雷霆,梁友才,朱雁,叶凯,凌珣杰,丁锦能,胡成贤

• 1:华南理工大学电力学院

摘要(Abstract)：

燃烧后碳捕集工艺是实现低碳发电的兜底技术和必然选择，然而其整合至天然气联合循环电厂会大幅降低电厂发电效率。为了降低集成脱碳系统电厂的效率惩罚以及提高整体系统能源利用效率，提出一个综合回收系统余热和液化天然气冷能的新型燃烧后碳捕集流程。首先，对常规碳捕集工艺的关键操作参数包括再生塔压力和贫液载荷进行灵敏度分析得到最佳运行参数，在此基础上开展新型流程的设计及分析。新型流程利用小汽轮机回收低压抽汽的压力，能辅助贫液蒸气压缩并回收CO_2压缩中间冷却热加热再生塔冷凝回流水，在90k Pa的闪蒸压降下每吨CO_2最低再生能耗为3.35GJ，降低了17.3%。此外，通过回收抽汽过热使低压抽蒸汽量从68.40 kg/s降低至48.95 kg/s。针对常规CO_2压缩工艺能耗高和液化天然气气化过程中冷能浪费的问题，提出一种新型CO_2两级压缩中间液化工艺，使压缩功降低了34.5%，并大幅减少冷却负荷和设备数量。?分析结果表明，新型碳捕集工艺和CO_2压缩工艺的?效率分别从23.12%和62.19%升至29.48%和65.96%。模拟结果显示，整合新型碳捕集工艺的发电机组净输出功从341.93 MW增至358.75 MW，净发电效率从48.85%升至51.25%，效率惩罚从13.77%降至9.53%，节能效果十分显著。

关键词(KeyWords)： 天然气联合循环电厂;燃烧后碳捕集;工艺改进;效率惩罚;液化天然气冷能利用

Abstract:

Keywords:

