锅炉停用保护剂对水汽氢电导率的影响研究

电站锅炉停用保护剂多采用十八胺和表面活性胺。对这2种停用保护剂进行了应用效果对比研究，即对湿冷机组、空冷机组采用十八胺或表面活性胺、有无凝结水精处理系统等6台机组停机和启动过程中给水、主蒸汽和凝结水的氢电导率变化情况进行分析。研究结果表明：在停机过程和启动过程，2种保护剂均会在水汽系统中发生部分分解，导致水汽系统的氢电导率显著升高；表面活性胺和十八胺比较，使用前者，机组启停机过程可保持凝结水精处理系统正常投运，因而可使水汽质量迅速达标，对机组安全运行有利，因此推荐采用表面活性胺作为锅炉停用保护剂。

Effects of Lay-Up Protective Agent on Water and Steam Cation Conductivity

Octadecylamine and surface active amine are generally used as protective agents in boiler lay-up protection. In this paper, the comparative study on the application effects of the two kinds of protective agents is conducted, namely on the changes of main steam and condensate water hydrogen conductivity in wet unitsair-cooled units, and the units with or without condensate polishing treatment system that adopt octadecylamine or surface active amine protection agents during startup and shutdown. The results show that both kinds of protective agents are partly decomposed in the water and vapor system in the process of shutdown and startup, which causes significant increase of the hydrogen conductivity of the water and vapor system. In comparison with the octadecylamine agent, the surface active amine agent can maintain the normal commissioning of the condensate polishing system in the unit startup and shutdown processes so that the water and steam quality can meet the standards quickly and ensure secure operation. Therefore, the surface active amine agent is recommended as the boiler lay-up protective agent.