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核电厂二回路系统有机胺应用研究

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降低核电厂二回路系统设备管道腐蚀和减少腐蚀产物进入蒸汽发生器,对维持二回路安全运行和蒸汽发生器可靠性具有重要意义.运行核电厂二回路设备管道的金属腐蚀程度主要取决于其所在部位运行温度下的pH值即pHt值,以提高二回路系统所有部位pHt值为目标,分析主要有机胺吗啉、乙醇胺、3-甲氧基丙胺、二甲胺等及其组合的性能特征,并结合这些有机胺的应用经验,探讨了主要有机胺及其组合的应用原则.对目前国内二回路有机胺的应用现状提出了改进建议:选择有机胺或其组合时应计算二回路各部位的pHt值是否满足设备管道防腐要求,同时评估对系统树脂床运行时间的影响;碱性较强挥发性低的乙醇胺适用于二回路腐蚀产物主要来自高温疏水且凝结水精处理需要连续运行的电厂,3-甲氧基丙胺则因其碱性强挥发性适中使用范围较为广泛,吗啉因碱性较弱挥发性适中适用于凝结水精处理非连续运行的电厂,二甲胺和氨因其挥发性高适合和其他碱化剂组合使用,碱化剂组合使用可以在设备管道防腐和树脂床运行周期方面体现出更多的优势.
Organic amines application research in secondary cycle of nuclear power plant
In order to ensure safe operation of secondary cycle and reliability of steam generator,it is of great significance to reduce corrosion of equipment&piping of the cycle in nuclear power plant.With the deepening research on organic amines and the continuous accumulation of operation experience,the industry realized that the metal corrosion in the cycle during plant operation depends mainly on the pH at the operating temperature of locations of the cycle,i.e.pHt.To improve pHt at the locations of the cycle,performance characteristics of the main organic amines and their combinations are analyzed in this paper.Combined with the application experience and actual effects of organic amines at home and abroad,the application strategy of the main organic amines and their combinations are discussed and proposed,and the improvement suggestions are put forward with regard to current amine application status of the secondary cycle in China.Selections of amine or its combination should calculate the pHt at various locations to meet anti-corrosion requirements and evaluate effects on service life of resin beds in the system.Ethanolamine with stronger basicity and low volatility is suitably used in plant in which corrosion product is mainly from drain systems and condensate polishers are in continuous operation.3-methoxyypropyl with strong basicity and moderate volatility can be used in most plants.Morpholine with weaker basicity and moderate volatility is suitably used in plants in which polishers are not in continuous operations.Dimethylamine and ammonia are suitably used with other amines because of their high volatility.Amine mixture application appears advantages on aspects of the anti-corrosion and service life of the resin beds.

organic aminessedimentflow accelerated corrosionpHt valueresin

游兆金、沈亚芳、卢叶艇

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中核核电运行管理有限公司,浙江 嘉兴 314300

有机胺 沉积物 流动加速腐蚀 pHt值 树脂

2024

热力发电
西安热工研究院有限公司,中国电机工程学会

热力发电

CSTPCD北大核心
影响因子:0.765
ISSN:1002-3364
年,卷(期):2024.53(3)
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