摘要
碳捕集、利用与封存(carbon capture,utilization,and storage,CCUS)技术是推动我国电力行业向低碳化转型的关键手段。但目前我国CCUS项目所捕集CO_(2)多用于驱油或地质封存,缺乏采用其他碳消纳途径的商业化连续运行案例。为了全面评估燃煤电厂实施全流程碳捕集项目的可行性,以某岛域电厂新建的7×10^(4) t·a^(−1)全流程燃煤电厂碳捕集项目为案例,详细阐述了项目的技术路线,并对试运行阶段的碳捕集装置运行参数和能耗进行分析。结果表明,当烟气流量维持在3.7×10^(4) Nm^(3)·h^(−1)以下,吸收液循环流量控制在195~210 Nm^(3)·h^(−1),吸收塔贫液温度保持在40℃以下,吸收剂质量分数在30%~35%时,碳捕集装置的运行效果最为理想。此外,在连续满负荷运行且无液化工况下,碳捕集装置每小时的吸收再生电耗为517 kWh,压缩液化电耗为850 kWh;而全液化工况下,每小时的吸收再生电耗增至652 kWh,压缩液化电耗增至1107 kWh;再生蒸汽用量随每小时碳捕集量增加而减小;气化热耗则相对稳定,为0.19 t·tCO_(2)−1。结合项目所在特殊岛域的实际情况,对项目经济性进行综合评估。分析结果表明:项目所在岛域拥有广阔的碳消纳市场,展现出良好的经济效益;但类似项目在其他区域可能因缺乏合适的碳消纳市场而难以盈利,因此,仍需进一步探索适合的碳消纳途径,并健全相关政策法规,争取政策层面的扶持。研究结果可为同类型碳捕集项目的运行研究及碳消纳途径的拓展提供参考依据。
Carbon Capture,Utilisation and Storage(CCUS)technology is a key means to promote the transition of China's power sector to decarbonisation.However,currently in China,most of the carbon dioxide captured by CCUS projects is used for oil displacement or geological storage,and there is a lack of commercial continuous operation cases that adopt other carbon absorption pathways.In order to comprehensively assess the feasibility of implementing a full-flow carbon capture project in a coal-fired power plant,a new 7×10^(4) t·a^(−1) full-scale coal-fired power plant carbon capture project in an island power plant was taken as a case study,the technical route of the project was elaborated in detail,and the operating parameters and energy consumption of the carbon capture device in the trial operation stage are analyzed.The results showed that the flue gas flow rate was maintained below 3.7×10^(4) Nm^(3)·h^(−1),the absorber circulating flow rate was controlled at 195~210 Nm^(3)·h^(−1),the temperature of the lean liquor in the absorber tower was maintained at below 40℃,and the absorber concentration was 30%-35%.In addition,under continuous full-load operation without liquefaction condition,the hourly power consumption of carbon capture device was 517 kWh for absorption and regeneration,and 850 kWh for compression and liquefaction.Under full liquefaction condition,the hourly power consumption of absorption and regeneration increaseD to 652 kWh,and that of compression and liquefaction increaseD to 1107 kWh.The regeneration steam consumption decreased with the increase of the hourly amount of carbon capture,and the consumption of gasification steam was relatively stable.The steam consumption for gasification was relatively stable,with 0.19 t of steam required for every 1 t of carbon dioxide gasified.Combined with the actual situation of the special island where the project was located,and a comprehensive evaluation of the project economy was carried out.The results of the analysis showed that the island where the project was located had a broad carbon market and showed good economic benefits.However,similar projects in other regions might not be profitable due to the lack of a suitable carbon market,so it was still necessary to further explore suitable ways of carbon consumption,and improve the relevant policies and regulations in order to obtain support at the policy level.The results of this study can provide a reference basis for the operation of similar carbon capture projects and the expansion of carbon consumption pathways.
作者
朱棪
徐斌
ZHU Yan;XU Bin(State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;Shanghai Changxing Island Thermal Power CO.,Ltd.,Shanghai 200092,China;Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China)
出处
《环境工程学报》
北大核心
2025年第8期1934-1942,共9页
Chinese Journal of Environmental Engineering
关键词
燃煤电厂
碳捕集
碳利用
经济性
coal-fired power plants
carbon capture
carbon utilisation
economics
