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首页> 外文期刊>Energy Conversion & Management >Thermodynamic analysis of oxy-fuel combustion integrated with the sCO_2 Brayton cycle for combined heat and power production
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Thermodynamic analysis of oxy-fuel combustion integrated with the sCO_2 Brayton cycle for combined heat and power production

机译：氧燃料燃烧热力学分析与SCO_2 BRAYTON循环结合热电型电力生产

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摘要

The supercritical CO2 (sCO(2)) Brayton cycle is highly efficient in terms of its power production efficiency and is also compact in structure. It is therefore expected to substitute the steam Rankine cycle in various applications. In addition, the high temperature heat that is disposed to the heat sink in the sCO(2) cycle can be further utilized to increase the economy and profitability of the plant. In this paper, we report the integration of the sCO(2) cycle with single-stage reheating and recompression with the pulverized coal oxy-fuel combustion process for combined heat and power production. The integrated system was analyzed in terms of its thermodynamic performance, including its electrical efficiency and heating efficiency. For oxy-fuel combustion, different flue gas recycling modes, i.e., wet mode and dry mode, were compared. Under the basic sCO(2) cycle conditions of 30 MPa/600 degrees C/ 600 degrees C, the electrical efficiencies for the wet and dry modes were 36.6 and 35.3%, respectively, while the corresponding heating efficiencies were 15.4 and 14.9%, respectively, with a total efficiency of 52.0% for the wet mode and 50.2% for the dry mode. Furthermore, the CO2 capture rate was determined to be similar to 99.94%. Sensitivity analysis was conducted, and the influences of the turbine inlet temperature, turbine inlet pressure, oxygen concentration, turbine outlet pressure, and split ratio in the high-temperature recuperator were investigated. Finally, the residual heat from the air separation unit and the flue gas was recovered and integrated with the sCO(2) cycle, and it was found that the heat recovery decreased the split ratio to recompression and could add a 0.3-2.7 percentage point increment to the electrical efficiency, in addition to a 0.3-2.1 percentage point increment to the heating efficiency.
机译：超临界CO2（SCO（2））Brayton循环在其功率生产效率方面具有高效，结构紧凑。因此，预期将蒸汽朗肯循环替换为各种应用。另外，可以进一步利用在SCO（2）周期中的散热器中的高温热量来增加植物的经济性和盈利能力。在本文中，我们报告了SCO（2）周期与单级再加热和再压缩的整合，采用粉煤氧 - 燃料燃烧过程，用于组合热量和电力生产。在其热力学性能方面分析了集成系统，包括其电效率和加热效率。对于氧燃料燃烧，比较了不同的烟气回收模式，即湿式模式和干燥模式。在30MPa / 600摄氏度C / 600℃的基本SCO（2）循环条件下，湿式和干式模式的电效率分别为36.6和35.3％，而相应的加热效率分别为15.4％和14.9％ ，湿式模式的总效率为52.0％，干式模式为50.2％。此外，CO 2捕获率确定为类似于99.94％。研究了灵敏度分析，研究了涡轮机入口温度，涡轮机入口压力，氧气浓度，涡轮出口和高温恢复器中的分流比的影响。最后，回收来自空气分离单元和烟道气的残余热量，并与SCO（2）循环集成，发现热回收率降低了转速与再压缩，并且可以增加0.3-2.7个百分点增量到电效率，除了0.3-2.1个百分点的加热效率。

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  • 来源
    《Energy Conversion & Management》 |2021年第3期|113869.1-113869.17|共17页
  • 作者

    Chen Shiyi; Zheng Yilin; Wu Mudi; Hu Jun; Xiang Wenguo;

  • 作者单位

    Southeast Univ Sch Energy & Environm Minist Educ Key Lab Energy Thermal Convers & Control Nanjing 210096 Peoples R China;

    Southeast Univ Sch Energy & Environm Minist Educ Key Lab Energy Thermal Convers & Control Nanjing 210096 Peoples R China;

    Southeast Univ Sch Energy & Environm Minist Educ Key Lab Energy Thermal Convers & Control Nanjing 210096 Peoples R China;

    Southeast Univ Sch Energy & Environm Minist Educ Key Lab Energy Thermal Convers & Control Nanjing 210096 Peoples R China;

    Southeast Univ Sch Energy & Environm Minist Educ Key Lab Energy Thermal Convers & Control Nanjing 210096 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; sCO(2) Brayton cycle; Combined heat and power; CO2 capture;

    机译：氧气燃料燃烧;SCO（2）布雷顿循环;综合发热和力量;二氧化碳捕获;

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