Numerical Simulation Research On Cathodic Protection Parameters Of Long Distance Pipeline

In the process of oil and gas transportation,due to the influence of external soil characteristics and topographic subsidence,electrochemical corrosion occurs on the outer surface of the pipeline,causing perforation of the pipeline and causing oil and gas leakage.Although cathodic protection can effectively suppress electrochemical corrosion,it is difficult to detect cathodic protection potential for long-distance pipelines,which makes it difficult to evaluate cathodic protection effects,and is more challenging than regional cathodic protection such as station and storage tanks.Therefore,studying the potential distribution of the cathodic protection system for long-distance pipelines is essential for determining reasonable cathodic protection parameters and improving cathodic protection.Based on the knowledge of electrochemical corrosion,cathodic protection,numerical simulation technology and optimization algorithm,the potential distribution of the cathodic protection system of buried long-distance pipeline is studied as follows:(1)Establish a mathematical model of cathodic protection potential distribution,and use numerical simulation method to study the influence of different factors on the potential distribution of buried pipeline cathodic protection system;(2)Establish a cathodic protection anode configuration optimization model,and use the particle swarm optimization algorithm to optimize,combine the characteristics of the model,design the algorithm parameters,and obtain the optimal anode point coordinates through multiple iterations;(3)Based on the case of cathodic protection design of buried pipeline,the potential distribution curve of cathodic protection system is compared with traditional design and numerical sinulation.The feasibility of particle swarm optimization in anode configuration optimization is verified.These results show that the change of soil medium around the pipeline,the number of anodes and the change of buried depth will affect the cathodic protection potential distribution.Therefore,the design of cathodic protection needs to consider these variables.By optimizing the anode configuration,the pipeline surface is effectively improved.The uneven distribution of potential has a guiding significance for the design of the anode bed in the on-site cathodic protection system.