旁路蓄热对凝汽式机组调峰容量的影响

为研究熔盐蓄热技术对凝汽式机组调峰容量的影响，以660 MW超临界凝汽式机组为例，选择低熔点LMPS II熔盐为蓄热介质，将蓄热系统与汽轮机旁路系统相结合，构建3种旁路蓄热方案，应用EBSILON软件建立系统的仿真模型，研究凝汽式机组引入熔盐蓄热后调峰容量和调峰容量补偿的变化。结果表明：整机旁路蓄热方案可以使机组发电负荷率降得最低；在蓄热时长相同的条件下，低压旁路蓄热方案放热顶峰运行时间最长；以30%发电负荷率作为起始蓄热工况，旁路蓄热方案的调峰容量增加3.21%～6.42%；在蓄热起始工况发电负荷率较低时，机组的调峰容量补偿较大。

A Study on Influence of the Bypass Heat Storage on the Peak Shaving Capacity of the Condensing Unit

In order to study the influence of the molten salt heat storage technology on the peak shaving capacity of the condensing unit， a 660MW supercritical condensing unit is taken as an example in this paper. Using LMPS II as the heat storage medium， the heat storage system is combined with the turbine bypass system to construct three bypass heat storage schemes. The EBSILON software is used to establish the simulation model of the system to study the changes of the peak shaving capacity and its compensation of the condensing unit after the molten salt heat storage is adopted. The results show that the whole bypass heat storage scheme can minimize the power generation load rate of the unit.Under the same heat storage duration， the low-pressure bypass heat storage scheme has the longest peak heat release operation time.Taking a 30% power generation load rate as the initial heat storage condition， the peak shaving capacity of the bypass thermal storage scheme increases by approximately 3.21%-6.42%.When the power generation load rate is low at the initial condition of heat storage， the peak shaving capacity compensation of the unit is relatively large.