以空气作为加氧介质的全保护加氧处理安全性及经济性研究

Study on the Safety and Economy of Full Protection Oxygenation Treatment with Air as the Medium

加氧处理是目前超临界机组优选的化学水工况。以某电厂为例,研究了电厂使用全保护加氧设备进行加氧处理的安全性和经济性,结果表明,以空气作为加氧介质能够安全有效地抑制给水系统及高压加热器疏水系统的流动加速腐蚀,加氧前后蒸汽系统氧含量不变,不存在加氧促进氧化皮剥落的风险,安全性显著提高,且在加氧处理工况下,控制给水pH值为9.0左右,降低加氨量后大幅延长了精处理混床的运行周期和锅炉酸洗周期,获得了明显的经济效益。

Oxygenation treatment is currently the preferred chemical water condition for supercritical units.Taking a power plant as an example,the safety and economy of oxygenation treatment with full protection oxygenation equipment are studied.The results show that:with air as the oxygenation medium,the flow accelerated corrosion of the water supply system and the high-pressure heater drainage system can be safely and effectively inhibited.The oxygen content of steam system remains unchanged before and after oxygenation,and there is no risk that adding oxygen will promote peeling off of oxide skin.Therefore,the safety is significant.In addition,the pH value of the feed water is controlled to be about 9.0 under the oxygenation treatment condition,and the operation cycle of the fine treatment mixed bed and boiler pickling cycle are greatly extended after the amount of ammonia added is reduced,which brings about obvious economic benefits.