储能科学与技术 ›› 2021, Vol. 10 ›› Issue (5): 1760-1767.doi: 10.19799/j.cnki.2095-4239.2021.0230

• 物理储能十年专刊·储热 • 上一篇    下一篇

应用于火电机组深度调峰的百兆瓦级熔盐储能技术

王辉(), 李峻(), 祝培旺, 王坚, 张春琳   

  1. 中国电力工程顾问集团中南电力设计院有限公司,湖北 武汉 430064
  • 收稿日期:2021-05-27 修回日期:2021-06-27 出版日期:2021-09-05 发布日期:2021-09-08
  • 通讯作者: 李峻 E-mail:wanghui@csepdi.com;lijun@csepdi.com
  • 作者简介:王辉(1970—),男,教授级高工,从事电力工程设计咨询工作和热能动力技术研究,E-mail:wanghui@csepdi.com

Hundred-megawatt molten salt heat storage system for deep peak shaving of thermal power plant

Hui WANG(), Jun LI(), Peiwang ZHU, Jian WANG, Chunlin ZHANG   

  1. China Power Engineering Consulting Group Zhongnan Electric Power Design Institute Co. Ltd. , Wuhan 430064, Hubei, China
  • Received:2021-05-27 Revised:2021-06-27 Online:2021-09-05 Published:2021-09-08
  • Contact: Jun LI E-mail:wanghui@csepdi.com;lijun@csepdi.com

摘要:

为提高电力系统灵活性电源占比,解决新能源消纳问题,本研究提出百兆瓦级熔盐储能技术,在火电机组热力系统中的“锅炉-汽机”之间,嵌入大容量高温熔盐储热系统,实现热电解耦。研究表明,百兆瓦级熔盐储能技术,可使汽机按照最低出力运行,同时保证锅炉安全运行且不停炉,大幅度增加火电机组深度调峰能力。在保证锅炉安全性和盐水换热器制造能力条件下,储热系统设计较高的主蒸汽压力和较高的过冷高压水温度,能有效提高熔盐储热过程热熔盐温度和减少熔盐使用量,达到降低熔盐储能初投资的目的。对百兆瓦级熔盐储能技术各模块进行理论计算,结果表明,系统综合效率高达77.8%,在大规模储能领域具有广泛的应用前景。

关键词: 储能, 高温储热, 深度调峰, 熔盐

Abstract:

To increase the flexibility of the power system and the consumption of energy, a 100 MW molten-salt heat storage system is proposed herein. The molten-salt heat storage system with a large capacity and high temperature was embedded between the boiler and turbine in a thermal power system of a thermal power unit to decouple thermal and electric energy. The 100 MW molten-salt heat storage system could enable the turbine to operate at the lowest output while ensuring the safe operation of the boiler without stopping it, thereby greatly increasing the deep peak-shaving capacity of the thermal power unit. To ensure the safety of the boiler and the manufacturing ability of the salt-water heat exchanger, the heat storage system is designed with high main steam pressure and high subcooled high-pressure water temperature. It can effectively increase the temperature of the hot molten salt and reduce the amount of molten salt, reducing the initial investment capital of molten-salt energy storage systems. The theoretical calculation of each module of the 100 MW molten-salt heat storage technology shows that the comprehensive storage efficiency of the system is as high as 77.8%; thus, it has broad application prospects in large-scale energy storage.

Key words: energy storage, high temperature heat storage, deep peak shaving, molten salt

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