关键词: 火电厂, 锅炉停用保护, 保护剂, 十八胺, 表面活性胺, 水汽质量, 氢电导率

Abstract: 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.

Key words: thermal power plant, boiler lay-up protection, protective agent, octadecylamine, surface active amine, water and steam quality, cation conductivity