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输油管线硫化腐蚀研究
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摘要
近年来,随着我国进口及国内开采含硫原油的增多,输油管线腐蚀加剧,穿孔现象时有发生,管线使用寿命严重缩短。输油管线的硫化腐蚀研究有助于评估管线的使用寿命、减少能源浪费和环境污染,具有较高的研究价值。
     本论文模拟管输含硫原油的现场工况条件,实验室运用高温高压反应釜,辅以失重法,测定不同典型含硫原油在不同输送条件下的16Mn钢管材试样的腐蚀速率,建立输送不同酸值、不同含硫量原油在不同输送温度、不同输送压力、不同流速条件下的管线腐蚀速率数据库。通过扫描电子显微镜(SEM)对试样腐蚀形貌进行观察,通过X射线荧光光谱对试样表面腐蚀产物进行成分鉴定,通过电化学方法结合挂片失重法对不同状况下的腐蚀产物膜进行定性评价,对比分析不同条件下腐蚀产物膜的成膜情况,结合测定的管材腐蚀速率,揭示含硫原油对输油管线的腐蚀规律。研究表明:硫含量和酸值是影响输油管线内腐蚀的主要因素,温度和流速是次要因素,压力对管线的腐蚀速率影响不大;实验条件范围内,原油的硫含量越大,其腐蚀性越强;随着原油酸值的增大,管材的腐蚀速率明显增强;温度越高腐蚀产物膜对试样的保护作用越强,同时各种腐蚀性物质在腐蚀产物膜中的扩散速率也越大,后一种作用强于前一种作用,管材试样表现出温度越高,腐蚀速率越大的腐蚀规律;动态原油比静态原油具有更强的腐蚀性,在特定的流速下管材的腐蚀速率存在最大值。
     在管线腐蚀速率数据库基础之上,运用BP神经网络开发管线剩余寿命预测软件;根据管线的修建、运营等相关费用,计算输送含硫原油相应的管线腐蚀经济损失,并开发软件的相应功能。
In recent years, our country is increasing the import and intestine output of crude oil with high sulphur content year by year. The perforation phenomenons of pipeline occur frequently, and pipeline’s using life is cut down seriously. The sulphur corrosion research of oil pipeline contributes to assesse pipeline’s using life, decrease energy dissipation and environmental pollution, which has high research value.
     The high temperature high pressure reaction still was used in laboratory to simulate the scene operating mode condition. The corrosion rate of 16Mn pipe steel was measured in different typical sour crude oil under different transportation conditions. A corrosion rate database of pipeline was built when different kind of oil with different sulphur content and different acid number under different transportation temperature, different pressure and different speed of flow. The specimen surface appearance was observed through the scanning electronic microscope (SEM), and the ingredient of corrosion product on the test specimen surface was appraised through X-Ray Fluorescence Spectrometer(XRF). The qualitative analysis of corrosion product film was got through electro-chemical means and weight loss method in order to compare the corrosion product film under different situations. The pipeline’s corrosion disciplinarian was revealed combined with corrosion rate. The research shows that sulphur content and acid value was the main reasons of the internal corrosion, temperature and flow velocity was the secondary cause, and pressure had little influence on the corrosion rate; the more sulphur content was, the stronger the crude oil was within the limit of experimental condition; the pipeline’s corrosion rate increased obviously with the acid value increasing; the higher temperature was, the stronger corrosion product’s protectiveness became, and the bigger diffusion rate of all kinds of corrosive materials, and the latter effort fact was stronger than the former, so the pipeline’s corrosion rate increased with the temperature increasing; the dynamic crude oil had stronger corrosivity than static oil, and there was a maximum value according to certain flow velocity.
     On the base of the corrosion rate database, a predict software for the remaining lifetime of pipeline was programmed using BP neural network. The corresponding economic loss of transportation sour crude oil was calculated according to related expense about pipeline's construction, operation and so on. The economic loss computation function was also developed in the software.
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