Mal-conditions, unsuitable material chosen, too heavy production load, inferior quality of manufacture and irrational structure are the main causes for corrosion to occur in the secondary evaporator-heater.

• 摘要工况恶劣、选材不当、生产负荷偏大、制造质量不佳和结构不合理是造成二段蒸发加热器发生腐蚀的主要原因。