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.