本文選題：環(huán)烷酸腐蝕 + 溫度��； 參考：《安徽工業(yè)大學(xué)》2015年碩士論文

【摘要】：環(huán)烷酸腐蝕是煉制劣質(zhì)原油過程中存在于煉制裝置中的一種常見腐蝕形式,是煉制高酸原油過程中亟待解決的問題。盡管高酸原油煉制企業(yè)大部分已進(jìn)行設(shè)備適應(yīng)性改造、工藝改進(jìn)、添加緩蝕劑或采用混煉等方式以降低腐蝕,但在彎頭、三通、泵等存在高速湍流的區(qū)域環(huán)烷酸腐蝕依然嚴(yán)重。因此對(duì)環(huán)烷酸腐蝕規(guī)律進(jìn)行研究對(duì)煉油裝置結(jié)構(gòu)設(shè)計(jì)、壽命預(yù)測及長周期安全運(yùn)行具有現(xiàn)實(shí)意義。本文通過高溫高流速下的環(huán)烷酸腐蝕試驗(yàn),測得了不同溫度、流速等條件下的環(huán)烷酸腐蝕速率。其次通過對(duì)腐蝕試驗(yàn)數(shù)據(jù)整理分析明確了溫度對(duì)環(huán)烷酸腐蝕的影響規(guī)律,并通過origin軟件繪制相應(yīng)的關(guān)系圖。然后通過Fluent軟件對(duì)流速及湍流狀態(tài)對(duì)環(huán)烷酸腐蝕的影響進(jìn)行模擬仿真呈現(xiàn)出理論模擬結(jié)果,同時(shí)也通過3D腐蝕形貌分析儀分析實(shí)驗(yàn)試樣在實(shí)驗(yàn)中所受到的實(shí)際影響結(jié)果。最后對(duì)這兩個(gè)結(jié)果進(jìn)行綜合對(duì)比分析得出流速及湍流狀態(tài)對(duì)環(huán)烷酸腐蝕的主要影響規(guī)律。本文主要結(jié)論如下:(1)對(duì)環(huán)烷酸腐蝕動(dòng)力學(xué)控制機(jī)制的分析表明環(huán)烷酸腐蝕速率主要受腐蝕反應(yīng)自身控制,反應(yīng)物、產(chǎn)物的傳質(zhì)及吸脫附過程不是環(huán)烷酸腐蝕的控制過程,理論分析表明腐蝕速率V與溫度T間符合Arrhenius公式。(2)API581及腐蝕實(shí)驗(yàn)的數(shù)據(jù)分析證明腐蝕速率V與溫度間確實(shí)符合lnV正比于(-1/T)的線性規(guī)律,與理論分析吻合,可應(yīng)用lnV正比于(-1/T)的線性規(guī)律來實(shí)現(xiàn)環(huán)烷酸腐蝕速率的預(yù)測。(3)高速流直噴沖擊下試樣表面湍流強(qiáng)度隨距離試樣中心的距離R增大而降低。在試樣中心附近存在最高湍流,強(qiáng)度數(shù)值約9.5%。同時(shí),湍流強(qiáng)度對(duì)局部的最大腐蝕深度及局部平均腐蝕深度有顯著影響,影響程度隨湍流強(qiáng)度的加大而增強(qiáng),在強(qiáng)湍流區(qū)試樣具有最高的腐蝕速率,強(qiáng)湍流區(qū)域的局部腐蝕深度為平均腐蝕深度的4倍以上。
[Abstract]:Naphthenic acid corrosion is one of the common corrosion forms in the process of refining crude oil with poor quality and is a problem to be solved urgently in the process of refining high acid crude oil. Although most of the high-acid crude oil refining enterprises have carried out equipment adaptation modification, process improvement, addition of corrosion inhibitor or mixing to reduce corrosion, the naphthenic acid corrosion is still serious in the region with high speed turbulence such as elbow, three-way, pump and so on. Therefore, the study of naphthenic acid corrosion law is of practical significance for the structural design, life prediction and long period safe operation of refinery units. In this paper, the naphthenic acid corrosion rate at different temperature and flow rate was measured by the naphthenic acid corrosion test at high temperature and high flow rate. Secondly, the influence of temperature on the corrosion of naphthenic acid is clarified through the analysis of corrosion test data, and the corresponding relationship diagram is drawn by origin software. Then the effects of flow rate and turbulence on naphthenic acid corrosion were simulated by fluent software, and the experimental results were analyzed by 3D corrosion morphology analyzer. Finally, the main effects of flow rate and turbulent state on naphthenic acid corrosion were analyzed and compared. The main conclusions are as follows: (1) the analysis of the mechanism of naphthenic acid corrosion kinetics shows that the corrosion rate of naphthenic acid is mainly controlled by the corrosion reaction itself, the mass transfer and desorption process of reactants and products is not the control process of naphthenic acid corrosion. The theoretical analysis shows that the corrosion rate V and temperature T conform to the Arrhenius formula. (2) the data analysis of API581 and corrosion experiment proves that the corrosion rate V and temperature really accord with the linear law of LNV proportional to (-1 / T), which is consistent with the theoretical analysis. The linear law of LNV proportional to (-1 / T) can be used to predict the corrosion rate of naphthenic acid. (3) the surface turbulence intensity decreases with the increase of distance R from the center of the sample. There is the highest turbulence near the center of the specimen, and the intensity is about 9.5%. At the same time, the turbulence intensity has a significant effect on the local maximum corrosion depth and the local average corrosion depth, and the influence degree increases with the increase of the turbulence intensity, and the sample has the highest corrosion rate in the strong turbulent zone. The local corrosion depth in the strong turbulent region is more than 4 times of the average corrosion depth.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE986

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