基金项目(Foundation): 广东省高水平人才项目（2021QN02L165）;; 中央高校基本科研业务费专项资金（2024ZYGXZR019）~~

作者(Author): 雷霆,梁友才,朱雁,叶凯,凌珣杰,丁锦能,胡成贤

DOI: 10.19666/j.rlfd.202411229

参考文献(References)：

• [1] HE T, CHONG Z R, ZHENG J, et al. LNG cold energy utilization:prospects and challenges[J]. Energy, 2019,170:557-568.
• [2] International Energy Agency(IEA). Natural gas-fired electricity[Z]. IEA, 2022.
• [3] ESQUIVEL-PATI?O G G, SERNA-GONZáLEZ M,NáPOLES-RIVERA F. Thermal integration of natural gas combined cycle power plants with CO2 capture systems and organic Rankine cycles[J]. Energy Conversion and Management, 2017, 151:334-342.
• [4] LUO X, WANG M, CHEN J. Heat integration of natural gas combined cycle power plant integrated with post-combustion CO2 capture and compression[J]. Fuel,2015, 151:110-117.
• [5]刘飞,关键,祁志福,等.燃煤电厂碳捕集、利用与封存技术路线选择[J].华中科技大学学报(自然科学版),2022, 50(7):1-13.LIU Fei, GUAN Jian, QI Zhifu, et al. Technology route selection for carbon capture utilization and storage in coal-fired power plants[J]. Journal of Huazhong University of Science and Technology(Natural Science Edition), 2022, 50(7):1-13.
• [6] MIKUL?I?H, SKOV I R, DOMINKOVI?D F, et al.Flexible carbon capture and utilization technologies in future energy systems and the utilization pathways of captured CO2[J]. Renewable and Sustainable Energy Reviews, 2019, 114:109338.
• [7] MORES P, RODRíGUEZ N, SCENNA N, et al. CO2capture in power plants:minimization of the investment and operating cost of the post-combustion process using MEA aqueous solution[J]. International Journal of Greenhouse Gas Control, 2012, 10:148-163.
• [8] LI K, LEIGH W, FERON P, et al. Systematic study of aqueous monoethanolamine(MEA)-based CO2 capture process:techno-economic assessment of the MEA process and its improvements[J]. Applied Energy, 2016,165:648-659.
• [9] OH S Y, BINNS M, CHO H, et al. Energy minimization of MEA-based CO2 capture process[J]. Applied Energy,2016, 169:353-362.
• [10]郭李恒,丁玉栋,廖强,等.基于蒸汽压缩-分流的电厂烟气CO2捕集过程模拟优化[J].动力工程学报2021, 41(7):565-571.GUO Liheng, DING Yudong, LIAO Qiang, et al.Simulation and optimization of carbon dioxide capture process in power plant based on vapor compression and split flow[J]. Journal of Power Engineering, 2021, 41(7):565-571.
• [11]陆诗建,高丽娟,王家凤,等.烟气CO2捕集热能梯级利用节能工艺耦合优化[J].化工进展, 2020, 39(2):728-737.LU Shijian, GAO Lijuan, WANG Jiafeng, et al. Coupling optimization of energy-saving technology for cascade utilization of flue gas CO2 capture system[J]. Chemical Industry and Engineering Progress, 2020, 39(2):728-737.
• [12]李杨,王妮妮,陈振华,等.亚临界机组碳捕集系统优化及其对热力系统影响的模拟研究[J].工程热物理学报, 2024, 45(5):1255-1263.LI Yang, WANG Nini, CHEN Zhenhua, et al. Simulation study on the optimization of carbon capture system and its impact on thermal system in subcritical coal-fired power plants[J]. Journal of Engineering Thermophysics,2024, 45(5):1255-1263.
• [13]李青,余云松,姜钧,等.基于热泵技术的化学吸收法二氧化碳捕集系统[J].高校化学工程学报, 2010,24(1):29-34.LI Qing, YU Yunsong, JIANG Jun, et al. CO2 capture by chemical absorption method based on heat pump technology[J]. Journal of Chemical Engineering in Higher Education, 2010, 24(1):29-34.
• [14] HU Y, XU G, XU C, et al. Thermodynamic analysis and techno-economic evaluation of an integrated natural gas combined cycle(NGCC)power plant with post-combustion CO2 capture[J]. Applied Thermal Engineering, 2017, 111:308-316.
• [15]冯凌杰,翟融融,郭一村,等.耦合碳捕集系统的燃气蒸汽联合循环综合性能研究[J].发电技术, 2022,43(4):584-592.FENG Lingjie, ZHAI Rongrong, GUO Yicun, et al.Study on the comprehensive performance of natural gas combined cycle plant integrated with carbon capture system[J]. Power Generation Technology, 2022, 43(4):584-592.
• [16] BAO J, ZHANG L, SONG C, et al. Reduction of efficiency penalty for a natural gas combined cycle power plant with post-combustion CO2 capture:integration of liquid natural gas cold energy[J]. Energy Conversion and Management, 2019, 198:111852.
• [17] SULTAN H, MUHAMMAD H A, BHATTI U H, et al.Reducing the efficiency penalty of carbon dioxide capture and compression process in a natural gas combined cycle power plant by process modification and liquefied natural gas cold energy integration[J]. Energy Conversion and Management, 2021, 244:114495.
• [18]戴宇泽,王丹丹,刘锋,等.双吸收升温型热泵驱动电厂碳捕集的方案研究[J].工程热物理学报, 2018,39(11):2347-2355.DAI Yuzhe, WANG Dandan, LIU Feng, et al. Study on post combustion CO2 capture in power plant integrated with double absorption heat transformer[J]. Journal of Engineering Thermophysics, 2018, 39(11):2347-2355.
• [19]李俊,陈煜. LNG冷能回收及梯级利用研究进展[J].制冷学报, 2022, 43(2):1-12.LI Jun, CHEN Yu. Research progress of cold energy recovery and cascade utilization of LNG[J]. Journal of Refrigeration, 2022, 43(2):1-12.
• [20] KIM Y, LEE J, CHO H, et al. Novel cryogenic carbon dioxide capture and storage process using LNG cold energy in a natural gas combined cycle power plant[J].Chemical Engineering Journal, 2023, 456:140980.
• [21] LIANG Y, YE K, ZHU Y, et al. Thermodynamic analysis of two-stage and dual-temperature ejector refrigeration cycles driven by the waste heat of exhaust gas[J]. Energy,2023, 278:127862.
• [22] SZARGUT J M, MORRIS D R, STEWARD F R. Exergy analysis of thermal, chemical, and metallurgical processes[M]. New York:Hemisphere Publishing,1988:1.
• [23] FERRARA G, LANZINI A, LEONE P, et al. Exergetic and exergoeconomic analysis of post-combustion CO2capture using MEA-solvent chemical absorption[J].Energy, 2017, 130:113-128.
• [24]?I L E. Aspen HYSYS simulation of CO2 removal by amine absorption from a gas based power plant[C]//The48th Scandinavian Conference on Simulation and Modeling(SIMS 2007), 30-31 October, 2007, G?teborg(S?r?). 2007:73-81.
• [25] ABU-ZAHRA M R M, SCHNEIDERS L H J,NIEDERER J P M, et al. CO2 capture from power plants:Part I. A parametric study of the technical performance based on monoethanolamine[J]. International Journal of Greenhouse Gas Control, 2007, 1(1):37-46.