承钢高压锅炉腐蚀原因与对策

Corrosion cause and countermeasure of chenggang high-pressure boiler

承钢的2台高压锅炉主要用于向汽轮机供给蒸汽,蒸汽带动高炉风机运行并发电。运行一段时间后,2台高压锅炉出现蒸汽泄漏的现象,通过查找泄漏点,进行问题分析,提出用吗啉代替氨水调节pH,投加水合肼作为除氧剂,采用药剂连续投加方式,使用食品级磷酸三钠,安装混床处理冷凝水,将操作压力调回到9.5 MPa的解决方案。改进运行1 a后,锅炉运行良好,检修期间均未发现明显的腐蚀现象。

The purpose of chenggang’s two high pressure boilers is to supply steam to steam turbines,which drive blast furnace fans and generate electricity. After running for a period of time,the two boilers experienced steam leak- age. By finding the leakage point,the problem was analyzed and the following solutions were proposed,using morpho- line instead of ammonia to adjust pH,Adding hydrazine hydrate as deoxidizer,Continuous administration of drugs, using food grade trisodium phosphate,Installing the mixing machine to treat condensate water and setting the opera- ting pressure to 9.5 MPa. After one year’s improvement,the boiler operated well and no obvious corrosion was found during maintenance.