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Remote Monitoring System Design Of Buried Metal Pipeline

Posted on:2017-01-13Degree:MasterType:Thesis
Country:ChinaCandidate:C Y XiongFull Text:PDF
GTID:2311330488462361Subject:Instrumentation engineering
Abstract/Summary:PDF Full Text Request
Applied cathodic protection is the effective measure to prevent the buried pipe from corrosion, but the cathodic protection of buried metal pipeline has the following disadvantages. Due to the current technical conditions, the way people generally admitted to obtain parameters of periodic cathodic protection is artificial, not only time-consuming, laborious, and may lead to errors in measurement because the big intensity of labor. Cathodic protection potential in each season, each time period, due to the rainfall and changes in the environment nearby pipelines, on different position and different time the values of cathodic protection parameters are different, the traditional methods cannot achieve real-time monitoring of data. Therefore, to guarantee the buried metal in a protected state all the time, need to do the following two points: can carry on the real-time monitoring to the cathodic protection potential; can carry on the automated analysis on monitoring results and scientific management.This paper finished the remote monitoring system design of buried pipeline which is in service of zhejiangjiaxin. The system design mainly includes two parts: remote monitoring system design of cathodic protection parameters, remote monitoring system design of potentiostat. The remote monitoring system design of cathodic protection parameters improve work efficiency by providing real-time, accurate, specific and comprehensive monitoring data information for buried metal pipeline. It also designs acquisition scheme according the data of natural gas buried metal pipeline in different period of time by analyze and processing the data. It makes the monitoring more accurate, efficient and intelligent. Potentiostat parameter monitoring system can monitor the work condition of potentiostat. When the potential of buried metal pipeline is beyond the scope of cathodic protection, it can make the buried metal pipeline in a protected status by changing the working power of the potentiostat.Main research work in this paper is as follows.1. This paper design a power management module realized the requirement of low power consumption according to the problem of insufficient power supply condition when in the wild. Through the switch chip or alarm clock chip to control different circuit, only when the circuit is need to work then turn on a switch or alarm clock chip: The power management of the simulate circuit(+12V), in front of the power supply into the signal conditioning circuit use a switch chip IRF7416 to control the power; STM32 micro controller generally dormant, when need to work it awakened by the alarm clock chip DS1682.2. This paper use STM32F103V8CT6 as micro controller.3. SIM900 A GPRS wireless module is used to transmission the data of the cathodic protection and potentiostat parameters, the system transmitted to the monitoring center through GPRS wireless network after the data is packaged.4. The electric potential modulation circuit is designed according to the following situations.The buried metal pipeline is placed near high voltage transmission line or transformer, it will induced coupling frequency voltage on the pipe.In addition, due to the pipe buried in the ground, it will coupling strong induction lightning signals on the pipe when in the thunderstorm weather. As a result, the system will not be able to direct the pipeline and the reference electrode port connected to the measuring system until the port protection needs to be done.5. The communication potential modulation circuit is designed according the situation of the ac signal is coupled on the pipeline. The frequency of ac signal is normally 50 Hz, so the system selected AD736 as conversion chip because of low power consumption(less than 200?A), high input impedance(about 1012 ?), high frequency conversion(up to 36 KHZ). In a word, it satisfies the requirement of system design.6. The 4~20mAmodulation circuit of three-channel is designed because of that buried metal pipeline is placed near high voltage transmission line or transformer, it will induced coupling frequency voltage on the pipe.In addition, due to the pipe buried in the ground, it will coupling strong induction lightning signals on the pipe when in the thunderstorm weather.7. Micro controller unit is designed. It responsible for the coordination work of the system and the sampling of parameters of the cathodic protection(electric potential, power point, ac potential, the corrosion potential) and the potentiostat(output voltage, output current and electric potential).8. To parsing, analysis and processing the accept data and control the protection state of buried metal pipeline the monitoring center is designed. When finding abnormal data, the system will alarm and the management decision makers can immediately send relevant commands to the monitoring and control system through the server, the monitoring system make the buried metal pipeline in a protected state by controlling the power of the potentiostat.
Keywords/Search Tags:Natural Gas Buried Pipeline, Cathodic Protection, Potentiostat, Data Acquisition, Remote Monitoring
PDF Full Text Request
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