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Thermoeconomic evaluation and optimization of a Brayton-Rankine-Kalina combined triple power cycle

机译：Brayton-Rankine-Kalina组合三重功率循环的热经济学评估和优化

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This paper presents thermoeconomic analysis and optimization of a Brayton-Rankine-Kalina combined triple power cycle using Specific Exergy Costing (SPECO) methodology. Cost-balance and auxiliary equations are formulated for each component and for each node and solved through a MATLAB program to get the average cost per unit exergy at different state points. To evaluate the cost effectiveness of the system, the values of thermoeconomic variables for each component are calculated. Large relative cost difference is observed in the steam turbine, HRSG's, combustion chambers, compressors, recuperators and ammonia-water evaporator. Therefore, these components require greater attention. The performance of steam turbine, combustion chambers, recuperators and ammonia-water evaporator can be appreciably improved by capital investment into more efficient design due to their low values of exergoeconomic factor. The performance of HRSG's can be improved only marginally due to slightly higher value of exergoeconomic factor but no such recommendation can be made for the compressors which have a quite high value of exergoeconomic factor. The objective function of the thermoeconomic optimization is the minimization of the total cost rate for the whole plant. Its minimum value is found to occur at a gas cycle pressure ratio of around 14. Decreasing inlet air temperature decreases this objective function parameter significantly while increasing relative humidity causes a small decrease in it.
机译：本文介绍了使用比热能成本法（SPECO）的Brayton-Rankine-Kalina联合三重循环的热经济分析和优化。为每个组件和每个节点制定成本平衡和辅助方程式，并通过MATLAB程序求解，以获取不同状态点的平均单位能动成本。为了评估系统的成本效益，计算了每个组件的热经济变量的值。在蒸汽轮机，HRSG，燃烧室，压缩机，同流换热器和氨水蒸发器中观察到较大的相对成本差异。因此，这些组件需要引起更多关注。蒸汽轮机，燃烧室，同流换热器和氨水蒸发器的性能可以通过较低的能效经济因素投入资本，进行更有效的设计，从而显着提高。 HRSG的性能由于能效系数略高而只能略微提高，但对于能效系数极高的压缩机则无法提出这样的建议。热经济优化的目标功能是使整个工厂的总成本率最小化。发现它的最小值出现在大约14的气体循环压力比处。降低的进气温度会显着降低该目标函数参数，而相对湿度的升高则会导致该参数的小幅降低。

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