摘要
为提高燃煤机组的调峰能力、促进可再生能源大规模消纳,该文提出一种燃煤机组耦合蒸汽-烟气逐级加热熔盐储热系统,以实现机组深度调峰。以某1 100 MW机组为研究对象,使用EBSILON软件建立仿真模型,并对来自热源的热量进行热负荷分配,研究不同热负荷分配比例下该系统的储热性能、输出功率、煤耗率、脱硝效率以及㶲效率的变化规律。结果表明:该耦合系统可将机组的最低电负荷从额定负荷的40%降低至21.14%,等效往返效率最高为69.71%;储、释能过程的最低煤耗率分别为488.33和230.82 g/(kW·h);低负荷下脱硝设备入口烟气平均温度提高41.5℃,脱硝效率提升10.88%;储能工况下各系统㶲效率变化幅度在2%以内;释能工况下锅炉㶲效率最高为62.98%、释能系统㶲效率高达88.49%。可知,所提出的构型具有调峰能力强、低负荷脱硝效率高、㶲损失低等优势,为燃煤机组的储能改造提供了参考。
To enhance the peak shaving of coal-fired power plants and promote the large-scale consumption of renewable energy,this work proposes a coal-fired power plant coupled steam-flue gas stepwise heating molten salt thermal storage system,which extracts flue gas and main steam as heat sources to achieve deep peak shaving.In this study,an 1 100 MW power plant is taken as the research object.The simulation model is established by using EBSILON software,and the thermal load distribution from the heat source is carried out.The thermal storage properties,output power,coal consumption rate,denitration efficiency,and exergy efficiency of the coupling system with different thermal load distribution ratios are studied.The results show that the system can reduce the minimum electric load of the power plant from 40%to 21.24%of the rated load,with the highest equivalent round-trip efficiency of 69.71%.The minimum coal consumption rates in charging and discharging processes are 488.33 and 230.82 g/(kW·h),respectively.Under a low load,the average temperature of denitration equipment inlet flue gas is increased by 41.5℃,and the denitration efficiency is increased by 10.88%.Under energy storage condition,the exergy efficiency of each system varies within 2%.Under energy release condition,the exergy efficiency of the boiler and the energy release system reaches up to 62.98%and 88.49%.In general,the proposed configuration has the advantages of strong peak shaving ability,high denitration efficiency and low exergy loss under low load,which provides a reference for the energy storage transformation of coal-fired power plants.
作者
景浩
王登亮
陈禄
王朝阳
陈伟雄
赵永亮
严俊杰
JING Hao;WANG Dengliang;CHEN Lu;WANG Chaoyang;CHEN Weixiong;ZHAO Yongliang;YAN Junjie(State Key Laboratory of Multiphase Flow in Power Engineering(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China)
出处
《中国电机工程学报》
北大核心
2025年第17期6817-6827,I0017,共12页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
国家重点研发计划项目(2022YFB4100401)。
关键词
熔盐储热
燃煤机组
深度调峰
热负荷分配
molten salt thermal storage
coal-fired power plants
deep peak shaving
thermal load distribution
