小型堆-生物质综合能源系统运行模式研究

Study on operation mode of small reactor-biomass integrated energy system

核能供热的研究对我国城市集中供暖的发展具有重要意义。小型堆与生物质机组耦合的综合能源系统与单一核供热堆相比,在供热方面提升了负荷调节的灵活性以及堆的经济性,但随之带来多能耦合导致系统组合复杂、运行模式繁多等问题。为了让系统的运行模式在满足热负荷需求的同时兼顾经济性,针对生物质机组的抽凝和背压2种运行方式、低压缸的启停个数和小型堆的运行个数进行研究分析,得到该系统的6种典型运行模式及与之对应的热电负荷特性,并根据电负荷范围计算每种模式的调峰容量比。以热负荷调节范围和调峰容量比为依据,对这6种模式分别进行2次筛选,得到最佳运行模式。结果显示:在最佳模式下运行时,该综合能源系统既能为热网连续且稳定地供暖,还具备发电能力来为电网灵活发电,具有一定的经济效益。该系统运行模式的分配为多能耦合下的核能供热提供了理论依据。

Research on nuclear heating is of great significance to the development of urban central heating in China.Compared with single nuclear heating reactor,the integrated energy system coupled with small-scale reactor and biomass unit improves the flexibility of load regulation and the economy of the reactor in terms of heating,but it brings many problems,such as complex system combination and various operation modes.In order to make the operation mode of the system meet the heat load demand and take into account the economy,the two operation modes of condensate extraction and back pressure of biomass unit,the number of start and stop of low-pressure cylinder and the number of operation of small reactor are studied and analyzed,and the six typical operation modes of the system and the corresponding thermal and electrical load characteristics are obtained.Moreover,the peak shaving capacity ratio of each mode is calculated according to the electric load range.Based on the heat load regulation range and peak shaving capacity ratio,the six modes are screened twice respectively to obtain the best operation mode.The results show that,when operating in the best mode,the integrated energy system can not only continuously and stably heat the heat supply network,but also have the power generation capacity to flexibly generate electricity for the power grid,which has certain economic benefits.The distribution of operation mode of the system provides a theoretical basis for nuclear heating under multi energy coupling.