溫度和湍流對Cr合金鋼環(huán)烷酸腐蝕的影響
發(fā)布時間:2019-02-14 08:10
【摘要】:對環(huán)烷酸腐蝕控制機制分析推測高溫高流速下lnv與(-1/T)間的規(guī)律。對API581中Cr合金鋼的腐蝕數(shù)據(jù)進行分析及模擬實驗。結(jié)果表明:lnv-(-1/T)之間存在線性規(guī)律,應(yīng)用lnv-(-1/T)線性規(guī)律可以較準(zhǔn)確預(yù)測不同溫度下Cr合金鋼的平均環(huán)烷酸腐蝕速率。根據(jù)Fluent模擬得到不同條件下腐蝕試樣表面的湍流分布,將試樣表面湍流分布與表面3D腐蝕深度關(guān)聯(lián)后可明確湍流強度會顯著影響局部腐蝕深度。在2%弱湍流區(qū),局部最大腐蝕深度與總平均腐蝕深度比值僅為1.56,但在8%湍流強度下,兩者比值可大于3.7,影響程度隨湍流強度的增加呈曲線快速提高。
[Abstract]:The control mechanism of naphthenic acid corrosion is analyzed and the relationship between lnv and (-1 / T) at high temperature and high flow rate is deduced. The corrosion data of Cr alloy steel in API581 were analyzed and simulated. The results show that there is a linear rule between lnv- (-1 / T) and the average naphthenic acid corrosion rate of Cr alloy steel at different temperatures can be predicted accurately by using lnv- (-1 / T) linear law. According to the Fluent simulation, the turbulent distribution on the surface of the corroded specimen under different conditions is obtained. When the turbulent distribution on the surface of the sample is correlated with the depth of 3D corrosion on the surface, it is clear that the turbulence intensity will significantly affect the local corrosion depth. The ratio of the local maximum corrosion depth to the total average corrosion depth is only 1.56 in the weak turbulent region of 2%, but the ratio can be greater than 3.7 when the turbulence intensity is 8%, and the influence degree increases rapidly with the increase of the turbulence intensity.
【作者單位】: 安徽工業(yè)大學(xué)機械工程學(xué)院;合肥通用機械研究院;
【基金】:“十二五”國家科技支撐計劃資助項目(2011BAK06B03) 863計劃資助項目(2012AA040103) 安徽工業(yè)大學(xué)優(yōu)秀創(chuàng)新團隊資助項目(000452)
【分類號】:TG172
[Abstract]:The control mechanism of naphthenic acid corrosion is analyzed and the relationship between lnv and (-1 / T) at high temperature and high flow rate is deduced. The corrosion data of Cr alloy steel in API581 were analyzed and simulated. The results show that there is a linear rule between lnv- (-1 / T) and the average naphthenic acid corrosion rate of Cr alloy steel at different temperatures can be predicted accurately by using lnv- (-1 / T) linear law. According to the Fluent simulation, the turbulent distribution on the surface of the corroded specimen under different conditions is obtained. When the turbulent distribution on the surface of the sample is correlated with the depth of 3D corrosion on the surface, it is clear that the turbulence intensity will significantly affect the local corrosion depth. The ratio of the local maximum corrosion depth to the total average corrosion depth is only 1.56 in the weak turbulent region of 2%, but the ratio can be greater than 3.7 when the turbulence intensity is 8%, and the influence degree increases rapidly with the increase of the turbulence intensity.
【作者單位】: 安徽工業(yè)大學(xué)機械工程學(xué)院;合肥通用機械研究院;
【基金】:“十二五”國家科技支撐計劃資助項目(2011BAK06B03) 863計劃資助項目(2012AA040103) 安徽工業(yè)大學(xué)優(yōu)秀創(chuàng)新團隊資助項目(000452)
【分類號】:TG172
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