油田热电厂注汽锅炉炉管腐蚀因素分析与控制措施

Corrosion Factors Analysis and Control Measures of Boiler Tubes in Steam Injection Boiler in the Oilfield

大庆油田热电厂注汽锅炉炉管处于高温、高压的恶劣环境工况,腐蚀严重,其腐蚀类型主要为碱腐蚀、溶解氧腐蚀、气蚀、汽水腐蚀和停炉腐蚀。由介质产生的腐蚀因素主要有温度、流速及水处理质量;注汽锅炉炉管中存在的氧气以及锅炉水中溶解的氧加速了炉管腐蚀速率。为延缓腐蚀并减小腐蚀程度,提出以下对应的控制措施:严把水质源头管控,杜绝出现不达标水质进入锅炉;完善运行参数,防止超温、超压环境出现;将多种除氧方法结合使用,以达到最佳除氧效果。停炉后采用TH901法在炉管表面形成保护膜以隔离氧气,该保护法加药量少,成本低,阻止腐蚀的概率达到99.9%以上。通过控制锅炉给水水质,减少锅炉接触氧几率等措施,减缓了注汽锅炉炉管的腐蚀。

The steam injection boiler furnace tube ofDaqing oilfield thermal power plant is in high temperature, high pressure and other harsh environmental conditions. The corrosion types are mainly alkali corrosion, dissolved oxygen corrosion, cavitation erosion, steam water corrosion and stop furnace corrosion. The corrosion factors produced by the medium mainly include temperature, flow rate and water treatment quality. The dissolved oxygen in the oxygen, and the boiler water in the steam injection boiler furnace, that have accelerated the corrosion rate of the furnace tubes. On the basis of corrosion factors targeted research, from the control of boiler feed water quality, reduce boiler oxygen exposure probability and improve the furnace pipe anti-corrosion properties of the essence, four aspects： the use of science and technology, and puts forward the corresponding control measures, aiming to delay and reduce the corrosion of all aspects, to prevent corrosion of the probability of more than 99.9%. By controlling the water quality of boiler and reducing the chance of-contact with oxygen, the corrosion ofboiler tubes is reduced.