法。计算了分离器、汽轮机、凝汽器以及整个电厂几个部件的(火用)流量和效率，从生产井排出的地热流体的(火用)估算为59.52兆瓦。这一量的流体从电厂整体产生21.71亿兆瓦的电力，第二定律效率为36.48%。有相当数量的废盐水，占总可用(火用)的17.98%(10.70兆瓦)，被处置在工厂的储水池中。通过调整分离器压力对装置进行了优化。结果表明，将分离器压力从10千巴降低到9千巴，可使输出功率略有增加20千瓦。格拉斯曼图显示了发电厂中每个部件的火用损失。汽轮机和分离器损失分别为7.51兆瓦(12.62%)和8.04兆瓦(13.5%)，而冷却塔的火用损失为2.62兆瓦(4.40%)。凝汽器总损耗为5.8兆瓦(9.75%)。
Exergy analysis and optimization of a single-flash geothermal power plant are conducted by developing a mathematical model that is applied to the Dieng geothermal power plant in Indonesia. Calculations are conducted by using the Engineering Equation Solver (EES) code using methods based on the laws of thermodynamics. The exergy flow and efficiency are computed at several plant components, including the separator, turbine, condenser, and for the whole power plant.The exergy of the geothermal fluid that is discharged from the production wells is estimated to be 59.52 MW. This amount of fluid produces 21.71 MW of electricity from the power plant overall, with second law efficiency to be 36.48%. There is a considerable amount of waste brine, amounting to 17.98% (10.70 MW) of the total available exergy, which is disposed of in the plant’s reservoir. The optimization of the plant is carried out by adjusting the separator pressure. The results show that a slight increase of 20 kW in the output power can be attained by lowering the separator pressure to 9 bar from 10 bar. The Grassmann diagram shows the exergy losses at each component in the power plant. The turbine and separator losses are 7.51 MW (12.62%) and 8.04 MW (13.5%), respectively, while the cooling tower has an exergy loss of 2.62 MW (4.40%). The total condenser loss is 5.8 MW (9.75%).