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A numerical analysis of a composition-adjustable Kalina cycle power plant for power generation from low-temperature geothermal sources

机译:用于低温地热源发电的可组成调节的Kalina循环发电厂的数值分析

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摘要

The Kalina cycle is believed to be one of the most promising technologies for power generation from low temperature heat sources such as geothermal energy. So far, most Kalina cycle power plants are designed with a working fluid mixture having a fixed composition, and thus normally operate at a fixed condensing temperature. However, the ambient temperature (i.e., heat sink) varies over a large range as the season changes over a year, particularly in continental climates. Recently, a new concept, i.e., composition-adjustable Kalina cycle, was proposed to develop power plants that can match their condensing temperature with the changing ambient conditions, aiming at improving the cycle’s overall thermal efficiency. However, no detailed analysis of its implementation and the potential benefits under various climate conditions has been reported. For this reason, this paper carried out a comprehensive numerical research on its implementation and performance analysis under several different climate conditions. A mathematical model is firstly established to simulate the working principle of a composition-adjustable Kalina cycle, based on which a numerical program is then developed to analyse the cycle’s performance under various climate conditions. The developed numerical model is verified with some published experimental data. The 2uddynamic composition adjustment in response to the changing ambient temperature is simulated to evaluate its effect on the plant’s performance over a year. The results show that a composition-adjustable Kalina cycle could achieve higher annual-average thermal efficiency than a conventional one with a fixed mixture composition. However, such an improvement of thermal efficiency strongly depends on the heat source temperature, climate conditions, etc. The composition-adjusting system introduces extra capital and operation costs. The economic viability of a composition-adjustable Kalina cycle power plant depends on the balance between these extra costs and the increase of thermal efficiency.
机译:Kalina循环被认为是从低温热源(例如地热能)发电的最有前途的技术之一。到目前为止,大多数卡利纳循环发电厂都设计有成分固定的工作流体混合物,因此通常在固定的冷凝温度下运行。但是,环境温度(即散热器)随着季节的变化在一年中变化很大,特别是在大陆性气候中。最近,有人提出了一种新的概念,即可调节成分的Kalina循环,来开发能够使冷凝温度与变化的环境条件相匹配的发电厂,旨在提高循环的整体热效率。但是,尚未报告对其实施和在各种气候条件下的潜在好处的详细分析。因此,本文在几种不同的气候条件下对其实施和性能分析进行了全面的数值研究。首先建立数学模型来模拟可调节成分的Kalina循环的工作原理,然后在此模型基础上开发一个数值程序来分析该循环在各种气候条件下的性能。所开发的数值模型已通过一些公开的实验数据进行了验证。通过模拟2 uddynamic的成分调整来响应不断变化的环境温度,以评估其对工厂一年内性能的影响。结果表明,与固定混合物组成的常规循环相比,可调节成分的Kalina循环可实现更高的年平均热效率。但是,这种热效率的提高很大程度上取决于热源温度,气候条件等。组成调节系统会带来额外的资金和运营成本。成分可调的Kalina循环电厂的经济可行性取决于这些额外成本与热效率提高之间的平衡。

著录项

  • 作者

    Wang Enhua; Yu Zhibin;

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  • 年度 2016
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  • 原文格式 PDF
  • 正文语种 en
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