摘要
为减少温室气体排放,建立燃煤机组耦合熔盐储能碳捕集系统以实现提高电厂性能同时降低碳排放。储能工况下采用再热后蒸汽加热低温熔盐并为再沸器中乙醇胺(MEA)溶液再生提供能量;释能工况下以高温熔盐加热回水,MEA溶液再生能量取自中压缸排汽,基于Ebsilon软件搭建热力仿真模型并对耦合系统热力性能及碳排放预测进行分析。结果表明:75%额定工况(THA)下耦合熔盐储能碳捕集系统相比于相同负荷下传统碳捕集机组全厂热效率提高3.14百分点,相比单独燃煤机组大气CO_(2)排放量降低82.34 t/h;释能过程机组输出功率降低量低于储能工况下机组输出功率降低量,当碳捕集率为95%时,储能过程机组输出功率变化量占额定负荷的34.99%,释能过程机组输出功率变化量占额定负荷的6.68%。储能系统和碳捕集系统的引入使传统燃煤电厂在保证做功能力基础上实现CO_(2)捕集,大幅度降低大气CO_(2)排放量。
In order to reduce greenhouse gas emissions,a carbon capture system for coal-fired units coupled with molten salt energy storage has been established to improve the performance of power plants and reduce carbon emissions.Under the storage condition,the low-temperature molten salt was heated by steam after reheating and provided energy for the regeneration of ethanolamine solution(MEA)in the reboiler.Under the energy release condition,the high-temperature molten salt was used to heat the return water,and the regeneration energy of the ethanolamine solution was supplied by the exhaust steam from the medium-pressure cylinder.A thermal simulation model was constructed on the basis of the Ebsilon software,and the thermal performance of the coupled system and the prediction of the carbon emission were analyzed.The results showed that the plant-wide thermal efficiency of the coupled molten salt energy storage carbon capture system under 75%THA condition was increased by 3.14 percentage point compared with the traditional carbon capture unit under the same load,and the atmospheric CO_(2) emission was reduced by 82.34 t/h compared with that of the coal-fired unit alone.The output power reduction of the energy release process unit is less than that of the energy storage condition.When the carbon capture rate is 95%,the output power variation of the energy storage process unit accounts for 34.99%of the rated load,while the output power variation of the energy release process unit accounts for 6.68%of the rated load.The introduction of energy storage systems and carbon capture systems allows traditional coal-fired power plants to achieve CO_(2) capture while ensuring their functional capabilities,significantly reducing atmospheric CO_(2) emissions.
作者
于静梅
郭朋
YU Jingmei;GUO Peng(School of Mechanical Engineering,Liaoning Technical University)
出处
《环境工程技术学报》
北大核心
2025年第5期1476-1485,共10页
Journal of Environmental Engineering Technology
基金
辽宁省教育厅项目(LJKZ0367)。
关键词
熔盐储能
碳排放预测
储能抽汽
碳捕集率
molten salt energy storage
carbon emission prediction
energy storage and vapor extraction
carbon capture rate
