【摘要】：雜散電流主要形成局部腐蝕,管道流入雜散電流的一段被稱為陰極,流出的部分被稱為陽極。一般在陽極區(qū)會(huì)發(fā)生金屬的腐蝕,如果破損部分沒有被及時(shí)發(fā)現(xiàn),長期的腐蝕會(huì)造成管道穿孔,造成不可估量的嚴(yán)重事故。直流雜散電流的危害遠(yuǎn)遠(yuǎn)高于交流雜散電流,本文主要研究直流雜散電流對(duì)埋地金屬管道的影響。本論文采用數(shù)值模擬方法加入到雜散電流腐蝕的研究中,用COMSOL Mulitiphysics軟件中的腐蝕模塊進(jìn)行研究,用物理模擬進(jìn)行驗(yàn)證。本文的研究內(nèi)容如下:(1)本文首先研究了不同的二維模型,研究了單根管道模型、平行管道模型及垂直管道模型,得出用犧牲陽極的方法可以保護(hù)管道,未受管道模型的模型電解質(zhì)電勢為0 V-1 V左右,保護(hù)管道的電勢降到了負(fù)值,得到了保護(hù)。(2)本文用數(shù)值模擬的方法分別研究了三維模型單根管道模型、平行管道模型、互成度角管道的模型模型,分別對(duì)它們進(jìn)行了相應(yīng)的陰極保護(hù)研究,隨著土壤電導(dǎo)率的增大電解質(zhì)電勢呈現(xiàn)增大的趨勢說明土壤電導(dǎo)率增大促進(jìn)腐蝕,隨著外電壓的增大電解質(zhì)電勢呈現(xiàn)增大的趨勢說明外電壓也可以促進(jìn)腐蝕�？梢圆扇∠鄳�(yīng)的措施減少外電壓及選擇土壤電導(dǎo)率較小的地方進(jìn)行施工。電解質(zhì)電勢隨著外電壓的增大而增大;不同的埋設(shè)角度不會(huì)影響電解質(zhì)電勢的數(shù)值,對(duì)電解質(zhì)電勢的趨勢會(huì)有一定影響。(3)實(shí)驗(yàn)對(duì)驗(yàn)證數(shù)值模擬具有重要的作用,實(shí)驗(yàn)?zāi)M的結(jié)果與數(shù)值模擬的出的結(jié)果基本上是一致的,采用雜散電流收集網(wǎng)和排流的措施可以有效減小雜散電流腐蝕,其中極性排流能使電勢降到-0.85 V以下,對(duì)管道有很好的保護(hù)效果。
[Abstract]:Stray current mainly forms local corrosion. A section of stray current is called cathode and the outflow part is called anode. Generally, metal corrosion occurs in the anode area. If the damaged part is not found in time, long term corrosion will lead to pipeline perforation, resulting in incalculable serious accident. The harm of DC stray current is much higher than that of AC stray current. The effect of DC stray current on buried metal pipeline is studied in this paper. In this paper, numerical simulation method is applied to the study of stray current corrosion, and the corrosion module in COMSOL Mulitiphysics software is used to study it, and the physical simulation is used to verify it. The main contents of this paper are as follows: (1) in this paper, different two-dimensional models are studied, including single pipe model, parallel pipeline model and vertical pipeline model. It is concluded that sacrificial anode can be used to protect pipeline. The electrolyte potential of the model without the pipeline model is about 0 V -1 V, and the potential of the protection pipe is reduced to negative value. (2) in this paper, the single pipe model and the parallel pipe model of the three dimensional model are studied by numerical simulation. The corresponding cathodic protection studies were carried out on the models of interdependency angle pipes. With the increase of soil conductivity, the electrolyte potential showed an increasing trend, which indicated that the increase of soil conductivity promoted corrosion. The electrolyte potential increases with the increase of external voltage, indicating that external voltage can also promote corrosion. The corresponding measures can be taken to reduce the external voltage and select the places where the soil conductivity is low. Electrolyte potential increases with the increase of external voltage, and different embedding angles will not affect the value of electrolyte potential, but will have a certain effect on the trend of electrolyte potential. (3) experiments have an important role in the verification of numerical simulation. The results of experimental simulation are basically consistent with those of numerical simulation. The stray current corrosion can be effectively reduced by using stray current collection network and drain current, in which the polarity drain can reduce the potential below -0.85 V. It has a good protective effect on the pipeline.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG174

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本文編號(hào)：2199787