基于卡利纳循环的低温热源利用供热发电联合系统的热力学和经济分析

IF 5.1 3区 工程技术 Q2 ENERGY & FUELS
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引用次数: 0

摘要

卡利纳循环可有效回收和利用低温热源,但效率较低。为了提高能源转换效率,本文提出了一种新型的热电联产系统,该系统将卡利纳循环与氨水吸收式制冷循环整合在一起。该系统能独特地回收所有废热以产生供热能力,热效率达到 100%。我们建立了详细的热力学和经济模型,并在此基础上进行了性能优化,结果表明新系统的性能普遍优于卡利纳循环系统,其放热效率为 34.47%,投资回收期为 2.31 年。进一步的性能分析表明,涡轮机的功率输出对经济性能有重大影响,而大部分放能损耗发生在热交换器类型的设备上。最后,参数敏感性分析探讨了七个关键变量对系统性能的影响。结果表明,提高基本溶液的氨浓度和涡轮机入口温度,同时降低涡轮机入口压力,可提高系统的放能效。为实现最短的投资回收期,确定了强氨溶液的最佳氨浓度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermodynamic and economic analysis of a Kalina cycle-based combined heating and power system for low-temperature heat source utilization

The Kalina cycle is effective for recovering and utilizing low-temperature heat sources, but it suffers from low efficiency. In order to enhance energy conversion efficiency, this paper proposes a novel combined heating and power system that integrates the Kalina cycle with an ammonia-water absorption refrigeration cycle. This system uniquely recovers all wasted heat to generate heating capacity, achieving 100 % thermal efficiency. Detailed thermodynamic and economic models are developed, based on which a performance optimization is conducted and shows that the new system generally outperforms the Kalina cycle with an exergy efficiency of 34.47 % and a payback period of 2.31 years. Further performance analysis reveals that turbine power output significantly impacts economic performance, and most exergy destructions occur in the heat exchanger-type equipment. Finally, a parameter sensitivity analysis explores the effects of seven key variables on system performance. Results indicate that increasing the ammonia concentration of the basic solution and turbine inlet temperature, while decreasing the turbine inlet pressure, improves the exergy efficiency of system. An optimal ammonia concentration of the ammonia-strong solution is identified for achieving the shortest payback period.

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来源期刊
Thermal Science and Engineering Progress
Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
7.20
自引率
10.40%
发文量
327
审稿时长
41 days
期刊介绍: Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.
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