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        電站燃油鍋爐腐蝕抑制劑的合成及作用機理
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        中國石油大學華東化學工程學院

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        O69

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        Synthesis and mechanism of corrosion inhibitors for power station oil- fired boilers
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        College of Chemical Engineering,China University of Petroleum East China

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          摘要:

          以硬脂酸、軟脂酸、油酸、環烷酸4種有機酸和活性MgO為主要原料,設計合成復合無機-有機酸鎂腐蝕抑制劑,考察使用性能,并對其作用機理進行探究。結果表明:復合碳酸鎂-環烷酸鎂腐蝕抑制劑具有較好的效果,加量為1000 μg/g時,煙氣中SO3含量降低了70.0%,鋼片腐蝕速率降低了21.6%。進一步分析表明,合成的產品是一種納米級MgCO3粒子在有機酸鎂膠束包裹下形成的穩定膠體體系,有效解決了MgCO3粒子在燃油中分散性差的問題,有利于發揮無機-有機鎂鹽的協同作用。隨著燃油燃燒,腐蝕抑制劑產生的MgO與燃油產生的V2O5結合,降低了V2O5的濃度,減弱了其對SO2向SO3轉化的催化作用,使煙氣中SO3含量降低,抑制了低溫腐蝕。同時,MgO的存在使燃燒生成的釩酸鹽種類由低熔點變為高熔點,高溫腐蝕得到緩解。

          Abstract:

          Composite inorganic-organic acid magnesium corrosion inhibitor was designed and synthesized with stearic acid, palmitic acid, oleic acid, naphthenic acid, and active magnesium oxide as the main raw materials. The application performance and mechanism were tested. The results show that the composite magnesium carbonate-magnesium naphthenate corrosion inhibitor has a good corrosion inhibition effect. When the dosage is 1000 μg/g, the sulfur trioxide content in flue gas is reduced by 70.0%, and the corrosion rate of the steel sheet is reduced by 21.6%. Further analysis shows that the synthesized product is a stable colloidal system. This colloidal system was formed by nanoscale magnesium carbonate particles encapsulated by organic acid magnesium micelles. This effectively solves the problem of poor dispersion of magnesium carbonate particles in fuel and facilitates the synergistic effect of inorganic-organic magnesium salts. As the fuel burns, vanadium pentoxide, which can catalyze the conversion of sulfur dioxide to sulfur trioxide, combines with magnesium oxide produced by the decomposition of corrosion inhibitors. The concentration of vanadium pentoxide decreased, so the content of sulfur trioxide in flue gas decreased, ultimately inhibiting low-temperature corrosion. At the same time, the presence of magnesium oxide makes the type of vanadate generated by combustion change from low melting point to a high melting point, which alleviates high-temperature corrosion.

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        生曉茹,賈超洋,張龍力,王芳珠,姜翠玉.電站燃油鍋爐腐蝕抑制劑的合成及作用機理[J].精細化工,2023,40(7):

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        歷史
        • 收稿日期:2022-10-02
        • 最后修改日期:2023-01-16
        • 錄用日期:2023-01-17
        • 在線發布日期: 2023-06-12
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