开架式气化器换热管腐蚀影响因素分析

目前,开架式气化器换热管的长效防护措施是在其表面制备铝及其合金的涂层。由于长期置于海洋环境下,换热管表面的铝基涂层会出现点蚀、鼓包、脱落及厚度减薄现象,可能危及设备安全高效运行。通过分析影响开架式气化器换热管腐蚀的因素,如海水含沙量、海水流速、离子种类、海水PH值等,这对换热管的腐蚀机理研究、防护层寿命评估、设备使用状态的监控及日常运行维护提供一定的理论支撑。

Corrosion Factor Analysis of Heat Exchange Tubes of Open Rack Vaporizer

At present, the long-term protection measure for the heat exchange tubes of open rack vaporizers (ORV) is to prepare aluminum and its alloy coatings on their surfaces. Due to the long-term exposure to the marine environment, the aluminu-mbased coating on the surface of the heat exchange tube will appear pitting, bulging, shedding, and thinning, which may threaten the safe and efficient operation of the equipment. Here, the factors that affect the corrosion of ORV heat exchange tubes are analyzed, such as sand content of seawater, flow rate of seawater, ion species, and PH value of seawater, etc. The results can provide certain theoretical support for the corrosion mechanism research, life evaluation of protection layer, equipment status monitoring, and daily operation and maintenance of the heat exchange tubes.