许宏宇,陈硕,许诚

• 1:华北电力大学能源动力与机械工程学院

摘要(Abstract)：

在富氧燃烧CO_2循环中，空分热集成通常用于改善回热过程的热容匹配。然而，空分单元的热集成增加了循环的回热量，同时由于空分单元负荷调节速率较低，对发电系统运行性能产生一定影响。为了取消空分热集成并进一步提高循环效率，提出了一种分流绝热压缩的方法，旨在平衡冷、热流股的热容。在Aspen仿真软件中构建了基于煤气化富氧燃烧超临界CO_2循环发电系统模型，分析了系统热力学性能以及空分热集成对系统性能的影响，并提出了再压缩系统作为对比。研究结果表明：集成空分热量的常规系统循环效率为43.39%；相比无热集成系统，空分单元的压缩耗功增加了19.9 MW，同时提供了180.8 MW的热集成，使得循环效率提升了1.64百分点；考虑到回热端差的限制，再压缩系统的最佳分流质量流量为258.2kg/s；相比空分热集成，再压缩系统的回热负荷降低了59.8MW，且平均换热温差进一步降低了3.1℃，循环效率提升至43.52%。研究揭示了热量集成对富氧燃烧CO_2循环效率的影响机制，提出了解耦动力循环与空分单元热集成的流程优化方式，同时为再压缩系统的参数设计提供了理论指导。

