针对某热电厂氨法烟气脱硫装置防腐蚀设计以及运行中的腐蚀现状, 分析了该装置的腐蚀原因。结果表明, 脱硫浆液中硫酸根离子、氯离子等对金属设备的酸腐蚀、颗粒物结晶腐蚀和机械冲刷磨损, 以及脱硫后低温湿烟气凝结成低浓度酸液对烟囱等设备的露点腐蚀是造成装置腐蚀的主要原因。提出了氨法脱硫装置防腐蚀对策, 主要包括合理选用防腐蚀设备材料; 严格按照防腐蚀施工工艺标准, 确保防腐蚀施工质量; 运行中严格控制引起腐蚀的因素, 降低设备腐蚀速率。

According to the anti-corrosion design and corrosion status of an ammonia flue gas desulphurization (FGD) device in a thermal power plant, the corrosion reasons of the FGD device were analyzed. The results showed that the acid corrosion induced by sulfate ions and chloride ions in desulphurization slurry, the particle crystallization corrosion and mechanical erosion, as well as the low concentration acid dew point corrosion of chimney and other equipment induced by low temperature wet flue gas after desulphurization were the main reasons. The preventive measures of ammonia FGD device were proposed, including reasonable selecting anticorrosion equipment and materials, raising anti-corrosion construction technology standards to ensure anticorrosion construction quality, and controlling corrosion factors in operation to retard the speed of device corrosion.