有机朗肯循环
地热能
兰金度
涡轮机
电
朗肯循环
发电
按来源划分的电力成本
夹点
地热能
环境科学
联合循环
工艺工程
功率(物理)
工作液
余热
可再生能源
地温梯度
余热回收装置
可用能
火用
热效率
废物管理
工程类
热力学
机械工程
地质学
电气工程
物理
地球物理学
作者
Marco Astolfi,Matteo Carmelo Romano,Paola Angela Bombarda,Ennio Macchi
出处
期刊:Energy
[Elsevier]
日期:2014-03-01
卷期号:66: 435-446
被引量:185
标识
DOI:10.1016/j.energy.2013.11.057
摘要
Abstract This two-part paper investigates the potential of ORC (Organic Rankine Cycles) for the exploitation of low-medium enthalpy geothermal brines. Part A deals with thermodynamic analysis and optimization, while Part B focuses on economic optimization. In this part, an economic model was defined and implemented in the Matlab® code previously developed. A routine was also implemented to estimate the design of the turbine (number of stages, rotational speed, mean diameter), allowing to estimate turbine efficiency and cost. The tool developed allowed performing an extensive techno-economic analysis of many cycles exploiting geothermal brines with temperatures between 120 °C and 180 °C. By means of an optimization routine, the cycles and the fluids leading to the minimum cost of the electricity are found for each geothermal source considered. Cycle parameters found from the techno-economic optimization are compared with those assumed and found from the thermodynamic optimization. Quite relevant differences show the necessity to perform optimization on the basis of specific plant cost. As a general trend, it is however confirmed that configurations based on supercritical cycles, employing fluids with a critical temperature slightly lower than the temperature of the geothermal source, lead to the lowest electricity cost for most of the investigated cases.
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