核岛蓄热能力及对一次调频的影响

Effects of Thermal Storage Capacity on the Primary Frequency Regulation of a Nuclear Island

为了分析核电机组核岛蓄热能力及对一次调频的影响,以国内某M310压水堆核电机组为例,对机组蒸汽发生器蓄热量、一次回路蓄热量及温度效应对蓄热的影响进行了理论分析及研究。在此基础上,利用能量守恒原理,建立了一、二次回路及核岛整体能量守恒方程,得到核岛蓄热计算模型,并利用理论方法计算得到蒸汽发生器和一次回路的蓄热系数及蓄热时间常数,同时利用核电配套仿真机仿真结果进行验证。结果表明:模型计算结果与仿真结果差别较小,满足工程计算的要求;由于温度效应的存在,核电机组具有强大的自稳性,从热量的表现形式上看,核电机组具有强大的蓄热能力,完全能够满足一次调频的能量需求。

To analyze the effects of thermal storage capacity on the primary frequency regulation of a nuclear island,a theoretical analysis was conducted on the steam generator(SG)heat storage,reactor coolant pump(RCP)heat storage and the temperature effect on the heat storage of a domestic M310 pressurized water reactor.On above basis,a heat storage calculation model was set up for the nuclear island by establishing an integral energy conservation equation for the primary circuit,secondary circuit and the nuclear island based on the principle of energy conservation,and subsequently the heat storage coefficient and time constant of the SG and RCP were calculated and verified with a matched simulator.It has been found that the model calculations are just slightly different from the simulation results,which satisfy the requirements of engineering calculations.Due to the existence of temperature effect,the nuclear power unit has a strong self-stability,indicating in the form of strong thermal storage capacity,which is completely able to meet the energy demand of primary frequency regulation.