超临界机组汽水系统腐蚀产物迁徙过程研究

doi:10.11902/1005.4537.2016.011

中国腐蚀与防护学报

2016, Vol. 36

Issue (4): 343-348 DOI: 10.11902/1005.4537.2016.011

研究报告

本期目录 | 过刊浏览

超临界机组汽水系统腐蚀产物迁徙过程研究

蒋东方¹,白杨²,朱忠亮¹,张乃强¹(

),肖卓楠¹,徐鸿¹

1. 华北电力大学电站设备状态监测与控制教育部重点实验室北京 102206
2. 宁夏电力公司电力科学研究院银川 750001

Moving Process of Corrosion Products in Steam-water System of Supercritical Power Units

Dongfang JIANG¹,Yang BAI²,Zhongliang ZHU¹,Naiqiang ZHANG¹(

),Zhuonan XIAO¹,Hong XU¹

1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China
2. Electric Power Research Institute of Ningxia Electric Power Corporation, Yinchuan 750001, China

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摘要:

从汽水系统腐蚀产物迁徙过程入手,探讨了超临界机组汽水系统腐蚀产物的来源,即低压加热器和高压加热器等部件发生流动加速腐蚀产生大量腐蚀产物,进入工质随工质进行迁徙。由于工质物性参数的变化,腐蚀产物溶解度降低,大量腐蚀产物沉积在高温管道。研究发现,炉管氧化皮的生成一方面来源于自身高温氧化,另一方面来自腐蚀产物沉积。结果表明,汽水系统不同部件内腐蚀形式不同,可以通过提高给水品质来抑制腐蚀产物迁徙对机组的影响,保证机组安全稳定运行。

关键词 ：超临界机组, 汽水系统, 腐蚀产物, 离子迁徙

Abstract：

The explosion of boiler tubes induced by the oxide scale causes a great influence on the safety and economy of power plants. The source of corrosion products in supercritical power plants is analyzed based on the physical and chemical properties of supercritical water, while the moving process of corrosion products can be described as follows: the corrosion products generated in the low pressure heaters and high pressure heaters, and then they are moving with the water. As the solubility of the corrosion products in the water was changed, which depended on both the pH and temperature, therewith the corrosion products deposit on the high temperature tubes. It follows from the analysis that the oxide scales on the boiler wall seem to be from two origins: the one is the high temperature corrosion of the tube wall itself, the other one is the deposition of corrosion products from upstream. Furthermore, the effect of the moving of corrosion products on the operation of power unit may be modified by properly inducing feed water of high quality in the steam-water system, thereby to ensure the safe and stable operation of the supercritical power unit.

Key words： supercritical unit steam-water system corrosion product transport process

基金资助:国家自然科学基金项目 (51471069),北京市自然科学基金项目(2152029)和中央高校基本科研业务费专项资金项目(2015ZD005) 资助

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引用本文:

蒋东方,白杨,朱忠亮,张乃强,肖卓楠,徐鸿. 超临界机组汽水系统腐蚀产物迁徙过程研究[J]. 中国腐蚀与防护学报, 2016, 36(4): 343-348.
Dongfang JIANG, Yang BAI, Zhongliang ZHU, Naiqiang ZHANG, Zhuonan XIAO, Hong XU. Moving Process of Corrosion Products in Steam-water System of Supercritical Power Units. Journal of Chinese Society for Corrosion and protection, 2016, 36(4): 343-348.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.011 或 https://www.jcscp.org/CN/Y2016/V36/I4/343

图1 某超临界机组汽水系统流程图

图2 金属腐蚀机理

图3 腐蚀产物迁徙过程示意图

图4 水的介电常数和密度随工质温度和压力的变化

图5 离子积随工质温度和压力的变化

图6 Fe溶解度随温度和pH值变化曲线

图7 汽水系统腐蚀行为趋势图

图8 汽水系统Fe2+含量变化

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