电阻探针腐蚀监测系统研制与实验研究

发布时间：2018-05-16 19:58

本文选题：电阻探针 + 金属腐蚀　；参考：《大连理工大学》2013年硕士论文

【摘要】：海底管道内壁腐蚀实时监测系统需要应用针对海底管道内壁腐蚀的传感器、高精度腐蚀监测装置以及无人值守的腐蚀监测软件。在本世纪海洋石油开发热潮的背景下,国外已有公司开发出针对海底管道内壁腐蚀实时监测技术产品,国内相应产品的监测方式和精度都不能满足工程实际需求。本文依托“国家重大科技专项——荔湾3-1气田腐蚀监测与防腐系统设计”子课题,开展电阻探针腐蚀实时监测系统的基础研究工作,为研制具有自主知识产权的海底管道内壁腐蚀实时监测系统打下坚实基础。最终期望实现工业化应用,实现远程、实时和在线监测海底油气管道内壁腐蚀状态。本文所做的主要工作分为以下几部分： (1)研究了基于温度补偿的电阻探针的原理,分析了温度对电阻探针腐蚀监测系统的影响。认为采用基于温度补偿原理的方法进行腐蚀实时监测,可以在一定程度上消除温度在腐蚀监测过程中的影响,并将此影响归结为温度对金属电阻率的影响。深入讨论了温度对电阻探针腐蚀监测系统单个测量周期内的影响,并将此影响归结为由于温度而产生的热电动势的影响,可以采用电流倒向原理对此影响进行补偿。 (2)分析了常用的U型电阻探针的不足,提出了一种新型的基于环状探针对的电阻探针,并制作了实际装置。 (3)研制了腐蚀监测装置(HMMS),开发了配套软件,实现腐蚀监测的自动化。HMMS包含高精度的数控恒流源等单元模块,创新地采用模拟开关解决腐蚀监测过程中待测元件多样化的问题。 (4)进行了电阻探针腐蚀监测系统的温度相关性实验、稳定性实验和加速腐蚀实验,采用了偏移补偿法和电流倒向法降低温度的影响,确定了本文所述系统的金属腐蚀深度监测分辨率达到0.1μm。
[Abstract]:The real-time monitoring system of submarine pipeline inner wall corrosion requires the application of sensors, high precision corrosion monitoring device and unattended corrosion monitoring software for submarine pipeline inner wall corrosion. Under the background of the offshore oil exploitation upsurge in this century, some foreign companies have developed real-time monitoring technology for the inner wall corrosion of submarine pipelines. The monitoring methods and precision of the domestic products can not meet the actual needs of engineering. Based on the sub-project of "corrosion monitoring and anticorrosion system design in Liwan 3-1 gas field, a major national science and technology project", the basic research work of resistance probe corrosion real-time monitoring system is carried out in this paper. It lays a solid foundation for the development of a real-time monitoring system for the inner wall corrosion of submarine pipelines with independent intellectual property rights. Finally, it is expected to realize industrial application, remote, real-time and on-line monitoring of corrosion status of submarine oil and gas pipeline inner wall. The main work of this paper is divided into the following parts: 1) the principle of resistance probe based on temperature compensation is studied, and the influence of temperature on the corrosion monitoring system of resistance probe is analyzed. It is considered that the method based on the principle of temperature compensation can eliminate the influence of temperature in the process of corrosion monitoring to a certain extent, and this effect can be attributed to the effect of temperature on the resistivity of metals. The effect of temperature on the temperature in a single measuring period of resistance probe corrosion monitoring system is discussed, and the effect is reduced to the influence of thermoelectromotive force caused by temperature. The effect can be compensated by the principle of reverse current. A new type of resistance probe based on annular probe pair is proposed and a practical device is made. (3) A corrosion monitoring device has been developed, and a complete set of software has been developed to realize the automation of corrosion monitoring. HMMS includes high precision numerical control constant current source and other unit modules. The analog switch is innovatively used to solve the problem of diversification of the components to be tested in the process of corrosion monitoring. The temperature dependence experiment, stability experiment and accelerated corrosion experiment of resistance probe corrosion monitoring system are carried out. The effect of temperature is reduced by offset compensation method and current backward method. It is determined that the metal corrosion depth monitoring resolution of the system in this paper is 0.1 渭 m.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：U178;P756.2

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