改进型太阳能–干法碳酸盐系统的燃煤电站灵活性碳捕集方案分析  

Analysis of Flexible CO Capture Scheme for Novel Solar Energy-DCP System in Coal-fired Power Plant

作　　者：杨宁[1] 孔德皓 周云龙[1] YANG Ning;KONG Dehao;ZHOU Yunlong(College of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林省吉林市132012

出　　处：《中国电机工程学报》2020年第14期4547-4558,共12页Proceedings of the CSEE

基　　金：吉林省产业创新重大专项(2019C056-2);吉林省教育厅科学研究规划项目(JJKH20180438KJ)。

摘　　要：由于CO2排放对全球气候变化的显著影响导致燃煤电站的碳捕集问题受到广泛关注。采用干法碳酸盐(dry carbonate process,DCP)捕集低温烟气中CO2相比于传统钙循环方法(calcium cycle,CaL)具有诸多优势,且太阳能可用于提供吸附剂再生所需热量,从而取代汽轮机中低压抽汽。然而,现有研究并未改善DCP操作流程,传统的设备布置不仅增加热量损失,还增加了投资成本。研究以600MW燃煤电站尾部烟气为对象,通过去除DCP中再生器和再沸器,提出槽式太阳能集热器直接加热吸附剂的改进型方案,即吸附剂再生在集热管道中进行,不仅降低设备投资和运行成本,而且实现DCP工艺与燃煤电站解耦,消除DCP对电站蒸汽循环依赖,进一步提升系统操作的灵活性,显著增加集成系统的技术经济优势。选用EBSILON和Aspen plus构建燃煤电站与改进型方案模型,全面提升了改进型方案灵活运行过程的装置性能和年发电量,为系统的设备检修提供足够时间,缓解了瞬态气候条件的影响,研究结果将为改进型太阳能-DCP系统的应用提供有利指导。Carbon capture for coal-fired power plant(PP) draws an increasing attention due to the significant impact of CO2 emissions on global climate change. The dry carbonate process(DCP) has many advantages over the conventional calcium cycle(CaL) for CO2 capture in low temperature flue gas, and solar energy can be used to provide the heat for sorbent regeneration, thus replacing the low pressure steam extraction from turbine. However, the existing researches have not improved the DCP operation, the conventional equipment arrangement not only increases the heat loss, but also increases the investment cost. The exhaust gas of a 600 MW PP was used as the case in this paper, and a novel scheme directly heating sorbent in trough solar collector was proposed by removing the regenerator and reboiler from DCP, that is, the sorbent regeneration was carried out in the collector pipe. It not only reduces the capital and operation cost, but also decouples the DCP from PP and eliminates the dependence of DCP on steam cycle, further improves the flexibility of DCP operation and significantly increases the technical and economic advantages. EBSILON professional and Aspen Plus were selected to establish the model of PP and novel scheme, and improved the performance and annual power generation during flexible operation of this scheme. It provides enough time for equipment maintenance and alleviates the impact of transient climate conditions. The results will provide useful guidance for the application of novel solar energy-DCP system.

关 键 词：改进型太阳能 干法碳酸盐(DCP)系统 燃煤电站 灵活性 碳捕集 可行性 

分 类 号：TK115[动力工程及工程热物理—热能工程]