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一、引言我国炼油工业中的脱硫装置溶剂再生塔通常应用乙醇胺水溶液脱除进料中的酸性气体CO_2和H_2S。温度较低时,乙醇胺吸收酸性气体;温度升高时又重新放出所吸收的酸性气体,其可逆反应如下[1]: 2RNH_2+CO_2+H_2O(?)[(RNH_2)H]_2CO_3 2RNH_2+H_2S(?)[(RNH_2)H]_2S 反应式中R代表-OHCH_2CH_2。关于应用乙醇胺脱除酸性气体的详细工艺过程参看文献。由于乙醇胺和酸性气体构成的复杂环境和应力(包括焊缝残余应力)的联合作用,经常使再生塔高温塔段(塔内环境的温度为90～120℃,pH值为9～11)发生应力腐蚀开裂
First, the introduction of China’s oil refining industry desulfurization unit solvent regeneration tower is usually applied ethanolamine aqueous solution to remove the feed acid gas CO_2 and H_2S. Ethanolamine absorbs acid gas at a lower temperature, and re-releases the absorbed acid gas at an elevated temperature. The reversible reaction is as follows: [1]: 2RNH_2 + CO_2 + H_2O [(RNH_2) H] _2CO_3 2RNH_2 + H_2S ( ?) [(RNH_2) H] _2S where R represents -OHCH_2CH_2. For the detailed process of using ethanolamine to remove acid gas, see the literature. Due to the combined effect of the complex environment of ethanolamine and acid gas and the stress (including the residual stress of the weld), stress often occurs in the high-temperature tower section of the regeneration tower (the temperature in the tower environment is 90-120 ° C and the pH value is 9-11) Corrosion cracking