洁净煤技术

2021, v.27;No.132(02) 170-179

[打印本页] [关闭]
本期目录(Current Issue) | 过刊浏览(Past Issue) | 高级检索(Advanced Search)

燃煤电站与光伏余热辅助胺法脱碳系统集成
Integration of coal-fired power station and photovoltaic waste heat assisted amine decarbonization system

邢晨健;王瑞林;赵传文;
XING Chenjian;WANG Ruilin;ZHAO Chuanwen;School of Energy and Mechanical Engineering,Nanjing Normal University;

摘要(Abstract):

为应对全球变暖问题,对现有燃煤电站进行碳捕集改造以及大力发展清洁能源势在必行。化学吸收法在碳捕集技术中发展最为成熟,但其再生能耗极高严重影响了燃煤电站自身的发电效率,因此有学者提出通过清洁能源辅助碳捕集的利用方式,其中光热辅助碳捕集应用最为广泛,但该利用方式未发挥单一光热的利用潜力。通过利用聚光光伏发电过程中产生的大量低品位废热辅助碳捕集可以提高光伏系统效率同时对低品位废热进行了有效利用。基于此构思了聚光光伏-光伏余热直接辅助碳捕集的新系统,建立了聚光砷化镓-余热辅助胺法脱碳的能量转化模型,验证了聚光光伏余热在质和量上都具有直接辅助胺法脱碳的潜力,依据热耗灵敏度分析优化了胺法脱碳系统关键参数,其最低热耗可达3.7 GJ/t,分析了电池工作温度及辐照强度对系统碳捕集性能以及光电效率的影响规律,确定了电池最优工作温度为140℃。将新系统集成于典型600 MW燃煤电站,并与参比系统比较可得:相较于单一燃煤碳捕集,电站发电效率提升6.01个百分点,同时增加光伏发电185.2 MW;相较于单一光伏发电,光伏发电量降低15.79 MW,但占接收太阳能60%的余热得到了有效利用,可实现CO_2捕集461.75 t/h。新系统在典型日的光伏日均发电为61.8 MW,日均碳捕集量为155.6 t/h,为实现年碳捕集保证率达80%以上,需要约4 km~2以上的聚光面积。新系统利用光伏余热代替了原本从电站低压缸抽汽,消除了碳捕集对电站的能源惩罚,同时将高品位的太阳能转化为电,并对低品位的光伏余热进行对口利用。系统最终实现了太阳能的高效利用以及化石能源的并行清洁利用。
In order to deal with the problem of global warming,it is imperative to transform the carbon capture of existing coal-fired power plants and vigorously develop clean energy. Chemical absorption method is the most mature in carbon capture technology,but its high energy consumption seriously affects the power generation efficiency of coal-fired power stations. Therefore,some scholars have proposed the use of clean energy-assisted carbon capture,in which photo-thermal-assisted carbon capture is the most widely used,but this use method does not play the potential of single photo-thermal utilization. By using a large amount of low-grade waste heat generated in the process of concentrating photovoltaic power generation to assist carbon capture,the efficiency of the photovoltaic system can be improved while the low-grade waste heat is effectively used. Based on this research,a new system of concentrating photovoltaics-photovoltaic waste heat directly assisted carbon capture was conceived,and an energy conversion model of concentrating gallium arsenide-waste heat assisted amine decarbonization was established to verify the potential of concentrated photovoltaic waste heat directly assisted amine decarbonization in quality and quantity. According to the sensitivity analysis of heat consumption,the key parameters of the amine decarburization system were optimized. The minimum heat consumption could reach 3.7 GJ/t. The influence of battery working temperature and radiation intensity on the carbon capture performance and photoelectric efficiency of the system was analyzed,and the optimal working temperature of the battery was determined as 140 ℃ . By integrating the new system into a typical 600 MW coal-fired power station and comparing it with the reference system,it can be obtained that compared with a single coal-fired carbon capture,the power generation efficiency of the power station is increased by 6.01%,and the photovoltaic power generation is increased by 185.2 MW; compared with a single photovoltaic,the photovoltaic power generation is reduced by 15.79 MW,but the waste heat accounting for 60% of the received solar energy is effectively used,which can achieve 461. 75 t/h CO_2 capture. The average daily photovoltaic power generation of the new system on a typical day is 61.8 MW,and the average daily carbon capture capacity is 155.6 t/h. In order to achieve an annual carbon capture guarantee rate of more than 80%,the Concentrating photovoltaic area above about 4 km~2 is required. The new system uses photovoltaic waste heat instead of the original low-pressure cylinder extraction steam from the power station,eliminating the energy penalty of carbon capture on the power station,while converting high-grade solar energy into electricity,and using photvoltaic waste heat in a grade-matched manner. The system finally realizes the efficient use of solar energy and the parallel clean use of fossil energy.

关键词(KeyWords): 胺法脱碳;太阳能辅助碳捕集;光伏发电;光伏余热利用;燃煤电站碳捕集
amine decarbonization;solar assisted carbon capture;photovoltaic power generation;photovoltaic residual heat utilization;carbon capture in coal-fired power plants

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(U1510129)

作者(Author): 邢晨健;王瑞林;赵传文;
XING Chenjian;WANG Ruilin;ZHAO Chuanwen;School of Energy and Mechanical Engineering,Nanjing Normal University;

Email:

DOI: 10.13226/j.issn.1006-6772.CCUS20092901

参考文献(References):

文章评论(Comment):

序号(No.) 时间(Time) 反馈人(User) 邮箱(Email) 标题(Title) 内容(Content)
反馈人(User) 邮箱地址(Email)
反馈标题(Title)
反馈内容(Content)
扩展功能
本文信息
服务与反馈
本文关键词相关文章
本文作者相关文章
中国知网
分享