发电技术 ›› 2018, Vol. 39 ›› Issue (6): 561-565.DOI: 10.12096/j.2096-4528.pgt.18221

• 新能源 • 上一篇    下一篇

三元混合氯化盐NaCl-KCl-MgCl2对合金的腐蚀特性实验研究

赵峥峥1(),王遥2(),刘斌1,魏高升2()   

  1. 1 百吉瑞(天津)新能源有限公司, 天津市 空港经济区 300300
    2 电站设备状态监测与控制教育部重点实验室(华北电力大学), 北京市 昌平区 102206
  • 收稿日期:2018-10-12 出版日期:2018-12-31 发布日期:2018-12-28
  • 作者简介:赵峥峥(1990),女,工程师,主要从事熔盐储能等领域的研究工作, zhaozhengzheng973@163.com|王遥(1993),男,硕士研究生,主要从事太阳能热发电及储热等方面的研究工作, 15152119593@163.com|魏高升(1975),男,教授,博士生导师,主要从事火电机组节能、热物性测试技术、太阳能热发电等领域的研究工作, gaoshengw@126.com
  • 基金资助:
    国家重点研发计划项目(2017YFB061804)

Experimental Study on Corrosion Characteristics of Ternary Mixed Chloride Salt NaCl-KCl-MgCl2

Zhengzheng ZHAO1(),Yao WANG2(),Bin LIU1,Gaosheng WEI2()   

  1. 1 Bai Ji Rui(Tianjin) New Energy Co., Ltd., Konggang Economic Zone, Tianjin 300300, China
    2 Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education(North China Electric Power University), Changping District, Beijing 102206, China
  • Received:2018-10-12 Published:2018-12-31 Online:2018-12-28
  • Supported by:
    National Key Research & Development Plan of China(2017YFB061804)

摘要:

熔盐是目前太阳能热电站中应用最广泛的储热蓄热材料。为满足太阳能热发电系统对于熔盐的储热需求,该文将304、316L、321、310S不锈钢置于550℃的三元混合氯化盐NaCl-KCl-MgCl2(7:1:2)体系中,开展混合熔盐的腐蚀特性实验研究,并探讨其中的腐蚀机理。研究结果表明,在三元混合氯化盐NaCl-KCl-MgCl2(7:1:2)体系中,310S表现出较好的耐腐蚀性能,304的耐腐蚀性较差。MoO3、NiO、TiO2氧化物的生成可提高316L、310S、321不锈钢的耐腐蚀性能;混合氯化盐在高温下生成的Cl2是不锈钢腐蚀的重要原因,外部空气中的O2和H2O会进入熔盐侧与合金发生反应,加剧腐蚀。

关键词: 太阳能, 熔盐, 氯化盐, 腐蚀, 不锈钢

Abstract:

Molten salt is the most widely used heat storage material in solar thermal power stations currently. In order to meet the heat storage requirements of the solar thermal power generation system for molten salt, four stainless steels of 304, 316L, 321 and 310S were placed in the ternary mixed chlorinated salt NaCl-KCl-MgCl2(7:1:2) system at 550℃ to study corrosion characteristics and explore corrosion mechanisms. The research results indicate that 310S shows good corrosion resistance and 304 shows poor corrosion resistance in the NaCl-KCl-MgCl2 (7:1:2) system of ternary mixed chlorinated salts. The formation of MoO3, NiO and TiO2 oxides can improve the corrosion resistance of 316L, 310S and 321. The Cl2 produced by mixed chloride salts at high temperature is an important cause of corrosion of stainless steel, O2 and H2O in the outside air will infiltrate into the molten salt and react with the alloy to accelerate the corrosion.

Key words: solar energy, molten salt, chloride, corrosion, stainless steel