摘要
针对某660MW超超临界二次再热机组,提出通过一次和二次高再冷段抽汽高温熔盐储能和高温熔盐换热器替代高压加热器的放热来提高二次再热机组运行灵活性方案。论文模拟仿真了高温熔盐储能系统在100%THA工况储热和放热过程对二次再热机组锅炉和汽轮机负荷响应特性,以及系统的热力性能变化。研究结果表明,储热过程能够提高的最大调峰量为6.82%Pe,负荷相应时间缩短600s;放热过程最大调峰量为1.82%Pe,负荷相应时间缩短1800s,能够有效改善二次再热机组响应速度。在储热和释热过程中,100%THA过程中,蓄热过程中的爬坡率为6.82%Pe,而在热释放过程中的爬坡率为1.82%Pe,分别显著提高了机组负荷爬坡率。研究结果表明,高温熔盐蓄热系统可以提高二次再热机组对电网负荷相应速率。
For a 660 MW ultra-supercritical double reheat power generation unit,a high-temperature molten salt energy storage system was proposed to store the high-temperature steam extraction at the primary and secondary reheater cold sections and release the thermal energy through a high temperature feed water and molten salt heater in order to improve the flexibility of the double reheat power generation unit.Simulation on the high-temperature molten salt thermal energy storage system during thermal energy storage from steam extraction and release of molten salt thermal energy to the feed water heater is conducted to present the load response and thermal performance characteristics in the double reheat boiler and the steam turbine under 100%THA.The maximum peaking output could reach at 45 MW during the thermal storage process and the corresponding load time is shortened by 600 s;the maximum peaking output could reach at 12 MW during the thermal release process and the corresponding load time is shortened by 1800 s,which can effectively improve the load response of the double reheat power generation unit.The ramp rate reaches at 6.82%Pe during thermal energy charging process and 1.82%Pe during the thermal discharging process at 100%THA,which significantly improves the load responding to power grid.The research results show that the high-temperature molten salt thermal storage system can improve the flexibility of double reheat power generation units.
作者
庞力平
张世刚
段立强
PANG Liping;ZHANG Shigang;DUAN Liqiang(Key Laboratory of Power Station Energy Transfer Conversion and System(North China Electric Power University),Changping District,Beijing 102206,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第8期2682-2690,共9页
Proceedings of the CSEE
基金
国家重点研发计划项目(2017YFB0602101)
河北省应用基础研究计划重点基础研究项目(13964306D)。
关键词
二次再热锅炉
高温熔盐
储能
灵活性
自动发电控制
double reheat boiler
high temperature molten salt
energy storage
flexibility
AGC
