先进储能型燃煤热电联产系统热力特性及灵活性分析

Thermodynamics and Flexibility Analysis of a Novel Coal-fired CHP-CAES System

为了提高机组灵活性,提出了一种热电联产机组、先进绝热压缩空气储能(AA-CAES)系统和热网耦合集成的储能型燃煤热电联产系统。对某350 MW热电联产机组与30 MWAA-CAES系统耦合集成系统的能流特性进行数值研究,分析了独立运行及耦合运行2种模式下系统的能源综合利用水平和调节范围。结果表明:以80%额定供热负荷为例,在同等供热量时,集成系统的能源利用率可提升1.10百分点,最小负荷率降低了11.69百分点,最大发电能力提升22.24 MW(约为额定功率的6.35%),单次循环节煤27.26 t;其他供热工况下结果与此类似,证明该先进储能型燃煤热电联产系统在热电解耦、提高灵活性、清洁供暖、能源利用等方面具有优势。

To enchance operation flexibility,a novel integrated system of combined heat and power(CHP) unit,advanced adiabatic compressed air energy storage(AA-CAES) system,and district heating system was proposed.Energy flow analysis and system performance study based on a 350 MW CHP unit and a 30 MW AA-CAES system were carried out.The energy comprehensive utilization level and regulation range under the two modes of independent operation and coupled operation were analyzed.Results show that for the same heating load ratio of 80%,the energy utilization efficiency is enhanced by 1.10%.The minimum load rate is reduced by 11.69%,and the maximum power generation capacity is increased by 22.24 MW which is about 6.35% of the rated power.27.26 tons of coal is saved for one cycle.The results are similar for other heating conditions.The advantages of the proposed system in heat-power decoupling,enhancing operation flexibility,clean heating,as well as energy utilization are demonstrated.