关键词(KeyWords)： 富氧燃烧;超临界CO_2循环;煤气化;碳捕集;再压缩

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目（2023YFB4102400）~~

作者(Author): 许宏宇,陈硕,许诚

DOI: 10.19666/j.rlfd.202501007

参考文献(References)：

• [1]王倩,王卫良,刘敏,等.超(超)临界燃煤发电技术发展与展望[J].热力发电, 2021, 50(2):1-9.WANG Qian, WANG Weiliang, LIU Min, et al.Development and prospect of(ultra)supercritical coal-fired power generation technology[J]. Thermal Power Generation, 2021, 50(2):1-9.
• [2]白章,胡楠楠,王硕硕,等.生物质秸秆在聚光太阳能驱动下的动态热解特性实验[J].实验技术与管理,2024, 41(3):54-61.BAI Zhang, HU Nannan, WANG Shuoshuo, et al.Experimental study on dynamic characteristics of biomass straw pyrolysis driven by concentrated solar energy[J]. Experimental Technology and Management,2024, 41(3):54-61.
• [3]王哮江,刘鹏,李荣春,等.“双碳”目标下先进发电技术研究进展及展望[J].热力发电, 2022, 51(1):52-59.WANG Xiaojiang, LIU Peng, LI Rongchun, et al.Research progress and prospects of advanced power generation technologies under the “Dual Carbon”goals[J]. Thermal Power Generation, 2022, 51(1):52-59.
• [4]于良,辛团团,张逸飞,等.基于过程拆分的半闭式超临界CO2循环热力学分析及流程优化[J].动力工程学报, 2024, 44(6):991-1000.YU Liang, XIN Tuantuan, ZHANG Yifei, et al.Thermodynamic analysis and process optimization of a semi-closed supercritical CO2 cycle using process splitting method[J]. Journal of Chinese Society of Power Engineering, 2024, 44(6):991-1000.
• [5] WEILAND N, SHELTON W, SHULTZ T, et al.Performance and cost assessment of a coal gasification power plant integrated with a direct-fired s CO2 Brayton cycle:NETL-PUB-21435[R]. National Energy Technology Laboratory(NETL), Pittsburgh, PA, Morgantown, WV,and Albany, OR(United States), 2017.
• [6]赵永明.整体煤气化超临界二氧化碳动力循环的热力学研究[D].北京:中国科学院大学, 2018:1.ZHAO Yongming. Thermodynamic study of the supercritical carbon dioxide power cycle integrated with coal gasification process[D]. Beijing:University of Chinese Academy of Sciences, 2018:1.
• [7] ZHAO Y M, WANG B, CHI J L, et al. Parametric study of a direct-fired supercritical carbon dioxide power cycle coupled to coal gasification process[J]. Energy Conversion and Management, 2018, 156:733-745.
• [8] ZHAO Y, ZHAO L, WANG B, et al. Thermodynamic analysis of a novel dual expansion coal-fueled direct-fired supercritical carbon dioxide power cycle[J].Applied Energy, 2018, 217:480-495.
• [9] LU X, FORREST B, MARTIN S, et al. Integration and optimization of coal gasification systems with a near-zero emissions supercritical carbon dioxide power cycle[C]. ASME Turbo Expo 2016:Turbomachinery Technical Conference and Exposition. 2016.
• [10] TIAN Y, FENG H, ZHANG Y, et al. New insight into Allam cycle combined with coal gasification in supercritical water[J]. Energy Conversion and Management, 2023, 292:117432.
• [11] JIN B, SU M, ZHAO H, et al. Plantwide control and operating strategy for air separation unit in oxy-combustion power plants[J]. Energy Conversion and Management, 2015, 106:782-792.
• [12] MITCHELL C, AVAGYAN V, CHALMERS H, et al. An initial assessment of the value of Allam cycle power plants with liquid oxygen storage in future GB electricity system[J]. International Journal of Greenhouse Gas Control, 2019, 87:1-18.
• [13]封康,郑莆燕,仇中柱,等.超临界二氧化碳动力循环余热利用方案优化研究[J].热力发电, 2023, 52(6):119-126.FENG Kang, ZHENG Puyan, QIU Zhongzhu, et al.Study on optimization of supercritical carbon dioxide power cycle schemes in waste heat utilization[J].Thermal Power Generation, 2023, 52(6):119-126.
• [14]俞骏,刘晓锋.具备碳捕集功能的半闭式再压缩超临界二氧化碳布雷顿循环的经济性分析[J].热力发电,2022, 51(10):35-41.YU Jun, LIU Xiaofeng. Economic analysis of semi-closed re-compression S-CO2 Brayton cycle with inherent CO2 capture[J]. Thermal Power Generation,2022, 51(10):35-41.
• [15]陈东旭,韩中合,赵林飞.超临界二氧化碳再压缩燃煤发电系统火用分析[J].热力发电, 2020, 49(10):107-113.CHEN Dongxu, HAN Zhonghe, ZHAO Linfei. Exergy analysis for coal-fired power generation system with supercritical carbon dioxide recompression cycle[J].Thermal Power Generation, 2020, 49(10):107-113.
• [16] WEILAND N T, WHITE C W. Techno-economic analysis of an integrated gasification direct-fired supercritical CO2 power cycle[J]. Fuel, 2018, 212:613-625.
• [17] HERVY M, PHAM MINH D, GéRENTE C, et al. H2S removal from syngas using wastes pyrolysis chars[J].Chemical Engineering Journal, 2018, 334:2179-2189.
• [18] BEYSEL G. Enhanced cryogenic air separation:a proven process applied to oxyfuel[C].1st Oxyfuel Combustion Conference. Cottbus, Germany, 2009.
• [19] SCACCABAROZZI R, GATTI M, MARTELLI E.Thermodynamic analysis and numerical optimization of the NET Power oxy-combustion cycle[J]. Applied Energy, 2016, 178:505-526.
• [20] XU C, XIN T, LI X, et al. A thermodynamic analysis of a solar hybrid coal-based direct-fired supercritical carbon dioxide power cycle[J]. Energy Conversion and Management, 2019, 196:77-91.
• [21] XIN T, XU C, LI R, et al. An advanced coal-based zero-emission polygeneration system using water-gas shift reaction and syngas recycle to achieve different methanol and electricity distributions[J]. Journal of Cleaner Production, 2022, 364:132649.
• [22] JU Y, LEE C H. Evaluation of the energy efficiency of the shell coal gasification process by coal type[J]. Energy Conversion and Management, 2017, 143:123-136.
• [23] ZUIDEVELD P L, POSTUMA A. Overview of experience with the shell coal gasification process[J].Materials at High Temperatures, 1993, 11(1/4):19-22.
• [24] XU H, XU C, GUO H, et al. Thermodynamic analysis and numerical optimization of a coal-based Allam cycle with full water quench syngas cooling[J]. Energy Conversion and Management, 2023, 297:117716.
• [25] XIN T, XU C, YANG Y, et al. A new process splitting analytical method for the coal-based Allam cycle:Thermodynamic assessment and process integration[J].Energy, 2023, 267:126634.
• [26] ALLAM R J, PALMER M R, BROWN G W, et al. High efficiency and low cost of electricity generation from fossil fuels while eliminating atmospheric emissions,including carbon dioxide[J]. Energy Procedia, 2013, 37:1135-1149.