• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (20): 151-156.doi: 10.3901/JME.2014.20.151

• 论文 • 上一篇    下一篇



  1. 天津大学中低温高效利用教育部重点实验室
  • 出版日期:2014-10-20 发布日期:2014-10-20

Techno-economic Study of Carbon Capture from Coal-fired Power Plant Using MEA Assisted by Solar Organic Rankine Cycle for Power Generation

TAN Yuting;ZHAO Li;BAO Junjiang;DENG Shuai   

  • Online:2014-10-20 Published:2014-10-20

摘要: 提出一种有机朗肯循环太阳能热发电辅助燃煤电厂碳捕集系统,该系统利用聚焦式太阳能驱动有机朗肯循环(Organic rankine cycle,ORC)发电系统,ORC系统高温冷凝热为燃煤电厂醇胺法CO2捕集系统提供热量,ORC热利用效率理论上达到100%。该系统避免了传统碳捕集系统汽轮机抽汽,保证了燃煤电厂的稳定运行和经济效益。对新型碳捕集系统的热力学性能参数进行设计匹配,筛选适用于高温ORC太阳能热发电系统的有机工质,备选工质为甲苯、辛烷、硅油MDM及环乙烯。对新型碳捕集系统及抽汽式碳捕集系统进行经济性分析与比较,计算均化成本、碳捕获成本和净现值。结果显示:在碳捕获率小于90%时,新型碳捕集系统均化成本更高;新型碳捕集系统较之抽汽式系统碳捕获成本更高,约为抽汽式系统碳捕获成本的2倍;当太阳能热发电补贴电价超过1.18元/(kW•h)时,新型碳捕集系统具有更高的经济性,当太阳能热发电补贴电价低于0.82元/(kW•h)时,抽汽式碳捕集系统具备更高的经济性,当太阳能热发电补贴电价处于两者之间时,新型碳捕集系统与抽汽式碳捕集系统的经济性高低取决于燃煤电厂的碳捕获率。

关键词: 可行性, 燃煤电厂, 太阳能, 碳捕集, 有机朗肯循环

Abstract: A carbon capture system applied in coal-fired power plant assisted by solar organic rankine cycle (ORC) for power generation is studied; the ORC system is driven by concentrated solar energy for power generation, the heat of condensation is for carbon capture system using MEA applied in coal-fired power plant, which makes thermal efficiency of ORC 100% theoretically. The system guarantees stable operation and high benefit of the coal-fired power plants via avoiding steam extraction from steam turbine. ORC working fluid candidates are selected based on thermodynamic analysis and parameter design of the system. Toluene, octane, silicone oil MDM and cyclohex are four candidate ORC working fluid. Economic analysis and comparison between different carbon capture systems are conducted based on levelized cost of electricity (LCOE), cost of carbon (COC) and net present value (NPV). When carbon capture rate is less than 90%, LCOE of proposed system is higher than that of traditional carbon capture based on steam extraction. COC of new system is higher than that of traditional one, approximately twice. The new system has higher NPV than that of normal one when subsidy electricity price for concentrated solar power (CSP) is higher than 1.18 CNY/(kW•h), otherwise, if subsidy electricity price for (CSP) is lower than 0.82 CNY/(kW•h), traditional system has higher NPV, and it depends on carbon capture rate to decide which system has better economy when subsidy electricity price is between them.

Key words: carbon capture, coal-fired power plant, feasibility, organic rankine cycle, solar energy