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Exergoeconomic analysis and optimization of the Allam cycle with liquefied natural gas cold exergy utilization

机译：液化天然气冷颤利用液化天然气循环的Exergo经济分析与优化

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摘要

The Allam cycle is a promising oxy-fuel combustion power cycle with high electrical efficiency and near-zero carbon dioxide emissions. In this paper, the thermodynamic and exergoeconomic analyses are performed for a novel combined power and cooling oxy-fuel power cycle, which combines the Allam cycle with liquefied natural gas regasification process. Parametric study is conducted to investigate the effects of key cycle variables on the electrical and exergy efficiencies and total product unit cost of the proposed cycle. Multi-objective optimization is carried out to maximize the exergy efficiency and minimize the total product unit cost. The results show that Condenser 2 has the highest exergy destruction of 22.81 MW, followed by the combustor (22.72 MW). The combustor, Condenser 2 and gas turbine are the three most important components from exergoeconomic aspects. The introduction of adiabatic compression heat of the bypass stream has a positive impact on the system performance, especially when the outlet temperature of the combustor is low. The optimization results indicate that the exergy efficiency and the total product unit cost cannot reach the optimal values at the same time. The highest exergy efficiency of 50.31% and the lowest total product unit cost of 16.654 $/GJ are obtained respectively with different sets of cycle variables. In addition, the electrical efficiency of the optimized proposed cycle is up to around 65.7%, about 11 percentage points higher than that of the Allam cycle.
机译：Allam循环是具有高电效率和近零二氧化碳排放的有前途的氧燃料燃烧动力循环。在本文中，对新型组合电力和冷却氧燃料电源循环进行了热力学和Exergo经济分析，其将Allam循环与液化天然气再扫描过程结合起来。进行参数研究以调查关键循环变量对所提出的循环的电气和漏洞效率的影响和总产品单位成本。进行多目标优化，以最大限度地提高高度效率，最大限度地减少总产品单位成本。结果表明，冷凝器2具有22.81兆瓦的最高漏洞破坏，其次是燃烧器（22.72 MW）。燃烧器，冷凝器2和燃气轮机是来自Exergo经济方面的三种最重要的组件。旁路流的绝热压缩热量引入对系统性能产生正影响，特别是当燃烧器的出口温度低时。优化结果表明，电流效率和总产品单位成本同时无法达到最佳值。最高漏洞效率为50.31％，最低总产品单位成本为16.654 $ / gj，不同的循环变量为单位获得。此外，优化的提出循环的电效率高达约65.7％，比阿拉姆循环高约11个百分点。

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  • 来源
    《Energy Conversion & Management》 |2021年第5期|113972.1-113972.16|共16页
  • 作者

    Chan Wen; Li Huixiong; Li Xi; Chang Fucheng; Wang Lele; Feng Zemin;

  • 作者单位

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China;

    Chongqing Univ Sci & Technol Coll Safety Engn Chongqing 401331 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Oxy-fuel combustion; Allam cycle; LNG; Carbon capture; Exergoeconomic; Multi-objective optimization;

    机译：氧气燃料燃烧;Allam循环;LNG;碳捕获;exergo经济;多目标优化;

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