适用于长输热力管网的蓄热罐系统研究

Research on Heat Storage Tank System for Long-distance Thermal Pipe Network

随着可再生能源的快速发展和火电的转型,电厂进行供热改造的需求日益增强。电厂至热用户的长输管网工程建设已经开始普及。参考北欧的发展经验,在长输管网中设置配套的蓄热罐系统,可以有效地实现热电解耦,增强电厂发电的灵活性和供热的稳定性。本研究完成了适用于工程实例的蓄热罐的选型计算,实现了蓄热罐与大高差长输热力管网的结合。在输送能力为1 350 MW的长输热力管网中设置容量8万m^(3)蓄热功率400 MW的蓄热罐,能够实现热电解耦,电厂机组灵活调峰幅度提高16%,全年累积蓄热量达29.1万MWh。电厂调峰产生的效益可以在4年左右超过蓄热罐建设投资。综上,在长输热力管网中引入蓄热罐,可以大幅提升电厂调峰能力,提升供热稳定性和可靠性,同时具备良好的经济性。

With the rapid development of renewable energy and the transformation of thermal power development, the demand for heating transformation of power plants is increasing. The construction of long-distance pipeline network from power plant to heat users has begun to be popularized. Referring to the development experience of northern Europe,setting a supporting heat storage tank system in the long-distance pipeline network can effectively realize thermoelectric decoupling and enhance the flexibility of power generation and the stability of heat supply. The heat storage tank with capacity of 80000 m^(3) and heat storage power of 400 MW is set in the long-distance heat transmission pipeline network with transmission capacity of 1350 mw,which can realize thermal power decoupling. The flexible peak shaving range of power plant units is increased by 16%,and the annual cumulative heat storage capacity is 291000 MWh. The profit from peak load regulation of power plant can exceed the construction investment of heat storage tank in about four years. To sum up,the introduction of heat storage tank in the long-distance heat pipe network can greatly improve the peak shaving capacity of the power plant,improve the stability and reliability of heating,and have good economy.