太阳能辅助的燃气富氧燃烧脱碳发电系统的热力性能研究

Study on Thermal Performance of Solar-assisted Gas Fired Decarburization Power Generation System with Oxygen-enriched Combustion

提出了燃气富氧燃烧脱碳发电系统(方案1)、耦合余热回收技术的燃气富氧燃烧脱碳发电系统(方案2)和太阳能辅助的燃气富氧燃烧脱碳发电系统(方案3)3种方案,通过研究三者的热经济指标及经济性,确定方案3为最优碳捕集方案,并讨论了方案3的逐时热力性能。结果表明:方案2和方案3在增加机组建设成本前提下,均可改善机组的热力性能;与方案2相比,方案3可使机组每年多发电91047.06 MW,节省燃料成本3003万元;随环境温度和太阳能法向直接辐射量的提高,方案3的燃气轮机发电量下降,但集成系统的净发电量和净发电效率大幅提高。

Three schemes were proposed including a gas fired decarburization power generation system with oxygen-enriched combustion(scheme 1),an oxygen-enriched combustion gas fired decarburization power generation system integrated with waste heat recovery technology(scheme 2),and a solar-assisted gas fired decarburization power generation system with oxygen-enriched combustion(scheme 3).By studying the thermal economic indicators and economy of the three,scheme 3 is the optimal carbon capture approach,and the hourly thermal performance of which was further studied.Results show that both scheme 2 and scheme 3 can improve the unit’s thermal performance on the premise of increasing the cost of unit construction.Compared with scheme 2,scheme 3 can generate 91047.06 MW more power per year and save fuel cost by 30.03 million yuan.In addition,with the increase of ambient temperature and solar direct normal irradiance,the power output of gas turbine generation in scheme 3 decreases,whereas the net power generation and net efficiency of the integrated system increase significantly.