渣油加氢反应器加热炉炉管腐蚀特性研究

Research on corrosion characteristics of heating furnace tube in residue hydrogenation reactor

渣油加氢反应器加热炉炉管在高温、高压和腐蚀性环境中容易受到腐蚀,采用挂片实验的方法研究了加热炉燃料气中不同组分变化对炉管腐蚀速率的影响,并提出了缓解腐蚀的措施。结果表明:钢材腐蚀速率随H_(2)S分压的升高整体上逐渐升高,并趋于平稳,随CO_(2)分压的升高呈现先降低后升高的趋势,系统腐蚀以H_(2)S为主,系统总压力对腐蚀速率的影响不大,Cl^(-)含量增加对腐蚀速率的影响较大。在加热炉燃料气进气前,应对燃料气进行预先处理,控制H2S、CO_(2)的含量,并尽量脱除水蒸气中的Cl^(-),可以有效缓解钢材腐蚀。

The heating furnace tubes of residue hydrogenation reactor were prone to corrosion in the high temperature,high pressure and corrosive environments.The influence of different component changes in the fuel gas of the heating furnace on the corrosion rate of the furnace tubes was studied using the coupon experiment method,and measures to alleviate corrosion were proposed.The results showed that the corrosion rate of steel gradually increased with the increase of H2S partial pressure and then tended to stabilize.It showed a trend of first decreasing and then increasing with the increase of CO_(2) partial pressure.H_(2)S was the main corrosion factor in the system,and the total pressure of the system had little impact on the corrosion rate.The increase of Cl^(-) content had a greater impact on the corrosion rate.Before feeding the fuel gas into the heating furnace,pre-treatment should be carried out to control the content of H_(2)S and CO_(2),and to remove Cl^(-)from the water vapor as much as possible,which could effectively alleviate steel corrosion.